SERVICE MANUAL - Wiki Karat
Contents
1. Method to place the Cassette Holder in the tape loaded position without a cassette tape 1 Disconnect the AC Plug 2 Remove the Top Case and Front Assembly 3 Turn the LDG Belt in the appropriate direction shown in Fig M1 Release the locking tabs shown in Fig M1 and continue turning the LDG Belt until the Cassette Holder comes to the tape loaded position Allow a minute or two to complete this task Top View Moving guide T preparation Eject Position Moving guide S preparation Eject Position SS AKZ M Push the tape to load it Push the locking tab gently to unlock when loading without a cassette Fig M1 Bottom View 2 3 1 D5P4HSMA 1 Tape Interchangeability Alignment Note To do these alignment procedures make sure that the Tracking Control Circuit is set to the preset position every time a tape is loaded or unloaded Refer to page 2 3 4 procedure 1 C step 2 Equipment required Dual Trace Oscilloscope VHS Alignment Tape FL6NS8 Guide Roller Adj Screwdriver Flat Screwdriver Purchase Locally Note Before starting this Mechanical Alignment do all Electrical Adjustment procedures Flowchart of Alignment for tape traveling Loading Use a blank tape Adjust the height of the Guide Rollers Supply side and take up side Use a blank tape Page 2 3 3 Check to see that the tape is not creasing and that there is no slack on the supply and take up side Guide R2. HI DM12H L 6 mt 1123 22 Wom B DM2A 69 L7 LET Ta PuerAeembyTH 8 DM2H DM13H 1 DM2H DM13H 1 Refer to Alignmen 27 Cam Gear A HI 3 DM13H 2 En or TS s TR Gear Sping JB DMIA 00 0 0 0 0 p ___ 73 edo ______ _____ e der amp ssemBy H DWIRIDMMH NES Bs 28 B DMERDMMH PS 2 4 1 U29PHSDA STEP START REMOVAL INSTALLATION LOC ING PART LN ADJUSTMENT No No UNLOCK RELEASE CONDITION UNPLUG DESOLDER Loading Arm SP HDI mpm pec eme uum fea B8 TLevrHoder ___ oms LH 6 514 5 T oma oma 7T DMIROMHH PIE A i owes I Preparation di a T pun E Preparation DSL ______ to a Ws W He Oeanerawemby T omm oma _ E _____ 1 2 3 4 5 6 7 1 Follow steps in sequence When reassembling follow the steps in reverse order These numbers are also used as ide
3. SLIDER TU MK12 OVM101172F SLIDER SP MK12 OVM101182K CLEANER LEVER MK10 0VM304413 CLEANER ROLLER MK9 OVM410032C CL POST MK10 OVM411114 PINCH ARM A ASSEMBLY 5 MK12 1VSA12881 PINCH SPRING MK12 OVM414644 M BRAKE SP ASSEMBLY HI MK12 or OVSA13655 M BRAKE SP ASSEMBLY HI MK14 1VSA13333 M BRAKE TU ASSEMBLY HI MK12 OVSA13449 TENSION SPG 3002645 MK12 5 OVM414221G LOCK LEVER SPRING MK10 OVM411110 CASSETTE PLATE 1VM220271 LOCK LEVER MK12 0 414095 BAND BRAKE SP MK12 5 1VM320582 MODE LEVER HI MK12 5 0VM101352 CAM GEAR A HI MK12 0 101176 MODE GEAR LM 12 0VM204236 C DOOR OPENER MK12 0VM305719 T LEVER HOLDER MK12 OVM305729C WORM HOLDER MK12 0 203767 REEL WASHER 5 2 1 0 5 0 410058 S BRAKE SPRING HI MK12 OVM414899 PS W 6 2 55 0 5 0 402629 SCREW RACK MK14 0VM411535B REEL WASHER 5 2 1 0 5 0 410058 PS W CUT 1 6X4 0X0 5T OVM408485A REV BRAKE SPG HI MK12 0VM414943 TG POST ASSEMBLY MK10 0VSA11012 LDG BELT MK11 0 412804 CLEANER ASSEMBLY MK10 0 5 11161 FF ARM HI MK12 0VM306183 REV SPRING MK1 1 0 412555 RACK ASSEMBLY MK14 1VSA11842 MOTOR PULLEY U5 OVM403205A LOADING MOTOR RF 500TB 12560 or MMDZB12MF003 LOADING
4. Fig DM8H 2 pin of chassis Groove of Installation of 13 and 12 Press both 12 and 13 till the Chassis groove of chassis pin appears and adjust 13 to the notch of Install 11 and 10 while holding 12 Install pin of 12 in groove of 27 Refer to Fig DM8H 1 Refer to Fig B in the direction of the arrow while pressing 12 chassis Then turn 13 a little Refer to Fig C Hook spring P 3 up to 12 and 13 then install them to the specified position so that 12 will be floated slightly while holding 12 and 13 Refer to Fig A U29PHSDA 2 4 6 Pin on 22 Fig DM12H OKA a A 9 mS 0 VAN V A TH amp NIA y Position of pin on 22 I T T LL 024 o 0 25 NC vir f 2 EN Y YY 0 BSN NY 259 M Installation position of Cap Belt View for A U29PHSDA 2 4 7 Installation of 26 Position of Mode Lever when installed Pin of 37 Pin of 33 Pin of 36 Bottom View Align 26 and 27 as shown First groove on 27 First tooth on 47 When reassembling 27 meet the first groove on 27 to the first tooth on 47 as shown Fig DM13H 2 n L T o LL Refer to the Alignment Fig DM14H U29PHSD
5. SP Assembly Last Tooth Alignment 2 Loading Arm TU Assembly Most inside teeth of Mode Gear Mode Gear Fig AL2 Alignment 3 Cam Gear A HI Rack Assembly Install the Rack Assembly so that the first tooth on the gear of the Rack Assembly meets the first groove on the Cam Gear A HI as shown in Fig ALS Cam Gear Alignment 3 Top View First tooth NN 7 AAD Ps 7 First groove G Rack Assembl on the Cam Gear 9 80 Fig AL3 U29PHSAPM DECK EXPLODED VIEWS Deck Mechanism View 1 Description e o Floil G 684G or Multemp MH D Blue grease 4A 4444 SLIDUS OIL 150 P E E 1 o 0 i 7 5 e A Y rw A4 AUS VA LN gt whos C M gt Top View Lubricating Point Chassis Assembly Chassis Assembly Some Ref Numbers are not in sequence Bottom View Lubricating Point U29P4HSDEX 2 6 1 Deck Mechanism View 2 c Q o o e Floil G 684G or Multemp MH D Blue grease 4 44 4 SLIDUS OIL 150 SANKOUL FG84M Yellow grease Bottom Side Grease point Bottom Side Grease point Some Ref Numbers are not in sequence U29PAHSDEX 2 6 2 Deck Mechanism View 3
6. DECK MECHANISM Before following the procedures described below be sure to remove the deck assembly from the cabinet Refer to CABINET DISASSEMBLY INSTRUCTIONS All the following procedures including those for adjustment and replacement of parts should be done in Eject mode see the positions of 44 and 45 in Fig DM1H on page 2 4 3 When reassembling follow the steps in reverse order p REMOVAL INSTALLATION ING ADJUSTMENT No No UNLOCK RELEASE CONDITION UNPLUG DESOLDER LUI m jGudeHodea T LER Assembly 3 2 T J S1A L0 ert em 8 4 JLokteer T DMSH o Loading Motor DM1H DM7H ns Assembly 2 S 3 9 Head Assembly DM1H DM7H TR T DM1H DM8H 1 P 2 Assembly 11 10 DM1H DM8H 1 S 4A L 4 uL uM DM8H 1 Ni Im m Pinch Arm A DM1H DM8H 1 ia Legem FE Head DMIH DM9H 5 64 1 tel E Slider Sha T DMoH pes o o We COieleerSP U8 ner CDrive Lever Ty T enea UIS S Capstan Motor B DM2H DMIIH NS8 CapBet CenterGea B DMizH 122 22 F Brake Assembly HI
7. Description e o o Floil G 684G or Multemp MH D Blue grease 4 44 4 SLIDUS OIL 150 B303 N 8514 Some Ref Numbers are not in sequence U29PAHSDEX 2 6 3 Description CYLINDER ASSEMBLY MK12 5 PAL 6HD or Part No N236CCYL DECK PARTS LIST CYLINDER ASSEMBLY MK12 5 PAL 6HD V N236DCYL LOADING MOTOR ASSEMBLY MK14 1VSA12912 SLIDE PLATE MK12 5 0 416429 PULLEY ASSEMBLY HI MK12 OVSA13501 MOVING GUIDE S PP MK12 5 1VSA12887 MOVING GUIDE T PP MK12 5 1VSA12886 LOADING ARM TU ASSEMBLY MK12 1VSA12880 LOADING ARM SP ASSEMBLY MK12 1VSA12879 AC HEAD ASSEMBLY MK12 5 1VSA12888 TAPE GUIDE ARM ASSEMBLY MK12 5 1VSA12889 CAPSTAN MOTOR HI 288 VCZC1301 N9688CML CAP BELT MK10 0VM411138 FE HEAD MK12 HVFHP0047A or 007 FE 12 VTR 1X2ERS1 1 155 or DHVECO1TEO005 HEAD FE VTR 1X2ERS11 167 DHVECO1TEO006 PRISM MK10 0VM202870 BRAKE ASSEMBLY HI MK12 0 5 13447 WORM MK12 0 414091 PULLEY MK12 OVM414330B IDLER ASSEMBLY HI MK12 1 5 12903 TG CAP MK6 OVM407664C C DRIVE LEVER TU MK12 0 203773 DOOR OPENER MK12 OVM203751C C DRIVE SPRING MK12 414145 GUIDE HOLDER MK10 0VM304920
8. A 2 4 8 Fig DM17H S 02227 D 2 SN L LO T LL Fig DM16H U29PHSDA 2 4 9 ALIGNMENT PROCEDURES OF MECHANISM The following procedures describe how to align the individual gears and levers that make up the tape loading unloading mechanism Since information about the state of the mechanism is provided to the System Control Circuit only through the Mode Switch it is essential that the correct relationship between individual gears and levers be maintained All alignments are to be performed with the mech anism in Eject mode in the sequence given Each procedure assumes that all previous procedures have been completed IMPORTANT If any one of these alignments is not performed prop erly even if off by only one tooth the unit will unload or stop and it may result in damage to the mechanical or electrical parts Alignment points in Eject Position Top View Alignment 3 y MAEA A TNN EN N Alignment 2 2 5 1 Alignment 1 Loading Arm SP and TU Assembly Install Loading Arm SP and TU Assembly so that their triangle marks point to each other as shown in Fig AL2 Alignment 2 Mode Gear Keeping the two triangles pointing at each other install the Loading Arm SP Assembly so that the last tooth of the gear meets the most inside teeth of the Mode Gear See Fig AL2 Triangle Marks Loading Arm pes
9. ES Explanation of alignment for the tape to correctly run starts on the next page Refer to the information below on this page if a tape gets stuck for example in the mechanism due to some electrical trouble of the unit Service Information A Method for Manual Tape Loading Unloading To load a cassette tape manually il 2 3 To Disconnect the AC plug Remove the Top Case and Front Assembly Insert a cassette tape Though the tape will not be automatically loaded make sure that the cassette tape is all the way in at the inlet of the Cassette Holder To confirm this lightly push the cassette tape further in and see if the tape comes back out by a spring motion just as much as you have pushed in Turn the LDG Belt in the appropriate direction shown in Fig M1 for a minute or two to complete this task unload a cassette tape manually 1 Disconnect the AC plug 2 Remove the Top Case and Front Assembly Make sure that the Moving guide preparations are in the Eject Position Turn the LDG Belt in the appropriate direction shown in Fig M1 until the Moving guide prepara tions come to the Eject Position Stop turning when the preparations begin clicking or can not be moved further However the tape will be left wound around the cylinder Turn the LDG Belt in the appropriate direction con tinuously and the cassette tape will be ejected Allow a minute or two to complete this task B
10. MOTOR M31E 1 R 14 7441 MMDZB12MMO009 CLUTCH ASSEMBLY HI MK12 OVSA13450 C DRIVE LEVER SP MK12 0VM203772 SLIDER SHAFT MK12 0VM305762B GEAR HI MK12 20060412 0VM305755 Description Part No B565 SENSOR GEAR HI MK12 OVM305756 B567 PINCH ARM B ASSEMBLY MK12 5 1VSA12890 B568 BT ARM MK12 OVM305728 B571 P S W CUT 1 6X4 0X0 5T OVM408485A B572 P S W CUT 1 6X4 0X0 5T OVM408485A B573 REEL S MK11 OVM203436 B574 REEL T MK10 OVM202872C B578 TR GEAR A MK10 04440 B579 TR GEAR B MK12 OVM305900 B580 TR GEAR C MK12 OVM305743A B581 CENTER GEAR MK1 1 OVM305081 B582 TR GEAR SPRING MK10 0 411187 B583 CAM WASHER MK12 0VM414741 B585 PSW 317505 MK11 OVM413663 B587 TENSION LEVER ASSEMBLY MK12 1VSA12878 B590 BRAKE ARM TU MK12 OVM203752E B591 BAND BRAKE TU MK12 OVM305724C B592 TG POST MK10 OVM411108E L1051 SCREW B TIGHT M2 6X6 PAN HEAD GPJB9060 L1053 SCREW S TIGHT M2 6X8 WASHER HEAD GCJS9080 L1151 SEMS 2 6 4 PAN HEAD CPJ39040 L1191 S TIGHT M2 6X8 WASHER HEAD GCJS9080 L1324 S TIGHT M3X6 BIND HEAD GBJS3060 11322 SCREW B TIGHT M2 3X4 BIND HEAD GBJBY040 L1341 SCREW P TIGHT M2X6 PAN HEAD GPJP2060 1406 AC HEAD SCREW MK14 OVM410964A L1450 SCREW SEMS M2 6X5 PAN HEAD CPJ39050 11466 SCREW S TIGHT M2 6X6 BIND HEAD GBJS9060 L1467 SCREW M2 6X5 WASHER HEAD SCJ39050 N25E1FLDPL N25E1FL 2006 05 10
11. SERVICE MANUAL MK14 Deck Mechanism Section Deck Mechanism Part No N25E1FL TABLE OF CONTENTS Standard Maintenance Service Fixture and Tools Mechanical Alignment Procedures Disassembly Assembly Procedures of Deck Mechanism Alignment Procedures of Mechanism Deck Exploded Views Deck Parts List IMPORTANT SAFETY NOTICE Proper service and repair is important to the safe reliable operation of all Funai Equipment The service procedures recommended by Funai and described in this service manual are effective methods of performing service operations Some of these service special tools should be used when and as recommended It is important to note that this service manual contains various CAUTIONS and NOTICES which should be carefully read in order to minimize the risk of personal injury to service personnel The possibility exists that improper service methods may damage the equipment It also is important to understand that these CAUTIONS and NOTICES ARE NOT EXHAUSTIVE Funai could not possibly know evaluate and advice the service trade of all conceivable ways in which service might be done or of the possible hazardous consequences of each way Consequently Funai has not undertaken any such broad evaluation Accordingly a servicer who uses a service procedure or tool which is not recommended by Funai must first use all precautions thoroughly so that neither his safety nor the safe operation of the equipment will be je
12. b Wy ES MAA VO VA ys 262 5 Is 50 Wd CI Jy BOY V uU VOC NG ry 4 7 n NS N e 3 slide and pull up the right J side on 2 to release Pin A and Pin B from the slots A Then remove Pin C and Pin D on 2 from First while pushing the locking tab as the slots B as shown shown in the right U29PHSDA 2 4 4 Fig DM8H 1 lt A N 1 7 Bs AS N When reassembling 10 and 12 confirm that pin of 10 and pin of 12 are in the groove of 27 as shown Groove of 27 27 1 4 while Pin of 12 holding 12 with a finger holding 12 and Unhook spring Loosen a finger remove 11 Remove screw Release View for A uu gt Fig DM6H Fig DM7H Lead with White Stripe View for A Desolder from bottom P Hed Stripe Lead with View for A 1 0 Desolder from bottom U29PHSDA 2 4 5 Fig DM9H Fig DM10H 5 z v NS N N y gt Qa lt 7 N A A as a D 9 A 2 NS a i Z bol LY 4 S 4 OS 6 X URS exe C Y m DN SA DA SDA uin 9 LJ N 5 NN N EZ L2 gt in of 12 Eu DOMI Groove of 27 Fig C
13. by slightly pressing it against the head tip turn the upper drum to the right and to the left Notes 1 The video head surface is made of very hard material but since it is very thin avoid cleaning it vertically 2 Wait for the cleaned part to dry thoroughly before operating the unit 3 Do not reuse a stained head cleaning stick or a stained chamois cloth Do Not touch gt With your bare Q D Q D Cylinder Do Not M E Cleaning Stick 2 1 2 Cleaning of ACE Head Clean the head with a cotton swab Procedure 1 Remove the top cabinet 2 Dip the cotton swab in 90 ethyl alcohol and clean the ACE Head Be careful not to damage the upper drum and other tape running parts Notes 1 Avoid cleaning the ACE Head vertically 2 Wait for the cleaned part to dry thoroughly before operating the unit or damage may occur U29PHSMEN SERVICE FIXTURE AND TOOLS EEMS E J 2 J 3 J 4 Alignment Tape FL6A Head Adjustment of ACE Head J 1 2 Alignment Tape FL6N8 Azimuth and X Value Adjustment of ACE Head 2 Head model Adjustment of Envelope Waveform FL6NS8 4 Head model Guide Roller Adj Screwdriver Available Guide Roller Locally Mirror Available Tape Transportation Check Locally Azimuth Adj Screwdriver 4 Available ACE Head Height Locally Flat Screwdriver Available X Value Locally 2 2 1 U29PFIX MECHANICAL ALIGNMENT PROCEDUR
14. ig M9 4 If the envelope is as shown in Fig M8 adjust the height of Guide Roller 3 Refer to Fig M3 so that the waveform looks like the one shown in Fig M9 5 When Guide Rollers 2 and 3 Refer to Fig M3 are aligned properly there is no envelope drop 2 3 4 either at the beginning or end of track as shown in Fig M9 Dropping envelope level at the beginning of track Dropping envelope level at the end of track Envelope is adjusted properly No envelope drop Note Upon completion of the adjustment of Guide Rollers 2 and 3 Refer to Fig M3 check the X Value by pushing the CH UP or DOWN buttons on the unit alternately to check the symmetry of the enve lope Check the number of pushes to ensure preset position The number of pushes of the CH UP button on the unit to achieve 1 2 level of envelope should match the number of pushes of the CH DOWN button on the unit from center If required redo the X Value Alignment D5P4HSMA 1 D Azimuth Alignment of Audio Con trol Erase Head Purpose To correct the Azimuth alignment so that the Audio Control Erase Head meets tape tracks properly Symptom of Misalignment If the position of the Audio Control Erase Head is not properly aligned the Audio S N Ratio or Frequency Hesponse will be poor 1 Connect the oscilloscope to the audio output jack on the rear side of the deck 2 Playback the alignment tape FL6NS8 and confirm that the audio s
15. ignal output level is 8kHz 3 Adjust Azimuth Adj Screw so that the output level on the AC Voltmeter or the waveform on the oscillo scope is at maximum Fig M6 Note Upon completion of the adjustment of Azimuth Adj Screw check the X Value by pushing the CH UP or DOWN buttons on the unit alternately to check the symmetry of the envelope Check the number of pushes to ensure preset position The number of pushes of the CH UP button on the unit to achieve 1 2 level of envelope should match the number of pushes of the CH DOWN button on the unit from center If required redo the X Value Alignment 1 E Checking and Alignment of Tape Path during reversing Purpose To make sure that the tape path is well stabilized dur ing reversing Symptom of Misalignment If the tape path is unstable during reversing the tape will be damaged Note Do not use an Alignment Tape for this proce dure If the unit is not correctly aligned the tape may be damaged 1 Insert a blank cassette tape into the tray and set the unit to REV Then confirm if the tape has been curled up or bent at the Take up Guide Post 4 or HEV Post 5 Refer to Fig M11 and M12 2 3 5 2 When the tape has been curled up or bent turn the alignment screw to adjust the height of REV Post Refer to Fig M11 and M13 Correct Incorrect Tape mi x C E ih Take up Guide Post Assembly D5P4HSMA DISASSEMBLY ASSEMBLY PROCEDURES OF
16. ntification location No of parts in the figures 2 Indicates the part to start disassembling with in order to disassemble the part in column 1 3 Name of the part 4 Location of the part T Top B Bottom R Right L Left 5 6 6 Figure Number Identification of parts to be removed unhooked unlocked released unplugged unclamped or desoldered P Spring W Washer C Cut Washer S Screw Unhook Unlock Release Unplug or Desolder e g 2 L 2 two Locking Tabs L 2 7 Adjustment Information for Installation Refer to Deck Exploded Views for lubrication 22 Brake Assembly is not used 2 head model 2 4 2 U29PHSDA Top View 7 145 49 9 eX S On 10 _ lt Bottom View 22 28 20 2 4 3 U29PHSDA Fig DM5H confirm that pin A of 3 confirm that pin B of 4 3 3 L 2 in a direction of r Q c O ai o r 0 a eo LL O gt O 5 S 5 C o 5 LL Installation of 4 and 6 Install 6 in 4 while pulling View for A install 6 in 3 while pushing L 1 in a direction of View for B arrow After installing 6 in 3 enters hole A of 6 properly arrow After installing 6 in 4 Fig DM3H View for A Fig DM4H SSA N A NMEN NAS S le Locking ta
17. of Cylinder Tape Correct Incorrect Guide Roller _ take up Guide Post 4 Tape 3 Check to see that the tape runs without creasing at Take up Guide Post 4 or without snaking between Guide Roller 3 and ACE Head Fig M3 and M5 2 3 3 4 creasing or snaking is apparent adjust the Tilt Adj Screw of the ACE Head Fig M6 Azimuth Adj Screw ACE Head Flat Screwdriver Tilt Adj Screw 1 B X Value Alignment Purpose To obtain maximum PB FM envelope signal at the pre set position of the Tracking Control Circuit align the Horizontal Position of the ACE Head Symptom of Misalignment If the Horizontal Position of the ACE Head is not prop erly aligned maximum PB FM envelope cannot be obtained at the preset position of the Tracking Control Circuit 1 Connect the oscilloscope to TP301 C PB and TP503 CTL on the Main CBA Use TP504 RF SW as a trigger 2 Playback the Gray Scale of the Alignment Tape FL6NS8 and confirm that the PB FM signal is present 3 Set the Tracking Control Circuit to the preset posi tion by pressing CH UP button and then PLAY button on the unit Refer to note on bottom of page 2 3 4 4 Use the Flat Screwdriver so that the PB FM signal at TP301 C PB is maximum Fig M6 D5P4HSMA 5 To shift the CTL waveform press CH UP or CH DOWN button on the remote control unit Then make sure that the maxim
18. ollers Use a blank tape 1 A Adjust the X Value for maximum envelope Page 2 3 3 Use Alignment Tape 1 B Adjust the envelope Page 2 3 4 1 C Check the envelope 1 C OK Adjust the Audio Section Azimuth Alignment Page 2 3 5 Check the audio output 1 D 1 X Value Page 2 3 3 No good Do the final tape traveling test to see that the tape runs normally in play mode with out creasing or slacking 1 A Check to see that the tape is not creasing and that there is no slack on the REV Post Use a blank tape 1 E Completion OK Check the following Adjust the X value and envelope 7 6 1 2 Envelope Page 2 3 4 2 3 2 D5P4HSMA 1 A Preliminary Final Checking and Alignment of Tape Path Purpose To make sure that the tape path is well stabilized Symptom of Misalignment If the tape path is unstable the tape will be damaged Note Do not use an Alignment Tape for this proce dure If the unit is not correctly aligned the tape may be damaged 1 Playback a blank cassette tape and check to see that the tape runs without creasing at Guide Rollers 2 and 3 and at points A and B on the lead sur face Refer to Fig M3 and MA 2 creasing is apparent align the height of the guide rollers by turning the top of Guide Rollers 2 and 3 with a Guide Roller Adj Screwdriver Refer to Fig M3 and M5 Guide Roller 2 Guide Roller 3 ACE Head Lead Surface
19. opardized by the service method selected STANDARDMAINTENANCE Service Schedule of Components This maintenance chart shows you the standard of replacement and cleaning time for each part Because those may replace depending on environment and purpose for use use the chart for reference h Hours Cleaning Replace Periodic Service Schedule NENNEN moon zon aoon aoon om omen ____ om emen ___ __ om meme me ow _ ow eme o moe me memewm __ wm pemewm mm meme __ __ M Brake SP Assembly B46 M Brake TU Assembly HI mm Notes 1 Clean all parts for the tape transport Upper Drum with Video Head Pinch Roller ACE Head FE Head using 90 ethyl alcohol 2 After cleaning the parts do all DECK ADJUSTMENTS 3 For the reference numbers listed above refer to Deck Exploded Views B73 Recording model only B86 Not used in 2 head model 2 1 1 U29PHSMEN Cleaning Cleaning of Video Head Clean the head with a head cleaning stick or chamois cloth Procedure 1 Remove the top cabinet 2 Put on a glove thin type to avoid touching the upper and lower drum with your bare hand 3 Put a few drops of 90 ethyl alcohol on the head cleaning stick or on the chamois cloth and
20. um output position of PB FM envelope signal becomes within 2ms from preset position Good FM envelope signal FM envelope output signal is adjusted at maximum No Good ______ FM envelope output signal is low Fig M7 6 Set the Tracking Control Circuit to the preset posi tion by pressing CH UP button and then PLAY button on the unit 1 C Checking Adjustment of Envelope Waveform Purpose To achieve a satisfactory picture adjust the Guide Rollers so that the PB FM envelope becomes as flat as possible Symptom of Misalignment If the envelope output is poor noise will appear in the picture The tracking will then lose precision and the playback picture will be distorted by any slight varia tion of the Tracking Control Circuit 1 Connect the oscilloscope to TP301 C PB on the Main CBA Use TP504 RF SW as a trigger 2 Playback the Gray Scale on the Alignment Tape FL6NS8 Set the Tracking Control Circuit to the preset position by pressing CH UP button and then PLAY button on the unit Adjust the height of Guide Rollers 2 and 3 Fig M3 Page 2 3 3 watching the oscilloscope display so that the enve lope becomes as flat as possible To do this adjust ment turn the top of the Guide Roller with the Guide Roller Adj Screwdriver 3 If the envelope is as shown in Fig M7 adjust the height of Guide Roller 2 Refer to Fig M3 so that the waveform looks like the one shown in F
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