Sharp VC-A410U Manuale di Servizio

1VC-A410UVC-H810US20W6VC-A410USERVICE MANUALThis document has been published to be used forafter sales service only.The contents are subject to change

10VC-A410UVC-H810U3. FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW)No. FunctionNo. Function1 Full erase head2 Supply pole base ass’y3 Tension arm4 Idle

11VC-A410UVC-H810UFUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW)No. FunctionNo. Function15 Drum ass’y16 Loading motor17 Drum drive motor18 Take-up p

12VC-A410UVC-H810U4. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITSThe explanation given below relates to the on-site general service (field

13VC-A410UVC-H810U4-2 MAINTENANCE CHECK ITEMS AND EXECUTION TIMEPerform the maintenance with the regular intervals as follows so as to maintain the qu

14VC-A410UVC-H810UFigure 4-1.• Reassembly1. Before installing the cassette housing control, short-circuit between TP803 and TP802 provided at operatio

15VC-A410UVC-H810U4-5 REEL DISK REPLACEMENT AND HEIGHTCHECK• Removal1. Remove the cassette housing control assembly.2. Pull the tension band out of th

16VC-A410UVC-H810UNote:Whenever replacing the reel disk, perform the height check-ing and adjustment.Notes:1. Hold the torque gauge by hand so that it

17VC-A410UVC-H810UNotes:1. Hold the torque gauge by hand so that it is not moved.2. Do not keep the reel disk in lock state. Do not allow long-time me

18VC-A410UVC-H810UFigure 4-13.1. Detach the pinch roller from the capstan shaft.Do not separate excessively. Or the pinch lever andpinch double action

19VC-A410UVC-H810U2. Visually check to see if the right edge of the tension poleis within the 2.3 ± 0.25 from the right edge of the Supguide shaft.Ins

2VC-A410UVC-H810UIMPORTANT SERVICE NOTESWARNING : TO REDUCE THE RISK OF FIRE OR ELEC-TRIC SHOCK, DO NOT EXPOSE THIS AP-PLIANCE TO RAIN OR MOISTURE.RIS

20VC-A410UVC-H810U• Adjustment1. If the indication of torque cassette meter is lower thanthe setting, shift the tension spring engagement to thepart A

21VC-A410UVC-H810UFigure 4-24.• Replacement1. Solder the removed PWB to the new head assembly.2. Adjust the height from the A/C head arm (lower surfac

22VC-A410UVC-H810U500gFigure 4-26.Figure 4-27.Height screwAzimuth screwTilt screwCassette tapeWeight to preventfloat (500g)Mechanism chassisTape0.3mm

23VC-A410UVC-H810U4-18 ADJUSTMENT OF TAPE DRIVE TRAIN1. Tape run rough adjustment1 Remove the cassette housing control assembly.2 After shortcircuitin

24VC-A410UVC-H810U3 Next, press the tracking button (+), (–) and changethe envelope waveform from max to min and frommin to max. At this time adjust t

25VC-A410UVC-H810U4-20 REPLACEMENT OF DRUM D.D. MOTOR1. Set the ejection mode.2. Withdraw the main power plug from the socket.• Removal (Perform in nu

26VC-A410UVC-H810U4-22 ASSEMBLING OF PHASE MATCHINGMECHANISM COMPONENTS• Assemble the phase matching mechanism compo-nents in the following order.1. A

27VC-A410UVC-H810U1Insert Reverse Guide Lever Ass’yFigure 4-41-1.Figure 4-41-3.Figure 4-41-2.Phase Matching Point 2Pinch Roller DoubleAction Lever Ass

28VC-A410UVC-H810UFigure 4-43.4-23 INSTALLING THE SHIFTERFigure 4-42.1. Make sure that the loading gear is at the Phase-Match-ing point 1 as shown bel

29VC-A410UVC-H810U4-24 INSTALLING THE MASTER CAM (ATREAR SIDE OF MECHANISM CHASSIS)1. Make sure beforehand that the shifter is at the point asshown be

3VC-A410UVC-H810UNOTES DE SERVICE IMPORTANTESATTENTION: POUR REDUIRE LES RESQUES D'IN-CENDIE OU DE CHOC ELECTRIQUE,NE PAS EXPOSER CET APPAREIL AL

30VC-A410UVC-H810U2. Synchro Gear, Drive Gear L and Drive Gear R4-26 ASSEMBLY OF CASSETTE HOUSING1. Drive Gear and R Drive angle ass’yFigure 4-47.MSPR

31VC-A410UVC-H810U5. ELECTRICAL ADJUSTMENTNotes:• Before the adjustment:Electrical adjustments discussed here are often required after replacement of

32VC-A410UVC-H810USERVO CIRCUIT ADJUSTMENT5-1 ADJUSTMENT OF HEAD SWITCHINGPOINTMeasuring Color TV monitorinstrumentMode Playback stillCassette Self-re

33VC-A410UVC-H810U1011 1101111101000101000100000100010100010S sensorOpenCloseMode detection insidesensor A111000000Mode detection outsidesensor B01111

34VC-A410UVC-H810USTOP REC/PLAYPLAY STILLPLAY VSRVSR PLAYCapstan motor turnscounterclockwise.Is take-up reel sensor signaloutputted

35VC-A410UVC-H810USTOP FF/REWSTOP CASSETTE EJECTFF/REW STOPNONOFF/REWoperationBrakefunctionTurn capstan motor innormal or reverse direc

36VC-A410UVC-H810UMECHANISM TROUBLESHOOTING1. FF/REW FAILURE (NO TAPE WINDING)Press FF key.NONONONO NO NONONOYESYESYESYESYESYESYES YESIs master cam at

37VC-A410UVC-H810UReplace loading motor block.3. WINDING FAILURE AT VSR 4. UNUSUAL SOUND IN EACH MODEIs Playbackfunction normal ?Master camshifting to

38VC-A410UVC-H810UYESYESNONONONOYESYESReplace capstan motor.4-ii) Unusual sound in FF/REW modeIs reel disk height as specified ?Thrust gap found at re

39VC-A410UVC-H810U7. TROUBLESHOOTINGFLOW CHART NO.1No powerThe fuse blows out even when it is replaced with new one.See FLOW CHART NO.2 <Fuse blown

4VC-A410UVC-H810UPRECAUTIONS IN PART REPLACEMENTWhen servicing the unit with power on, be careful to the section marked white all over.This is the pri

40VC-A410UVC-H810UFLOW CHART NO.6No operation is possible from the infrared remote control.Operation is possible from the VCR, but no operation is pos

41VC-A410UVC-H810UFLOW CHART NO.9The cassette tape fails to eject.Does the capstan motor start whenthe EJECT button is pressed?See FLOW CHART NO.12. D

42VC-A410UVC-H810UFLOW CHART NO.12The drum motor fails to run.Is the voltage more than about 2.6V DC given out of pin(46) of IC701.Check IC701.NONONOY

43VC-A410UVC-H810UFLOW CHART NO.15Drum servo does not function.Check peripheral circuit of X701.Is there 14.318MHz oscillation at pins(37) and (38) of

44VC-A410UVC-H810U1 2FLOW CHART NO.16Capstan servo does not function.Only PB mode inoperativeYESOnly REC mode inoperativeYESYESNOYESNO NONONONOCheck p

45VC-A410UVC-H810UPicture E-E does not appear.Is picture signal input into pins(30) and (31) of IC201?YESYESYESYESYESYESNONONONONONONONO1 External inp

46VC-A410UVC-H810UPicture (luminance) record is impossible (E-E mode is possible). Although picture record is possible, color does not appear (E-E mod

47VC-A410UVC-H810UPlayback picture does not appear (E-E mode is possible).YESYESYESYESYESYESYESYESNONOYESYESYESYESYESYESYESNONONONONONONONONONONONOIs

48VC-A410UVC-H810UYESYESYESYESNONONONONONOFLOW CHART NO.22Is there signal inputted at each terminal of IC651 as shown in table?Front input terminalRea

49VC-A410UVC-H810ULinear audio playback is impossible.(Hi-Fi E-E mode is normal).Are MH-AA harness and playback AMP. peripheral parts normal?Is the AC

5VC-A410UVC-H810U1. GENERAL INFORMATION1-1 FEATURESOnly for VC-H810U• Hi-Fi Stereo Sound• Built-in MTS (Multi-channel TV Sound) DecoderCommon Feature

VC-A410UVC-H810UVC-A410UVC-H810U50~518. BLOCK DIAGRAMSYSTEM SERVO BLOCK DIAGRAM

VC-A410UVC-H810UVC-A410UVC-H810U52~53SIGNAL FLOW BLOCK DIAGRAM(VC-A410U)E-E signalE-E signal(Audio)Audio playback signalAudio recording signalPlayback

VC-A410UVC-H810UVC-A410UVC-H810U54~55SIGNAL FLOW BLOCK DIAGRAM(VC-H810U)E-E signalE-E signal(Audio)Audio playback signalAudio recording signalPlayback

56VC-A410UVC-H810UPOWER CIRCUIT BLOCK DIAGRAM

57VC-A410UVC-H810UIMPORTANT SAFETY NOTICE:PARTS MARKED WITH " å" ( ) AREIMPORTANT FOR MAINTAINING THE SAFETYOF THE SET.BE SUR

VC-A410UVC-H810UVC-A410UVC-H810U58~591234567891011 12 13 14 15 16 17 18 19 20ABCDEFGHIJ* VOLTAGE MEASUREMENT MODEPB ... Parentheses ( )REC

VC-A410UVC-H810UVC-A410UVC-H810U60~611234567891011 12 13 14 15 16 17 18 19 20ABCDEFGHIJ* VOLTAGE MEASUREMENT MODEPB ... Parentheses ( )REC

VC-A410UVC-H810UVC-A410UVC-H810U62~631234567891011 12 13 14 15 16 17 18 19 20ABCDEFGHIJ* VOLTAGE MEASUREMENT MODEPB ... Parentheses ( )REC

VC-A410UVC-H810UVC-A410UVC-H810U64~651234567891011 12 13 14 15 16 17 18 19 20ABCDEFGHIJ* VOLTAGE MEASUREMENT MODEPB ... Parentheses ( )REC

66VC-A410UVC-H810U* VOLTAGE MEASUREMENT MODEPB ... Parentheses ( )REC ... Without ParenthesesOPERATION CIRCUITABCDEFGHIJ12345678910

6VC-A410UVC-H810U1-3 LOCATION OF MAJOR COMPONENTS AND CONTROLLED Indicator (explained throughout the operation Instruction)11POWER2TIMER3VCR4REC5TAMP

67VC-A410UVC-H810UABCDEFGHIJ12345678910PWB FOIL PATTERNOPERATION PWBComponent SideWiring Side

VC-A410UVC-H810UVC-A410UVC-H810U68~691234567891011 12 13 14 15 16 17 18 19 20ABCDEFGHIJMAIN PWBComponent Side

VC-A410UVC-H810UVC-A410UVC-H810U70~711234567891011 12 13 14 15 16 17 18 19 20ABCDEFGHIJMAIN PWBWiring Side

72VC-A410UVC-H810U- M E M O -

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code73VC-A410UVC-H810UMany electrical and mechanical parts in video cassette reco

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code74VC-A410UVC-H810UPACKAGED CIRCUITSå R901 RR-DZ0047CEZZ V 2.7M Resistor ADX50

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code75VC-A410UVC-H810UC512 VCKYCY1HF103Z V 0.01 50V Ceramic AAC513 VCKYCY1HF103Z

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code76VC-A410UVC-H810Uå C903 RC-KZ0147GEZZ J 3300p AC125V Ceramic AC orå

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code77VC-A410UVC-H810UR674 VRS-CY1JF473J V 47k 1/16W Metal Oxide AA(VC-H810U)R675

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code78VC-A410UVC-H810UR774 VRS-CY1JF102J V 1k 1/16W Metal Oxide AA(VC-H810U)R776

7VC-A410UVC-H810UBCAB59610117833C1A1224VC-H810UVC-A410U112. DISASSEMBLY AND REASSEMBLY2-1 DISASSEMBLY OF MAJOR BLOCKSTOP CABINET : Remove 2 screws 1.

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code79VC-A410UVC-H810UR885 VRS-CY1JF223J V 22k 1/16W Metal Oxide AAR886 VRS-CY1JF

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code80VC-A410UVC-H810U304 LHLDX1031AJZZ V Holder (R) AE305 LHLDX1032AJ00 V Frame

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code81VC-A410UVC-H810UABCDEFGH12345611. EXPLODED VIEW OF MECHANICAL PARTSMECHANIS

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code82VC-A410UVC-H810UCASSETTE HOUSING CONTROL PARTSABCDEFGH123456301303311311304

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code83VC-A410UVC-H810UCABINET PARTSABCDEFGH123456ABCCB600609615602612605604603607

Ref. No. Part No. ★ Description Code Ref. No. Part No. ★ Description Code84VC-A410UVC-H810UPRECAUTION ON FRONT PANEL SET-UPCassette coverCassette cove

8VC-A410UVC-H810UMECHANISM CHASSIS2-2 DISASSEMBLING THE MECHANISM/MAIN PWB ASSEMBLY1. When removing the mechanism from the main PWB,remove the antenn

9VC-A410UVC-H810USTART SENSOR2-3 CARES WHEN REASSEMBLINGINSTALLING THE CASSETTE HOUSINGWhen the cassette housing is installed on the mechanism,the in