Aiwa HV-BA75 Service Manual

SERVICE MANUALDATABASIC VIDEO MECHANISM : D33K-4HF/PAL(6721R-0250A)<7700/75> : D33K-4HD/NP-VCR(6721R-0205A)<935>STEREO VIDEO

10WIRE HARNESS DIAGRAM123455.2VAOTPB LED "H"KEY RTN 1GNDPOWER KEY123451234567D.CTLM.GNDDFG12VPGGND5.1V123456712345678GNDMOTOR GNDI-LIMITCAP

11BLOCK DIAGRAM-1 (POWER SECTION)TO SYS-16VG, -21VG, -27VG5.4VATO SYS/HIFIHOT CIRCUITBD101R101R141,142,143D141C103C113C112HOT GNDF101WH(BL)BK(BR)PW1

12BLOCK DIAGRAM-2 (AUDIO SIGNAL SECTION) <HV-GX935>PB VIDEO SIGNALREC VIDEO SIGNALPB AUDIO SIGNALREC AUDIO SIGNALJK901VIDEO OUT 2AUDIO OUT 2MONO

1413BLOCK DIAGRAM-3 (AUDIO SIGNAL-Hi-Fi AUDIO SECTION) <HV-FX7700/BA75>PB VIDEO SIGNALREC VIDEO SIGNALPB AUDIO SIGNALREC AUDIO SIGNALOUT(R)OUT(L

1615BLOCK DIAGRAM-4 (VIDEO SECTION)ACCC. COMB LPFYDELAYMAINCONVC LPFPB EQLPFYNRNLDE EMPY/CMIX6dB AMPCLAMPSERIALDECODERIIC BUSINTERFACEDATAACQUISITIONS

17BLOCK DIAGRAM-5 (NORMAL AUDIO SECTION)AUDIOREC/PBHEADAUDIOREC/PBHEADFL301,Q311IC301LA71598MAUDIO/VIDEOPROCESSIC301LA71598MAUDIO/VIDEOPROCESS78AUDIO

18BLOCK DIAGRAM-6 (TUNER, NICAM/A2 SECTION)14427605994143141X751<935><7700,BA75>5.4VA5.2VTENTREEANTENNEAERIALSORTIEANTENNERF.OUTToSYSTEM C

2019BLOCK DIAGRAM-7 (SYSTEM CONTROL/SERVO SECTION) <HV-FX7700/BA75>ToHi-Fi AUDIO/SCARTSECTIONToLOADINGMOTORToLOWER DRUMPDM01ToCAPSTANMOTORPCM01T

2221BLOCK DIAGRAM-8 (SYSTEM CONTROL/SERVO SECTION) <HV-GX935>ToSCARTSECTIONToPOWER/TUNERSECTIONToPOWER/TUNERSECTIONToAUDIO/VIDEOSECTIONToLOADING

2423SCHEMATIC DIAGRAM-1 (POWER/TUNER/NICAM SECTION) <HV-FX7700/BA75>NOTES) Symbol denotes AC ground.NOTES) Symbol denotes DC chassis g

2TABLE OF CONTENTSSPECIFICATIONS ... 3ACCESSORIES LIST ...

NOTES) Symbol denotes AC ground.NOTES) Symbol denotes DC chassis ground.NOTE) WarningNOTE) Parts that are shaded are criti

27VOLTAGE CHART-2 (AUDIO/VIDEO SECTION)PIN PB REC PIN PB REC PIN PB REC PIN PB REC PIN PB REC1 2.44 2.42 21 2.41 2.52 41 2.93 2.92 61 3.43 3.43 81 0 0

28WAVEFORMS-1 (AUDIO/VIDEO SECTION)IC301 Pin 20500mVp-pPB modeIC301 Pin 38, 32, 311Vp-pVideo inIC301 Pin 284.2Vp-pPB/REC modesIC301Pin 71.4Vp-pREC

3029SCHEMATIC DIAGRAM-3 (AUDIO/VIDEO SECTION)541591103 622216712121281311 1114MAIN(AUDIO/VIDEO SECTION)C.BToFULL ERASEHEADToSYSTEM CONTROL/SERVO/OSDSE

3231SCHEMATIC DIAGRAM-4 (Hi-Fi AUDIO/SCART SECTION) <HV-FX7700/BA75>PB VIDEO SIGNALREC VIDEO SIGNALPB AUDIO SIGNALREC AUDIO SIGNALHi-Fi AUDIOPRO

3433VOLTAGE CHART-3 SCHEMATIC DIAGRAM-5 (SCART SECTION) <HV-GX935> (Hi-Fi AUDIO/SCART SECTION)PB VIDEO SIGNALREC VIDEO SIGNALPB AUDIO SIGNALRE

3635SCHEMATIC DIAGRAM-6 (SYSTEM CONTROL/SERVO SECTION) <HV-FX7700/BA75>634 78 951210To LOADINGMOTOR ToAUDIO/VIDEOSECTIONToLOWER DRUMPDM01ToCAPS

37VOLTAGE CHART-4 (SYSTEM CONTROL/SERVO SECTION)IC501IC502 IC504SYSTEM IC IC5F1PIN PB REC PIN PB REC PIN PB REC PIN PB REC PIN PB REC1 0 0 21 2.

38WAVEFORMS-2 (SYSTEM CONTROL/SERVO SECTION)V.H/SW(IC501 Pin 105 )1V/10mSREC/PB modesDV-SYNC(IC501 Pin 109 )1V/100µSQUE/REV modesCTL+(IC501 Pin 3 )1

4039SCHEMATIC DIAGRAM-7 (SYSTEM CONTROL/SERVO SECTION) <HV-GX935>634 78 951210To LOADINGMOTOR ToAUDIO/VIDEOSECTIONToLOWER DRUMPDM01ToCAPSTANMOT

3REF. NO PART NO. KANRI DESCRIPTIONNO.ACCESSORIES LISTSPECIFICATIONS• Design and specifications are subject to change without notice.<HV-FX7700, BA

4241FL DISPLAY-2 <HV-GX935>• GRID ASSIGNMENT• ANODE CONNECTIONFL DISPLAY-1 <HV-FX7700/BA75>• GRID ASSIGNMENT• ANODE CONNECTION

1234567891011 12 1314ABCDEFGHIJ4443WIRING-1 (MAIN C.B) <HV-FX7700/BA75>D5C4ToFULLERASEHEAD252321191815131197531(1/2)(2/2)JK901(1/2)EURO AV1AUDIO

1234567891011 12 1314ABCDEFGHIJ4645WIRING-2 (MAIN C.B) <HV-GX935>D5C4D5A2D5A8ToFULLERASEHEADJK901EURO AV1AUDIO/VIDEOENTREEANTENNEAERIALSORTIEANT

1234567ABCDEFGHIJ4847SCHEMATIC DIAGRAM-8 (KEY1 SECTION) <HV-FX7700/BA75>SCHEMATIC DIAGRAM-9 (KEY2 SECTION) <HV-FX7700/BA75>WIRING-3 (KEY1

1234567ABCDEFGHIJ5049SCHEMATIC DIAGRAM-10 (KEY1 SECTION) <HV-GX935>SCHEMATIC DIAGRAM-11 (KEY2 SECTION) <HV-GX935>WIRING-5 (KEY1 C.B) <H

511234567ABCDEFGHIJWIRING-7 (NICAM C.B)ECBECBNICAM C.BToMAIN C.BPM701ToMAIN C.BPM702

52ADJUSTMENTTest Equipment• Oscilloscope • Test Tape• AC Millivolt Meter TTV-P1P3D02IC301PMC01MS501IC5F1IC501PMK02T101H/SWP3D01TU701W502W503M

531. Servo Adjustment1) PG AdjustmentMODE MEASUREMENT POINT ADJUSTMENT POINT SPECIFICATIONPLAY VIDEO OUT 'PLAY' KEY (SET)6.5H ± 0.5H(TTV-P1)

Pin No. Pin Name I/O Description54IC DESCRIPTION–OI/OI/OIIOII–I/OI/OI/OI/OIII–OIOI–IIIIII–IIII––IOIOOI/O1234567891011121314151617181920212223242526272

Pin No. Pin Name I/O Description554344454647484950515253545556575859606162636465666768697071727374757677787980818283R/C INS CanalN.CVCR 'H'R

4DISASSEMBLY INSTRUCTIONS1. Top Case Removal1) Remove 4 screws holding the top case.2. Panel Front Removal (see Fig. 1)1) Release 7 tabs, and then rem

Pin No. Pin Name I/O Description5684858687888990919293949596979899100101102103104105106107108109110111112CAP ACCELI-LIMITS. MONITOR2S. MONITOR1CST SWR

Pin No. Pin Name I/O Description57IC, µPD16311GC-AB6IOI–IIIII–OO––O–OOO––1 ~ 456789101112131415 ~ 2627 ~ 3233343536 ~ 444546 ~ 4849505152SHTL1 ~SHTL4D

58MECHANICAL EXPLODED VIEW 1/1260452330323A43A43P.C.BP.C.BP.C.BTU701300452320452250462462283284280283284280A00457457457457457457275DIG501(FX7700/BA75

59REF. NO PART NO. KANRI DESCRIPTIONNO.MECHANICAL MAIN PARTS LIST 1/1COLOR NAME TABLEBasic color symbol Color Basic color symbol Color Basic color sym

60MECHANISM EXPLODED VIEW 1/3101426103117104105100110115116112113114032109108426A22A23A21107106

61REF. NO PART NO. KANRI DESCRIPTIONNO.MECHANISM MAIN PARTS LIST 1/3TYPE MODEL NAME SUFFIX<77> HV-FX7700 Z<75> HV-BA75 Z<93> HV-GX93

62MECHANISM EXPLODED VIEW 2/3401002001023024032406406406028504014012504017013022015401401007006A03009025026027A040110310180190210200290044090165050030

63REF. NO PART NO. KANRI DESCRIPTIONNO.MECHANISM MAIN PARTS LIST 2/3TYPE MODEL NAME SUFFIX<77> HV-FX7700 Z<75> HV-BA75 Z<93> HV-GX93

64056057054053426077410032078A12067066065A11068069070079426064518052055518517061062060063519051059058MECHANISM EXPLODED VIEW 3/3

65REF. NO PART NO. KANRI DESCRIPTIONNO.MECHANISM MAIN PARTS LIST 3/3TYPE MODEL NAME SUFFIX<77> HV-FX7700 Z<75> HV-BA75 Z<93> HV-GX93

5SERVICE POSITIONTo set the mechanism to the service position in active status:Insert a spacer as shown below: The service position can be set in the

66DECK MECHANISM PARTS LOCATIONSBracket Side ’L’ 5Plate Assembly 2TopLever Assembly 8S/W4 Guide CST3 Holder Assembly CSTOpener Door6 BracketAsse

Cap FPCHolder FPC(only for 4HD-Hi-Fi Models)Drum Sub AssemblyRotorH1(S1)(S1)(S1)(S2)(S3)(S3)(S2)Drum MotorStatoror orOptional PartsDrum FPCHolder FPC(

68DECK MECHANISM DISASSEMBLYH1(A)(B)H2Plate Assembly TopArm Assembly F/LLever Assembly S/WBracket Side (L)(H5)H3GrooveGuide CSTGear Rack F/L Groove(Fo

69DECK MECHANISM DISASSEMBLY2. Plate Assembly Top (Fig. A-2-1)1) Unhook the (H1) and separate the Left Side.2) Unhook the (H2) and lift up the Plate A

70(1) Place the Spring Lever S/W of the above (No.1) as original position.8. Arm Assembly Cleaner(Fig. A-3-1)1) Break away the (A) part shown above Fi

71DECK MECHANISM DISASSEMBLY(For Jog Shuttle Models)Spring S BrakeBrake Assembly SArm AssemblyTension(C)(A)BandAssemblyTensionSpring TensionReel SReel

72DECK MECHANISM DISASSEMBLY(D)(C)Opener LidArm Assembly T/upBase Assembly P4Support CSTArmAssemblyPinch(B)(A)Fig. A-515. Support CST (Fig. A-5-1)1) B

73DECK MECHANISM DISASSEMBLYBelt CapstanMotor CapstanWasher(W1)Washer(W2 )Optional PartsGear H-Up/D-K(For Hi-Rewind Models) (For Normal Models)or Gear

74DECK MECHANISM DISASSEMBLYBrakeAssembly CapstanHole (A)+(B)(H2)(S4)Gear CamGuide Rack F/L(S4)Gear Rack F/LGear CamHole (B)(H1)Hole (A)BarkeAssembly

75DECK MECHANISM DISASSEMBLYWasher (W1)Gear DriveGear CamGear ConnectorHole (A)Hole (B')Hole (B')+(B)ChassisHole (A')+(A)Gear CamGear C

6VCR TEST TAPE INTERCHANGEABILITY TABLEThere are two types of the new allgnment tape CH-1B (for NTSC) and CH-2 (for PAL). On each tape four signals (

76DECK MECHANISM DISASSEMBLY(For Jog Shuttle Models)WasherGear SectorPlate SliderLever Tension(A)Base Tension(W1)(S4)Fig. A-929. Gear Sector (Fig. A-9

77DECK MECHANISM DISASSEMBLYGear Assembly P3Gear Assembly P2Base Assembly P2Base Assembly P3Arm Assembly Idler(For Normal Models) (For Jog Shuttle Mod

DECK MECHANISM ADJUSTMENT78• Tools and Fixtures for Service1. Cassette Torque meter1. SRK-VHT-303(Not SVC part)4. Torque gauge adaptor5. Post height a

79Purpose:To determine if the Mechanism is in the correct position, when a Tape is ejected.DECK MECHANISM ADJUSTMENT1.Mechanism Alignment Position Che

80Purpose: To insure smooth Transport of the Tape during each Mode of Operation.If the Tape Transport is abnormal, then check the Torque as indicated

DECK MECHANISM ADJUSTMENT814.Guide Roller Height AdjustmentAdjustment Procedure1) Confirm if the Tape runs along the Tape Guide Line of theLower Drum.

82DECK MECHANISM ADJUSTMENT5. Audio/Control (A/C) Head Adjustment10.9-0.05Purpose: To insure that the Tape passes accurately over the Audio and Contro

Purpose: To obtain compatibility with other VCR(VCP) Models.DECK MECHANISM ADJUSTMENT835-2. Confirm that the Tape passes smoothlybetween the Take-up G

Purpose: To correct for shift in the Roller Guide and X value after replacing the Drum.8-2.Check for tape curling or jammingTest Equipment/ Fixture• T

85MAINTENANCE/INSPECTION PROCEDURE(4) F/E Head(3) P1 Post(6) Drum Assembly(Video Head)(5) BaseAssembly P2(2) Tension Post(1) Supply Reel(7) Base Assem

7REF. NO PART NO. KANRI DESCRIPTIONNO.REF. NO PART NO. KANRI DESCRIPTIONNO.ELECTRICAL MAIN PARTS LISTIC! S2-309-024-040 SENSORLTV-817B PHOTO COU

86MAINTENANCE/INSPECTION PROCEDUREThe recording density of a VCR(VCP) is much higher thanthat of an audio tape recorder. VCR(VCP) components mustbe ve

MAINTENANCE/INSPECTION PROCEDURE87(1) Greasing guidelinesApply grease, with a cleaning patch. Do not use excess grease. It may come into contact with

MECHANISM TROUBLESHOOTING GUIDE88Auto REW doesn't work.Is the output of END sensor of supply side "H"?“H”: more than 3.5V“L”: less than

MECHANISM TROUBLESHOOTING GUIDE89AUTO STOP.(PLAY/CUE/REV)Are there T/up and supply reelpulses. In Play/Cue/Rev is the pinchroller in contact with the

MECHANISM TROUBLESHOOTING GUIDE90In PB mode Tape Presencenot sensed.Is the Pinch Roller attached to the Capstan Motor Shaft?Check Alignment positions(

MECHANISM TROUBLESHOOTING GUIDE91Cassette cannot be inserted.Does the Lever Switch work?Is the Lever Switch Spring damaged or omitted?Does the F/L swi

MECHANISM TROUBLESHOOTING GUIDE92Cassette will not load.Does the CST insert?Does the opener Lid work?Is the opener Door assembled correctly?Replace th

2–11, IKENOHATA 1–CHOME, TAITO-KU, TOKYO 110-8710, JAPAN TEL:03 (3827) 3111H251701Printed in Singapore

8REF. NO PART NO. KANRI DESCRIPTIONNO.REF. NO PART NO. KANRI DESCRIPTIONNO. C828 87-015-684-080 CAP,E 47-16V<75,77> C832 87-015-684-0

9 C766 87-010-403-040 CAP,E 3.3-50V<75,77> C769 87-015-681-080 CAP,E 10-16V<75,77> C770 87-015-684-080 CAP,E 47-16V&l