Macintosh Color Classic
Contents
1. Service Source Macintosh Color Classic gt Service Source Basics Macintosh Color Classic m oi Basics Overview 1 Overview This manual contains complete repair procedures for the Macintosh Color Classic shown at left Figure Macintosh Color Classic m Service Source Specifications Color Classic m o Specifications Configurations 1 Standard Options Configurations 4 MB RAM 256K VRAM 3 5 in hard drive many sizes internal 1 4 MB floppy drive user removable logic board 9 in color display built in speaker and microphone keyboard mouse ADB and power cables system software installed on hard drive reguires System 7 1 Memory expansion kit 256K VRAM SIMM upgrade Apple lle emulation card LC ethernet card Math coprocessor Anti glare anti static CRT n o Specifications Processor 2 Processor CPU Motorola 68030 microprocessor 16 MHz Built in Paged Memory Management Unit PMMU 256 byte instruction and data caches Coprocessor Socket for optional Motorola 68882 floating point coprocessor 16 MHz Addressing 16 bit data bus 32 bit address bus 16 bit internal registers m o Specifications Memory 3 Memory RAM 4 MB of dynamic RAM on board Expandable to 10 MB 100 ns or faster SIMMs Dual SIMM expansion slot two 30 pin connectors Includes RAM disk software ROM 1 MB of main ROM on board 2 MB m2. o Upgrades Math Coprocessor 4 Adding a Motorola 68882 math coprocessor to the J13 Connector logic board in the Color Classic increases overall HULT system performance 1 Position the math coprocessor over socket U9 with the beveled edge of the chip toward the large contact connector J13 at the front of the board 2 Align the pins in the socket and gently press down the chip m o Upgrades Memory Upgrade 5 RAM SIMMs Memory Upgrade Before you begin remove the logic board Caution To prevent ESD damage to components wear a grounding wriststrap and use a grounded workbench pad Review the ESD precautions in Bulletins Safety quip Memory Upgrade 6 Note The Color Classic has 4 MB of RAM soldered on the logic board which can be expanded to 10 MB of RAM The Color Classic includes one SIMM expansion slot with two 30 pin connectors The system requires 100 ns or faster RAM SIMMs For additional information refer to Hardware Memory quip Memory Upgrade 7 J10 SIM RAM SIMM Connectors Note Both connectors in the J10 SIMM slot must be filled or both must be empty you cannot install a SIMM into just one of the two slots 1 Grasp the RAM SIMMs by the edges with the contacts pointing down Insert the SIMMs at an angle into the J10 connectors 2 Push back on the SIMMs until they snap into place mn
3. Replacement Note The plastic cable retainers on the chassis fit the width of the drive cables m Microphone Assembly 33 Microphone Assembly Microphone Assembly Before you begin e Remove the rear housing e Discharge the CRT e Remove the anode cap Warning This product contains high voltage and a high vacuum picture tube To prevent injury review CRT safety and discharge instructions in Bulletins Safety Never use a grounding wriststrap until after discharging the CRT ui Microphone Assembly 34 1 Disconnect the microphone cable between the microphone and the analog board 2 If necessary cut the tie wrap that secures the microphone cable to the degauss coil ui Microphone Assembly 35 3 Open the two plastic latches and remove the microphone assembly from the bezel Replacement Note You may need to use a flat blade screwdriver to press the microphone gasket back into the chassis m CRT 36 CRT Before you begin e Remove the rear housing Discharge the CRT Remove the anode cap Remove the analog board Disconnect the microphone cable Warning This product contains high voltage and a high vacuum picture tube To prevent injury review CRT safety and discharge instructions in Bulletins Safety Never use a ui CRT 37 grounding wriststrap until after discharging the CRT 1 Remove the four self threading
4. Yoke 35 Plastic Yoke Collar Hold the plastic yoke collar in position and carefully tighten the yoke clamp screw so that the collar cannot slip Do not overtighten the screw Replace the rear housing and switch on the computer Verify that the top and bottom edges of the picture are parallel with the top and bottom of the bezel mn all Adjustments 10 Multiplier Flate Lenz 200 1000 fc 20 250 fec 10 50 fc Light Meter Setup 36 Light Meter Setup This topic covers setup for three light meter models R77 L 248 and 246 Model R77 Apple part number 076 0310 is the newest model available Model R77 The R77 light meter is capable of reading luminance from 10 to 1 000 footcandles fc Before you begin remove the 10X multiplier plate ori Adjustments Light Meter Setup 37 200 1000 fc 50 290 fo 10 50 fc from the lens Three scales are shown on the light meter e 200 1000 fc e 50 250 fc e 10 50 fc Because display screen luminance typically ranges from 10 to 50 fc take readings from the bottom scale only ui o Adjustments Light Meter Setup 38 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 Place the lens against the Seale Switch middle of the screen and at Bottom read the bottom scale Note When the light meter 3 4 my is not in use slide
5. driver remove the two screws that secure the pushbutton board to the chassis 5 Disconnect the pushbutton board from the cable connector Replacement Note Reconnect the cable to the pushbutton board before reinstalling the board on the chassis m Flat Cable Assembly 29 Flat Cable Assembly Flat Cable Assembly Before you begin Remove the rear housing Discharge the CRT Remove the anode cap Remove the analog board Remove the chassis Remove the logic board Remove the speaker Remove the floppy drive Remove the hard drive Remove the pushbutton board ui Flat Cable Assembly 30 Awarning This product contains high voltage and a high vacuum picture tube To prevent injury review CRT safety and discharge instructions in Bulletins Safety 1 Release the plastic latch and remove the small connector bridge to the analog board from the chassis 2 Turn over the chassis quip o Take Apart Flat Cable Assembly 31 3 Push the analog board cables and small connector bridge through the access hole in the chassis Small Connector s Bridge K C Mi Analo EE i g Board Cables lt p o Take Apart Flat Cable Assembly 32 4 Release the three plastic latches and remove the large connector bridge to the logic board from the chassis 5 Remove the drive cables from the plastic cable retainers and remove the flat cable assembly
6. in the display area Horizontal Center quip Geometry 6 lt Ae Screen L Vertical Height Vertical Size Using a hex head plastic adjustment tool adjust the vertical height control until the raster height is 4 9 inches 1 16 inch or 124 5 mm 1 5 mm Verify this height If it is off repeat the vertical size adjustment and if necessary the vertical center adjustment quip o Adjustments Geometry 7 Horizontal Size Using a hex head plastic adjustment tool adjust the horizontal width control All White Screen until the raster is 6 7 inches 1 16 inch or 168 5 mm 1 5 mm L Horizontal Width quip Geometry 8 Focus 1 Using Display Service Utility display the Focus test pattern 2 Using a hex head plastic adjustment tool adjust the focus control until the Focus test pattern is as clear as possible mn Video 9 SE W i Ug Adjustment u Controls T Controls ee Caution 7 i Logic Board 1098 Voltage Chassis ir Support Video Before you begin remove the rear housing warning This product contains high voltage and a high vacuum picture tube To prevent serious personal injury or equipment damage review the CRT safety instructions in Bulletins Safety ui Video 10 Caution With the rear housing removed the metal chassis could short to the bottom o
7. Display Service Utility display the Crosshatch test pattern Using a hex head plastic adjustment tool adjust the convergence control on the CRT video board for best overall convergence ui o Adjustments Convergence 24 N S Correction H Control eee E W Correction Control N JE it E W Amp Control Using a hex head plastic adjustment tool adjust the N S correction control for best convergence of horizontal lines at the top and bottom of the screen Adjust the E W correction control for best convergence of vertical lines at the left and right sides of the screen quip Convergence 25 5 Adjust the E W amp control for best convergence of horizontal lines at the left and right sides of the screen mn Geometric Distortion 26 Adjustment Ug Controls x Controls Em N N Ee Caution i Logic Board High Voltage Chassis gq Support Geometric Distortion Before you begin remove the rear housing A Warning This product contains high voltage and a high vacuum picture tube To prevent serious personal injury or equipment damage review the CRT safety instructions in Bulletins Safety ui Geometric Distortion 27 Caution With the rear housing removed the metal chassis could short to the bottom of the logic board Before switching on system power make sure the chassis is not touching the
8. PDS Upgrades 8 PDS Card PDS Upgrades Before you begin remove the logic board Note The 96 pin processor direct slot in the Color Classic is compatible with the PDS slot in the Macintosh LC Currently Apple offers two PDS expansion cards for the Macintosh LC and Color Classic the Apple lle emulation card and the LC Ethernet card lt p o Upgrades PDS Upgrades 9 Rear Housing Dmm mm J L Lock Plate Caution Review the ESD precautions in Bulletins Safety 1 Squeeze together the latches and pull the lock plate off the inside of the access cover 2 Remove the access cover from the rear housing lt gt PDS Upgrades 10 3 Connect the expansion card to the 96 pin PDS connector J8 on the logic board J8 PDS Connector m Service Source Additional Procedures Color Classic m Battery Verification 1 Battery Verification Before you begin remove the logic board Warning If handled or discarded improperly the lithium battery in the computer could explode Review battery handling and disposal instructions in Bulletins Safety ui o Additional Procedures Battery Verification 2 Caution Review the ESD precautions Bulletins gt Safety 1 Set the voltmeter to the 10 volts DC scale 2 Hold the positive probe of the voltmeter to the Positive positive end
9. Yoke 31 Yoke Before you begin remove the rear housing warning This product contains high voltage and a high vacuum picture tube To prevent serious injury review CRT safety in Bulletins Safety Plastic Yoke Collar Yoke Clamp Screw Caution Logic Board High Voltage A Areas Chassis 7 Ta Support lt gt Yoke 32 Yoke Clamp Screw Warning Because you must make yoke adjustments from the rear of the computer use a mirror to view the computer screen Do not reach around the computer to adjust collars and rings Replacement Note If you replace the CRT you will probably have to adjust the yoke 1 Using an insulated cross tip screwdriver loosen the yoke clamp screw two or three turns ui Yoke 33 Caution With the rear housing removed the metal chassis could short to the bottom of the logic board Before switching on system power make sure the chassis is not touching the logic board To prevent the bottom of the chassis from buckling and touching the logic board you may want to support the rear corners of the chassis 2 Switch on the computer ui Yoke 34 3 With one hand grasp the plastic yoke collar and rotate it until the top and bottom edges of the picture are parallel with the top and bottom of the bezel Plastic Yoke Collar 4 Switchoff and unplug the computer 5 Discharge the CRT ui
10. emits high pitched noise Raster size too short 1 Adjust horizontal or vertical size control Refer to tall or narrow wide Adjustments chapter 2 Replace analog board Linearity bad size of Replace analog board text graphics differs at top bottom or sides of screen ui Troubleshooting Symptom Charts 7 Video Continued Raster tilted or 1 Verify that distortion is not due to environmental conditions shifted move monitor to different location Refer to Monitor Distortion in Basics chapter of any large screen monitor manual 2 Perform appropriate geometric adjustments 3 Perform yoke adjustment Refer to Yoke in Adjustments chapter 4 Replace analog board ui Troubleshooting Symptom Charts Video Continued 8 Video Continued Raster distorted 1 Verify that distortion is not due to environmental conditions barrel shaped move monitor to different location Refer to Monitor corners not square Distortion in Basics chapter of any large screen monitor stretched or manual compressed at top of 2 Perform appropriate geometric adjustments display or sides not 3 Replace analog board perpendicular 4 Replace CRT only in rare instances Raster not centered 1 Verify that distortion is not due to environmental conditions move monitor to different location Refer to Monitor Distortion in Basics chapter of any large screen monitor manual 2 Adjust horizontal or verti
11. picture tube To prevent serious personal injury or equipment damage review CRT safety and discharge instructions in Bulletins Safety ui Rear Housing 6 Using a long handled Torx screwdriver remove the four case screws If necessary remove the two security screws from the I O door Using a case spreader pull apart tool separate the housing from the chassis Carefully lift the rear housing and set it aside ui Rear Housing 7 Awarning The edges of the metal chassis may be sharp When moving the computer with the rear housing off be sure to handle the chassis carefully Replacement Note If you are replacing a damaged rear housing first remove the fan see the Fan topic in this chapter mn Analog Board 8 Analog Board Analog Board Before you begin e Remove the rear housing e Discharge the CRT e Remove the anode cap A Warning This product contains high voltage and a high vacuum picture tube To prevent serious personal injury or equipment damage review CRT safety and discharge instructions in Bulletins Safety Never use a grounding wriststrap until after discharging the CRT ui o Take Apart Analog Board 9 Ground Wire 1 Unhook the video board ground wire from the CRT grounding strap Replacement Caution When replacing the analog board be sure to securely reconnect the ground wire to the CRT grounding strap S
12. Green Blue Back L Background J ground quip Video 19 All White Screen Using Display Service Utility display the All White Screen test pattern Adjust the sub contrast control until the luminance measures 37 foot lamberts 3 foot lamberts which on the light meter is e Model R77 27 on the bottom scale e Model L 248 high end of 10 on the 10 18 scale e Model 246 27 on the red scale quip Video 20 Important Over time light tolerances can vary If you doubt your meter s accuracy verify the readings with a known good light meter or photometer mn Convergence 21 Convergence Controls P Caution Logic Board High Voltage S Areas Chassis ai Support Convergence Before you begin remove the rear housing warning This product contains high voltage and a high vacuum picture tube To prevent serious personal injury or equipment damage review the CRT safety instructions in Bulletins Safety ui Convergence 22 Caution With the rear housing removed the metal chassis could short to the bottom of the logic board Before switching on system power make sure the chassis is not touching the logic board To prevent the bottom of the chassis from buckling and touching the logic board you may want to support the rear corners of the chassis quip Convergence 23 Switch on system power Using
13. MMs math coprocessor and PDS card Replace mouse Replace logic board Retain customer s SIMMs math coprocessor and PDS card ui o Troubleshooting Symptom Charts 15 Cannot double click to open application disk or server No response to any key on keyboard Peripheral Continued 1 2 A W N Remove extra system files on hard drive Clear parameter RAM Hold down lt Command gt lt Option gt lt P gt lt R gt keys during system startup but before Welcome to Macintosh appears If mouse was connected to keyboard connect it to rear ADB port instead If mouse works replace keyboard If mouse does not work in any ADB port replace mouse Replace logic board Retain customer s SIMMs math coprocessor and PDS card Check keyboard connection to ADB port Replace keyboard cable Replace keyboard Replace logic board Retain customer s SIMMs math coprocessor and PDS card quip Troubleshooting Symptom Charts Peripheral Continued 16 Peripheral Continued Known good 1 Make sure that Chooser and Control Panel are set correctly ImageWriter or 2 Replace printer driver and system software with known ImageWriter II does good not print 3 Reset PRAM 4 Replace printer interface cable 5 Replace logic board Retain customer s SIMMs math coprocessor and PDS card Known good 1 Make sure that Chooser and Control Panel are set correctly LaserWriter does not 2 Replace printer dr
14. S card 4 Replace floppy drive cable See Flat Cable Assembly in Take Apart N m o Troubleshooting Symptom Charts 12 Internal or external hard drive does not operate Hard Drives 1 Verify that SCSI loopback card is not attached 2 Verify that internal hard drive has all three terminating resistor packs on circuit board 3 Verify that external drive is properly terminated 4 Replace hard drive data cable See Flat Cable Assembly in Take Apart 5 Replace hard drive 6 Replace logic board Retain customer s SIMMs math coprocessor and PDS card ui Troubleshooting Symptom Charts Hard Drives Continued 13 Hard Drives Continued Works with internal 1 Verify that SCSI device ID switch setting on external device or external SCSI is higher than O Also verify that ID switch setting on device but does not external SCSI device does not duplicate ID switch settings on work with both any other attached external SCSI devices 2 Replace terminator on external SCSI device 3 Replace SCSI select cable m o Troubleshooting Symptom Charts 14 Cursor does not move Cursor moves but clicking mouse button has no effect Peripheral 1 2 A Check mouse connection If mouse was connected to keyboard connect it to rear ADB port instead If mouse works replace keyboard Reset PRAM If mouse does not work in any ADB port replace mouse Replace logic board Retain customer s SI
15. aximum of main ROM PRAM 256 bytes of clock calendar parameter memory Long life lithium battery quip o Specifications Memory 4 VRAM 256K of VRAM on board Expandable to 512K of VRAM with 256K VRAM SIMM 100 ns or faster VRAM SIMM 68 pin VRAM SIMM connector m o Specifications Disk Storage 5 Disk Storage Floppy Drive Internal 1 4 MB Apple SuperDrive Hard Drive 3 5 inch internal 40 80 or 160 MB SCSI hard drive m o Specifications I O Interfaces 6 I O Interfaces Serial Two RS 232 RS 422 serial ports mini DIN 8 connectors SCSI One SCSI parallel port DB 25 connector Connects up to six external SCSI devices Apple Desktop Bus Two ADB ports mini DIN 4 connector Maximum of three ADB devices recommended Maximum current draw 500 mA Mouse draws 10 mA keyboard draws 25 mA quip o Specifications I O Interfaces 7 Sound Sound input external microphone port 8 bit monaural sound sampled at 22 or 11 KHz Monophonic sound output jack for external audio amplifier or headphones Processor Direct Slot Macintosh LC compatible 96 pin PDS expansion connector m o Specifications 1 0 Devices 8 Keyboard Mouse Microphone Speaker I O Devices Standard 80 key Apple keyboard with numeric keypad ADB connector Soft power on switch 2 5 mm travel 18 mm vertical and horizontal pitch Two level tilt adjustment Apple Desktop Bus Mouse II Built in electret om
16. cal center control Refer to Adjustments chapter 3 Replace analog board m Troubleshooting Symptom Charts 9 Floppy Drives Audio and video are 1 Replace bad disk with known good disk present but internal 2 Replace floppy drive floppy drive does not 3 Replace logic board Retain customer s SIMMs math operate coprocessor and PDS card 4 Replace floppy drive cable See Flat Cable Assembly in Take Apart Disk ejects display 1 Replace bad system disk with known good system disk shows icon with 2 Replace floppy drive blinking X 3 Replace logic board Retain customer s SIMMs math coprocessor and PDS card ui o Troubleshooting Symptom Charts 10 Unable to insert disk all the way Does not eject disk Floppy Drives Continued 1 To eject previously inserted disk insert opened paper clip into hole beside floppy drive Switch off system and hold mouse button down while switching system on to complete eject cycle Replace floppy drive Insert opened paper clip into hole beside floppy drive Switch off system and hold mouse button down while switching system on to complete eject cycle Replace floppy drive ui Troubleshooting Symptom Charts Floppy Drives Continued 11 Floppy Drives Continued Internal floppy drive 1 Replace bad disk with known good disk runs continuously Replace floppy drive 3 Replace logic board Retain customer s SIMMs math coprocessor and PD
17. driver pry open the two release tabs on the other side of the chassis and raise the chassis 4 Lift the chassis straight out of the bezel Replacement Note If you are replacing a damaged chassis first remove the speaker floppy drive hard drive logic board push button board and flat cable assembly Refer to the appropriate topics in this chapter m Pushbutton Board 25 Pushbutton Board Before you begin e Remove the rear housing e Discharge the CRT e Remove the anode cap e Remove the analog board e Remove the chassis Pushbutton Board ui Pushbutton Board 26 Awarning This product contains high voltage and a high vacuum picture tube To prevent injury review CRT safety and discharge instructions in Bulletins Safety Never wear a grounding wriststrap until after discharging the CRT quip Pushbutton Board 27 Chassis Mounting Tabs Metal M Tabs Bottom Shield 1 Raise and push out the mounting tabs along both sides of the bottom shield 2 Remove the bottom shield from the chassis 3 Set the shield aside Replacement Caution When replacing the bottom shield on the chassis make sure none of the metal tabs along the bottom rear edge of the shield is bent up toward the logic board Bent tabs could contact and short out the logic board quip Pushbutton Board 28 Cable Connector 4 Using a T 8 Torx
18. e Although upgrading the logic board is now extremely easy do not neglect to follow proper ESD precautions refer to Bulletins Safety ui o Take Apart Logic Board 2 1 If necessary remove the two security screws from the I O door i n 2 Push down the two latches until the 1 0 door snaps open Remove the door from the rear housing aur tla yji alg 1 1 x j Tread ri T 2 UE E eit r x D X D 1 0 Door quip o Take Apart Logic Board 3 3 Grasp the logic board firmly with both hands and pull it straight out of the chassis Place the logic board on a grounded workbench pad i 5 P jassa LT 1 lala ay c i i ih B Replacement Note If you are replacing a defective logic board remove the RAM and VRAM SIMMs if installed 68882 math coprocessor and PDS card Install these components on the replacement logic board Logic Board ui Logic Board 4 Replacement Caution After reconnecting the logic board make sure there are no bent metal tabs on the chassis that could contact the bottom of the logic board and short out the board mn Rear Housing 5 Rear Housing al Rear Housing No preliminary steps are required before you begin this procedure A Warning This product contains high voltage and a high vacuum
19. eshooting General 1 General The Symptom Charts included in this chapter will help you diagnose specific symptoms related to your product Because cures are listed on the charts in the order of most likely solution try the first cure first 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 cure If you are not sure what the problem is or if the Symptom Charts do not resolve the problem refer to the Flowchart for the product family For additional assistance contact Apple Technical Support m Troubleshooting Symptom Charts 2 Symptom Charts Video Screen is black too 1 Adjust contrast button on front bezel dark or too bright 2 Reset PRAM audio and drive 3 Check yoke cable connection operate 4 Perform video adjustments Refer to Video in Adjustments chapter 5 Replace analog board 6 Replace CRT Screen is bright and 1 Perform video adjustments Refer to Video in Adjustments audio is present but chapter no video information 2 Replace analog board is visible 3 Replace CRT ui Troubleshooting Symptom Charts 3 Video Continued Single vertical or Note A thin gray horizontal line may be visible across the horizontal line is bottom third of a lit screen This line is inherent in the design of displayed Trinitron monitors Do
20. etins Safety Never use a grounding wriststrap until after discharging the CRT ui Speaker 15 Remove the speaker from the two hook loop fasteners on the chassis m Floppy Drive 16 Floppy Drive Floppy Drive Before you begin e Remove the rear housing e Discharge the CRT e Remove the anode cap e Remove the analog board e Remove the speaker Warning This product contains high voltage and a high vacuum picture tube To prevent injury review CRT safety and discharge instructions in Bulletins Safety Never use a grounding wriststrap until after discharging the CRT ui Floppy Drive 17 Disconnect the floppy drive cable and push it through the hole in the plastic chassis Depress the mounting tab and pull the floppy drive straight out of the chassis mounting channel Note The mounting tab may catch beneath the front of the drive mount If this happens tug the drive straight back and it will pop over the tab quip Floppy Drive 18 Replacement Note If you are replacing a defective floppy drive remove the four carrier mounting screws and separate the drive from the plastic carrier Remove the shield from the drive mechanism Plastic Carrier m Hard Drive 19 Hard Drive Hard Drive Before you begin e Remove the rear housing e Discharge the CRT e Remove the anode cap e Remove the analog board Warning T
21. f the logic board Before switching on system power make sure the chassis is not touching the logic board To prevent the bottom of the chassis from buckling and touching the logic board you may want to support the rear corners of the chassis Replacement Note Perform the cutoff video adjustment whenever you replace the analog board ui o Adjustments Video 11 Cutoff Note Perform the cutoff video adjustment prior to adjusting white balance Switch on the system at least 10 minutes prior to performing these adjustments Gray Bars Takka 1 Using Display Service Utility display the Gray L C Bars test pattern Bezel L Contrast 2 Press the contrast up button and set screen contrast to maximum ooo goo Godo o 0 ip Video 12 O00 Red Background Green m Back T Background J ground Select the Brightness Control Panel from the Apple menu Drag the brightness control to midrange Using a hex head plastic adjustment tool set the red green and blue background controls to the full counterclockwise positions lt gt Video 13 Set the green and blue drive controls to their 3 4 position by turning the controls to their full clockwise position and then turn back 1 4 turn counterclockwise Set the sub contrast control to its full clockwise position ui o Adjustments Video 14 7 Using a hex
22. harge the CRT Remove the anode cap Remove the analog board Remove the chassis Remove the microphone assembly e Remove the CRT Fan 42 SVE Fan Fan Before you begin remove the rear housing quip o Take Apart Fan 43 Open the two latches and pull the fan straight out of the rear housing m Service Source Upgrades Color Classic m VRAM Upgrade 1 o Upgrades VRAM SIMM VRAM Upgrade Before you begin remove the logic board Caution To prevent ESD damage to components wear a grounding wriststrap and use a grounded workbench pad Review the ESD precautions in Bulletins Safety Note The Color Classic has 256K of video RAM VRAM soldered on the logic board You can increase the amount of VRAM to 512K by ui o Upgrades VRAM Upgrade 2 installing a 256K VRAM SIMM in the SIMM slot connector J9 Use only J9 SIMM Slot 100 ns or faster VRAM SIMMs 1 Grasp the VRAM SIMM by its edges with the contacts pointing down lt gt Insert the SIMM at an angle into SIMM slot J9 VRAM SIMM 2 Push back on the SIMM until it snaps into place mn Math Coprocessor 3 Math Coprocessor Before you begin remove the logic board Caution To prevent ESD damage to components wear a grounding wriststrap and use a grounded workbench pad Review the ESD precautions in Bulletins Safety quip
23. head plastic adjustment tool adjust G2 until the first bar in the test pattern is completely black and the second bar is barely discernible Gray Bars 8 Set the sub contrast control to the center position i Sub Contrast ui o Adjustments Video 15 White Balance Note Before adjusting white balance perform the cutoff video adjustment Gray Bars Make sure e The Gray Bars test ps pattern is displayed e Contrast is set to maximum Contrast i Bezel e Brightness is set to e midrange 00260009 525 000000000 ip Video 16 1 Note the predominant color 2 Using a hex head plastic adjustment tool alternately adjust the red green and blue background controls until there is no predominant color in the four darkest bars Red Background Green L Blue Back Background J ground quip Video 17 Note The darkest bar must remain completely black throughout the rest of the procedure If you notice a predominant color in the darkest bar readjust the appropriate background control 3 If necessary adjust the blue and green drive controls until there is no predominant color in the four brightest bars ui o Adjustments Video 18 4 Check the four darkest bars If necessary adjust the red green and blue background controls until there is no predominant color Gray Bars E Red Background
24. his product contains high voltage and a high vacuum picture tube To prevent injury review CRT safety and discharge instructions in Bulletins Safety Never use a grounding wriststrap until after discharging the CRT ui Take Apart Hard Drive 20 1 Disconnect the hard drive data and hard drive power cables Hard Drive 2 Push the cables through the hole in the plastic chassis Hard Drive Data Cable ui Hard Drive 21 3 Raise the mounting tab and pull the hard drive straight out of the chassis mounting channel Replacement Note For information on removing the hard drive from the carrier and returning drives cables and carriers to Apple refer to the Hard Drives manual m Chassis 22 Chassis Chassis Before you begin e Remove the rear housing e Discharge the CRT e Remove the anode cap e Remove the analog board Warning This product contains high voltage and a high vacuum picture tube To prevent injury review CRT safety and discharge instructions in Bulletins Safety Never use a grounding wriststrap until after discharging the CRT ui Chassis 23 Chassis Open the two release tabs on one side of the chassis and raise that side of the chassis To keep the side of the chassis raised insert a small flat blade screwdriver between the chassis and the bezel ui Chassis 24 3 Using a small flat blade screw
25. iver and system software with known print good 3 Reset PRAM 4 Refer to Networks and Communications manual m o Troubleshooting Symptom Charts 17 Miscellaneous Clicking chirping or thumping sound Smoke odor No video no audio and no drive operation Verify that logic board power cable is connected at J12 on logic board Replace analog board Replace logic board Retain customer s SIMMs math coprocessor and PDS card Replace analog board A W N Connect power cord Switch power on Replace power cord Replace analog board Replace logic board Retain customer s SIMMs math coprocessor and PDS card quip Troubleshooting Symptom Charts Miscellaneous Continued 18 Miscellaneous Continued Sad Macintosh icon 1 Replace bad disk with known good disk 2 Replace RAM SIMMs on logic board 3 Replace logic board Retain customer s SIMMs math coprocessor and PDS card Screen shows Sad 1 Replace RAM SIMMs on logic board Macintosh icon and 2 Replace logic board Retain customer s SIMMs math black vertical lines coprocessor and PDS card screeching sound m Service Source Take Apart Color Classic n Logic Board 1 Logic Board Logic Board No preliminary steps are required before you begin this procedure Caution You can access and remove the Color Classic logic board merely by removing the I O door at the rear of the machin
26. logic board To prevent the bottom of the chassis from buckling and touching the logic board you may want to support the rear corners of the chassis quip Geometric Distortion 28 o Adjustments Horizontal Bow or PB Pin Phase KS or Vertical Angle PR OF Note Perform the following geometric adjustments to correct distortions other than geometric center size and focus problems see Geometry warning The entire yoke assembly has very high voltage To prevent electrical shock do not touch the yoke assembly the anode wire or the yoke wires 1 To determine which control to adjust compare the display with the distortions shown ui Geometric Distortion 29 FE KS D O 0 L Pin Phase Horizontal Bow PR Vertical Angle Using a hex head plastic adjustment tool adjust the control that is appropriate for the distortion If the display is so distorted that you can t tell which adjustments to make perform the adjustments in the following sequence e Pin Phase KS e Vertical Angle PR e Horizontal Bow PB ui o Adjustments Geometric Distortion 30 4 Ifthe display is still distorted repeat the vertical angle and pin phase adjustments 5 f you can t correct the distortion replace the analog board See Analog Board in the Take Apart chapter Analog Board E m o Adjustments
27. nidirectional microphone Adjustable sound control on front of bezel m o Specifications Sound and Video 9 Sound and Video Sound Generator Monophonic 8 bit digital analog conversion using 22 KHz sampling rate for sound input capable of driving stereo headphones or other stereo eguipment through the sound jack VRAM Standard 256K of VRAM on board displays up to 256 colors Supports 1 2 4 or 8 bits per pixel Enhanced 512K of VRAM displays up to 32 000 colors Supports 1 2 4 8 or 16 bits per pixel quip o Specifications Sound and Video 10 Video Display Built in 10 in diagonal 254 mm 9 in viewable 228 mm screen Trinitron CRT 512 pixels by 384 lines 76 dpi Adjustable contrast control on front bezel m o Specifications Electrical 11 Electrical Line Voltage 90 240 VAC Universal power supply Freguency 47 63 Hz single phase Maximum Power 100 W m o Specifications Physical 12 Physical Dimensions Height 14 5 in 37 0 cm Width 9 9 in 25 2 cm Depth 12 6 in 32 15 cm Weight 22 5 23 2 Ib 10 2 10 5 kg m o Specifications Environmental 13 Operating Temperature Storage Temperature Relative Humidity Altitude Environmental 50 104 F 10 40 C 40 to 116 F 40 to 47 C 20 95 noncondensing 0 15 000 ft 0 4722 m m Service Source Troubleshooting Color Classic m o Troubl
28. not replace modules Otherwise Replace analog board 2 Replace CRT Predominant color 1 Perform video adjustments Refer to Video in Adjustments tint or color cannot be chapter adjusted 2 Replace analog board 3 Replace CRT if red green or blue cannot be turned off using appropriate controls ui Troubleshooting Symptom Charts 4 Video Continued Picture breaks into Replace analog board diagonal lines or picture rolls vertically or horizontally Out of convergence 1 Perform convergence adjustment Refer to Convergence in color bleeds from Adjustments chapter text or lines 2 Replace analog board 3 Replace CRT Black screen spots Replace CRT burnt phosphors ui Troubleshooting Symptom Charts 5 Video Continued Screen jitters or 1 Verify that adjacent computer equipment is properly flashes grounded Move electrical devices away from monitor Temporarily shut off all fluorescent lights in area 2 Check that all ground cables are secure 3 Disconnect internal hard drive and floppy drive 4 Replace analog board Out of focus 1 Perform focus adjustment Refer to Focus in Adjustments chapter 2 Replace analog board 3 Replace CRT only if one part of display remains out of focus despite adjustment of focus controls to their limits ui Troubleshooting Symptom Charts 6 Video Continued Flashing or wavy Replace analog board screen or monitor
29. of the Probe battery and the negative probe to the negative end of the battery 3 If the battery voltage is below 3 0 volts replace the battery Refer to Battery Replacement in this chapter m Battery Replacement 3 UUUUUUUU Battery Battery Replacement Before you begin remove the logic board Warning If handled or discarded improperly the lithium battery in the computer could explode Review battery handling and disposal instructions in Bulletins Safety Caution Review the ESD precautions in Bulletins Safety ui Battery Replacement 4 Battery Holder Insert a small flat blade screwdriver into the top of the battery holder cover and gently push down and out with the screwdriver to release the tab Repeat on the other end and remove the cover from the battery holder Grasp the battery and remove it from the holder quip Battery Replacement 5 Return the battery to Apple for proper disposal For information on battery packaging and labeling refer to instructions in Bulletins Safety mn Service Source Adjustments Color Classic m Geometry 1 Ug Ds Adjustment i Controls T Controls ee Caution 7 i Logic Board 1098 Voltage Chassis ir Support Geometry Before you begin remove the rear housing warning This product contains high v
30. oltage and a high vacuum picture tube To prevent serious personal injury or equipment damage review the CRT safety instructions in Bulletins Safety ui Geometry 2 Caution With the rear housing removed the metal chassis could short to the bottom of the logic board Before switching on system power make sure the chassis is not touching the logic board To prevent the bottom of the chassis from buckling and touching the logic board you may want to support the rear corners of the chassis Note The controls on this monitor require a short hex head plastic tool to make adjustments If the tool quip Geometry 3 is long or too thin it will be too flexible which will make fine adjustments difficult Use a short rigid All White Screen hex head plastic tool to minimize flexing A Warning Do not use metal alignment tools they are a shock hazard 1 Switch on system power 2 Using Display Service Utility display the All White Screen test pattern quip Geometry 4 Vertical Center Using a hex head plastic adjustment tool adjust the All White Screen vertical center control until the raster is centered top to bottom in the display area vS HS FR Oo 0 O Vertical Center ui Geometry 5 Horizontal Center Using a hex head plastic adjustment tool adjust the All White Screen horizontal center control until the raster is centered side to side
31. rvice Source Exploded View Color Classic m Exploded View 1 Exploded View CRT M kin E icrophone 661 0004 922 1802 661 0024 Australian 661 0022 European Degauss Bracket 922 1818 Screw 4 022 1816 E Fan Rear 922 1803 Housing 9224814 f Screw 4 amp ionar l 922 1815 N dics Gover Shield 805 0137 Security gt Screws Y Access Cover Rear Case 815 1154 Speaker 922 1801 Board m uel K 661 1830 1 MC Screw 2 E A Push Button _ Front Bezel 922 1811 Plate 922 1813 A 22 Analog Power Supply 661 0732 Floppy Drive 661 0474 Floppy Drive Carrier 922 1807 Hard Drive 2 661 0216 40 MB Si 5 Screw 4 pust 922 1800 Chassis 922 1809 j Flat Cable Assembly 922 1804 Bottom Shield 922 1810 lt u gt
32. screws that secure the CRT to the bezel 2 warning Never touch the anode or grasp the neck of the CRT to remove it from the bezel The neck of the CRT breaks easily and the anode may retain high voltages Lift the CRT straight out of the bezel and place the CRT facedown on the ui CRT 38 protective workbench pad Warning If you need to dispose of the CRT refer to CRT disposal instructions in Bulletins Safety Replacement Note If you are replacing a defective CRT first remove the degauss coil see the next topic mn Degauss Coil 39 Degauss Coil Degauss Coil Before you begin e Remove the rear housing Discharge the CRT Remove the anode cap Remove the analog board Disconnect the microphone cable e Remove the CRT Warning This product contains high voltage and a high vacuum picture tube To prevent injury review CRT safety and discharge instructions in Bulletins Safety Never use a ui o Take Apart Degauss Coil 40 grounding wriststrap until after discharging the CRT 1 Remove the degauss coil cable from the tie wrap at the side of the CRT yoke 2 Lift the degauss coil with attached brackets over the neck of the CRT Replacement Note When replacing the degauss coil be sure to reattach the ground strap to the degauss bracket m Bezel 41 Bezel Bezel To remove the bezel Remove the rear housing Disc
33. the scale W 0 K switch to its top position W and store the meter in its protective case eem TTT apy FOOTCANDLES COLON AND TSA CORRECTED HANES A Important If you suspect the as j light meter is giving false lt gt all Adjustments Manufacturing Date Stamp Light Meter Setup 39 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 Light Meter Setup 40 ID 111213 1415 IB 17 18 Model L 248 1 Press the red button on the back of the light meter If the reading is out of the red area replace the battery 2 Move the side switch to its upper position so that the scale reads 10 through 18 3 Uncover the lens of the meter 4 Placethe lens against the middle of the screen and press the read button to read the scale quip oi Adjustments Light Meter Setup 41 Lens Swivel Head Scale Model 246 1 Remove the metal slide if installed from the top of the light meter 2 Install the white lens with the red dot 3 Rotate the swivel head so the lens of the meter faces the monitor Place the lens against the middle of the screen and read the scale mn Se
34. witching on system power without reconnecting the ground strap could damage components ui Analog Board 10 erty che uM PITE Note If sealant holds the video board in place cut the sealant with an art knife Carefully pull the video board straight off the neck of the CRT ui Analog Board 11 i Micr ophone Cable Using a flat blade screwdriver release the connector latch and disconnect the degauss cable from analog board connector BP2 Disconnect the yoke cable from analog board connector BD1 Disconnect the two halves of the microphone cable ui Analog Board 12 Note When removing the analog board be careful not to damage the speaker cable that is connected beneath the analog board Pull out the analog board approximately two inches and align the edge of the board with cutouts in the plastic guide Lift out the analog board and place it on the workbench pad lt p Analog Board 13 Disconnect the two halves of the speaker cable located beneath the analog board Place the analog board on a grounded workbench pad m Speaker 14 Speaker Before you begin e Remove the rear housing e Discharge the CRT e Remove the anode cap e Remove the analog board Warning This product contains high voltage and a high vacuum picture tube To prevent injury review CRT safety and discharge instructions in Bull
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