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Apple Computer Personal Computer IMAC DV, User's Manual

1. cr Troubleshooting Symptom Cure Tables System Problems After Startup 42 CD ROM or DVD ROM Not Showing on Desktop CD ROM and DVD ROM problems are defined by the inability to see the CD or DVD on the desktop or to open a CD or DVD that is loaded into the drive Possible Cause Possible Fix Bad CD ROM or DVD ROM disc Try using a known good compact disc CD ROM or DVD ROM disc didn t load properly Manually eject the disc and try again Push a paper clip through the manual eject hole located on the right side of the CD DVD slot Restart the iMac after the disc ejects Note The power must be on to eject a CD or DVD disc Corrupted system software If the CD ROM or DVD ROM drive fails to mount boot off the system CD that came with the unit Do you see the CD ROM or DVD ROM drive on the desktop now Yes Reinstall system software You must use the sys tem software CD that came with the unit to get the cor rect version of the Mac OS No Go to the next step Master Slave switch set incorrectly on the back of the CD ROM or DVD ROM drive Make certain the Master Slave switch located under the CD Adapter board on the drive is set to Slave The Slave position is the switch closest to the CD Adapter connector on the back of the CD ROM or DVD ROM drive The switch is set correctly at the drive vendor but it may have been moved by mistake Loose cable Check all cables running to an
2. er Take Apart Tools The following tools are recommended for procedures in this chapter phillips screwdriver 1 and 2 a stubby short phillips screwdriver plastic flatblade screwdriver to release tabs on plastic housing jeweler s screwdriver CRT discharge tool needlenose pliers ESD mat ej Take Apart Bottom Housing With Flip Foot 2 Procedures Bottom Housing With Flip Foot Before you begin position the computer face down resting the computer on an ESD mat or other soft surface ej Take Apart Bottom Housing With Flip Foot 3 WA Vented Door Bottom gt Housing Remove the two screws near the flip foot Using a plastic flatblade screwdriver pry the VGA vented cover off the bottom housing to access two more screws Note There are two service parts for the vented cover One cover has an opening for the video out port and the other cover does not Remove the video out access door from the bottom housing ej Take Apart Bottom Housing With Flip Foot 4 4 Remove the two outer screws located near the video out port Note The bottom housing uses two sizes of screws The two shorter screws attach near the flip foot Wide Out Port er Take Apart Bottom Housing With Flip Foot 5 5 Lift the bottom housing from the computer ej Take Apart Bottom Housing With Flip Foot 6 Bo tto m Ho using 6 Replacement Caution
3. Service Source iMac iMac DV iMac DV Special Edition gt Basic Navigation Within Service Source jee 00 a Find Search Service Service i Searches the current Searches across all Source Source document only Acrobat documents Main Menu Help Product Name When viewing Service Source Acrobat procedures with O Basics HHE bookmarks active the default setting you can click E chapter title to go directly ta that chapter You can also P D Specifications click the triangle to reveal and directly access b 0 Troubleshooti ng topics within the chapters Go to gt D Take Apart Next page b CI Parts when printing pages from Acrobat Go to use these numbers to specify the Previous page 0 Exploded View page range you wish to print 4 ps The page numbers at the top af procedure pages are relative to Indicates the each chapter not to the whole of sil gt document Indicates a topic that iz two or more pages l v n Service Source Basics iMac iMac DV iMac DV Special Edition 3 Basics Overview 1 Overview Product Description A completely new iMac redesigned from top to bottom inside and out and available in three new models iMac iMac DV and iMac DV Special Edition The computer offers several new unique features including translucent plastics wireless ready networking technology a VGA p
4. Position the computer face down Remove four screws and loosen the fixed screw at the top on the rear housing ej Take Apart Top Rear Housing 73 5 Position the computer j right side up Push down and pull out on the rear housing to unhook the Rear rear housing tabs that Ho using connect to the inner bezel g f T i d i D all Take Apart Top Rear Housing 74 6 Lift the top rear housing off the computer Divider Panel 75 ej Take Apart Divide r Pa nel Divider Panel Note The divider panel is only the metal chassis with EMI foam part number 922 4044 Many service parts such as the speakers power analog video board side panels cables and the headphone board are connected to the divider panel Remove the divider panel with the parts connected for easiest access to these service parts ej Take Apart Divider Panel 76 Divide r Panel Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin discharge the CRT rest the computer on an ESD mat and remove the following bottom housing front outer bezel top rear housing ej Take Apart Divider Panel 77 1 Disconnect the microphone connector located near the top of r the CRT 2 Disconnect the anode cap
5. Bad headphone board Replace the headphone board cr Troubleshooting Symptom Cure Tables System Problems After Startup 45 Sound In Problems Sound in problems involve the internal microphone Symptoms could be audio record ing quality is poor a high level of background noise is noticeable or no sound is recorded Possible Cause Possible Fix Sound control panel Open the Simple Sound Control Panel found under the Apple Menu Select CD Quality under the Sound menu to minimize noise on the internal microphone Did this solve the problem Yes If the initial sound in problem was with the sound control panel the problem is solved No Go to next step Loose audio cable Reseat the audio cable 922 4039 Bad audio cable Replace the audio cable 922 4039 Bad microphone Replace the internal microphone cr Troubleshooting Symptom Cure Tables System Problems After Startup 46 Noise From Computer After Shutdown After the computer is shutdown the computer emits a loud humming or buzzing noise that may continue for minutes or until the power cord is removed Possible Cause Possible Fix Logic Board Replace the logic board Troubleshooting Symptom Cure Tables System Problems After Startup 47 USB Problems USB problems refer to symptoms or issues that may occur with external USB devices that are attached to the iMac This could incl
6. Note Refer to Colored Service Parts Exploded View Exploded View Colored Service Parts Click part to go to parts database only in html version Top Rear Housing 922 3894 Tangerine 922 3895 Grape 922 3896 Blueberry 922 3897 Lime 922 3898 Strawberry 922 3920 Graphite Front Outer Bezel 922 3899 Tangerine 922 3900 Grape 922 3901 Blueberry 922 3902 Lime 922 3903 Strawberry 922 3921 Graphite Speaker L and R Kit 076 0806 Tangerine 076 0807 Grape 076 0808 Blueberry 076 0809 Lime 076 0810 Strawberry 076 0811 Graphite Bottom Housing W Flip Foot 922 3889 Tangerine 922 3890 Grape 922 3891 Blueberry 922 3892 Lime 922 3893 Strawberry 922 3919 Graphite RAM Access Door 922 3885 Tangerine 922 4135 Grape 922 4136 Blueberry 922 4137 Lime 922 4138 Strawberry 922 4139 Graphite Mouse 922 3969 Graphite 922 4072 Blueberry 922 4073 Tangerine 922 4074 Grape 922 4075 Strawberry 922 4076 Lime Keyboard 922 4077 Graphite 922 4078 Blueberry 922 4079 Tangerine 922 4080 Grape 922 4081 Strawberry 922 4082 Lime oj Exploded View 3 Cable Locator Click part to go to parts database only in html version Cable Analog P503 Cable Analog P504 to Video Board P303 16 pin to Video Board P304 10 pin 922 4037 922 4035 Cable Audio Headphones Speakers Microphone LED Power Supply 922 4039 RGB Cable 922 4034 Hard Drive
7. 1 Remove the two tabs screw caps on the top inner bezel Refer to the next page for a close up of the tab removal Inner Bezel er Take Apart Top Rear Housing 71 2 Pry the tabs off and remove the two screws under each tab Rear using Top Rear Housing 72 ej Take Apart Position the computer face down Remove four screws and loosen the fixed screw at the top on the rear housing Top Rear Housing 73 er Take Apart Rear Ho using Position the computer right side up Push down and pull out on the rear housing to unhook the rear housing tabs that connect to the inner bezel Ic Take Apart Top Rear Housing 74 im 6 Lift the top rear housing off the computer Divider Panel 75 ej Take Apart Divide r Panel Divider Panel Note The divider panel is only the metal chassis with EMI foam part number 922 4044 Many service parts such as the speakers power analog video board side panels cables and the headphone board are connected to the divider panel Remove the divider panel with the parts connected for easiest access to these service parts Divider Panel 76 ej Take Apart Divide r Panel Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin discharge the CRT rest the computer on
8. 7 Partially lift the side i Divide r panels with the power Panel analog video board i Metal attached to the divider panel up and off the inner bezel to gain access to connector P501 on the power analog video board PSO1 Located at Bottom af Powe ra nalag Bo ard Side nel ej Take Apart Divider Panel 81 Power Analog 4 Video Board PFO o Disconnect P501 and P701 on the power analog video board The cables are located near the high voltage capacitor ej Take Apart Divider Panel 82 9 Onthe other side of the CRT neck disconnect the brown degauss cable P901 from the power analog video board 10 Remove P901 from the cable clamp Cable Power Analog Fed Clamp Video Boar ej Take Apart Divider Panel 83 11 At the very bottom of the power analog video board near the bottom of the CRT disconnect T P902 which is part of wA 4 fae 1 the audio headphone zia i X LED speaker cable assembly er Take Apart Divider Panel 84 Video Board Ground Cables 12 Disconnect the two black ground cables going to the video board Caution Be careful when working around the CRT neck rings If the neck rings are bumped the CRT will be knocked out of adjustment and will require replacement of the CRT ej Take Apart Divider Panel 85 13 Loosen the CRT neck Vide
9. er Take Apart Logic Board 45 Identifying 350 MHz Logic Boards 661 2210 There are two 350 MHz logic boards in service stock under the part number 661 2210 One board has an expansion board daughterboard and the other does not have the expansion board Note The boards are completely interchangeable The 350 MHz iMac Slot Loading computer originally came with an expansion board daughterboard on the logic board that provided Ethernet functionality More recent iMac Slot Loading computers and logic board service parts may ship without this expansion board daughterboard The Ethernet functionality has been incorporated onto the logic board making the expansion board unnecessary The part number for the logic board 661 2210 did not change and boards with or without the expansion board are interchangeable Refer to TIL article 58564 for additional information er Take Apart Logic Board 46 Identifying the Version 2 350 MHz Logic Board 350 MHz Logic Board o The Version 2 board and dE Pd the more recent 661 2210 logic board without the daughterboard look identical apart from the revision number on the VLSI chip Refer to the next page for a close up of the VLSI chip on the Version 2 board VLSI Chip e Take Apart 350 MHz Logic Board e VY22099g a 34350339 09 Revision Apple Laas Number CAN Logic Board 47 The Version 2 board 661 2317 w
10. 1 Screw Disconnect the cable at J12 going from the logic board to the I O panel Remove the two screws on the I O panel ej Take Apart I O Panel 62 3 Turn the logic board over and remove the modem screw ej Take Apart I O Panel 63 D Panel Rotate the logic board face up again and carefully slide the I O panel off the logic board Note As you slide the 1 O panel off the logic board support the modem with your hand so the modem doesn t fall off the logic board ej Take Apart Front Outer Bezel 64 Outer Bezel Front Outer Bezel Before you begin place the computer on an ESD mat and remove the bottom housing ej Take Apart Front Outer Bezel 65 Outer Bezel With a jeweler s screwdriver carefully remove the two tabs on the front outer bezel Refer to the next graphic for a close up of the tab removal ej Take Apart Front Outer Bezel 66 2 After removing the tabs Tab remove the screws located under the tabs Outer Bezel Front Outer Bezel 67 ej Take Apart Outer Bezel Note The bezel tabs fit tightly into the rear housing A good hard pull upward is required to release all the tabs 3 Insert a plastic tool underneath the bezel Pry the outer bezel tabs from the rear housing with a plastic tool As you push and pry the tool inside the bezel the side tabs will start to release Insert the
11. 16 I O Panel with FireWire Sound FireWire Int amp rmal USB Input Pers Modem Ports Ethernet Port 2 Pot 2 Part Output Programmer s Button PE ej Basics Views 17 I O Panel without FireWire Sound Intarnal USB Input Medem Ports Ethernet Part Part 2 Port Reset Programmer s Output aten ej Basics Views 18 iMac Logic Board Wireless Adapter Guides AirPort CD HE Adapter Cable Card Connector Connector Management pe Reset Button z SD RAMH DIMM Slots Modam Is on the Underside of the Connector Logic Board ta Down Can verter poar Battery Grahpics ATI Chip Video Qut Port Main Processor if Present On Underside of Board Repair Strategy Warranty 19 er Basics Repair Strategy Warranty Strategy and Ordering The iMac 350 MHz iMac DV and iMac DV Special Edition includes a 1 year complimentary carry in warranty Service the computer through module exchange and parts replacement Customers can request on site service from an Apple Authorized Service Provider Plus AASP Apple Assurance US only or Apple Canada Technical Answerline Cananda only Apple service providers planning to support the computer systems covered in this manual may purchase Service modules and parts to develop servicing capability To order parts use the AppleOrder U S only or ARIS Canada only system and refer to th
12. Jumper Adjustment Tool The jumper adjustment tool 922 4165 must be installed to save cutoff and white balance adjustments to the factory space Continue with the procedures for instructions on installing the jumper Adjustments Adjustment Tools 7 Awarning This product Video Board contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety 1 Remove the bottom housing and the top rear housing to access the video board Adjustments Adjustment Tools 8 2 With the power off remove the left ground cable from the video board Video Board ej Adjustments Adjustment Tools 9 3 Connect one end of the jumper adjustment tool 922 4165 to the video board pin 4 Connect the other end to one of the ground pins 5 Power on the iMac and begin the adjustments Jumper Adjustment Tool 17 V SL Sw ll ban er Adjustments Focus Adjustment 10 Fh back Transformer Focus Adjustment Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety 1 Remove the bottom housing and the top rear housing to access the focus potentiometer on the flyback transformer Note Make sure the jumper adjustment tool is installed see previous procedure 5 Adjustments Focus Adjustment 11 Gray Bars Black White Red
13. Power Cable 922 4030 NMI Reset Cable FireWire 922 4031 External Cable 922 3884 renti HD CD DVD Cable Cable Modem 922 4029 Phone 1TP ICE 922 3963 oj Exploded View 4 Screw Matrix Screws Locator 922 4144 I 4 CD HD Carrier to Divider Panel 922 4145 i 4 CD DVD Carrier CD to Drive to Carrier te 3 922 4146 CD Adapter Board 2 4 922 4147 HD to HD Carrier 4 88 5 922 4148 I O Panel 2 Main Logic Board 1 6 922 4149 EMI Cover 6 re 922 4150 Antenna Clip 1 Down Converter Board 2 a in front of Down Converter Heat sink 922 4151 Inner Bezel amp Side Panels to Divider Panel 4 iL 044 dod d ipd 922 4152 Screws Top Rear Housing 2 Bottom Housing near VGA Port Side Panels 2ea R amp L to Inner Bezel sides of CRT Terr rr 922 4153 Front Outer Bezel 2 to Inner Bezel under front caps Row 922 4154 CRT to Inner 4 922 4155 2 Main Logic Board 6 y Down Converter 4 Analog Board 6 Modem 1 922 4157 Mince Audio Cable 2 to Divider Panel amp RGB Cable 2 on Pwr AnalogBoard ej Exploded View 5 Identifying 350 MHz Logic Boards There are currently three 350 MHz logic boards in service stock for the slot loading iMac Two of the logic boards are under the same part number 661 2210 refer to TIL article 58564 or the Service Parts database for additional in
14. To prevent serious injury review CRT safety in Bulletins Safety Before you begin discharge the CRT rest the computer on an ESD mat or other soft surface and remove the following bottom housing front outer bezel top rear housing divider panel assembly CRT 123 lol Take Apart 1 Remove the four CRT screws and the ground wire 2 Lift the CRT from the inner bezel Caution Be careful when working around the CRT neck rings If the neck rings are bumped the CRT will be knocked out of adjustment and will require replacement of the CRT Microphone 124 ej Take Apart Microphone Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin discharge the CRT rest the computer on an ESD mat or other soft surface and remove the following bottom housing front outer bezel top rear housing ej Take Apart Microphone 125 1 Disconnect the Mico pho ne Connector microphone connector M mh el pm If you can t access the js micropone connector unwrap the bendable degauss cable wrap 2 Pull the microphone from the inner bezel H e Take Apart Microphone 126 Replacing the Microphone 1 Insert the microphone into the inner bezel with the loop facing down toward the CRT Push the microphone through the hole on the
15. voltage should measure approximately 1 2 volts with the power cord plug plugged in The voltage will jump to 21 volts after pow ering on the system A reading of 1 2 volts up to 1 volt indi cates the logic board is OK Without a reading of 1 2 volts verify the fuse at F901 is OK refer to Testing the Power Analog Board Fuse in this section If the fuse is OK replace the power analog video board Logie Board sf A p 2 M dun m f 2 m wd aA TE P a MMMRAU w ar Testing DCO Voltages at C10 on the Logic Board oi Troubleshooting Testing for Power 7 Testing J7 for Voltage on the Logic Board The following voltages measure if the down converter is providing the required voltages and are only present if the system is pow ered on If the following voltages are not correct refer to the No Power troubleshooting symptom chart Measure the following voltages at J7 on the logic board 1 Pin 2 12 volts 2 Pin 4 5 volts 3 Pin 14 3 3 volts Down Converter Testing Voltages at J7 on the Logic Board oi Troubleshooting Testing for Power 8 Testing the Power Analog Board Fuse First remove the bottom housing front outer bezel and the top rear housing to access the power analog board The fuse is located near the AC plug Warning You must unplug the iMac to do a continuity test at the power supply board fuse You will need an ohm meter to do a co
16. 5 V Trickle Power on the Logic Board mentioned earlier in this chapter Trickle power is present as soon as the power cord is plugged into the computer Did you measure 5 V trickle power on pin 1 of connector J9 Yes Go to the next step No Replace the power analog video board Bad down converter board Check for DCO voltage at location C10 on the logic board Refer to Testing DCO Down Converter On Voltage at C10 on the Logic Board mentioned earlier in this chapter Did you measure approximately 1 2 volts Yes Go on to the next step No Replace the down converter board Bad LED Power Switch Replace the LED power switch board 922 4160 Board If that doesn t solve the problem go on to the next step Bad CRT Replace the CRT cr Troubleshooting Symptom Cure Tables Startup Problems Before the Finder Appears No Video or Unstable Raster Normal startup boot chime the LED is on and the hard drive starts up The display however is solid gray Possible Cause Possible Fix Corrupted PRAM Reset parameter RAM Hold down Command Option P R during startup before Welcome to Macin tosh appears Corrupted system soft Boot off the system CD that came with the unit Do you ware See a normal screen display now Yes Reinstall system software You must use the system software CD that came with the unit to get the correct version of Mac OS No Go to
17. Apart Front Outer Bezel 66 2 After removing the tabs Tab remove the screws located under the tabs Outer Bezel Front Outer Bezel 67 ej Take Apart Outer Bezel Note The bezel tabs fit tightly into the rear housing A good hard pull upward is required to release all the tabs 3 Insert a plastic tool underneath the bezel Pry the outer bezel tabs from the rear housing with a plastic tool As you push and pry the tool inside the bezel the side tabs will start to release Insert the tool on the left side of the bezel and repeat e Take Apart Front Outer Bezel 68 As the tabs start to release pull hard on the front outer bezel to release the tabs completely Top Rear Housing 69 er Take Apart Top Rear Housing Top Rear Housing Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin rest the computer on an ESD mat and remove the following bottom housing front outer bezel er Take Apart Top Rear Housing 70 1 Remove the two tabs screw caps on the top inner bezel Refer to the next page for a close up of the tab removal _1 Bezel ej Take Apart Top Rear Housing 71 2 Pry the tabs off and remove the two screws under each tab Rear using Top Rear Housing 72 ej Take Apart
18. CD HD En ard En ard Panel Drove Carmer Take Apart Divider Panel 89 17 This is the divider panel service part number 922 4044 Power Analog Video Board 90 ej Take Apart Power nag Video Board Power Analog Video Board Before you begin discharge the CRT rest the computer on an ESD mat or other soft surface and remove the following bottom housing front outer bezel top rear housing Note There is a new power analog video board part number 661 2315 Rev 2 Refer to Identifying the Rev 2 Power Analog Video Board in this section ej Take Apart Power Analog Video Board 91 Warning This product Mico pho ne Connector contains high voltage and a Degauss high vacuum picture tube Cabk Wrap To prevent serious injury discharge the CRT 1 Disconnect the microphone connector located near the top of the CRT 2 Disconnect the anode cap 3 Unwrap the bendable degauss cable wraps in the upper left and upper right corners of the CRT ej Take Apart Power Analog Video Board 92 4 Liftthe degauss cable out of the way to access the side panel screws Using a narrow shaft screwdriver remove two screws on each side that attach the side panels to the inner bezel Note Don t remove the CRT screws in the four corners ej Take Apart Power Analog Video Board 93 6 Partially lift the side panels up to gain access Divider Pa
19. Clamp Video Boar ej Take Apart Power Analog Video Board 97 10 At the very bottom of the power analog video board near the bottom of the CRT disconnect T P902 which is part of wA 4 fae 1 the audio headphone zia i X LED speaker cable assembly er Take Apart Power Analog Video Board 98 Video Board Ground Cables 11 Disconnect the two ground cables on the video board Caution Be careful when working around the CRT neck rings If the neck rings are bumped the CRT will be knocked out of adjustment and will require replacement of the CRT ej Take Apart Power Analog Video Board 99 12 Loosen the CRT neck Video Board clamp screw CRT Weck Screw y Take Apart Power Analog Video Board 100 13 Carefully pull the video video Board board off the CRT neck ej Take Apart Power Analog Video Board 101 14 Holding on to the side panels lift the power analog video board from Side Panel the inner bezel ej Take Apart Power Analog Video Board 102 Power Board 15 Remove the ten screws Be and pinch the two standoffs to lift the power analog board off the divider panel ej Take Apart Power Analog Video Board 103 16 Lift the board up and out Power nalog Video Boar off the divider panel lifting the board toward the speakers Replacement Note If y
20. Left Right Assembly Top Rear Housing 922 4142 922 4143 Northern f 922 3896 Internal Microphone id cL j Bottom Housing 922 4038 W Flip Foot Inner Bezel P 922 3891 922 3888 E 4 VGA Vented Front Outer Bezel Cover 922 3901 Cap 2 Left 7 fo SS RAM Access Front Screw Cap 922 4140 EL 922 4136 is P Power Analog Video Board 661 2212 661 2315 Rev 2 Left Side Clip Metal Wireless Antenna Panel B I 922 4159 922 4042 in Wireless Antenna 922 3905 Left amp Right Kit Bracket Rear 922 4083 Headphone Modem Panel 922 4044 Board 922 4225 661 2213 LED Power Board 922 4160 Logic Board 661 2210 350 MHz 661 2317 350 MHz Ver 2 661 2211 400 MHz CD DVD Adapter Board 661 2316 400 MHz Ver 2 922 4027 I O Panel W FireWire CD ROM Drive V 922 4032 W O FireWire 922 4033 Battery Lithium 3 6 V 922 4028 SDRAM DIMM WF o 661 2145 64 MB 168 pin Right Side 661 2146 128 MB 168 pin Panel 922 4043 AirPort Card Optional 661 2219 661 2224 Slot Loading 24x DVD ROM Drive 661 2225 Slot Loading 4 24x HD CD DVD Data Cable 922 4029 CD ROM DVD ROM X WV Carrier 922 4041 c Hard Drive Power Cable 922 4030 Hard Drive I 661 2228 6 661 2248 10 GB _ a e 661 2252 13 GB HD CD DVD Carrier 922 4040 Adapter Card 076 0804 EMI Cover 922 3887
21. Rev 2 Analog Board There is a new power analog video board part number 661 2315 Rev 2 that has a switch at SW901 that must be set for the type of the CRT LG Samsung or CPT tube in the computer If the Rev 2 power analog video board or the CRT are replaced make sure to set the switch to the appropriate position One way to quickly identify an LG e Take Apart CRT 128 CRT is by the black sticker located on the left side of the CRT The sticker covers the LG label In this situation the 661 2315 Rev 2 analog board would have switch SW901 Black Sticker set to position 2 3 as shown Covering on the previous page LG Label Li CRT Microphone 129 ej Take Apart Microphone Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin discharge the CRT rest the computer on an ESD mat or other soft surface and remove the following bottom housing front outer bezel top rear housing ej Take Apart Microphone 130 1 Disconnect the Mico pho ne Connector microphone connector M mh el pm If you can t access the js micropone connector unwrap the bendable degauss cable wrap 2 Pull the microphone from the inner bezel H e Take Apart Microphone 131 Replacing the Microphone 1 Insert the microphone into the inner
22. Voltage Setup 17 ej Adjustments O Display Adjustment Utility Red Drive Green Drive Blue Drive Red Cutoff Green Cutoff Blue Cutoff Contrast Brightness Open the Display Adjustment Utility and select the Color tab Set the Contrast to maximum and the Brightness to midrange Set the resolution to 800 x 600 in the Monitors control panel er Adjustments Screen Voltage Setup 18 8 Select the Gray Bars test pattern from the Pattern site Help menu Gray Bars Black White Red Green Blue White Grid Black Grid Focus e im Adjustments Screen Voltage Setup 19 Looking at the Gray Bar test pattern turn the screen voltage knob on the flyback transformer until the first bar is black the second bar is barely visible the third bar is a dark gray Note The surrounding raster should also be black 10 When the requirements in step 10 are met the screen voltage is set correctly Proceed to the cutoff adjustment er Adjustments Cutoff Adjustment 20 Cutoff Adjustment Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Perform the cutoff adjustment whenever you replace the CRT or the power analog video board prior to the white balance adjustment in a dimly lit room er Adjustments Cutof
23. an ESD mat and remove the following e bottom housing e front outer bezel e top rear housing Divider Panel 77 ej Take Apart Degauss Wrap Mic pho ne Connector Disconnect the microphone connector located near the top of the CRT Disconnect the anode cap Unwrap the bendable degauss cable wraps in the upper left and upper right corners of the CRT Take Apart Divider Panel 78 Inne r Bez el Side Panel Lift the degauss cable out of the way to access the side panel screws Using a narrow shaft screwdriver remove the four side panel Screws two on each side ej Take Apart Divider Panel 79 6 Open the CRT cable clamps Remove the wires from the cable clamps z P m Cabe ERIS ej Take Apart Divider Panel 80 7 Partially lift the side panels with the power Divide r Panel analog video board Meta attached to the divider panel up and off the Ac inner bezel to gain AY access to connector P501 on the power F501 Located analog video board at Bottom of Powe r h nalog Bo ard ej Take Apart Divider Panel 81 8 Disconnect P501 and P701 on the power Power i ag analog video board The Baaai cables are located near the high voltage P701 capacitor ej Take Apart Divider Panel 82 9 Onthe other side of the CRT neck disconnect the brown degauss cable P9
24. ej Take Apart Divide r Pa nel Divider Panel Note The divider panel is only the metal chassis with EMI foam part number 922 4044 Many service parts such as the speakers power analog video board side panels cables and the headphone board are connected to the divider panel Remove the divider panel with the parts connected for easiest access to these service parts ej Take Apart Divider Panel 76 Divide r Panel Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin discharge the CRT rest the computer on an ESD mat and remove the following bottom housing front outer bezel top rear housing ej Take Apart Divider Panel 77 1 Disconnect the microphone connector located near the top of r the CRT 2 Disconnect the anode cap Mic in pho ne Connector De gauss m Wrap 3 Unwrap the bendable degauss cable wraps in the upper left and upper right corners of the CRT Divider Panel 78 ej Take Apart Lift the degauss cable out of the way to access the side panel screws Using a narrow shaft screwdriver remove the four side panel screws two on each side Divider Panel 79 ej Take Apart Open the CRT cable clamps Remove the wires from the cable clamps ej Take Apart Divider Panel 80
25. from either the front power button or the keyboard Possible Cause Possible Fix Improperly aligned front If the front power on LED is not centered properly power on button within the inner button hole the power button can become stuck between the LED and the inner bezel resulting in a no power intermittent shut down or sleep situation Refer the LED Alignment procedure in the Adjustments chapter or to TIL article 58622 for steps to resolve the LED alignment issue cr Troubleshooting Symptom Cure Tables System Problems After Startup 36 Memory Error Dialog If you see a error dialog message pertaining to memory after you have a successful startup sequence that is a normal boot tone with no error beeps and proper video display etc then refer to the table below to troubleshoot the problem Possible Cause Possible Fix Dialog message reads The Run Mac TestPro to locate the bad SDRAM Replace the built in memory test has SDRAM with a known good PC 100 SDRAM DIMM detected a problem Please contact a service provider for assistance cr Troubleshooting Symptom Cure Tables System Problems After Startup 37 Can t Wake From Sleep The computer cannot be brought out of sleep mode by pressing a key on the key board The problem is usually evident by a black screen and a pulsing amber LED Possible Cause Possible Fix PMU Press the PMU chip on the logic board with the AC
26. inner bezel see photo on the next page Inner Beze Microphone 127 Check that the microphone protrudes through the inner bezel hole e Adjustments LED Alignment Procedure 55 7 Replace the bottom Bottom Ho using housing making sure to align the tabs on the front 8 Ifthe button continues to stick after the LED has been properly aligned you may have to lightly sand the inner bezel Sand the area surrounding the inner button to reduce the contact between the inner button and inner bezel If necessary proceed to the next topic Inner Bezel Sanding ej Adjustments LED Alignment Procedure 56 Inner Bezel Sanding 1 Remove the inner power button so that the LED is exposed as shown in the graphic 2 Using a 180 grit or higher Silicon Carbide wet dry sandpaper lightly sand the edge of the lower section of the button recess indicated by the red arrows Sand the edge until you have removed any sharp edges on the outside of the button recess The goal is to ensure that there is a er Adjustments LED Alignment Procedure 57 slight uniform radius around the entire edge of the button recess 3 Clean out the inner button recess making sure to remove any debris that may have deposited during the sanding process 4 Reinstall the inner button and spring Reimbursement Procedure To get reimbursed for this procedure fill out a Service Repair Order and enter th
27. installed or from the clear antenna holder located near the SDRAM DIMMs Antenna 114 er Take Apart bottom housing front outer bezel top rear housing divider panel assembly ej Take Apart Antenna 115 1 Remove the three screws and cable clip on the antenna 558009 Antenna lie EE lt a E _ 5 a LETS pesoe _ Antenna 116 ej Take Apart Right Side Panel 4 Antenna Board and Cable uw NEU 3 Important Note how the antenna wire is routed through the side panel before removing A close up view of the right panel antenna is shown here Carefully remove the antenna from the right side panel ej Take Apart Antenna 117 3 Carefully remove the antenna from the left side panel Antenna Boar and Cab Antenna 118 ej Take Apart 4 Before removing the antenna from the divider panel mark the hole with a pen tip that the antenna passes through So you know which hole the antenna goes into when replacing the antenna Lift the antenna board from the divider panel Replacement Note Improper antenna routing in the side panels may cause wireless reception problems ej Take Apart Speakers 119 Left Speaker Fight Speaker Speakers Before you begin rest the computer on an ESD mat or other soft surface and remove the bottom housing The EMI coveris removed in this photo but it is not
28. mounted then a dialog box appears Powered Off iMac powers on Sleeping iMac wakes from sleep Table 2 Keyboard Button Functionality Pressing the Keyboard Button When the iMac is Result Powered On A dialog box appears to choose sleep or shutdown Powered Off iMac powers on Sleeping iMac wakes from sleep cr Troubleshooting Logic Board Battery 13 Logic Board Battery Important Apple highly recommends removing the battery when handling the logic board Make sure to use proper ESD protection when handling modules The battery on the logic board controls the stored system settings such as date and time It is only necessary to test the battery when you can t power on the computer or the date and time are reset every time the AC power is removed The battery is also used to power the PMU chip because the PMU chip keeps time and must always be running when the computer is unplugged from the wall AC power The PMU is very sensitive and touching any circuitry that is connected to the PMU can cause it to crash If the PMU crashes the battery life goes from about five years to about two days if the PMU is not reset Once the bat tery goes dead the PMU will reset the time and date to 12 00 AM 1 1 04 every time the AC power is removed To fix this situa tion replace the battery and reset the PMU refer to Resetting the PMU on the Logic Board mentioned earlier in thi
29. nel to connectors P501 and N Meta P701 located near the bottom of the power Ac analog video board see AY next graphic PSO Located at Bottom af Powe r h nalog Bo ard ej Take Apart Power Analog Video Board 94 7 Disconnect P501 and P701 on the power Power i ag analog video board The Baaai cables are located near the high voltage P701 capacitor ej Take Apart Power Analog Video Board 95 8 On the other side of the CRT neck disconnect P901 the brown cable from the power analog video board 9 Remove P901 from the cable clamp Cable Power Analog Clamp Video Boar ej Take Apart Power Analog Video Board 96 10 At the very bottom of the E u power analog video board near the bottom of Ge Power Analog the CRT disconnect Video P902 Board Power Analog Video Board 97 11 Disconnect the two Video Board ground cables from the video board Caution Be careful when working around the CRT neck rings If the neck rings are bumped the CRT will be knocked out of adjustment Ground Cables ant and will require 1 m m replacement of the CRT ej Take Apart Power Analog Video Board 98 12 Loosen the CRT neck Video Board clamp screw CRT Weck Screw Take Apart Power Analog Video Board 99 13 Carefully pull the video video Board boa
30. next step The PMU chip or logic Press the PMU chip on the logic board with the AC board needs to be reset power cord disconnected See The PMU Chip and Resetting the PMU on the Logic Board mentioned earlier in this chapter Connect the power cord and power on the system again Do you have power to the system now Yes Test the unit with MacTest Pro and return the computer to the customer No Plug in the AC power cord and reset the PMU chip again Do you have power to the system now Yes The battery is likely bad check the battery No Go to the next step Bad video cable connection Verify that the CRT video board cables the RGB cable and P701 the deflection yoke cable on the power analog board are securely attached If the problem persists go on to the next step Bent CRT neck pins Remove the CRT video board Check that the pins on the CRT neck are not bent Carefully reseat the CRT video board and power on the computer Do you have video now Yes Run MacTest Pro and return the computer to the customer No Go on to the next step cr Troubleshooting Symptom Cure Tables Startup Problems Before the Finder Appears Normal startup boot chime the LED is on and the hard drive starts up The display however is solid gray Possible Cause Possible Fix Bad power analog video Check for trickle power on the logic board Refer to board Testing J9 for 5 V Trickle Power
31. on a soft clean cloth or ESD mat 16 Upgrades f the VGA port is covered you can t see it replace the vented cover with the VGA Vented Cover Vented Cover VGA vented cover that came with the computer 17 09909 0209000209 00000000500 09706260 e 05052 O60 0900009 09 o 07709909 Vented Cover 11 Insert the flatblade screwdriver partially into the slot on the top of the vented cover then gently push forward on the screwdriver to pry the cover off 18 12 Insert the lower edge of the VGA vented cover into o cS a S o o cco c 23 o u 9 09 oa S r o oo VGA Vented Cove 19 13 VGA VGA Vented Cover External Monitor Cable 14 15 Plug the external monitor cable into the VGA output port on the back of the computer Plug the monitor cable into the monitor port on the external monitor Plug the power cord in and press the Power button on the computer to turn it on Press the Power button on the external monitor to turn it on Service Source Exploded View iMac iMac DV iMac DV Special Edition c Exploded View 1 iMac iMac DV iMac Special Edition Exploded View Click part to go to parts database only in html version Screw Cap ScrewCap CRT Top
32. power cord disconnected See The PMU Chip and Resetting the PMU on the Logic Board mentioned earlier in this chapter Connect the power cord and power on the system again Do you have power to the system now Yes Test the unit with MacTest Pro and return the computer to the customer No Plug in the AC power cord and reset the PMU chip again Do you have power to the system now Yes The battery is likely bad check the battery No Go to the next step Bad keyboard Try a known good keyboard Corrupted PRAM Reset the PRAM by holding down the Option Command P and R keys Software Conflict Reinstall System Software You must use the system software that came with the unit in order to get the correct version of Mac OS Note If the computer sleeps while connected to the Internet and is running Mac OS 8 6 or Mac Os 9 0 download Apple Audio Update 1 3 from the Apple Software Update page Bad logic board Replace the logic board lol Troubleshooting Symptom Cure Tables System Problems After Startup 38 Network Problems Refer to this troubleshooting table if you are unable to switch to the Ethernet network option in the control panel or if you are unable to see any network devices Note if you are able to see most network devices but one particular device does not show up in the Chooser troubleshoot the device in question You most likely do not have a net work problem Possible Cause Po
33. the sides a bit and then lift the side panels up and off the computer ej Take Apart Side Panels 109 6 Carefully remove the antenna wire from each side panel Right Side Panel 7 Pull the side panel off the metal divider panel If necessary repeat these steps for the other side panel ej Take Apart Antenna 110 Antenna Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin rest the computer on an ESD mat or other soft surface and remove the following antenna from the AirPort Card if installed or from the clear antenna holder located near the SDRAM DIMMs Antenna 111 er Take Apart bottom housing front outer bezel top rear housing divider panel assembly ej Take Apart Antenna 112 1 Remove the three screws and cable clip on the antenna 558009 Antenna lie EE lt a E _ 5 a LETS pesoe _ Antenna 113 ej Take Apart Right Side Panel 4 Antenna Board and Cable uw NEU 3 Important Note how the antenna wire is routed through the side panel before removing A close up view of the right panel antenna is shown here Carefully remove the antenna from the right side panel ej Take Apart Antenna 114 3 Carefully remove the antenna from the left side panel Antenna Boar and C
34. unit directly below the display external speakers connected via the I O panel to the speaker connector on the logic board or both Possible Cause Possible Fix Control Panel setting is First disconnect any external microphones speakers or incorrect headphones Next verify that volume setting in Control Panel is adequate and that mute is not checked Test the for sound coming from the internal speakers Do you have sound now Yes If the initial sound out problem was with the internal speakers the problem is solved If you reconnect the external sound out device and it is not working the problem may be with the external device itself or its cable Replace the external microphone speaker or headphone in question with a known good device If the problem persists replace the logic board No Go to next step Corrupted PRAM Reset parameter RAM Hold down Command Option P lt R gt during startup but before Welcome to Macin tosh appears Loose speaker connection Verify that both ends of the internal speaker cables are attached securely Loose audio cable Reseat the audio cable 922 4039 located on the divider panel under the CRT Bad audio cable Replace the audio cable 922 4039 Bad speakers Replace the speakers Bad logic board Plug known good headphones or external speakers into the external jack Do you get sound Yes Go to next step No Replace the logic board
35. 01 from the power analog video board 10 Remove P901 from the cable clamp Cable Power Analog ELE Clamp Video Boar ej Take Apart Divider Panel 83 11 At the very bottom of the u power analog video bow i board near the bottom of e Power Analog the CRT disconnect Video P902 which is part of Board the audio headphone LED speaker cable assembly ro Take Apart Divider Panel 84 12 Disconnect the two black Video Board ground cables going to the video board Caution Be careful when working around the CRT neck rings If the neck rings are bumped the CRT will be knocked out of adjustment Ground Cables and will require e 2 M ms so i x replacement of the CRT ej Take Apart Divider Panel 85 13 Loosen the CRT neck Video Board clamp screw CRT Weck Screw ej Take Apart Divider Panel 86 14 Carefully pull the video Video Board board off the CRT neck Divider Panel 87 ej Take Apart SN Divider 15 Lift and remove the entire divider panel assembly off the inner bezel Note Continue with the Take Apart procedure to remove the service parts from the divider panel ej Take Apart Divider Panel 88 16 Remove the following Powe nalog parts to replace the tL Degauss Video Board RP divider panel shown on Side the next page L Speaker T e Powe r LED Head phone Divider
36. Align the three tabs on the bottom housing with the tab slots on the front outer bezel Ensure that the center tab is properly aligned or CDs and DVD discs may not eject from the Slot Lower the bottom housing into place and replace the screws EMI Cover 7 ej Take Apart EFI Caver EMI Cover Before you begin Position the computer upside down resting the computer on an ESD mat or other soft surface Remove the bottom housing ej Take Apart EMI Cover 8 EMI Caver 1 Remove the six screws ld on the EMI cover ej Take Apart EMI Cover 9 2 Liftthe EMI cover off the computer Note Be careful of the VGA output port if present 4 EM Cover VGA output Port if present EMI Cover 10 er Take Apart Replacement Note Position the rear of the EMI cover into place first positioning the EMI cover over the video port if present Continue lowering the cover into place by gently squeezing in on both sides as you lower the cover into position SDRAM DIMM 11 er Take Apart SDRAM DIMM Before you begin position the computer face down resting the CRT on an ESD mat or other soft surface SDRAM DIMM 12 Take Apart With a flatbade screwdriver or coin turn the colored latch counterclockwise on the access door Open the access door e Take Apart SDRAM DIMM 13 3 Push down on the plastic tabs to release the SDRAM
37. Apart Logic Board 42 4 Gently lift the down Logic Board Dow n Converter converter board and logic board out of the computer ej Take Apart Logic Board 43 Dow n Converter Board Logic Board _ Using a flatblade screwdriver pry the plastic rivet off the board Put the top half of the rivet back into the bottom half so it doesn t get lost ej Take Apart Logic Board 44 6 Holding onto the down A Down 1 converter press down Converter HA Board d on the black connector to separate the down converter board from the logic board Logic Board Note If you are returning the logic board to Apple refer to the parts database and remove the SDRAM any cables the modem the AirPort Card and I O panel Replacement Note When reinstalling the logic board make sure the antenna wire is not underneath the board er Take Apart Logic Board 45 Identifying 350 MHz Logic Boards 661 2210 There are two 350 MHz logic boards in service stock under the part number 661 2210 One board has an expansion board daughterboard and the other does not have the expansion board Note The boards are completely interchangeable The 350 MHz iMac Slot Loading computer originally came with an expansion board daughterboard on the logic board that provided Ethernet functionality More recent iMac Slot Loading computers and logic board service pa
38. Apart Power Analog Video Board 101 14 Holding on to the side panels lift the power analog video board from Side Panel the inner bezel ej Take Apart Power Analog Video Board 102 Power Board 15 Remove the ten screws Be and pinch the two standoffs to lift the power analog board off the divider panel ej Take Apart Power Analog Video Board 103 16 Lift the board up and out Power nalog Video Boar off the divider panel lifting the board toward the speakers Replacement Note If you re returning the power analog video board to Apple leave the cables attached to the board ej Take Apart Power Analog Video Board 104 Identifying the Rev 2 Power Analog Video Board There is a new revision of the power analog video board The part number is 661 2315 Rev 2 This board must be exchanged like for like The revised board can be identified by the presence of a switch at location SW901 located near the flyback transformer Refer to the next page for switch instructions Power Analog Video Board 105 ej Take Apart Power Supply Analog Board 661 2315 FIL S k Screene Switch Setting Important The switch must be set for the type of the CRT LG Samsung or CPT in the computer If the Rev 2 power analog video board or the CRT are replaced make sure to set the switch to the app
39. Green Blue White Grid Black Grid Power on the iMac Open the Display Adjustment Utility and select the Focus test pattern from the Pattern menu Adjustments Focus Adjustment 12 Adjust the focus control on the flyback transformer until the focus test pattern reaches the best front of screen performance er Adjustments Screen Voltage Setup 13 Screen Voltage Setup Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Set the screen voltage in a dimly lit room before performing the cutoff and white balance adjustments c Adjustments Screen Voltage Setup 14 1 Remove the bottom housing and the top rear housing to access the flyback transformer that contains the screen voltage potentiometer Adjustments Screen Voltage Setup 15 Video Board With the power off remove the left ground cable from the video board Screen Voltage Setup 16 ej Adjustments vg v LI 06 0 I a du Quse Adjustment Tool Connect the jumper adjustment tool 922 4165 to the video board pin Refer to the Jumper Adjustment Tool procedure mentioned earlier in this section Without the jumper installed cutoff and white balance adjustments cannot be saved The jumper enables writing the new settings to the factory space Power on the iMac Screen
40. Mic in pho ne Connector De gauss m Wrap 3 Unwrap the bendable degauss cable wraps in the upper left and upper right corners of the CRT Divider Panel 78 ej Take Apart Lift the degauss cable out of the way to access the side panel screws Using a narrow shaft screwdriver remove the four side panel screws two on each side Divider Panel 79 ej Take Apart Open the CRT cable clamps Remove the wires from the cable clamps ej Take Apart Divider Panel 80 7 Partially lift the side i Divide r panels with the power Panel analog video board i Metal attached to the divider panel up and off the inner bezel to gain access to connector P501 on the power analog video board PSO1 Located at Bottom af Powe ra nalag Bo ard Side nel ej Take Apart Divider Panel 81 Power Analog 4 Video Board PFO o Disconnect P501 and P701 on the power analog video board The cables are located near the high voltage capacitor ej Take Apart Divider Panel 82 9 Onthe other side of the CRT neck disconnect the brown degauss cable P901 from the power analog video board 10 Remove P901 from the cable clamp Cable Power Analog Fed Clamp Video Boar ej Take Apart Divider Panel 83 11 At the very bottom of the power analog video board near the bottom of the CRT disconn
41. Remove the adapter board from the CD ROM Note Return the CD ROM or DVD ROM drive to Apple without the cables carrier or the adapter board Refer to the parts database for more information CD ROM DVD ROM 28 ej Take Apart CDV DVD Slot Manual Eject Button The CD DVD eject mechanism is electrical rather than mechanical on the iMac If you wish to eject a bootable CD ROM disc at startup simply hold down the mouse button until it ejects If the CD is not a bootable disc simply wait for the iMac to boot and drag the CD icon to the trash can If this fails to release the CD there is an eject button which can be activated by a small blunt object such as a CD ROM DVD ROM 29 paper clip The button is located on the right side of the CD slot Note that the power must be on to eject a CD using this method Once you eject the CD it will extend just past the center hole in the disc to facilitate the safe removal of the disc from the drive ej Take Apart CD ROM DVD ROM 30 Waming Label Camier D Camer Tab Grounding Pad Carrier Tab CD ROM or DVD ROM Module Replacement Position the CD ROM or DVD ROM into its carrier as shown 1 Check that the yellow warning label is face up Note if you are installing a new CD DVD carrier remove the blue film covering the grounding pad ej Take Apart CD ROM DVD ROM 31 2 Lower the CD DVD carrier into
42. a if it s connected to the AirPort Card or it it s attached to the protective antenna cap CD ROM Logic Board DY D ROT Data Cable Cable Connector ej Take Apart Down Converter Board 51 3 Remove the five screws on the logic board and five screws on the down converter board Note The two down converter screws located near the speaker are larger screws than the rest of the down converter screws Down Converter ej Take Apart Down Converter Board 52 4 Liftthe boards out of the Logic Board Dow n Converter computer ej Take Apart Down Converter Board 53 5 Using a flatblade P screwdriver pry the rivet off the logic board Dow n Converter Board Put the top half of the rivet back into the bottom half so it doesn t get lost Logic Board ej Take Apart Down Converter Board 54 6 Holding onto the boards press down on the black connector and separate the down converter board from the logic board Dow n Converter Board Logic Board Replacement Note When reinstalling the logic board make sure the antenna wire is not underneath the board ej Take Apart Modem 55 Modem LIA Before you begin position the computer upside down resting the computer on an ESD mat or other soft surface and remove the following bottom housing EMI cover logic board i Note The modem is located on the underside of the logic boa
43. ab Antenna 115 ej Take Apart 4 Before removing the antenna from the divider panel mark the hole with a pen tip that the antenna passes through So you know which hole the antenna goes into when replacing the antenna Lift the antenna board from the divider panel Replacement Note Improper antenna routing in the side panels may cause wireless reception problems ej Take Apart Speakers 116 Left Speaker Fight Speaker Speakers Before you begin rest the computer on an ESD mat or other soft surface and remove the bottom housing The EMI coveris removed in this photo but it is not necessary to remove it to access the speakers Note Service parts package speakers as a kit A left and right speaker will be in each kit ej Take Apart Speakers 117 Disconnect the short speaker cable next to the speaker Note If you are certain a speaker is faulty the easiest removal method is to gently push the speaker down in the direction of the arrow This will bend the biggest tab there are three tabs that connects the speaker to the divider panel Twist the speaker back and forth and slide it off the divider panel Headphone Board 118 ej Take Apart Headphone Audio Board Headphone Board Awarning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety B
44. all system software You must use the system software CD that came with the unit to get the correct version of Mac OS No Go to next step The PMU chip or logic board Press the PMU chip on the logic board with the AC needs to be reset power cord disconnected See The PMU Chip and Resetting the PMU on the Logic Board mentioned earlier in this chapter Connect the power cord and power on the system again Do you have power to the system now Yes Test the unit with MacTest Pro and return the computer to the customer No Plug in the AC power cord and reset the PMU chip again Do you have power to the system now Yes The battery is likely bad check the battery No Go to the next step Bad video cable connection Verify that the CRT video board and video board cables going to and from the power analog board are securely attached If the problem persists go on to the next step Bad SDRAM Reseat replace the SDRAM with known good SDRAM Bad logic board Replace the logic board Bad power analog video Replace the power analog video board board Bad CRT Replace the CRT cr Troubleshooting Symptom Cure Tables Startup Problems Before the Finder Error Beep s If you hear from one to five error beeps at startup with no boot chime you have a hardware problem The table explains how to troubleshoot and repair an iMac unit that sounds one or more error beeps at startup Poss
45. atted with HFS will appear as Mac OS Extended For more information on HFS Plus formatting of hard drives refer to the Technical Info Library article 30344 cr Troubleshooting Testing the Modem 17 Testing the Modem The iMac ships with AppleWorks software which can be used to test the iMac modem connection You should run this test if the modem is not able to dial out To perform this test 1 Locate and launch AppleWorks 2 From the AppleWorks New Document window select Communications and click OK You will be presented with an untitled communications document 3 Click on the settings menu item and select Connection from the menu which will bring up a new window This window allows you to select the communications toolbox device to access the modem 4 Click and hold the menu next to Method and select the Serial Tool from the options presented 5 Click on the Internal Modem setting under the Current Port setting After selecting the port click the OK button You can ignore the rest of the settings 6 Open the serial port by selecting Open Connection from the Session menu 7 Type into the Communications document The modem should respond with an OK message This procedure verifies that the program is connecting with the modem and that the modem is responding cr Troubleshooting Testing the Modem 18 A good test to see if the phone line is working is to type ATDT which will open t
46. bezel with the loop facing down toward the CRT Push the microphone through the hole on the inner bezel see photo on the next page Inner Beze Microphone 132 Check that the microphone protrudes through the inner bezel hole ej Take Apart AirPort Card 18 4 Remove the ground clip from the AirPort Adapter Card AirPort Card Adapter Card 5 Using the pull tab separate the AirPort Fut Together 75s Ground Clip Card from the adapter card Remove Pull Tab CD HD Carrier 19 ej Take Apart CD HD Carrier Before you begin position the computer upside down resting the computer on an ESD mat or other soft surface and remove the following bottom housing EMI cover e SDRAM CD HD Carrier 20 ej Take Apart CD HD Carrie Remove the four screws two on each side connecting the CD HD drive carrier to the divider panel the metal chassis ej Take Apart CD HD Carrier 21 2 Disconnect the following Hard Drive Hard Drive Hard CD ROM cables fro the back of the Power Cable Data Cable Drive DY p ROF CD HD carrier hard drive power cable hard drive data cable e CD ROM DVD ROM data cable logic board cable connector CD RO M Logic Board Dv ROH Data Cable Cable Connector CD HD Carrier 22 ej Take Apart Career 3 Tilt the CD HD carrier forward and lift the carrier out of the computer Note Contin
47. board screw Using a stubby screwdriver remove the screw Disconnect the cable from the connector Remove the power LED board from the divider panel CRT 124 lol Take Apart CRT Awarning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin discharge the CRT rest the computer on an ESD mat or other soft surface and remove the following bottom housing front outer bezel top rear housing divider panel assembly CHT 125 ej Take Apart 1 Remove the four CRT screws and the ground wire 2 Lift the CRT from the inner bezel Caution Be careful when working around the CRT neck rings If the neck rings are bumped the CRT will be knocked out of adjustment and will require replacement of the CRT ej Take Apart CHT 126 Replacing the CRT CRT Notice July 2005 Two vendors LG and CPT previously supplied the CRT for all iMac computers with a slot loading CD ROM DVD ROM or CD RW drive As of July 2005 Apple Service will carry only the CRT supplied by CPT shown for the Northern Hemisphere 922 3877 Apple Service will continue to carry CRTs supplied by both LG and CPT for the er Take Apart CRT 127 Southern Hemisphere 922 3878 and Equatorial 922 3879 regions until further notice Refer to Knowledge Base article 95060 iMac Ho
48. can If this fails to release the CD there is an eject button which can be activated by a small blunt object such as a CD ROM DVD ROM 29 Manual Eject Hale paper clip The button is located on the right side of the CD slot Note that the power must be on to eject a CD using this method Once you eject the CD it will extend just past the center hole in the disc to facilitate the safe removal of the disc from the drive ej Take Apart CD ROM DVD ROM 30 Waming Label Camier CODY D Camer Tab Grounding Pad Carrier Tab CD ROM or DVD ROM Module Replacement Position the CD ROM or DVD ROM into its carrier as shown 1 Check that the yellow warning label is face up Note if you are installing a new CD DVD carrier remove the blue film covering the grounding pad ej Take Apart CD ROM DVD ROM 31 2 Lower the CD DVD carrier into the CD HD carrier 3 Push the CD DVD carrier forward so the carrier tabs go through the holes on the CD HD carrier 4 Replace the CD HD carrier screws ej Take Apart CD ROM DVD ROM 32 5 As afinal check this is a D ROM HD Carrier front view of the CD ROM DVD ROM correctly installed into the CD HD carrier gt a D ROM Drive Front View ej Take Apart CD DVD Adapter Board 33 CD DVD Adapter Board Before you begin position the computer upside down resting the c
49. ce charge Refer to the parts database for more information Hard Drive 38 ej Take Apart CD HD Carrier Hard Drive Replacement When installing the hard drive into the CD HD carrier make sure the hard drive is component side up as shown Logic Board 39 er Take Apart Logic Board Before you begin position the computer upside down resting the computer on an ESD mat or other soft surface and remove the following bottom housing EMI cover The logic board and the down converter board are removed together still connected to each other and are separated once they are removed from the computer ej Take Apart Logic Board 40 Note Remove SDRAM to Hard Drive Hard CD ROM make cable removal easier Power Cable Data Cable Drive DYD ROM us OnthebackoftheCDHD carrier disconnect the hard drive power cable hard drive data cable CD ROM DVD ROM data cable logic board cable connector 2 Disconnectthe antenna if it s connected to the AirPort Card or it it s attached to the protective antenna cap CD ROM Logic Board Dv ROH Data Cable Cable Connector Logic Board 41 ej Take Apart Down X Converter Remove the five screws on the logic board and five screws on the down converter board Note The two screws located at the top of the down converter board near the speakers are larger screws than the other screws ej Take
50. ce parts database or the Exploded View chapter Identifying the 400 MHz Logic Bboards for addition information er Take Apart Down Converter Board 49 Down Converter Board Before you begin position the computer upside down resting the computer on an ESD mat or other soft surface and remove the following bottom housing EMI cover Note The logic board and the down converter board are removed together still connected to each other and are separated once they are removed from the computer ej Take Apart Down Converter Board 50 Note Remove SDRAM to Hard Drive Hard CD ROM make cable removal easier Power Cable Data Cable Drive DYD ROM us OnthebackoitheCDHD carrier disconnect the hard drive power cable hard drive data cable CD ROM DVD ROM data cable logic board cable connector 2 Disconnectthe antenna if it s connected to the AirPort Card or it it s attached to the protective antenna cap CD ROM Logic Board Dv ROH Data Cable Cable Connector ej Take Apart Down Converter Board 51 3 Remove the five screws on the logic board and five screws on the down converter board Note The two down converter screws located near the speaker are larger screws than the rest of the down converter screws Down Converter ej Take Apart Down Converter Board 52 4 Liftthe boards out of the Logic Board Dow n Converter computer ej Ta
51. cket of the video board slides up to the retaining ring on the CRT neck just before the CRT neck rings It is critical that the video board be fully seated in order for the power analog video board to function properly Figure 2 Video Board Improperly and Properly Seated Verifying a Defective Power Analog Video Board 2 3 Check the connection of the RGB cable to the logic board see Figure 3 Figure 3 RGB Cable Connection 4 Remove the RGB cable and inspect the pins on the logic board connector see Figure 4 If the pins are bent carefully attempt to straighten them with a flatblade jeweler s screwdriver or needlenose pliers and test the board again Note The pins on this connector are very fragile If they become damaged you will need to replace the logic board Figure 4 Main Logic Board Connector Pins Verifying a Defective Power Analog Video Board 3 Side Panels 107 ej Take Apart Side Panels Left and Rig ht Side Panels Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin discharge the CRT rest the computer on an ESD mat or other soft surface and remove the following bottom housing front outer bezel top rear housing Side Panels 108 ej Take Apart Undo the wire wraps in the top corners or the CRT Lift the degauss cable out of the way to acce
52. computer from the rear Note To separate the left panel from the right panel remove the rear bracket Otherwise lift the side panels off as a unit next graphic and separate the panels later Side Panels 110 ej Take Apart Pull the panels out to the sides a bit and then lift the side panels up and off the computer Side Panels 111 ej Take Apart Right Side Panel ntenna Board and Cable Carefully remove the antenna wire from each side panel Pull the side panel off the metal divider panel If necessary repeat these steps for the other side panel er Take Apart Antenna 112 EC Bn TED 3 gi A WC Antenna Board Lj ee en oe age eo 6 j 54 o p u 959 kam mS o cum Antenna Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin rest the computer on an ESD mat or other soft surface and remove the following antenna from the AirPort Card if installed or from the clear antenna holder located near the SDRAM DIMMs er Take Apart Antenna 113 bottom housing front outer bezel top rear housing divider panel assembly ej Take Apart Antenna 114 1 Remove the three screws and cable clip on the antenna ej Take Apart Antenna 115 2 Important Note how the antenna wire is
53. crews two on each side CD ROM DVD ROM 25 ej Take Apart C DHO Carrier Carefully turn the CD HD drive carrier over Holding onto the CD ROM from the rear lift the CD ROM carrier out of the CD HD carrier Important Don t press or squeeze the front of the CD ROM Squeezing the front could bend the metal housing making it impossible to insert or remove a CD or DVD disc CD ROM DVD ROM 26 ej Take Apart D Carrier 4 Using a jeweler s screwdriver remove the four screws two on each side on the CD DVD carrier 5 Lift the CD ROM from its carrier er Take Apart CD ROM DVD ROM 27 6 Onthe back of the CD ROM use a jeweler s screwdriver to remove the two screws on the adapter board Screws 7 Remove the adapter board from the CD ROM E Note Return the CD ROM or DVD ROM drive to Apple without the 1 cables carrier or the adapter board Refer to Adapter Bo ard the parts database for more information c e I ELE E eer amp rer etre ee d Bi 06 CD ROM DVD ROM 28 ej Take Apart CDV DVD Slot Manual Eject Button The CD DVD eject mechanism is electrical rather than mechanical on the iMac If you wish to eject a bootable CD ROM disc at startup simply hold down the mouse button until it ejects If the CD is not a bootable disc simply wait for the iMac to boot and drag the CD icon to the trash
54. cuum picture tube 1 Disconnect the microphone connector located near the top of the CRT 2 Disconnect the anode cap 3 Unwrap the bendable degauss cable wraps in the upper left and upper right corners of the CRT ej Take Apart Power Analog Video Board 92 Lift the degauss cable out of the way to access the side panel screws Using a narrow shaft screwdriver remove the four side panel screws two on each side that attach the left and right side panels to the inner bezel Power Analog Video Board 93 ej Take Apart 6 Open the CRT cable clamps Remove the wires from the cable clamps ej Take Apart Power Analog Video Board 94 7 Partially lift the side i Divide r panels with the power Panel analog video board i Metal attached to the divider panel up and off the inner bezel to gain access to connector P501 on the power analog video board PSO1 Located at Bottom af Powe ra nalag Bo ard Side nel ej Take Apart Power Analog Video Board 95 8 Disconnect P501 and P701 on the power Power i ag 4 analog video board The Bos pd cables are located near the high voltage P701 capacitor ej Take Apart Power Analog Video Board 96 9 Onthe other side of the CRT neck disconnect the brown degauss cable P901 from the power analog video board Remove P901 from the cable clamp Cable Power Analog eo
55. d from the CD ROM or DVD ROM drive at both ends and make sure they are attached securely Bad CD ROM or DVD ROM drive Replace CD ROM or DVD ROM drive Bad HD CD DVD data cable Replace the HD CD DVD data cable Bad logic board Replace the logic board cr Troubleshooting Symptom Cure Tables System Problems After Startup 43 Hard Drive Problems Hard drive problems include a hard drive that doesn t operate it doesn t spin or a hard drive that doesn t mount it doesn t appear on the desktop Possible Cause Possible Fix Corrupted drivers Can you see the hard drive using Drive Setup Yes Use Drive Setup to reinstall the software drivers for the hard drive If the problem persists use Drive Setup to reinitialize the hard drive See TIL article 22206 for instructions Warning You will lose all data on the hard drive when you reinitialize it Backup the data first if possible No Go to next step Bad hard drive cables or If you don t see the hard drive using Drive Setup cable connections 1 Check all cable connections to and from the hard drive 2 Replace the HD CD DVD data cable 3 Replace the hard drive 4 Replace the hard drive power cable cr Troubleshooting Symptom Cure Tables System Problems After Startup 44 Sound Out Problems Sound out problems refer to a lack of sound coming from the internal speakers located on the front of the
56. divider panel Twist the speaker back and forth and slide it off the divider panel Headphone Board 120 ej Take Apart Headphone Audio Board Headphone Board Awarning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin remove the bottom housing front outer bezel top rear housing divider panel assembly with side panels power analog board and speakers attached ej Take Apart Headphone Board 121 Headphone amp udia Board Turn the divider panel over Remove the speaker to access the headphone audio board screw Using a stubby short screwdriver remove the screw Disconnect the connector from the heaphone board Remove the headphone board from the divider panel Power LED Board 122 ej Take Apart Pawer LED Board Power LED Board Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin discharge the CRT rest the computer on an ESD mat or other soft surface and remove the following bottom housing front outer bezel top rear housing divider panel assembly Take Apart Power LED Board 123 Fowe r LED Board Connector Turn the divider panel over and remove the speaker to access the power LED
57. e er Adjustments LED Alignment Procedure 58 adjustment part number 011 0206 Power Button LED Alignment into the appropriate section in AppleOrder Service Source Upgrades iMac iMac DV iMac DV Special Edition ej Upgrades Memory The iMac comes with a minimum of 64 MB of SDRAM and can be expanded to a maximum of 512 MB Install a memory module that meets the following specifications e JEDEC PC 100 DIMM 64 128 or 256 MB 168 pin Note Memory used in this computer is not the same as that used in previous iMac computers 2 ej Upgrades Note Place a soft towel or cloth on the desk or surface Position the screen face down on the cloth 1 Using a flatblade screwdriver or a coin turn the latch counterclockwise to open the rear access door 2 Lower the access door ej Upgrades 3 3 Touch the EMI cover that Gower hetal is visible inside the recessed latch area before touching any components on the main logic board This protects the computer from damage caused by electostatic discharge Important If necessary remove any existing memory module ej Upgrades 4 4 Push the ejector tabs on the slots outward and down so they are in the open position 5 ej Upgrades 5 Align the notches on the memory module with the small notches inside the slot 6 Push down on the DIMM until it s
58. e iMac Slot Load CD DVD Service Price Pages er Basics Repair Strategy Warranty 20 Large businesses universities and K 12 accounts must provide a purchase order on all transactions including orders placed through the AppleOrder U S only or ARIS Canada only system USA Ordering U S Service providers not enrolled in AppleOrder may fax their orders to Service Provider Support 512 908 8125 or mail them to Apple Computer Inc Service Provider Support MS 212 SPS 2323 Ridgepoint Drive Austin TX 78754 er Basics Repair Strategy Warranty 21 For U S inquiries please call Service Provider Support 800 919 2775 option 1 Canadian Ordering Canadian service providers not enrolled in ARIS may fax their orders to Service Provider Support in Canada 800 903 5284 For Canadian inquiries please call Service Provider Support 800 217 9517 Warranty US Only The iMac iMac DV and iMac DV Special Edition computers are covered under the Apple One Year Limited Warranty The AppleCare Service Plan is also available for these products Service Providers are reimbursed for warranty Repair Strategy Warranty 22 5 and AppleCare repairs For pricing information refer to Service Price Pages Canada Only The iMac iMac DV and iMac DV Special Edition computers are covered under AppleCare The Extended AppleCare Service Plan is also available for these products Service Provid
59. e in the computer The CRT switch settings are silk screened on the board near SW901 If this power analog video board or the CRT are replaced make sure to set the switch to the appropriate position One way to quicky identify an LG CRT is by a black sticker on the left side of the CRT covering the LG label This board must be exchanged like for like The graphic below shows the revised board 661 2315 Rev 2 and the original power analog video board 661 2212 Switch Settings Switch ew 31 sarap mo T E A Ram Pon i Ls B Vw 661 2212
60. e logic board Refer to the picture on the next page to locate the necessary test point referenced in the following procedure Plug in the computer but leave the iMac powered OFF Ground the black probe on the volt meter to the logic board screw as shown in the photograph below With one hand behind your back touch the red probe on the volt meter to the top pad pin 1 at J9 see the photograph below on the logic board to see if you have 5 on the logic board A 5 reading on the logic board means the power supply is providing the necessary trickle voltage to the logic board a x F EF E f a p S M SEI EE Ho 1 L i I L I LI LI l I See Ja Fin CHIT pall i LUE Testing for 5 V Trickle Power at J9 on the Logic Board oi Troubleshooting Testing for Power 6 Testing DCO Down Converter On Voltage at C10 on the Logic Board In a No Power situation first check for 5 V trickle power at J9 refer to Testing J9 for 5 V Trickle Power on the Logic Board then check the DCO Down Converter On voltage on the logic board at capacitor C10 see figure below The DCO voltage should be present as soon as the power cord is plugged into the computer Ground the black probe on the volt meter to the logic board screw as shown in the photograph below Touch the red probe to C10 see the photograph below The DCO
61. ect T P902 which is part of wA 4 fae 1 the audio headphone zia i X LED speaker cable assembly er Take Apart Divider Panel 84 Video Board Ground Cables 12 Disconnect the two black ground cables going to the video board Caution Be careful when working around the CRT neck rings If the neck rings are bumped the CRT will be knocked out of adjustment and will require replacement of the CRT ej Take Apart Divider Panel 85 13 Loosen the CRT neck Video Board clamp screw CRT Weck Screw Take Apart Divider Panel 86 14 Carefully pull the video Video Board board off the CRT neck Divider Panel 87 ej Take Apart Divider 15 Lift and remove the entire divider panel assembly off the inner bezel Note Continue with the Take Apart procedure to remove the service parts from the divider panel ej Take Apart Divider Panel 88 16 Remove the following Powe ra nalog parts to replace the tL Degauss Y ideo Board CRI divider panel shown on Side Cable aide the next page nte nna R Speaker Speaker h Fowe r LED Head pho ne Divider CD HD En ard En ard Panel Drove Carmer Take Apart Divider Panel 89 17 This is the divider panel service part number 922 4044 Power Analog Video Board 90 ej Take Apart Power nag Video Board Power Analog Video Board Before you begi
62. ector and separate the down converter board from the logic board Dow n Converter Board Logic Board Replacement Note When reinstalling the logic board make sure the antenna wire is not underneath the board ej Take Apart Modem 55 Modem LIA Before you begin position the computer upside down resting the computer on an ESD mat or other soft surface and remove the following bottom housing EMI cover logic board i Note The modem is located on the underside of the logic board Modem 56 ej Take Apart Screw Panel Screw With the logic board facing right side up disconnect the cable at J12 Remove the two screws on the I O panel Modem 57 ej Take Apart Turn the logic board to the underside and remove the modem screw Modem 58 ej Take Apart D Panel Rotate the logic board right side up again Carefully slide the I O panel off the logic board Note As you slide the 1 O panel off the logic board support the modem with your other hand so the modem doesn t fall off the logic board Remove the modem from its connector slot on the underside of the logic board ej Take Apart Modem 59 0 Panel Metal Frame Logic Board Modem Replacement The I O panel and the modem are sandwiched between the logic board and the metal frame of the I O panel The metal frame fits on top of the l
63. efore you begin remove the bottom housing front outer bezel top rear housing divider panel assembly with side panels power analog board and speakers attached ej Take Apart Headphone Board 119 Headphone Audio Board Turn the divider panel over Remove the speaker to access the headphone audio board screw Using a stubby short screwdriver remove the screw Disconnect the connector from the heaphone board Remove the headphone board from the divider panel Power LED Board 120 ej Take Apart Pawer LED Board Power LED Board Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin discharge the CRT rest the computer on an ESD mat or other soft surface and remove the following bottom housing front outer bezel top rear housing divider panel assembly ej Take Apart Power LED Board 121 FE I Fowe Board m Connectar SS d li QU Ye Turn the divider panel over and remove the speaker to access the power LED board screw Using a stubby screwdriver remove the screw Disconnect the cable from the connector Remove the power LED board from the divider panel CRT 122 lol Take Apart CRT Awarning This product contains high voltage and a high vacuum picture tube
64. ej Take Apart Carrier Hard Drive Using a 1 Phillips screwdriver remove the four hard drive mounting screws Note Support the hard drive with one hand so the hard drive doesn t fall out of the carrier ej Take Apart Hard Drive 37 CD HD Carrier 2 Remove the hard drive from the CD HD carrier Note Return the drives without the cables or carriers Exchange Apple hard drive modules in Apple packaging Failure to comply with this requirement may result in a packaging noncompliance charge Refer to the parts database for more information Hard Drive 38 ej Take Apart CD HD Carrier Hard Drive Replacement When installing the hard drive into the CD HD carrier make sure the hard drive is component side up as shown ej Take Apart Logic Board 39 Logic Board Before you begin position the computer upside down resting the computer on an ESD mat or other soft surface and remove the following bottom housing EMI cover The logic board and the down converter board are removed together still connected to each other and are separated once they are removed from the computer Logic Board 40 ej Take Apart Note Remove SDRAM to Hard Drive CD ROM DY CD ROM Hard Drive Data Cable Hard Drive Power Cable ED D D RU Data Cable Logic Board Cable Connector make cable removal easier 1 On the back o
65. ers are reimbursed for warranty and AppleCare repairs For pricing information refer to Service Price Pages Service Source Specifications iMac iMac DV iMac DV Special Edition er Specifications Introduction 1 Introduction Specifications information for this product can be found in the Spec Database which you can access at Service Source Online http service info apple com or on Service Source CD Spec Database at Service Source Online From the Service Source Online home page click Troubleshoot and Repair to access the main repair procedures page Then click either Apple Spec in the navigation table in the upper right corner of the page or click Apple Spec Database from the list of reference tools below Spec Database on Service Source CD Open the CD and double click the Apple Spec Database alias located at the top level of the CD Service Source Troubleshooting iMac iMac DV iMac DV Special Edition cr Troubleshooting Introduction 1 Introduction This chapter contains basic theory of operations information as well as detailed Symptom Cure tables both of which should help you troubleshoot and repair the iMac iMac DV and iMac DV Special Edition systems The Symptom Cure tables are broken down into two sections problems that can occur at startup time before the Finder appears on the screen and problems that can occur after a successful startup Each major symptom has its own s
66. f Adjustment 21 Video Board Ground Cables Set the Screen Voltage if you haven t done so already Refer to Screen Voltage Setup mentioned earlier in this section 1 Remove the bottom housing and the top rear housing to access the video board 2 With the power off remove the left ground cable from the video board ej Adjustments Cutoff Adjustment 22 3 Connect the jumper adjustment tool see graphic Refer to Jumper Adjustment ooo m 0 Tool mentioned earlier in this section 4 Power on the computer Make sure the monitor has been on for at least 10 minutes before making adjustments ej Adjustments Li Cutoff Adjustment 23 Red Drive Green Drive Blue Drive Red Cutoff Green Cutoff Blue Cutoff Contrast Brightness Display Adjustment Utility Open the Display Adjustment Utility and select the Color tab Set the drive and cutoff controls to their midpoint positions Note The Revert and Save buttons are normally dimmed until a slider bar is moved If you need to return to the previous color setting either select Color Revert from the File menu or press the Command R keys Command R should be Cutoff Adjustment 24 er Adjustments used if all the color drive controls are set to zero and the screen is completely black The Command R function has the same function as Color Revert from the File menu and the Re
67. f the CD HD carrier disconnect the hard drive power cable hard drive data cable CD ROM DVD ROM data cable logic board cable connector Disconnect the antenna if it s connected to the AirPort Card or it it s attached to the protective antenna cap Logic Board 41 ej Take Apart Down Converter Remove the five screws on the logic board and five screws on the down converter board Note The two screws located at the top of the down converter board near the speakers are larger screws than the other screws ej Take Apart Logic Board 42 4 Gently lift the down Logic Board Down Converter converter board and logic board out of the computer ej Take Apart 5 Using a flatblade T EI X v d screwdriver pry the Bnard plastic rivet off the board Logic Board 43 Put the top half of the rivet back into the bottom half so it doesn t get lost au quu uuu EX Logic Board ae LL ej Take Apart Logic Board 44 A Holding onto the down converter press down on the black connector to separate the down converter board from the logic board Converter Board Logic Board Note If you are returning the logic board to Apple refer to the parts database and remove the SDRAM any cables the modem the AirPort Card and I O panel Replacement Note When reinstalling the logic board make sure the antenna wire is not underneath the board
68. formation The new Version 2 logic board is part number 661 2317 The Version 2 board and the more recent 661 2210 without a daughterboard board look identical apart from the revision number on the VLSI chip The Version 2 board 661 2317 will have a revision number of 09 or OA on the VLSI chip see below Important The 350 MHz logic boards must be exchanged like for like 661 2317 350 MHz Ver 2 661 2210 350MHz original Ma FirreVire VLSI Chip OVILSI 9052 ZABBBS71 VY 22099R 34350339 09 Apple Hass CANADA oj Exploded View 6 Identifying the 400 MHz Logic Boards There is a new version of the 400 MHz logic board for the iMac DV and iMac Special Edition The easiest way to identify the boards is by the daughterboard The Version 2 logic board 661 2316 does not have a daughterboard Logic boards must be exchanged like for like Reference the graphic below to identify which board you have 667 2211 400 MHz original board with daughter board Daughter Board FireWire Ports 661 2216 400 MHZ Ver 2 revised board no daughter board Fej Exploded View 7 Identifying the Power Analog Video Boards There is a new revision backward compatible of the power analog video board 661 2315 Rev 2 for the slot load iMac The revised board can be identified by the presence of a switch at location SW901 see below The switch must be set for the type of the CRT LG Samsung or CPT tub
69. h the unit to get the correct version of Mac OS Bad USB device Turn off the computer and disconnect all USB devices Next power on the system using the power button on the front of the unit and begin adding back the USB device one at time beginning with the keyboard and then the mouse and so on If the system hangs only after you reconnect a particular USB device replace that USB device Bad memory Run MacTest Pro in loop mode overnight to test for bad memory If MacTest Pro finds a bad memory module or other hardware replace the hardware in question with a known good module Bad logic board Replace the logic board cr Troubleshooting Symptom Cure Tables System Problems After Startup 31 Distorted Video Distorted Video refers to a problem with the screen geometry or focus Possible Cause Possible Fix System is out of focus Adjust the focus using the Display Adjustment Utility on the MacTest Pro CD See Focus in the iMac Adjustments chapter for instructions Screen geometry is out of Adjust the screen geometry using the Display Adjustment adjustment display is off Utility on the MacTest Pro CD See Geometry in the center sides or top of the iMac Adjustments chapter for instructions screen are not straight etc Screen cutoff or white bal Adjust the cutoff or white balance using the Display ance is out of adjustment Adjustment and Display Service Utilit
70. he cable or printer Bad external USB port If the printer is connected to a third party hub switch it to one of the iMac ports in the I O panel Does the printer work now Yes You have a bad third party hub Replace the device that contains the problem USB port or refer to the third party documentation for troubleshooting procedures No Go to next step Bad USB port on the iMac If the printer is already connected to a USB port on the iMac switch it to the other USB port Does the printer work now Yes Replace the logic board No Go to next step System software is cor rupted Perform a clean install of the system software using the Mac OS CD that shipped with the iMac You must use the system software CD that came with the iMac in order to get the correct version of Mac OS 8 1 with the appropri ate iMac enablers Bad cable Replace the printer interface cable Bad logic board Replace the logic board cr Troubleshooting Symptom Cure Tables System Problems After Startup 51 Networked Printer Problems This troubleshooting table deals with an iMac that cannot print to an attached known good networked printer Possible Cause Possible Fix Bad network connections Check the network connections Wrong version of system Verify that you have the correct version of Mac OS If you software is installed are unsure reinstall the system software using the orig
71. he order in which it is presented Note If you are instructed to replace a module and this does not fix the problem be sure to reinstall the original module before you proceed to the next fix Power Macintosh 7500 Symptom Charts 30 System Hangs Refer to this table if your system intermittently hangs freezes during normal oper ation Note if your system only hangs when using a specific application the problem is most likely with the application and not with your iMac hardware or system soft ware If this table does not solve the problem refer to the Software Troubleshooting manual on Service Source under the Troubleshooting tab for more comprehensive information Possible Cause Possible Fix System Extensions causing Boot with Extensions off by holding down the Shift key a conflict during startup See TIL article 14343 for more information on possible Extension conflicts Does the system startup successfully with Extension off Yes Begin adding back the system Extensions one at a time and starting up the system after each addition If the system freezes again you know that the last Extension you added is causing the problem No Go to the next step Corrupted system soft Boot from the system CD that came with the unit Does ware the problem recur Yes Go to next step No The system software is most likely the problem Reinstall system software You must use the system software CD that came wit
72. he phone line If the modem reports NO DIAL TONE there isn t a valid analog line connected If the phone line works you will hear a dial tone until you press the Return key at which time the modem will report NO CARRIER A No Carrier message means the phone line was successfully opened Other things that can be done here are Call another modem to verify connections Call a working phone number to see if you can successful connect to an outside line Use the ATI1 17 commands to check firmware versions and modem features Use ATZ to reset the modem back to its original configuration cr Troubleshooting Symptom Cure Tables Startup Problems Before the Finder Symptom Cure Tables Startup Problems Before the Finder Appears If you have trouble starting up the iMac and the problem occurs before the Finder appears on the screen you may have either a software or a hardware problem Following are troubleshooting tables with problem symptoms that you may see before the Finder appears Possible causes for each symptom can be found in the left hand column with the corre sponding fixes in the right hand column The troubleshooting information is presented in the order of the most probable cause and fix therefore Apple strongly recommends that you carry out the troubleshooting in the order in which it is presented Note If you are instructed to replace a module and this does not fix the problem be sure to reinstall the origi
73. ible Cause Possible Fix No DRAM is installed or Do you hear one error beep at startup detected Yes Follow these steps to resolve the problem 1 Make sure the DRAM are PC 100 SDRAM Reseat the SDRAM and try again 2 If no SDRAM is present install a known good PC 100 SDRAM and try again 3 If DRAM is present replace DIMM one at a time with a known good PC 100 SDRAM No Go to next step Incompatible RAM is Do you hear two error beeps at startup installed Yes Verify that only SDRAM PC 100 DIMMs are installed The iMac ships with PC 100 SDRAM memory and is not compatible with EDO DIMMs No Go to next step Bad RAM Do you hear three error beeps at startup Yes Replace the existing SDRAM one DIMM at a time with known good PC 100 SDRAM No Go to next step Bad ROM Do you hear four or five error beeps at startup Yes Replace the logic board No If you do not hear any error beeps at startup you have a different problem and should refer to one of the other troubleshooting tables in this chapter cr Troubleshooting Symptom Cure Tables Startup Problems Before the Finder Appears Flashing Question Mark This problem refers to a flashing question mark that appears on the screen during star tup Possible Cause Possible Fix Corrupted system software Boot from the system CD that came with the unit Can you or software drivers see the hard drive on the desktop Yes The sys
74. ide down resting the computer on an ESD mat or other soft surface and remove the following bottom housing EMI cover e SDRAM CD HD Carrier 20 ej Take Apart C D HD Carrie Remove the four screws two on each side connecting the CD HD drive carrier to the divider panel the metal chassis ej Take Apart CD HD Carrier 21 2 Disconnect the following Hard Drive Hard Drive Hard CD ROM cables fro the back of the Power Cable Data Cable Drive DY D ROM CD HD carrier hard drive power rt cable hard drive data cable CD ROM DVD ROM data cable logic board cable connector Tap Logic Board Data Cable Cable Connector CD HD Carrier 22 ej Take Apart Career wary 3 Tilt the CD HD carrier forward and lift the carrier out of the computer Note Continue with the Take Apart procedures if you are replacing the CD ROM DVD ROM or the hard drive CD ROM DVD ROM 23 ej Take Apart CD ROM DVD ROM Note The procedures for removing a CD ROM or DVD ROM are identical This procedure will reference the CD ROM Take Apart Before you begin position the computer upside down resting the computer on an ESD mat and remove the following bottom housing EMI cover SDRAM CD HD carrier ej Take Apart CD ROM DVD ROM 24 1 Using a Phillips Screws screwdriver remove the CD HD carrier USE EU mounting s
75. ies on the MacTest Pro CD See Video in the iMac Adjustments chapter for instructions lol Troubleshooting Symptom Cure Tables System Problems After Startup 32 Thin White Line A a thin white horizontal line scrolls from top to bottom or bottom to top on the iMac display Possible Cause Possible Fix Display may need adjust Adjust the cutoff or white balance using the Display ing Adjustment and Display Service Utilities on the MacTest Pro CD See Video in the iMac Adjustments chapter for instructions Power analog video board Replace the power analog video board is faulty cr Troubleshooting Symptom Cure Tables System Problems After Startup 33 Tinting Video Tinting Video refers to a predominant color tint or color covering the screen Possible Cause Possible Fix Environmental causes Verify that the iMac unit is not near other equipment such as speakers radios phones fluorescent lighting magnets or other electronic equipment that could affect the video display If necessary move the iMac computer to another area and restart the unit Loose video cables Reseat the video cables connecting from the power analog board to the video board Make sure that both ends of the cable are firmly seated into their connectors Loose video board Reseat the video board on the CRT neck Make sure the CRT neck screw is secure Color is out of adjustmen
76. ill have a revision number of 09 or 0A on the VLSI chip as shown Refer to the Parts Database and the Exploded View chapter Identifying the 350 MHz Logic Board for more information er Take Apart Logic Board 48 Identifying the 400 MHz Logic Boards There is a new version of the 400 MHz logic board for the iMac DV and iMac Special Edition The easiest way to identify the boards is by the daughterboard The new Version 2 logic board 661 2316 does not have a daughterboard Logic boards must be exchanged like for like Refer to the service parts database or the Exploded View chapter Identifying the 400 MHz Logic Bboards for addition information ej Take Apart Down Converter Board 49 Down Converter Board Before you begin position the computer upside down resting the computer on an ESD mat or other soft surface and remove the following bottom housing EMI cover Note The logic board and the down converter board are removed together still connected to each other and are separated once they are removed from the computer ej Take Apart Down Converter Board 50 Note Remove SDRAM to Hard Hard Drive Hard CD ROM make cable removal easier Power Cable Data Cable Drive DYD ROM uu OnthebackoftheCDHD carrier disconnect the hard drive power cable hard drive data cable CD ROM DVD ROM data cable logic board cable connector 2 Disconnect the antenn
77. inal CD that shipped with the iMac unit Chooser is set incorrectly Open the Chooser and verify that you have the correct printer and printer driver selected System network or Perform a clean install of the system software you must printer software is cor use the system software CD that came with the iMac in rupted order to get the correct version of Mac OS with the appropriate iMac enablers and or the network and printer software General network problems Refer to the Network Problems troubleshooting table earlier in this chapter Bad logic board Replace the logic board cr Troubleshooting Symptom Cure Tables System Problems After Startup 52 Modem Not Recognized This table should help you troubleshoot and fix problems when the internal modem is not recognized Follow the instructions under the Possible Fix column to resolve the problem Possible Cause Possible Fix Modem Is Not Recognized If the modem is not recognized or listed in the application or OS refer to this section of the table Needed extensions or CCL Are the correct CCL and extension files installed Note files are notinstalled orare You will need the iMac Modem Extension and the iMac corrupt internal modem CCL Yes The CCL or extension may be corrupt Reinstall the CCL and modem extension If the problem persists reinstall the system software and try again No Install the correct CCL and modem e
78. into the Adapter Card this photo shows the ground clip already in place Pull Tab Upgrades 11 amp irPart AdapterCarnl Connect the antenna by plugging the antenna wire into the small hole in the end of the AirPort Card 12 er Upgrades AirPort GAirPort Card Adapter Card AirPort Adapter Card Connector Guide Rails for AirPort Card AirPort Adapter Card 8 Align the edges of the AirPort Card with the guides on the AirPort Card slot Insert the AirPort Card into the adapter Card connector 9 Close the access door test the computer before returning it to the customer Important After installing an AirPort Card on a brand new iMac you must hold down Option S when restarting the computer This preserves the Setup Assistant experience a 13 movie and setup instructions for the customer If these keys are not held down when restarting the computer after an upgrade the Setup Assistant file will execute for the dealer disable itself and the customer will never see it 14 ej Upgrades Connect an External Monitor If the iMac has a VGA output port you can connect an external monitor to the computer and mirror or show what s on the computer display to a larger audience Note You can t use this port to connect a second monitor to extend the desktop ej Upgrades 15 10 Place the computer face down
79. ive Beeps Bad checksum for the remainder of the boot ROM The ROM which is located on the processor module is bad iMac Verifying a Defective Power Analog Video Board Many of the power analog video boards returned to Apple as bad or DOA have no trouble found at the repair facility It is important to verify a defective power analog video board properly before ordering a replacement Follow the steps below to verify if the issue is due to a bad power analog video board or if something else is causing the problem Products affected iMac Slot Loading iMac Summer 2000 iMac Early 2001 e iMac Summer 2001 Procedure 1 Check for bent pins on the CRT neck see Figure 1 Remove the video board and observe the pins on the CRT neck Make sure all of them are straight If the pins are not straight carefully attempt to straighten them with a flatblade jeweler s screwdriver or needlenose pliers and test the board again Figure 1 CRT Neck Pins 073 0593 Rev A 2 Make sure the video board is properly seated on the CRT neck see Figure 2 The top picture shows the video board improperly seated the bottom picture shows it properly seated When the video board is properly seated the plastic socket of the video board slides up to the retaining ring on the CRT neck just before the CRT neck rings It is critical that the video board be fully seated in order for the power analog video board to function proper
80. ke Apart Down Converter Board 53 5 Using a flatblade aa screwdriver pry the rivet off the logic board Dow n Converter Board Put the top half of the rivet back into the bottom half so it doesn t get lost Logic Board ej Take Apart Down Converter Board 54 6 Holding onto the boards Down press down on the black Converter connector and separate Board zi the down converter board from the logic board Logic Board Replacement Note When reinstalling the logic board make sure the antenna wire is not underneath the board Modem 55 ej Take Apart Modem Before you begin position the computer upside down resting the computer on an ESD mat or other soft surface and remove the following bottom housing EMI cover logic board Note The modem is located on the underside of the logic board Modem 56 ej Take Apart Screw 170 Panel With the logic board facing right side up disconnect the cable at J12 Remove the two screws on the I O panel ej Take Apart Modem 57 3 Turn the logic board to the underside and remove the modem screw Modem 58 ej Take Apart Logic 130 Panel Rotate the logic board right side up again Carefully slide the I O panel off the logic board Note As you slide the 1 O panel off the logic board support the modem with your other hand so the modem doesn t fall off
81. l to the video board refer to the Jumper Adjustment Tool mentioned earlier in this section ej Adjustments Geometry Adjustments 38 Geometry Color V Width Height Horizontal Vertical Keystone Pincushion Rotation Parallelogram Pincushion Bal 5 Correction 21 E3 48 2 Di 53 c2 BF 9E 1 Open the Display Adjustment Utility 2 Select the Geometry tab Geometry Adjustments 39 er Adjustments Resolution 640 x 480 800x 600 1024 x 768 3 Select a resolution for adjustment from the Resolution menu Note Don t use the control strip or Monitors control panel to set the resolution Geometry Adjustments 40 ej Adjustments Geometry Color Width Height Horizontal Vertical Keystone Pincushion Rotation Parallelogram Pincushion Bal 5 Correction 21 E3 48 2 Di 53 c2 BF 9E 4 Adjust the geometry settings by moving the appropriate slider bar Click the Save button to save the adjustments for that resolution Note Repeat steps 2 4 for each resolution when adjusting width height horizontal vertical keystone and pincushion Restart the computer and reset the parameter RAM to save geometry adjustments to the Factory memory setting ej Adjustments Geometry Adjustments 41 7 Toreset the PRAM hold down the lt Command gt lt O
82. lowing bottom housing front outer bezel top rear housing ej Take Apart Microphone 132 1 Disconnect the Mic i phone Connector microphone connector Ei E 7 4 p If you can t access the a microphone connector unwrap the bendable degauss cable wrap Es 2 Pull the microphone from the inner bezel Microphone 133 Replacing the Microphone 1 Insert the microphone into the inner bezel with the loop facing down toward the CRT Push the microphone through the hole on the inner bezel see photo on the next page Take Apart Microphone 134 Mic m pho ne nner Bezel _ Check that the microphone protrudes through the inner bezel hole er Adjustments Adjustment Tools 1 Adjustment Tools The following items are needed to perform video adjustments on the slot loading iMacs Display Adjustment Utility 4 0 jumper adjustment tool 922 4165 light meter Model R77 The utility can be found on the Service Source CD or online at http service info apple com Adjustment Tools 2 ej Adjustments 200 1000 fe 50 290 fe 10 50 fe Light Meter Setup This topic covers setup for light meter Model R77 service part number 076 0310 Note The adjustments were optimized for light meter Model R77 To obtain more consistent color results use only the R77 light meter when performing color adj
83. ly Figure 2 Video Board Improperly and Properly Seated Verifying a Defective Power Analog Video Board 2 3 Check the connection of the RGB cable to the logic board see Figure 3 Figure 3 RGB Cable Connection 4 Remove the RGB cable and inspect the pins on the logic board connector see Figure 4 If the pins are bent carefully attempt to straighten them with a flatblade jeweler s screwdriver or needlenose pliers and test the board again Note The pins on this connector are very fragile If they become damaged you will need to replace the logic board Figure 4 Main Logic Board Connector Pins Verifying a Defective Power Analog Video Board 3 Troubleshooting Power Button 12 Power Button The power button on the front of the iMac see Table 1 below will power up the computer or put it to sleep but it will not shut the iMac down Note When the iMac is in Sleep mode the amber LED pulses on and off The power button on the keyboard see Table 2 below retains previous functionality The keyboard button can power up the iMac put the iMac to sleep or shut down the computer with a press of the button And as before you can shut down the com puter by selecting Shut Down in the Special menu Table 1 iMac Power On Button Functionality Pressing the Power On Button on the Front of the iMac When the Computer is Powered On Result iMac goes immediately to sleep unless a server is
84. module s lt 4 Carefully lift the SDRAM from the slot 5 eS P 5 p Note Remove installed SDRAM from the logic board before returning the logic board to Apple ej Take Apart AirPort Card 14 AirPort Card AirPort Before you begin position B the computer face down E be resting the CRT on an ESD Door mat or other soft surface Note If the AirPort Card is not installed a protective antenna cap will be attached to the antenna AirPort Card 15 Take Apart With a flatbade screwdriver or coin turn the colored latch to open the access door The antenna and AirPort Card will be visible when you open the access door ej Take Apart AirPort Card 16 2 Remove the AirPort Card Card AirPort Card AirPert Guide Connector Adapter Card Guide which sits in the adapter card from the card guides and AirPort connector ej Take Apart AirPort Card 17 3 Disconnect the antenna from the small hole AirPort Card Antenna AirPort Connector AirPort Card AirPort AdapterCarnl ej Take Apart AirPort Card 18 4 Remove the ground clip from the AirPort Adapter Card AirPort Card Ada pte r Card 5 Using the pull tab separate the AirPort Fut Together Ext Ground Clip Card from the adapter mi card Pull Tab CD HD Carrier 19 ej Take Apart CD HD CD HD Carrier Before you begin position the computer ups
85. n discharge the CRT rest the computer on an ESD mat or other soft surface and remove the following bottom housing front outer bezel top rear housing Note There is a new power analog video board part number 661 2315 Rev 2 Refer to Identifying the Rev 2 Power Analog Video Board in this section ej Take Apart Power Analog Video Board 91 Warning This product Mic m pho Connector contains high voltage and a Wrap To prevent serious injury review CRT safety in Bulletins Safety Degauss _ _ high vacuum picture tube 1 Disconnect the microphone connector located near the top of the CRT 2 Disconnect the anode cap 3 Unwrap the bendable degauss cable wraps in the upper left and upper right corners of the CRT ej Take Apart Power Analog Video Board 92 Lift the degauss cable out of the way to access the side panel screws Using a narrow shaft screwdriver remove the four side panel screws two on each side that attach the left and right side panels to the inner bezel Power Analog Video Board 93 ej Take Apart 6 Open the CRT cable clamps Remove the wires from the cable clamps ej Take Apart Power Analog Video Board 94 7 Partially lift the side i Divide r panels with the power Panel analog video board i Metal attached to the divider panel up and off the inner bezel to gain access t
86. n t look equal in size go on to the next step S Correction Adjustment 44 ej Adjustments Width Height Horizontal Vertical Keystone Pincushion Rotation Parallelogram Pincushion Bal S Correction 21 E3 48 2 Di 53 c2 BF 9E 3 Open the Display Adjustment Utility and select the Geometry tab If the squares need adjusting move the S Correction slider bar Select the White Grid test pattern again from the Pattern menu and check that all the squares on the White Grid test pattern appear equal in size If the squares need further adjusting repeat steps 4 5 S Correction Adjustment 45 ej Adjustments Geometry Color Y Width Height Horizontal Vertical Keystone Pincushion Rotation Parallelogram Pincushion Bal 5 Correction 21 E3 48 2 Di 53 c2 BF 9E 6 When all the squares look uniform on the S Correction test pattern go back to the Geometry tab window and click the Save button 7 Restartthe computer and reset the parameter RAM PRAM to save these adjustments to the Factory Setting To reset the PRAM hold down the lt Command gt lt Option gt lt P gt and lt R gt keys after Restart is selected from the Special menu ej Adjustments S Correction Adjustment 46 Note If you don t Ei iMac H restart the computer d the iMac will display the Mf last settings made on the Monit
87. nal module before you proceed to the next fix cr Troubleshooting Symptom Cure Tables Startup Problems Before the Finder Appears No Power In a Power situation the system is completely dead There is no LED no hard drive power and the screen is completely black Refer to Testing for Power ear lier in this chapter for instructions on how to test for power at each component refer enced in this procedure Possible Cause Possible Fix Bad power cord connec Verify the power outlet is good tion or outlet Try a known good power cord to determine if the existing power cord could be the problem Make sure the power cord is connected securely at both ends Improperly aligned front If the front power on LED is not centered properly power on button within the inner button the inner power button can become stuck between the LED and the inner bezel resulting in a no power intermittent shut down or sleep situation Refer the LED Alignment procedure in the Adjustments chapter or to TIL article 58622 for steps to resolve the LED alignment issue Bad USB keyboard Verify the keyboard cable is connected properly to the computer Disconnect the keyboard and power on the system via the button on the front of the computer Do you have power to the system now Yes The keyboard is bad Replace the keyboard No Go to next step The PMU chip needs to be Press the PMU chip on the logic board
88. naps into place The ejectors will automatically close 7 Close the rear access door and test the computer before returning it to the customer Important After upgrading memory on a brand new iMac you must hold down 6 Option S when restarting the computer This preserves the Setup Assistant experience a movie and setup instructions for the customer If these keys are not held down when restarting the computer after an upgrade the Setup Assistant file will execute for the dealer disable itself and the customer will never see it ej Upgrades AirPort Card Place a soft towel or cloth on the desk or surface 1 Position the screen face down on the cloth Use a coin or flatblade screwdriver to turn the latch counterclockwise on the access door 2 Open the access door ej Upgrades Gower ET bos Touch the metal EMI shield inside the recessed latch area before touching any components on the main logic board 9 Guide Rails Antenna Protective Antenna Cap Detach the antenna from the left guide rail Remove the protective antenna cap from the end of the antenna and store the cap in a safe place ej Upgrades 10 6 Slide the AirPort Card into the adapter card Note It is probably easiest to attach the AirPort Card metal ground clip over Put Together the AirPort Card once the card is installed
89. necessary to remove it to access the speakers Note Service parts package speakers as a kit A left and right speaker will be in each kit ej Take Apart Speakers 120 Disconnect the short speaker cable next to the speaker Note If you are certain a speaker is faulty the easiest removal method is to gently push the speaker down in the direction of the arrow This will bend the biggest tab there are three tabs that connects the speaker to the divider panel Twist the speaker back and forth and slide it off the divider panel Headphone Board 121 ej Take Apart Headphone Audio Board Headphone Board Awarning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin remove the bottom housing front outer bezel top rear housing divider panel assembly with side panels power analog board and speakers attached ej Take Apart Headphone Board 122 Headphone Audio Board Turn the divider panel over Remove the speaker to access the headphone audio board screw Using a stubby short screwdriver remove the screw Disconnect the connector from the heaphone board Remove the headphone board from the divider panel Power LED Board 123 ej Take Apart Pawer LED Board Power LED Board Warning This product contains high
90. nt issue in slot loading iMacs with serial numbers equal to or greater than XXX008XXXXXx Follow the LED Alignment Procedure next procedure and then fill out a Service Sticking Power Button 50 er Adjustments Repair Order Enter the adjustment part number 011 0206 Power Button LED Alignment into the appropriate section in AppleOrder ej Adjustments LED Alignment Procedure 51 Screws e Screws under viden Out ACCESS Door LED Alignment Procedure 1 Remove the four screws that secure the bottom housing to the computer ej Adjustments LED Alignment Procedure 52 2 Lift the bottom housing off the computer ej Adjustments LED Alignment Procedure 53 3 Position the iMac so that it is directly in front of you 4 Looking straight on at the inner power button determine if the LED is centered in the middle of the inner power button as shown in the graphic ej Adjustments LED Alignment Procedure 54 5 If the LED is not centered properly as shown in the top graphic use small plastic video alignment tool see bottom graphic to gently coerce the LED so that it is centered in the middle of the inner button Test to make sure that the inner button no longer sticks by pressing the inner button several times e Adjustments LED Alignment Procedure 55 7 Replace the bottom Bottom Ho using housing making sure to align
91. ntinuity test on the power supply board fuse Refer to the picture below to located the neces sary test point referenced in the following procedure Unplug the computer to take this reading Using an ohm meter touch the red and black probes to the two metal points at location F901 and check for continuity reading of O If the ohm meter registers 0 the fuse is good If the meter registers infinite the power analog video board should be replaced A bad fuse is indicative to a power analog video board problem Note To take this reading it s easiest to insert the red probe of the meter through the opening on the back side panel Power Analog Board Fuse 01 Red Probe Testing Fuse 901 for Continuity oi Troubleshooting The PMU Chip 9 The PMU Chip The PMU Power Management Unit is a microcontroller chip that controls all power functions for the computer The PMU is a computer within a computer It has memory software firmware I O two crystals and a CPU Its function is to Tell the computer to turn on turn off sleep wake idle etc Manage system resets from various commands Maintain parameter RAM PRAM Manage the real time clock Important Be very careful when handling the main logic board Remove the battery when handling the logic board so the PMU is not affected The PMU is very sensitive and touching the circuitry on the logic board can cause the PMU to crash If the PMU crashe
92. o Board clamp screw CRT Weck Screw Take Apart Divider Panel 86 14 Carefully pull the video Video Board board off the CRT neck Divider Panel 87 ej Take Apart Divider 15 Lift and remove the entire divider panel assembly off the inner bezel Note Continue with the Take Apart procedure to remove the service parts from the divider panel ej Take Apart Divider Panel 88 16 Remove the following Powe ra nalog parts to replace the tL Degauss Y ideo Board CRI divider panel shown on Side Cable aide the next page nte nna R Speaker Speaker h Fowe r LED Head pho ne Divider CD HD En ard En ard Panel Drove Carmer Take Apart Divider Panel 89 17 This is the divider panel service part number 922 4044 Power Analog Video Board 90 ej Take Apart Power nag Video Board Power Analog Video Board Before you begin discharge the CRT rest the computer on an ESD mat or other soft surface and remove the following bottom housing front outer bezel top rear housing Note This shows the power analog video board still attached to the divider panel and the side panels ej Take Apart Power Analog Video Board 91 Warning This product Mic m pho Connector contains high voltage and a Wrap To prevent serious injury review CRT safety in Bulletins Safety Degauss _ _ high va
93. o connector P501 on the power analog video board PSO1 Located at Bottom af Powe ra nalag Bo ard Side nel ej Take Apart Power Analog Video Board 95 8 Disconnect P501 and P701 on the power Power i ag 4 analog video board The Bos pd cables are located near the high voltage P701 capacitor ej Take Apart Power Analog Video Board 96 9 Onthe other side of the CRT neck disconnect the brown degauss cable P901 from the power analog video board Remove P901 from the cable clamp Cable Power Analog eo Clamp Video Boar ej Take Apart Power Analog Video Board 97 10 At the very bottom of the power analog video board near the bottom of the CRT disconnect T P902 which is part of wA 4 fae 1 the audio headphone zia i X LED speaker cable assembly er Take Apart Power Analog Video Board 98 Video Board Ground Cables 11 Disconnect the two ground cables on the video board Caution Be careful when working around the CRT neck rings If the neck rings are bumped the CRT will be knocked out of adjustment and will require replacement of the CRT ej Take Apart Power Analog Video Board 99 12 Loosen the CRT neck Video Board clamp screw CRT Weck Screw y Take Apart Power Analog Video Board 100 13 Carefully pull the video video Board board off the CRT neck ej Take
94. ogic board over the screw holes On the underside of the logic board the modem fits under the metal frame Make sure the EMI shield around the USB ports is seated properly over the ports when attaching the I O panel I O Panel 60 er Take Apart Panel Before you begin position the computer upside down resting the computer on an ESD mat or other soft surface and remove the following bottom housing EMI cover logic board I O Panel 61 lol Take Apart Screw 170 Panel 1 Screw Disconnect the cable at J12 going from the logic board to the I O panel Remove the two screws on the I O panel ej Take Apart I O Panel 62 3 Turn the logic board over and remove the modem screw ej Take Apart I O Panel 63 D Panel Rotate the logic board face up again and carefully slide the I O panel off the logic board Note As you slide the 1 O panel off the logic board support the modem with your hand so the modem doesn t fall off the logic board ej Take Apart Front Outer Bezel 64 Outer Bezel Front Outer Bezel Before you begin place the computer on an ESD mat and remove the bottom housing ej Take Apart Front Outer Bezel 65 Outer Bezel With a jeweler s screwdriver carefully remove the two tabs on the front outer bezel Refer to the next graphic for a close up of the tab removal ej Take
95. omputer on an ESD mat or other soft surface and remove the following CDO DYD e bottom housing Adapter EMI cover Boa SDRAM CD HD carrier er Take Apart CD DVD Adapter Board 34 1 Using a jeweler s screwdriver remove the two screws on the CD DVD adapter board Screws 2 Remove the adapter ils heheheh ek th hd dr TET ar MT PI board from the back of the CD ROM Ed DU EM Li Note Return the CD DVD Adapter Board ROM drive to Apple without the cables carrier or the adapter board Refer to the parts database for more information Hard Drive 35 ej Take Apart Hard Drive Before you begin position the computer upside down resting the computer on an ESD mat or other soft surface and remove the following bottom housing EMI cover SDRAM CD HD carrier CD ROM Hard Drive 36 ej Take Apart Carrier Drive Using a 1 Phillips screwdriver remove the four hard drive mounting screws Note Support the hard drive with one hand so the hard drive doesn t fall out of the carrier er Take Apart Hard Drive 37 CD HD Carrier 2 Remove the hard drive from the CD HD carrier Note Return the drives without the cables or carriers Exchange Apple hard drive modules in Apple packaging Failure to comply with this requirement may result in a packaging noncomplian
96. on the Logic Board mentioned earlier in this chapter Trickle power is present as soon as the power cord is plugged into the computer Did you measure 5 V trickle power on pin 1 of connector J9 Yes Go to the next step No Refer to the troubleshooting symptom No Power Bad logic board Check for DCO voltage at location C10 on the logic board Refer to Testing DCO Down Converter On Voltage at C10 on the Logic Board mentioned earlier in this chapter Did you measure approximately 1 2 volts Yes Go to the next step No Replace the logic board Bad internal RGB video Replace the internal RGB video cable that attaches to cable the power analog video board and to the logic board The cable is screwed to the power analog board located near the AC power plug on the power analog board If this doesn t solve the problem go to the next step Bad power analog video Replace the power analog video board Bad CHT Replace the CRT cr Troubleshooting Symptom Cure Tables Startup Problems Before the Finder Gray Screen In a Gray Screen Raster situation you will get a normal startup boot chime and the system will have a green LED The display however will have a solid gray screen with no cursor or desktop displayed Possible Cause Possible Fix Corrupted system software Boot off the system CD that came with the unit Do you See a normal screen display now Yes Reinst
97. ond time because it could crash the PMU chip WAIT ten seconds before connecting the power cord and pow ering the computer on If the computer powers on go to the next step If the computer does not power on there is some thing else wrong with the computer refer to the symptom cure chart No Power in this chapter Run MacTest Pro and return the computer to the customer Note This entire procedure resets the computer s PRAM Be sure to reset the computer s time date and other system parameter settings before returning the computer to the customer cr Troubleshooting Power On Self Test 11 Power On Self Test There is a power on self test that resides in the ROM of the iMac This test automatically runs whenever the iMac is powered on after being fully shut down the power on self test does not run if the machine is only restarted If a problem is detected during the test you will not hear a normal startup chime Instead the system will beep as explained below Refer to Error Beeps later in this chapter for instructions on how to troubleshoot and repair an iMac that sounds error beeps at startup time Following is a definition of what the error beeps at startup time signify One Beep No RAM is installed or detected Two Beeps Incompatible memory is installed The iMac ships with PC 100 SDRAM and does not accept SDRAM SO DIMMs or EDO memory Three Beeps No RAM banks passed memory testing Four or F
98. or Geometry Color iMac Color Depth Resolution OGrays 5 Show Recommended J 8 Open the Monitors amp Colors Millions ea arare control panel 800 x 600 95Hz METRIS 9 Select the Geometry icon Contrast and Brightness 9 x ej Adjustments S Correction Adjustment 47 10 Click on the Factory Settings button in the Geometry window C sae Hee furere Note Before returning the iMac to the f Helght NT dts customer display the C Position focus test pattern again Fincusiibn and verify that the focus Rotate is acceptable after all of Keystene the adjustments have Paralelogram been completed Built in Manitor Seblings Ffactary Setting Sticking Power Button 48 ej Adjustments Sticking Power Button Apple has found that the largest contributor to a stuck power button is an improperly aligned front power on LED If the front power on LED is not centered properly within the inner button the inner power button can become stuck between the LED and the inner bezel resulting in the following behavior No power inability to start up the computer Sticking Power Button 49 er Adjustments from either the front power button or the keyboard ntermittent shut down or sleep the computer will randomly shut itself off or put itself to sleep Apple has taken steps to resolve the LED alignme
99. ors 15 pin VGA connector for mirrored RGB out port better best Communication 11 MB wireless ready antenna in enclosure technology e 56K V 90 modem and Group Fax send receive compatible 5 Features 9 10 100 Mbps Ethernet RJ 45 connector for connection to either a 10Base T or 100Base TX hub networks two external USB ports 12 Mbps per port two FireWire ports 6 pin 400 Mbps better best Sound two built in stereo speakers internal microphone dual headphone jacks analog audio in out line level jacks digital audio spatializer N 2 2 AC 3 Playback bass enhancement Features 10 5 iMac Models Comparison CPU Speed Original iMac 233 MHz Rev B iMac 233 MHz 5 color iMacs 266 MHz or 333 MHz iMac iMac DV iMac DV Special Edition 350 MHz good or 400 MHz better and best models L2 Cache Original iMac 117 MHz Rev B iMac 133 MHz e 5 color iMacs 133 MHz iMac iMac DV iMac DV Special Edition 40 or 160 MHz Features 11 5 System Bus Speed Original iMac 66 MHz Rev B iMac 66 MHz 5 color iMacs 66 MHz iMac iMac DV iMac DV Special Edition 100 MHz Main Memory Original iMac 32 MB up to 128 MB Rev B iMac 32 MB up to 128 MB 5 color iMacs 32 MB up to 128 MB iMac iMac DV iMac DV Special Edition 64 MB up to 512 MB 5 Features 12 Graphics Controller Chi
100. ort that provides er Basics Overview 2 mirrored RGB out FireWire ports and digital video technology to name a few 5 New Technologies 3 New Technologies AirPort Wireless Networking The iMac iMac DV and iMac DV Special Edition computers support wireless networking using the optional AirPort wireless networking card To participate in wireless networking the system must have the following internal antenna The antenna necessary for wireless networking is already installed inside the iMac computer AirPort Card This small card about the size and shape of a credit card can be installed in the wireless networking slot inside the computer Users can purchase cards from an Apple authorized dealer or from The Apple Store New Technologies 4 5 In addition to access another computer network or Internet service provider users need to connect a wireless access device to their network This access can be an AirPort Base Station a stand alone hardware product with a wireless antenna and network modem connections or an AirPort Software Base Station software running on a wireless equipped computer FireWire FireWire is a high speed data system that lets you easily connect and disconnect external devices such as digital video DV cameras printers scanners and hard disks without restarting your computer The better and best iMac configurations include two ex
101. ou re returning the power analog video board to Apple leave the cables attached to the board Side Panels 104 ej Take Apart Side Panels Left and Rig ht Side Panels Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin discharge the CRT rest the computer on an ESD mat or other soft surface and remove the following bottom housing front outer bezel top rear housing Side Panels 105 ej Take Apart Undo the wire wraps in the top corners or the CRT Lift the degauss cable out of the way to access the side panel screws There are two screws on each side ej Take Apart Side Panels 106 3 Onthe rear of the side panels remove four screws These screws connect the side panels to the divider panel the metal chassis Side Panels ej Take Apart Side Panels 107 4 Atthe top rear of the side Left eus p panels pull each side Side r panel off the plastic pin Panel The left and right side panels are identified when viewing the computer from the Note To separate the left d panel from the right panel remove the rear bracket Otherwise lift the side panels off as a unit next graphic and separate the panels later Side Panels 108 ej Take Apart Side Panel Pull the panels out to
102. p Original iMac ATI RAGE llc Rev B iMac ATI RAGE Pro 5 color iMacs ATI RAGE Pro Turbo iMac iMac DV iMac DV Special Edition ATI RAGE 128 Pro 4x Graphics Memory Original iMac 2 MB expandable Rev B iMac 6 MB 5 color iMacs 6 MB iMac iMac DV iMac DV Special Edition 8 MB Features 13 5 Hard Disk Drive Original iMac 4 GB Rev B iMac 4 GB 5 color iMacs 6 GB iMac iMac DV iMac DV Special Edition 6 GB iMac 10 GB iMac DV or 13 GB iMac DV Special Edition CD Drive Original iMac Tray loaded CD ROM Rev B iMac Tray loaded CD ROM 5 color iMacs Tray loaded CD ROM iMac iMac DV iMac DV Special Edition Slot loaded CD ROM or DVD ROM er Basics Features 14 Data Ports Original iMac USB Rev B iMac USB 5 color iMacs USB iMac iMac DV iMac DV Special Edition USB optional FireWire Communication Features Original iMac 56K modem infrared port Rev B iMac 56K modem infrared port 5 color iMacs 56K modem iMac iMac DV iMac DV Special Edition 56K modem optional wireless ready AirPort Card Video Mirroring iMac iMac DV iMac DV Special Edition HD 15 connector for VGA output iMac DV and iMac DV Special Edition ej Basics Views 15 Views Front Side and Rear View l Panel Battar Housing Video Part Access Door RAM and AirPort Card Access Doar ej Basics Views
103. ppear to be a problem with the phone line Test the modem as explained in Testing the Modem earlier in this chapter No Report the dead phone line to the phone company There is a problem with Reseat the modem If the problem persists replace the the modem modem Modem Cannot Dial Out If there is a dial tone but the user cannot dial out with the modem refer to this section of the table The modem settings are Open the modem control panel and make sure the incorrect modem type selected is iMac Internal 56K or Apple iMac internal modem in the Earthlink setup screen the sound is On and the dialing is set to Tone At this point leave the ignore dial tone setting unselected The incorrect CCL file is Verify you have the correct CCL selected If the problem selected or it is damaged persists reinstall the CCL file There is a problem with the Can you get a normal dial tone with the modem phone line or dial tone set Yes Go to the next step tings No Some voice mail systems use a beeping dial tone to notify the user of waiting messages which can affect the modem connection Open the modem control panel and select Ignore Dial Tone The modem is loose or If you get an error message that the modem is not missing found verify that the modem is installed and properly seated If the problem persists replace the modem Service Source Take Apart iMac iMac DV iMac DV Special Edition
104. ption gt lt P gt cu and R keys after Monitor Geometry Color o iMac B Restart is selected from _ Color Depth the Special menu 7 Grays 256 Thousands amp Colors Millions EERIE Note If you don t THE restart the computer the iMac will display the previous user geometry Contrast and Brightness settings made on the O i o xx iMac 8 Open the Monitors control panel Resolution 9 Select the Geometry icon Geometry Adjustments 42 ej Adjustments Built in Monitor Seblings amp Heightwvidtts O Fincushien 3 Rotate D Keystene ParaBelogram factory Settings 10 Click on the Factory Settings button in the Geometry window 11 Close the Monitor control panel Note Rotation Parallelogram Pincushion Balance and S Correction adjustments are resolution independent Adjusting at one resolution will apply to all resolutions Simply make the changes and click the Save button er Adjustments S Correction Adjustment 43 jugi Help Gray Bars Black White Red Green Blue White Grid Black Grid Focus S Correction Adjustment 1 Open the Display Adjustment Utility and select White Grid from the Pattern menu 2 Check that all the squares on the White Grid test pattern appear equal in size If the squares look fine there is no need for this adjustment If the squares do
105. rd Modem 56 ej Take Apart Screw Panel Screw With the logic board facing right side up disconnect the cable at J12 Remove the two screws on the I O panel Modem 57 ej Take Apart Turn the logic board to the underside and remove the modem screw Modem 58 ej Take Apart D Panel Rotate the logic board right side up again Carefully slide the I O panel off the logic board Note As you slide the 1 O panel off the logic board support the modem with your other hand so the modem doesn t fall off the logic board Remove the modem from its connector slot on the underside of the logic board ej Take Apart Modem 59 0 Panel Metal Frame Logic Board Modem Replacement The I O panel and the modem are sandwiched between the logic board and the metal frame of the I O panel The metal frame fits on top of the logic board over the screw holes On the underside of the logic board the modem fits under the metal frame Make sure the EMI shield around the USB ports is seated properly over the ports when attaching the I O panel I O Panel 60 er Take Apart Panel Before you begin position the computer upside down resting the computer on an ESD mat or other soft surface and remove the following bottom housing EMI cover logic board I O Panel 61 lol Take Apart Screw 170 Panel
106. rd off the CRT neck ej Take Apart Power Analog Video Board 100 14 Holding on to the side panels lift the power analog video board from the inner bezel er Take Apart Power Analog Video Board 101 15 Remove the ten screws and pinch the two standoffs to lift the power analog board off Power Board the divider panel Ra Sta nda tt 298 irm TII me iJ ary 4 Divider Pa rel ej Take Apart Power Analog Video Board 102 16 Lift the board up and out Power nalog Video Boar off the divider panel lifting the board toward the speakers Replacement Note If you re returning the power analog video board to Apple leave the cables attached to the board er Take Apart Power Analog Video Board 103 Identifying the Rev 2 Power Analog Video Board There is a new revision of the power analog video board The part number is 661 2315 Rev 2 This board must be exchanged like for like The revised board can be identified by the presence of a switch at location SW901 located near the flyback transformer Refer to the next page for switch instructions Power Analog Video Board 104 ej Take Apart Power Supply Analog Board 661 2315 i S k Screened Switch Setting Important The switch must be set for the type of the CRT LG or CPT in the computer If the Rev 2 power analog video board or
107. ropriate position Refer to the next page for information on how to identify an LG CRT e Take Apart Power Analog Video Board 106 One way to quicky identify an LG CRT is by the black sticker located on the left side of the CRT The sticker covers the LG label Li CRT Black Sticker Covering LG Label iMac Verifying a Defective Power Analog Video Board Many of the power analog video boards returned to Apple as bad or DOA have no trouble found at the repair facility It is important to verify a defective power analog video board properly before ordering a replacement Follow the steps below to verify if the issue is due to a bad power analog video board or if something else is causing the problem Products affected iMac Slot Loading iMac Summer 2000 iMac Early 2001 e iMac Summer 2001 Procedure 1 Check for bent pins on the CRT neck see Figure 1 Remove the video board and observe the pins on the CRT neck Make sure all of them are straight If the pins are not straight carefully attempt to straighten them with a flatblade jeweler s screwdriver or needlenose pliers and test the board again Figure 1 CRT Neck Pins 073 0593 Rev A 2 Make sure the video board is properly seated on the CRT neck see Figure 2 The top picture shows the video board improperly seated the bottom picture shows it properly seated When the video board is properly seated the plastic so
108. routed through the side panel before removing A close up view of the right panel antenna is shown here Right Side Panel Carefully remove the antenna from the right side panel a Board and Cable ej Take Apart Antenna 116 3 Carefully remove the antenna from the left side panel Antenna Boar and Antenna 117 ej Take Apart Before removing the antenna from the divider panel mark the hole with a pen tip that the antenna passes through so you know which hole the antenna goes into when replacing the antenna Lift the antenna board from the divider panel Replacement Note Improper antenna routing in the side panels may cause wireless reception problems ej Take Apart Speakers 118 Left Speaker Fight Speaker Speakers Before you begin rest the computer on an ESD mat or other soft surface and remove the bottom housing The EMI coveris removed in this photo but it is not necessary to remove it to access the speakers Note Service parts package speakers as a kit A left and right speaker will be in each kit ej Take Apart Speakers 119 Speakers Disconnect the short speaker cable next to the speaker Note If you are certain a speaker is faulty the easiest removal method is to gently push the speaker down in the direction of the arrow This will bend the biggest tab there are three tabs that connects the speaker to the
109. rts may ship without this expansion board daughterboard The Ethernet functionality has been incorporated onto the logic board making the expansion board unnecessary The part number for the logic board 661 2210 did not change and boards with or without the expansion board are interchangeable Refer to TIL article 58564 for additional information e Take Apart Logic Board 46 Identifying the Version 2 350 MHz Logic Board 350 MHz Logic Board T The Version 2 board and the more recent 661 2210 logic board without the daughterboard look identical apart from the revision number on the VLSI chip Refer to the next page for a close up of the VLSI chip on the Version 2 board VLSI Chip Ies Take Apart im 300 MHz Logic Board LJ Ovisi wr ont ma 3435033909 Apple begs CAN ADA Logic Board 47 The Version 2 board 661 2317 will have a revision number of 09 or OA on the VLSI chip as shown Refer to the Parts Database and the Exploded View chapter Identifying the 350 MHz Logic Board for more information er Take Apart Logic Board 48 Identifying the 400 MHz Logic Boards There is a new version of the 400 MHz logic board for the iMac DV and iMac Special Edition The easiest way to identify the boards is by the daughterboard The new Version 2 logic board 661 2316 does not have a daughterboard Logic boards must be exchanged like for like Refer to the servi
110. s the battery life goes from about five years to about two days if the PMU is not reset Refer to the next topic Resetting the PMU on the Logic Board for the procedure Many system problems can be resolved by resetting the PMU chip The PMU reset button is located on the right side of the board refer to the logic board dia gram below Wireless Adapter Guides AirPort CD HE Adapter Cable Card Connector Connector Power Management 4 Reset Button SD RAF DIMM Slots vadami on the Underside of the Connector to Down Converter Board Logic Board Battery Grahpics ATI Chip Video Qut Port Main Processor Cif Present On Underside of Board iMac 350 MHz Logic Board Diagram cr Troubleshooting Resetting the PMU on the Logic Board 10 Resetting the PMU on the Logic Board Resetting the PMU Power Management Unit on the logic board can resolve many system problems Whenever you have a unit that fails to power up you should follow this procedure before replacing any modules 1 4 Disconnect the power cord and check the battery in the bat tery holder BT1 The battery should read 3 3 to 3 7 volts If the battery is bad replace the battery wait ten seconds and then reset the PMU refer to the next step If the bat tery is good go to the next step Press the PMU reset switch S1 once on the logic board and then proceed to step 3 Do NOT press the PMU reset switch a sec
111. s System Problems After Startup 39 CD ROM or DVD ROM Vibration CD ROM or DVD ROM vibration is typically caused by unbalanced discs when spinning at higher speeds in the internal CD ROM or DVD ROM drive This vibration may cause the drive to have difficulty reading the disc Possible Cause Possible Fix Bad CD ROM or DVD ROM Try using a known good compact disc disc cr Troubleshooting Symptom Cure Tables System Problems After Startup 40 CD ROM or DVD ROM Won t Eject CD ROM or DVD ROM disc won t eject from the slot Possible Cause Possible Fix Bad CD ROM or DVD ROM 1 Press and hold down the mouse buton on startup disc Note This only works on iMac computers with Boot ROM version 2 3 or higher To check the Boot ROM version open Apple System Profiler System Profile tab Production information Boot ROM Version 2 Try manually ejecting the disc Push a paper clip through the manual eject hole located on the right side of the CD DVD slot Refer to Ejecting a CD or DVD Disc Part 1 earlier in this chapter 3 Restart the iMac after the disc ejects If you don t restart you will not be able to mount any subsequent discs that are inserted after you use the manual eject button Note The power must be on to eject a CD or DVD disc If this doesn t solve the problem continue with the procedures on the next page cr Troubleshooting Symptom Cure Tables System Problems After S
112. s chapter If the computer has a No Power situation check the battery before replacing modules When checking the battery make sure the computer is unplugged Measure the voltage across the bat tery s BT1 positive and ground terminals The battery should read 3 3 volts to 3 7 volts If it s lower than 3 2 volts replace the battery and reset the PMU chip Note The iMac uses a lithium battery that must be disposed of in accordance with hazardous waste regulations oj Troubleshooting Ejecting a CD or DVD Disc Part 1 14 Ejecting a CD or DVD Disc Part 1 The CD DVD eject mechanism is electrical rather than mechanical on the iMac If you wish to eject a bootable CD ROM disc at startup simply hold down the mouse button until it ejects If the CD is not a bootable disc simply wait for the iMac to boot and drag the CD icon to the trash can If this fails to release the CD there is an eject button which can be activated by a small blunt object such as a paper clip The button is located on the right side of the CD slot Note that the power must be on to eject a CD using this method Note Once you use the eject button to eject a CD you must restart the iMac in order to restore functionality of the CD DVD drive If you don t you will not be able to mount any subsequent discs that are inserted after you use the emergency eject button Manual Eject Hole If the CD DVD discs still won t eject after pressing the manual eject but
113. s the ware cursor work now Yes Reinstall system software You must use the system software CD that came with the unit to get the correct version of Mac OS No Go to next step Bad USB port on the key If the mouse is connected to the keyboard connect the board mouse to one of the USB ports inside the iMac I O panel instead Does the cursor work now Yes Replace the keyboard No Replace the mouse Bad USB port on the iMac If the mouse is already connected to one of the USB ports inside the iMac I O panel switch it to the other USB port Does the cursor work now Yes Replace the logic board No Go to next step Bad mouse Replace mouse Bad logic board Replace logic board cr Troubleshooting Symptom Cure Tables System Problems After Startup 50 USB Printer Problems This troubleshooting table deals with an iMac that cannot print to an attached known good USB printer Possible Cause Possible Fix Printer is not compatible with the iMac USB bus Verify with the manufacturer of the printer that it is iMac compatible Chooser is set incorrectly Open the Chooser and verify that you have the correct printer and printer driver selected Bad printer driver or hard ware problem Use Apple System Profiler to see if it recognizes that a USB printer is connected Yes Reinstall the printer driver No The printer or its cable is malfunctioning Replace t
114. shooting Symptom Cure Tables System Problems After Startup 48 USB problems refer to symptoms or issues that may occur with external USB devices that are attached to the iMac This could include Apple and or third party USB devices Possible Cause Possible Fix USB driver missing This error message indicates the device s driver is miss ing Customers will need to check the instructions that came with the device and install the Mac OS driver The software needed for device name cannot be found Some or all of its features may not work Please refer to the device documentation to install the necessary software Lx Bad USB connector Connect the problem device directly into one of the iMac USB ports or if it s already connected to one of the iMac USB ports switch it to the other port Bad USB device Replace the USB device Bad logic board Replace the logic board cr Troubleshooting Symptom Cure Tables System Problems After Startup 49 Cursor Problems This section deals with a cursor that moves on the screen but clicking the mouse has no effect or double clicking the mouse does not open an application disk or server Possible Cause Possible Fix Corrupted PRAM Reset parameter RAM Hold down Command Option P R during startup but before Welcome to Macin tosh appears Corrupted system soft Boot off the system CD that came with the unit Doe
115. sion conflicts Does the system startup successfully with Extensions off Yes Begin adding back the system Extensions one at a time and starting up the system after each addition If the system freezes again you know that the last Extension you added is causing the problem No Go to the next step Corrupted system software Boot from the system CD that came with the unit Does or bad SDRAM the system startup successfully Yes Reinstall system software You must use the system software CD that came with the unit to get the correct version of Mac OS If the problem persists go to the next step No Reseat the SDRAM If the problem persists replace the SDRAM one DIMM atatime with known good PC 100 SDRAM Bad hard drive Can you see the hard drive using Drive Setup Yes Use Drive Setup to reinstall the software drivers for the hard drive If the problem persists use Drive Setup to reinitialize the hard drive See TIL article 22206 for Drive Setup information Warning You will lose all data on the hard drive when you reinitialize it Back up the data first if possible No Go to next step Bad hard drive cables or If you don t see the hard drive using Drive Setup cable connections 1 Check all cable connections to and from the hard drive 2 Replace the HD CD DVD data cable 3 Replace the hard drive 4 Replace the hard drive power cable 5 Replace the logic board If the problem persists go on
116. ss the side panel screws There are two screws on each side ej Take Apart Side Panels 109 3 Onthe rear of the side panels remove four screws These screws connect the side panels to the divider panel the metal chassis Side Panels ej Take Apart Side Panels 110 4 Atthe top rear of the side Left Rig ht panels pull each side Side gee nel panel off the plastic Panel The left and right side panels are identified when viewing the computer from the Note To separate the left d panel from the right panel remove the rear bracket Otherwise lift the side panels off as a unit next graphic and separate the panels later Side Panels 111 ej Take Apart Side Panel Pull the panels out to the sides a bit and then lift the side panels up and off the computer ej Take Apart Side Panels 112 6 Carefully remove the antenna wire from each side panel Right Side Panel 7 Pull the side panel off the metal divider panel If necessary repeat these steps for the other side panel ej Take Apart Antenna 113 Antenna Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin rest the computer on an ESD mat or other soft surface and remove the following antenna from the AirPort Card if
117. ssible Fix Wrong option selected in Open the Network control panel and select the Ethernet the Control Panel option Are you able to select the Ethernet option Yes Verify that you can now see devices on the network If the problem persists go to the next step No Go to next step Corrupted PRAM Reset parameter RAM Hold down Command gt Option gt lt P gt R during startup but before Welcome to Macintosh appears Corrupted system soft Boot from the system CD that came with the unit Open ware the Network control panel and switch to Ethernet Are you able to switch to Ethernet and see Ethernet devices on the network now Yes Reinstall system software You must use the system software CD that came with the unit to get the correct version of Mac OS If the problem persists go to the next step No Go to next step Bad Ethernet cable Replace the Ethernet cable with a known good cable Bad Ethernet port at the Try connecting to a different Ethernet port at the wall or wall or hub external hub Are you able to switch to Ethernet and see Ethernet devices on the network now Yes The original Ethernet port is bad Contact your network administrator No Go to next step The entire network is Are other users experiencing the same problem down Yes There is a network wide problem Contact your network administrator No Replace the logic board cr Troubleshooting Symptom Cure Table
118. st for trickle power to pinpoint the location of the problem and to determine whether or not the power supply analog board is functioning normally If you have trickle power in the system the odds are your power analog board is OK In general you should test for power at the AC outlet first Next it is best to check the logic board In this way you will be able to immediately pinpoint which module is failing The following procedures will explain how to test for power at the AC outlet and at the logic board At the AC Outlet If the unit will not power up from the keyboard first unplug the keyboard from the computer Then using a known good power cord power on the system using the power button on the front of the computer If the system powers on you can assume the AC out let is good and the problem is with the keyboard If the system still won t power on try connecting to a different AC outlet If the unit powers on this time you most likely have a problem with the AC outlet If you still have no power you may need to reset the PMU chip power manager on the logic board refer to Resetting the Logic Board in this chapter oi Troubleshooting Testing for Power 5 At the Logic Board With the iMac placed with the CRT face down on a soft surface remove the bottom housing and the EMI cover to access the logic board Testing J9 for 5 V Trickle Power on the Logic Board You will need a volt meter to test for power on th
119. t Adjust the white balance using the Display Adjustment and Display Service Utilities on the MacTest Pro CD See Video in the iMac Adjustments chapter for instructions Bad power analog video Replace the power analog video board board Bad RGB video cable Replace the internal RGB video cable that runs between the power analog board and the P301 and P302 on the video board Bad Logic Board Replace the logic board cr Troubleshooting Symptom Cure Tables System Problems After Startup 34 Garbage Video Garbage video refers to erroneous text or characters that appear on the screen Possible Cause Possible Fix Corrupted system soft Boot from the system CD that came with the unit Open ware the Monitors and Sound control panel and change the Maximum Resolution and Color Depth to their maximum settings Restart the unit Does the screen display appear normal now Yes Reinstall system software You must use the system software CD that came with the unit to get the correct version of Mac OS If the problem persists go to the next step No Go to next step Bad logic board Replace the logic board cr Troubleshooting Symptom Cure Tables System Problems After Startup 35 Intermittent Shut Down or Sleep An iMac with a sticking power button can generate unpredictable behavior The iMac randomly shuts itself off or puts itself to sleep The iMac will not start up
120. t meter Model R77 If the luminance readings are not within spec verify the meter is functioning correctly White Balance 34 ej Adjustments o Red Drive Green Drive Blue Drive Red Cutoff Green Cutoff Blue Cutoff Contrast Brightness Display Adjustment Utility 5 Click the Save button to save your settings Restart the computer and reset the parameter RAM PRAM to apply the newly saved cutoff and white balance adjustments to the Factory Setting To reset the PRAM hold down the lt Command gt lt Option gt lt P gt and lt R gt keys after Restart is selected from the Special menu ej Adjustments White Balance 35 o iMac Boe Monitor Geometry Color Color Depth Resolution Grays mE Show Recommended Millions Colors 640 x 480 117Hz 800 x 600 95Hz 1024 x 768 75Hz Contrast and Brightness 9 x Note If you don t restart the computer the iMac will display the last settings made on the iMac Open the Monitors control panel Select the Geometry icon ej Adjustments White Balance 36 9 Click the Factory Settings button Pe p Men ther Satin amp Height Widihs C Paxilien Fincushien Rotate O Keystene Paralielogram er Adjustments Geometry Adjustments 37 Geometry Adjust ments Before you begin connect the jumper adjustment too
121. tartup 41 CD ROM or DVD ROM disc won t eject from the slot Possible Cause Possible Fix Uneven edge of the CD or There are two internal levers on a slot loading CD DVD DVD drive drive that help center a CD DVD disc Some CDs and DVDs have and uneven edge which can cause enough friction to prevent the disc from ejecting If this happens follow these steps 1 Take a large paperclip and unbend it so that you can insert it into the CD DVD slot as shown below about 1 5 inches from the left edge of the slot iMac 2 With the other hand drag the disc icon on the desktop to the Trash to force the computer to eject the disc 3 When you hear the disc attempt to eject slide the paperclip to the left edge of the slot and then remove the paperclip You should feel a little resistance from the spring loaded centering lever Once the disc has been successfully ejected wipe the outside edge of the CD DVD with your hands Cleaning the edge of the disc in this way will reduce the likelihood of the disc becoming stuck again Bottom housing not aligned Remove the bottom housing and then replace the bottom properly housing Ensure the tabs on the bottom housing align with the tab slots on the front outer bezel Pay particular attention to the alignment of the center tab Refer to the take apart procedures for removing and reseating the bottom cover Bad CD ROM or DVD ROM Replace CD DVD drive mechanism drive
122. tem software is most likely the problem Reinstall system software You must use the system software CD that came with the unit to get the correct version of Mac OS with the appropriate iMac enablers No The hard drive or its software drivers are most likely the problem Can you see the hard drive using Drive Setup Yes Use Drive Setup to reinstall the software drivers for the hard drive If the problem persists use Drive Setup to reinitialize the hard drive See TIL article 422206 for Drive Setup information Warning You will lose all data on the hard drive when you reinitialize it Backup the data first if possible No Go to next step Bad cable connections or If you don t see the hard drive using Drive Setup bad hard drive Check all cable connections to and from the hard drive Replace the HD CD DVD data cable Replace the hard drive Replace the hard drive power cable Replace the logic board cr Troubleshooting Symptom Cure Tables Startup Problems Before the Finder Appears System Hangs During Boot This problem refers to a system that begins a normal startup process with a boot chime and normal display but then freezes before the Finder appears Possible Cause Possible Fix System extensions caus Boot with Extensions off by holding down the Shift key ing a conflict during startup See TIL article 14343 for more information on possible Exten
123. ter Bezel Front Outer Bezel Before you begin place the computer on an ESD mat and remove the bottom housing ej Take Apart Front Outer Bezel 65 Outer Bezel With a jeweler s screwdriver carefully remove the two tabs on the front outer bezel Refer to the next graphic for a close up of the tab removal er Take Apart Front Outer Bezel 66 2 After removing the tabs Tab remove the screws located under the tabs Outer Bezel Front Outer Bezel 67 er Take Apart Outer Bezel Note The bezel tabs fit tightly into the rear housing A good hard pull upward is required to release all the tabs 3 Insert a plastic tool underneath the bezel Pry the outer bezel tabs from the rear housing with a plastic tool As you push and pry the tool inside the bezel the side tabs will start to release Insert the tool on the left side of the bezel and repeat ZI Take Apart Front Outer Bezel 68 As the tabs start to release pull hard on the front outer bezel to release the tabs completely Top Rear Housing 69 er Take Apart Top Rear Housing Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin rest the computer on an ESD mat and remove the following bottom housing front outer bezel er Take Apart Top Rear Housing 70
124. ternal FireWire ports on the side panel 5 New Technologies 5 Output Port The iMac DV and iMac DV Special Edition computer includes a port for an external video monitor so you can mirror or show what s on the computer display to a larger audience The external monitor supports only the display sizes that are available on the internal monitor The connector for the video monitor is a three row HD15 connector DB9 15 also called mini sub D15 for use with a VGA SVGA or XGA monitor Features 6 5 Features Processor There are three shipping configurations iMac good iMac DV better and iMac DV Special Edition best 350 MHz good or 400 MHz better best Power PC G3 processor 100 MHz system and memory bus 512K L2 cache 5 Features 7 Memory 64 MB SDRAM good better 128 MB SDRAM best of PC 100 SDRAM 168 pin running at 100 MHz two DIMM slots support up to 512 MB of PC 100 SDRAM DIMMS Storage one of the following hard drives 6 GB EIDE good 10 GB EIDE better 13 GB EIDE best one of the following optical drives 24x speed slot load CD ROM drive good 4x speed slot load ATAPI DVD ROM drive better best 5 Features 8 Graphics Support ATI RAGE 128 VR 4x 2D and 3D acceleration 8 MB video SGRAM which supports 3D features and millions of col
125. the CD HD carrier 8 Push the CD DVD carrier forward so the carrier tabs go through the holes on the CD HD carrier 4 Replace the CD HD carrier screws ej Take Apart CD ROM DVD ROM 32 5 As afinal check this is a CE DOY O ROM HD Carrier front view of the CD _ ROM or DVD ROM correctly installed into the CD HD carrier EO vre Ba D ROM Drive Frant View ej Take Apart CD DVD Adapter Board 33 CD DVD Adapter Board Before you begin position the computer upside down resting the computer on an ESD mat or other soft surface and remove the following CD DYD e bottom housing Adapter EMI cover Boa SDRAM CD HD carrier ej Take Apart CD DVD Adapter Board 34 1 Using a jeweler s screwdriver remove the two screws on the CD DVD adapter board Screw s part E 2 Remove the adapter amp 1 4 TET TIT x 10 board from the back of the CD ROM DIE J Note Return the CD DVD Adapter Board ROM drive to Apple without the cables carrier or the adapter board Refer to the parts database for more information Hard Drive 35 ej Take Apart Hard Drive Before you begin position the computer upside down resting the computer on an ESD mat or other soft surface and remove the following bottom housing EMI cover SDRAM CD HD carrier e CD ROM Hard Drive 36
126. the CRT are replaced make sure to set the switch to the appropriate position Refer to the next page for information on how to identify an LG CRT o Take Apart Power Analog Video Board 105 One way to quicky identify an LG CRT is by the black sticker located on the left side of the CRT The sticker covers the LG label Li CRT Black Sticker Covering LG Label P Side Panels 106 ej Take Apart Side Panels Left and Rig ht Side Panels Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin discharge the CRT rest the computer on an ESD mat or other soft surface and remove the following bottom housing front outer bezel top rear housing Side Panels 107 ej Take Apart Undo the wire wraps in the top corners or the CRT Lift the degauss cable out of the way to access the side panel screws There are two screws on each side ej Take Apart Side Panels 108 3 Onthe rear of the side panels remove four screws These screws connect the side panels to the divider panel the metal chassis Side Panels ej Take Apart Side Panels 109 4 Atthe top rear of the side Rig ht u panels pull each side Left r side Panel panel off the plastic pin Side Panel The left and right side panels are identified when viewing the
127. the logic board Remove the modem from its connector slot on the underside of the logic board ej Take Apart Modem 59 170 Panel Metal Frame Logic Board Modem Replacement The I O panel and the modem are sandwiched between the logic board and the metal frame of the I O panel The metal frame fits on top of the logic board over the screw holes On the underside of the logic board the modem fits under the metal frame Make sure the EMI shield around the USB ports is seated properly over the ports when attaching the I O panel er Take Apart I O Panel 60 Panel Before you begin position the computer upside down resting the computer on an ESD mat or other soft surface and remove the following bottom housing EMI cover logic board I O Panel 61 ej Take Apart Screw Panel Screw Disconnect the cable at J12 going from the logic board to the I O panel Remove the two screws on the I O panel ej Take Apart Panel 62 3 Turn the logic board over and remove the modem screw ej Take Apart Panel 63 D Pane Rotate the logic board face up again and carefully slide the I O panel off the logic board Note As you slide the 1 O panel off the logic board support the modem with your hand so the modem doesn t fall off the logic board ej Take Apart Front Outer Bezel 64 u
128. the tabs on the front 8 Ifthe button continues to stick after the LED has been properly aligned you may have to lightly sand the inner bezel Sand the area surrounding the inner button to reduce the contact between the inner button and inner bezel If necessary proceed to the next topic Inner Bezel Sanding ej Adjustments LED Alignment Procedure 56 Inner Bezel Sanding 1 Remove the inner power button so that the LED is exposed as shown in the graphic 2 Using a 180 grit or higher Silicon Carbide wet dry sandpaper lightly sand the edge of the lower section of the button recess indicated by the red arrows Sand the edge until you have removed any sharp edges on the outside of the button recess The goal is to ensure that there is a er Adjustments LED Alignment Procedure 57 slight uniform radius around the entire edge of the button recess 3 Clean out the inner button recess making sure to remove any debris that may have deposited during the sanding process 4 Reinstall the inner button and spring Reimbursement Procedure To get reimbursed for this procedure fill out a Service Repair Order and enter the er Adjustments LED Alignment Procedure 58 adjustment part number 011 0206 Power Button LED Alignment into the appropriate section in AppleOrder ej Take Apart Down Converter Board 54 6 Holding onto the boards press down on the black conn
129. tment Utility Red Drive Green Drive Blue Drive Red Cutoff Green Cutoff Blue Cutoff Contrast Brightness 12 Click the Save button to save your adjustments 13 Proceed to the white balance adjustment er Adjustments White Balance 30 White Balance Before you begin make sure the cutoff is set correctly monitor has been on for at least 10 minutes jumper adjustment tool is connected to the video board refer to Jumper Adjustment Tool mentioned earlier in this section room is dimly lit er Adjustments White Balance 31 1 Openthe Display Service wig Help Utility and select the Gray Bars Gray Bars test pattern from the Pattern menu Black White Red Green Blue White Grid Black Grid Focus ej Adjustments White Balance 32 rH Display Adjustment Utility Red Drive Green Drive Blue Drive Red Cutoff Green Cutoff Blue Cutoff Contrast Brightness 2 Adjust the red green and blue drive controls until there is no predominant color er Adjustments White Balance 33 Help Gray Bars Black White Red Green Blue White Grid Black Grid Focus Select White from the Pattern menu to display the all white test pattern Hold the light meter against the center of the all white screen The screen luminance reading should be 33 bfc foot candles on the ligh
130. to the next step 1 Troubleshooting Symptom Cure Tables Startup Problems Before the Finder Appears This problem refers to a system that begins a normal startup process with a boot chime and normal display but then freezes before the Finder appears Possible Cause Possible Fix External device is bad Disconnect all external devices USB and Ethernet Then begin reconnecting these devices one at a time beginning with the keyboard and then the mouse and start up the computer after each device is connected to see if one of the external devices is causing the problem If the problem occurs after you connect a particular external device replace the device in question cr Troubleshooting Symptom Cure Tables System Problems After Startup 29 Symptom Cure Tables System Problems After Startup If you experience system problems after a successful startup i e after the Finder appears on the screen most likely the problem is not with the iMac hardware with the exception of some possible RAM issues Following are troubleshooting tables with problem symptoms that you may see after the Finder appears Possible causes for each symptom can be found in the left hand column with the corre sponding fixes in the right hand column The troubleshooting information is presented in the order of the most probable cause and fix therefore Apple strongly recommends that you carry out the troubleshooting in t
131. ton remove the bottom housing and then replace the bottom housing ensuring that the center tab of the bottom housing is properly aligned oi Troubleshooting Ejecting a CD or DVD Disc Part 2 15 Ejecting a CD or DVD Disc Part 2 There are two internal levers on a slot loading CD DVD drive that help center a CD DVD disc Some CDs and DVDs have and uneven edge which can cause enough friction to prevent the disc from ejecting If this happens follow these steps 1 Take a large paperclip and unbend it so that you can insert it into the CD DVD slot as shown below about 1 5 inches from the left edge of the slot 2 With the other hand drag the disc icon on the desktop to the Trash to force the computer to eject the disc 3 When you hear the disc attempt to eject slide the paperclip to the left edge of the slot and then remove the paperclip You should feel a little resistance from the spring loaded centering lever Once the disc has been successfully ejected wipe the outside edge of the CD DVD with your hands Cleaning the edge of the disc in this way will reduce the likelihood of the disc becoming stuck again cr Troubleshooting HFS Plus Formatted Drives 16 HFS Plus Formatted Drives The hard drive in the iMac is formatted with HFS Plus also referred to as Mac OS Extended format It is important to note that Norton Utilities version 3 5 is not compatible with HFS Plus or Mac OS Extended format and in fact can destro
132. tool on the left side of the bezel and repeat e Take Apart Front Outer Bezel 68 As the tabs start to release pull hard on the front outer bezel to release the tabs completely Top Rear Housing 69 er Take Apart Top Rear Housing Top Rear Housing Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin rest the computer on an ESD mat and remove the following bottom housing front outer bezel er Take Apart Top Rear Housing 70 1 Remove the two tabs screw caps on the top inner bezel Refer to the next page for a close up of the tab removal _1 Bezel ej Take Apart Top Rear Housing 71 2 Pry the tabs off and remove the two screws under each tab Rear using Top Rear Housing 72 ej Take Apart Position the computer face down Remove four screws and loosen the fixed screw at the top on the rear housing ej Take Apart Top Rear Housing 73 5 Position the computer j right side up Push down and pull out on the rear housing to unhook the Rear rear housing tabs that Ho using connect to the inner bezel g f T i d i D all Take Apart Top Rear Housing 74 6 Lift the top rear housing off the computer Divider Panel 75
133. ude Apple and or third party USB devices Possible Cause Possible Fix Not enough power for the The following error message will appear confirming that a USB device to function device cannot function at all due to a lack of power This lack of power depending on the device can be a result of a disconnected external power source or not enough power available from the hub the device is connected to The two corrective steps listed in the dialog box shown on the next page provide the user guidance in troubleshooting these conditions The device device name cannot operate because it needs more power than is available Tocorrect the problem you can 1 Plug the device into an electrical outlet if it has power cord 2 Unplug the device and plug it into another USE port on your computer or other device that is plugged into a power outlet USB device experiencing a Similar to the first error message this error message indicates partial lack of power a device may not completely function due to a partial lack of power and gives steps to remedy the problem The device device name may not provide all functions because it requires more power To correct the problem can 1 Plug the device inte an electrical outlet if it has power cord 2 Unplug the device and plug it inta another USB part your computer or other device that 12 plugged into a power outlet cr Trouble
134. ue with the Take Apart procedures if you are replacing the CD ROM DVD ROM or the hard drive CD ROM DVD ROM 23 ej Take Apart CD ROM DVD ROM Note The procedures for removing a CD ROM or DVD ROM are identical This procedure will reference the CD ROM Take Apart Before you begin position the computer upside down resting the computer on an ESD mat and remove the following bottom housing EMI cover SDRAM CD HD carrier ej Take Apart CD ROM DVD ROM 24 1 Using a Phillips screwdriver remove the CD HD carrier mounting screws two on each side Screws er Take Apart CD ROM DVD ROM 25 C DHO Carrier Carefully turn the CD HD drive carrier over Holding onto the CD ROM from the rear lift the CD ROM carrier out of the CD HD carrier Important Don t press or squeeze the front of the CD ROM Squeezing the front could bend the metal housing making it impossible to insert or remove a CD or DVD disc ej Take Apart CD ROM DVD ROM 26 4 Using a jeweler s screwdriver remove Screws the four screws two on each side on the CD DVD carrier 5 Lift the CD ROM from its carrier p Carrier ej Take Apart CD ROM DVD ROM 27 Screw s Seer rere ry TT t erry ee Ty 7 ere Adapter Board On the back of the CD ROM use a jeweler s screwdriver to remove the two screws on the adapter board
135. ustments on the slot load iMac ej Adjustments Adjustment Tools 3 200 1000 fc 50 290 fe 10 50 fc Model R77 Before you begin remove the 10X multiplier plate from the lens Three scales are shown on the light meter 200 1000 fc 50 250 fc 10 50 fcT Because display screen luminance typically ranges from 10 to 50 fc take readings from the bottom scale only er Adjustments Adjustment Tools 4 To measure a display screen s luminance 1 Set the scale switch to the bottom position to set up the 10 50 fc scale 2 Placethe lens against the middle of the screen and read the bottom scale cale Switch at Bottom Note When the light meter is not in use slide the scale 207 30 40 7 switch to its top position and store the meter in its protective case gm FOOTCANDLES COLOR AND TSn CORRECTED 5 o Adjustments Manufacturing Date Stamp Adjustment Tools 5 If you suspect the light meter is giving false readings verify the readings with a known good light meter or photometer Also check the age of the R77 light meter by its four digit manufacturing date stamp such as 0398 for March 1998 Caution Dropping the meter can permanently damage its accuracy A shock damaged meter might read incorrectly or its pointer may not drop to Zero ej Adjustments Adjustment Tools 6
136. vert button on the Color tab window er Adjustments Cutoff Adjustment 25 7 Select the Gray Bars test pattern from the Pattern Help menu Gray Bars Black White Red Green Blue White Grid Black Grid Focus Cutoff Adjustment 26 ej Adjustments Note This procedure should be performed in a dimly lit room 8 Lookatthe Gray Bar Test pattern The bars should have no predominant color The leftmost bar should be black The second bar from the left should be barely visible The third bar should be dark gray Cutoff Adjustment 27 ej Adjustments o Display Adjustment Utility Red Drive Green Drive Blue Drive Red Cutoff Green Cutoff Blue Cutoff Contrast Brightness 9 10 Select the Color tab window Adjust the red green and blue cutoff controls until the second bar from the left on the Gray Bars test pattern is barely visible and there is no predominant color e im Adjustments Cutoff Adjustment 28 11 If there is a predominant color in the three bars on the left continue adjusting the color controls accordingly until there is no predominant color When you are finished you should see shades ranging from black and white Note Depending on the monitor resolution selected the number of gray bars displayed will vary Cutoff Adjustment 29 ej Adjustments o Display Adjus
137. voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin discharge the CRT rest the computer on an ESD mat or other soft surface and remove the following bottom housing front outer bezel top rear housing divider panel assembly ej Take Apart Power LED Board 124 FE I Fowe Board m Connectar SS d li QU Ye Turn the divider panel over and remove the speaker to access the power LED board screw Using a stubby screwdriver remove the screw Disconnect the cable from the connector Remove the power LED board from the divider panel CRT 125 ej Take Apart CRT Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin discharge the CRT rest the computer on an ESD mat or other soft surface and remove the following bottom housing front outer bezel top rear housing divider panel assembly CRT 126 lol Take Apart 1 Remove the four CRT screws and the ground wire 2 Lift the CRT from the inner bezel Caution Be careful when working around the CRT neck rings If the neck rings are bumped the CRT will be knocked out of adjustment and will require replacement of the CRT CRT 127 ej Take Apart CRT Switch Settings on the
138. w to Identify CRT in Models With Slot Loading Disc Drives for more information ej Take Apart CRT 128 When you replace the CRT identify if the computer has an LG or Hon Hai power analog board installed Hon Hai boards have a switch at SW901 see graphic LG boards do not have a switch at SW901 and are not compatible with the CPT CRT Important The CPT CRT must be paired with a Hon Hai power analog board either 661 2465 or 661 2315 CRT 129 ej Take Apart Mia rA 2 If you have an LG board shown on the left you need to order a Hon Hai board 661 2465 or 661 2315 Set the switch on the Hon Hai board SW901 to CPT er Take Apart CRT 130 Li CRT Black Sticker Covenng Li Label Switch Settings for the LG CRT If you have an LG CRT and a Hon Hai power analog board set the switch on the Hon Hai board to LG One way to quickly identify an LG CRT is by the black sticker located on the left side of the CRT The sticker covers the LG vendor label Refer to Kbase article 95060 for more information on how to identify CRT models Microphone 131 ej Take Apart Microphone Microphone Awarning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Before you begin discharge the CRT rest the computer on an ESD mat or other soft surface and remove the fol
139. with the AC reset power cord disconnected See The PMU Chip and Resetting the PMU on the Logic Board mentioned earlier in this chapter Connect the power cord and power on the system again Do you have power to the system now Yes Test the unit with MacTest Pro and return the computer to the customer No With the AC power cord connected reset the PMU chip again Do you have power to the system now Yes The battery is likely bad check the battery No Go to the next step Troubleshooting Symptom Cure Tables Startup Problems Before the Finder Appears In a No Power situation the system is completely dead There is no LED no hard drive power and the screen is completely black Refer to Testing for Power ear lier in this chapter for instructions on how to test for power at each component refer enced in this procedure Possible Cause Possible Fix Bad power analog video Verify the fuse at F901 on the power analog board is board good Refer to Testing for Power at the Power Analog Board Fuse mentioned earlier in this chapter Did you get a 0 reading Yes Check reseat all power analog video board cable connections Make sure the video board is securely attached to the CRT neck If the No Power problem persists go on to the next step No Replace the power analog video board Bad power analog video Check for trickle power on the logic board Refer to board Testing J9 for
140. xtension and try again PRAM is corrupt Zap PRAM by holding down Option Command P and keys Serial Port Not Available message If the Modem Control Panel and or AppleWorks reports that the serial port is not available refer to this section of the table The modem is loose miss Is the modem installed ing or bad Yes Reseat the modem and try again If the problem persists replace the modem board No Install a modem and try again cr Troubleshooting Symptom Cure Tables System Problems After Startup 53 Modem Dialing Problems If the modem is having problems dialing out refer to the table below for possible fixes The table is divided into different sections each with its own symptom and cure s Find your symptom and then follow the instructions under the Possible Fix column to resolve the problem Note A good first step in troubleshooting a modem problem is to verify the modem connection as explained in Testing the Modem earlier in this chap ter Possible Cause Possible Fix No Dial Tone If the system gives you a No Dial Tone error message refer to this section of the table The phone line is not con Is the phone line connected securely to the computer nected and to the wall jack Yes Go to the next step No Reconnect the phone line at both ends and try again The phone line is dead Plug a phone into that line Do you get a dial tone Yes There does not a
141. y data on the hard drive Norton Utilities version 3 5 3 or 3 5 2 will not attempt to repair a drive formatted with Mac OS Extended format and versions 3 5 1 and earlier cannot recognize that a hard drive is in Mac OS Extended format and can result in hard drive corruption and loss of all data on the drive Note When diagnosing hard drive problems it is important to verify whether or not the customer may have used the wrong disk repair software for their drive before assuming that the problem is hardware related If you experience problems with a hard drive that has been formatted with HFS Apple Computer recommends using Disk First Aid which is included on the system software CD that ships with the iMac Disk First Aid can be used to recover data that may have been deleted by Norton Utilities See the Symantec Web site at http www symantec com nu num hfs html for more information on Norton Utilities and Mac OS Extended format Some other disk utility and disk locking programs are incompatible with Mac OS Extended format Before you attempt to use a disk utility or disk locking program make sure the version you have is compatible with Mac OS Extended format Check the documentation that came with the program or contact the manufacturer or the vendor that supplied the program Use the Get Info command to determine how a hard drive has been formatted Drives formatted with HFS will appear as OS Standard while drives form
142. ymptom cure table In the left hand column of each table are the possible causes of the symptom with the corresponding cures in the right hand column You should also follow the tables in the order presented as they represent the most logical order for cause and cure Verify whether or not the product continues to exhibit the symptom If the symptom persists try the next cure Note If you have replaced a module reinstall the original module before you proceed to the next fix For additional assistance contact Apple Technical Support oi Troubleshooting Block Diagram 2 Block Diagram The following illustration provides an overview of the iMac inter nal components and shows how they are connected System Block Diagram Digital Electronics Analog Electronics Power Supply and Video Deflection Board EMI Cover _ er Troubleshooting Power Flow 3 Power Flow Power is controlled in the iMac system by the power analog board Once the unit is plugged in power flows from the AC outlet at the wall to the AC inlet on the power analog board From there the power flows through the main cable on the power analog board to the video neck board down converter board logic board and all its attached components cr Troubleshooting Testing for Power 4 Testing for Power The iMac requires trickle voltage 5 TRKL in order to power on If you are experiencing power problems in the iMac unit you will want to te

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