Aiwa HV-BA75, Service Manual

Page 1: ...VCR 6721R 0205A 935 STEREO VIDEO CASSETTE RECORDER 7700 75 VIDEO CASSETTE RECORDER 935 HV FX7700 HV BA75 HV GX935 S M Code No 09 007 347 2R3 Z Z Z R E V I S I O N This Service Manual is the Revision...

Page 2: ...Assembly Tension 71 14 Reel S Reel T 71 15 Support CST 72 16 Base Assembly P4 72 17 Opener Lid 72 18 Arm Assembly T up 72 19 Arm Assembly Pinch 72 20 Belt Capstan Motor Capstan 73 21 Clutch Assembly D...

Page 3: ...save mode Dimensions 360 W x 270 D x 94 5 H mm 141 4 x 103 4 x 33 4 in Weight Approx 3 5 kg 7 7 lbs HV GX935 Video recording system Rotary 2 head helical scanning system Video head 2 heads Tuner syst...

Page 4: ...rection of arrow 2 Fig 2 4 Mechanism Removal see Fig 3 1 Disconnect the drum FF cable from the connector PMD01 on the Main C B 2 Disconnect the ACE head FF cable from the connector P3D02 on the Main C...

Page 5: ...tatus Insert a spacer as shown below The service position can be set in the stable status without any defective contact Location Install spacers at locations A and B MAIN C B D33 MECHANISM SPARSER 60m...

Page 6: ...z CH 1B 2 NTSC Stairsteps 1 kHz SP No Changed NTSC Color bar 1 kHz EP CH 1B 4 2 No Changed CH 1B 1 NTSC Stairsteps 7 kHz SP CH 1B 4 NTSC Color bar 1 kHz EP No Changed CH 1B 3 NTSC Color bar No sound S...

Page 7: ...2 87 015 684 080 CAP E 47 16V C325 87 015 695 080 CAP E 1 0 50V C326 87 015 681 080 CAP E 10 16V C327 87 015 681 080 CAP E 10 16V C333 87 015 681 080 CAP E 10 16V C337 87 015 698 080 CAP E 4 7 50V C33...

Page 8: ...77 P3D02 S6 30R 5S0 08E CONN 6P P3D03 S5 612 51B 000 GB201 2P TS B LGC P P7M01 S5 618 48F 000 CABLE 2P 75 77 P7M02 S5 618 48F 000 CABLE 2P 75 77 PMC01 S6 30R BE0 1H0 CONN 8P PMD01 S5 612 34V 000 GF12...

Page 9: ...OIL 10UH 75 77 L754 87 003 129 080 INDUCTOR 6800 75 77 L755 87 003 129 080 INDUCTOR 6800 75 77 X751 S5 290 219 000 X TAL 18 432MHZ 75 77 TRANSISTOR ILLUSTRATION REF NO PART NO KANRI DESCRIPTION NO TYP...

Page 10: ...DRUM CAPSTAN MOTOR MS501 MODE SW FULL ERASE HEAD CYL HEADS MAIN C B KEY2 C B 935 ACE HEADS PMD01 PDM01 PMC01 PCM01 P3D02 MS501 P3D03 1 2 LD LD 1 2 LOADING MOTOR PML01 P3D01 PKM01 PMK01 1 2 3 4 5 5 2V...

Page 11: ...106 D109 C120 L104 C121 FLD Drive F102 D107 C118 ZD104 C155 D108 FR01 C119 NOTES Symbol denotes AC ground Symbol denotes DC chassis ground FROM COM 5 2VG TO System FROM COM P CTL H LINE FILTER BLOCK C...

Page 12: ...C VIDEO SIGNAL PB AUDIO SIGNAL REC AUDIO SIGNAL JK901 VIDEO OUT 2 AUDIO OUT 2 MONO A IN MOD A OUT To AUDIO VIDEO SECTION BUF V IN TU V IN TU A L To POWER TUNER SECTION AUDIO OUT 1 VIDEO OUT 1 1 3 5 7...

Page 13: ...A9605H Hi Fi AUDIO PROCESS TU A R TU A L HiFi REC HiFi PB B HiFi PB A IIC CLK IIC DATA A ENV LP REC MUTE H A H SW To CYL HEADS To POWER TUNER SECTION To SYSTEM CONTROL SERVO OSD SECTION BUF V IN TU V...

Page 14: ...ESSOR IC301 LA71598M AUDIO VIDEO PROCESSOR IC7V1 LC74793 VPS PDC DECODER Q301 Q302 Q303 Q304 Q304 6 7 16 FROM CYL HEADS To CYL HEADS To SYSTEM CONTROL SERVO OSD SECTION To SYSTEM CONTROL SERVO OSD SEC...

Page 15: ...AUDIO SCART SECTION To SCART SECTION To SCART SECTION 76 80 ALC LINE AMP MUTE 96 98 7 6 REC AMP AUTO BIAS CONTROL Q307 99 BIAS OSC 4 1 100 6 5 96 99 DATA CLK MONO A OUT SERIAL DECODER LINE AMP Q308 Q3...

Page 16: ...POWER SECTION To Hi Fi AUDIO SCART SECTION To POWER SECTION To Hi Fi AUDIO SCART SECTION To Hi Fi AUDIO SCART SECTION REC VIDEO SIGNAL PB VIDEO SIGNAL REC AUDIO SIGNAL PB AUDIO SIGNAL 144 875 19 Q701...

Page 17: ...NER SECTION To POWER TUNER SECTION To AUDIO VIDEO SECTION UPD16311GC 9MT168GK SYSCON SERVO OSD PROCESS MAIN SYSTEM CONTORL SERVO OSD SECTION C B 7700 75 TSOP1238SP1 DISPLAY DRIVER IC501 HD6432197XA04F...

Page 18: ...R To LOWER DRUM PDM01 To CAPSTAN MOTOR PCM01 UPD16311GC 7MT229GK MAIN SYSTEM CONTORL SERVO OSD SECTION C B 935 TSOP1238SP1 SYSCON SERVO OSD PROCESS IC501 HD6432197XA04F DISPLAY DRIVER A ENV A LEVEL R...

Page 19: ...RT SECTION To AUDIO VIDEO SECTION MAIN POWER TUNER SECTION C B 7700 75 NICAM C B 7700 75 LFS2020V4 04350 ERA18 02KFRB 6 4 8 9 10 2 11 12 13 14 15 1 7 ERC81 004L22 1 2 3 KRA103M KTA1273 KTA1273 KTC3199...

Page 20: ...RUM AC INPUT G D S 26 25 SCHEMATIC DIAGRAM 2 POWER TUNER SECTION HV GX935 IC102 1 4 PB REC 4 0 4 0 0 0 0 0 PB REC 4 9 4 9 3 9 4 0 PB REC PB REC PB REC IC103 2 5 2 5 0 0 0 0 3 9 3 9 Gate Anode Cathode...

Page 21: ...3 25 3 22 55 4 91 4 91 75 4 96 4 94 95 0 0 16 5 01 5 02 36 1 82 1 95 56 0 56 0 57 76 2 43 2 41 96 2 29 2 38 17 3 08 0 15 37 4 79 4 79 57 3 44 3 44 77 0 01 0 14 97 0 0 18 1 98 2 45 38 1 81 2 25 58 5 00...

Page 22: ...29 2 1Vp p PB mode IC301 Pin 23 5Vp p PB REC modes IC301 Pin 41 400mVp p PB mode IC301 Pin 67 600mVp p PB mode IC301 Pin 24 5Vp p PB REC modes 1 2 3 4 8 7 6 5 9 10 IC301 Pin 71 72 340mVp p REC mode IC...

Page 23: ...SECTION 7700 75 R3A1 47K 7700 75 JUMPER 935 R3B1 5 1K 7700 75 3 3K 935 7700 75 935 7700 75 7700 75 935 7700 75 935 To SCART SECTION R305 1 5K 7700 75 1 2K 935 R313 470 7700 75 390 935 L303 100u 7700 7...

Page 24: ...UNER SECTION To POWER TUNER SECTION To POWER TUNER SECTION To AUDIO VIDEO SECTION To AUDIO VIDEO SECTION To AUDIO VIDEO SECTION To SYSTEM CONTROL SERVO OSD SECTION To SYSTEM CONTROL SERVO OSD SECTION...

Page 25: ...3 11 9 12 0 3 9 3 9 3 9 3 9 3 9 3 9 0 8 0 8 3 9 3 9 3 9 3 9 0 0 0 0 0 8 0 8 3 9 3 9 3 9 3 9 3 9 3 9 PB REC 3 8 3 8 3 9 3 9 3 9 3 9 3 9 3 9 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 9 3 8 3 9 0 0...

Page 26: ...C B 7700 75 10PC GDZJ6 8C 470u 6 3V 47u 50V GP1S566 GP1S566 KRC103M KRC103M UPD16311GC AB6 HD6432197XA04F 6 5 4 3 2 1 64 65 82 77 141 FLD DATA MS FLD DATA SW MDO RES 5 4VA GND PMJ01 LOADING MOTOR DRIV...

Page 27: ...2 45 39 2 17 2 18 59 PULSE PULSE 79 0 0 99 H L H L 20 0 0 40 0 0 60 PULSE PULSE 80 2 56 2 56 100 0 SP 5 25 LP PIN PB REC 101 0 1 44 102 5 25 5 25 103 PULSE PULSE 104 PULSE PULSE 105 H L H L 106 H L H...

Page 28: ...9 1V 100 S QUE REV modes CTL IC501 Pin 3 1V 10mS CTL IC501 Pin 4 1V 10mS DFG IC501 Pin 104 1V 1mS REC PB mode DPG IC501 Pin 103 1V 10mS REC PB modes V OUT IC501 Pin 19 500mV 20 S EE PB modes CFG IC501...

Page 29: ...S566 GP1S566 KRC103M KRC103M UPD16311GC AB6 HD6432197XA04F 6 5 4 3 2 1 64 65 82 77 141 FLD DATA MS FLD DATA SW MDO RES 5 4VA GND PMJ01 LOADING MOTOR DRIVE EEPROM RESET DISPLAY 7MT229GK SYSCON SERVO OS...

Page 30: ...42 41 FL DISPLAY 2 HV GX935 GRID ASSIGNMENT ANODE CONNECTION FL DISPLAY 1 HV FX7700 BA75 GRID ASSIGNMENT ANODE CONNECTION...

Page 31: ...C E B C E B C E B C E E C B E C B B C E B C E B C E E C B R C5F1 REMOTE SENSOR MAIN C B AC INPUT 4 6 B C E 1 3 MODE SW 3 1 3 1 2 1 L705 C710 R7M2 C714 C7M2 C713 C7M6 R7M3 R7M1 C7M1 1 1 3 2 PMD01 To LO...

Page 32: ...C E B C E B C E B C E E C B E C B B C E B C E B C E E C B R C5F1 REMOTE SENSOR MAIN C B AC INPUT 4 6 B C E 1 3 MODE SW 3 1 3 1 2 1 L705 C710 R7M2 C714 C7M2 C713 C7M6 R7M3 R7M1 C7M1 1 1 3 2 PMD01 To L...

Page 33: ...7700 75 To MAIN C B SYSTEM CONTROL SERVO OSD SECTION PMK02 SW905 REC OTR SW906 PAUSE STILL SW910 STOP SW911 EJECT SW907 SW908 SW909 REW F FWD PLAY POWER STANDBY ON SW904 ONE TOUCH PLAYBACK ONE TOUCH P...

Page 34: ...C B 935 To MAIN C B SYSTEM CONTROL SERVO OSD SECTION PMK02 SW905 REC OTR SW907 REW SW909 F FWD SW908 PLAY SW910 STOP EJECT POWER STANDBY ON ONE TOUCH PLAYBACK SW903 LD901 SRC1201 SG5311 SW906 PAUSE ST...

Page 35: ...51 1 2 3 4 5 6 7 A B C D E F G H I J WIRING 7 NICAM C B E C B E C B NICAM C B To MAIN C B PM701 To MAIN C B PM702...

Page 36: ...52 ADJUSTMENT Test Equipment Oscilloscope Test Tape AC Millivolt Meter TTV P1 P3D02 IC301 PMC01 MS501 IC5F1 IC501 PMK02 T101 H SW P3D01 TU701 W502 W503 MAIN C B TOP VIEW Adjustment Location...

Page 37: ...ng or Tracking when the ATR is blink after the PAL SP Test Tape is inserted 2 Connect the CH1 of the oscilloscope to the H SW W502 W503 and CH2 to the Video Out for the VCR 3 Trigger the mixed Video S...

Page 38: ...t CFG input Servo Block power supply 5V For the connection of AFC C of sync separator Generates AFC of sync separator LPF of sync separator C SYNC input Capacitor connection GND Video signal input for...

Page 39: ...n forward reverse control output Top sensor input Capstan Vcc control output VCR Plus II control code output Remote control finder output control Remote control finder muting control Micom power suppl...

Page 40: ...I Capstan control output during slow Output to control capstan current Servo monitor 2 Servo monitor 1 CST SW REC Tab input AV link data input AV link data output BBE AIWA RGB PATH AKAI Supply reel in...

Page 41: ...et to VDD voltage Serial data is input at the leading edge and data is output at the trailing edge The leading or trailing edge initializes the serial I F to stand by for receiving a command The data...

Page 42: ...VIEW 1 1 260 452 330 323 A43 A43 P C B P C B P C B TU701 300 452 320 452 250 462 462 283 284 280 283 284 280 A00 457 457 457 457 457 457 275 DIG501 FX7700 BA75 Models GX935 Model 2SCART FX7700 BA75 Mo...

Page 43: ...0 S1 10R 012 8U0 CASE TOP 260 FRAME MAIN 275 S9 30R 013 3A0 HOLDER DIGITRON 93 275 S9 30R 013 3B0 HOLDER DIGITRON 75 77 280 PANEL FRONT BFA203P 93 280 PANEL FRONT 7700K 75 77 283 S5 80R 003 3N0 DOOR C...

Page 44: ...60 MECHANISM EXPLODED VIEW 1 3 101 426 103 117 104 105 100 110 115 116 112 113 114 032 109 108 426 A22 A23 A21 107 106...

Page 45: ...RACKET SIDE L 103 HOLDER SIDE L 104 S9 74R 001 9A0 GUIDE CST 105 HOLDER CST 106 HOLDER SIDE R 107 LEVER STOPPER R 108 BRACKET SIDE R 109 OPENER DOOR 110 ARM F L L 112 BODY F L 113 SPRING F L R 114 ARM...

Page 46: ...EXPLODED VIEW 2 3 401 002 001 023 024 032 406 406 406 028 504 014 012 504 017 013 022 015 401 401 007 006 A03 009 025 026 027 A04 011 031 018 019 021 020 029 004 409 016 505 003 003 FX7700 BA75 Models...

Page 47: ...00 7A0 BASE ASSY P4 015 S8 70R 000 3A0 OPENER LID 016 S0 41R 000 5F0 BASE ASS A C HEAD 017 S4 08R 000 1B0 REEL S 018 S9 70R 005 4A0 SPRING SB 019 S4 21R 000 3A0 BRAKE ASSY S 020 S9 70R 005 3A0 SPRING...

Page 48: ...64 056 057 054 053 426 077 410 032 078 A12 067 066 065 A11 068 069 070 079 426 064 518 052 055 518 517 061 062 060 063 519 051 059 058 MECHANISM EXPLODED VIEW 3 3...

Page 49: ...S9 70R 005 9A0 SPRING CAPSTAN 060 S5 10R 002 5B0 F R LEVER 061 S2 65R 000 3A0 CLUTCH ASSY D33K 062 S4 70R 005 8A0 GEAR UP D33K 063 S9 70R 005 1A0 SPRING UP D 064 S4 70R 003 4A0 GEAR SECTOR 065 LEVER...

Page 50: ...sHole A 2 4 GuideCST 2 Hooks A 2 2 3 4 5 BracketSide L 1 Screw A 2 2 3 4 6 BracketAssemblyDoor 1 Screw A 2 2 3 4 5 6 7 ArmAssemblyF L ChassisHole A 2 2 3 4 5 8 LeverAssemblyS W ChassisHole A 2 9 ArmAs...

Page 51: ...the back side of the Chassis and separate the Cap FPC 2 Remove three Screws S1 and lift up the Drum Assembly 3 Remove two Screws S2 and Separate the Stator of Drum Motor 4 Remove two Screws S3 and Se...

Page 52: ...sembly F L Lever Assembly S W Bracket Side L H5 H3 Groove Guide CST Gear Rack F L Groove For Jog Shuttle Models H4 Bracket Assembly Door S4 S4 Arm F L Holder Assembly CST Lever Stopper R Fig A 2 Fig A...

Page 53: ...bove No 1 and disassemble the Guide CST in the direction of the arrow 5 Bracket Side L Fig A 2 4 Bracket Assembly Door Fig A 2 5 1 Remove the Screw S4 and disassemble the Bracket Side L in the front 2...

Page 54: ...d lift up the Arm Assembly Cleaner 9 Head F E Fig A 3 2 1 Unhook the two Hooks H1 on the back side of the Chassis and lift up the Head F E 10 Base Assembly A C Head Fig A 3 3 1 Remove the Screw S5 and...

Page 55: ...direction and then lift up the Brake Assembly T 1 When reassembling be careful not to change the Spring with above No 11 Refer to Fig B 2 13 Arm Assembly Tension Fig A 4 3 1 Remove the Spring Tension...

Page 56: ...ssing of the Chassis in the counterclockwise direc tion and lift up the Base Assembly P4 17 Opener Lid Fig A 5 3 1 Break away the C Part of the Opener Lid from the Embossing of the Chassis in the Cloc...

Page 57: ...1 When reassembling Confirm the A B parts of Motor Capstan is located to the A B of the Chassis 21 Clutch Assembly D33 K Fig A 6 3 1 Remove the Washer W1 and lift up the Clutch Assembly D33 K 22 Lever...

Page 58: ...lift up the Bracket Assembly Jog 25 Guide Rack F L Fig A 7 2 Gear Rack F L Fig A 7 3 1 Remove the Screw S4 and lift up the Guide Rack F L 2 Lift up the Gear Rack F L 26 Brake Assembly Capstan Fig A 7...

Page 59: ...up the Gear Connector 1 When reassembling confirm that the Hole A of the Gear Connector is aligned to the Hole A of the Chassis Fig A 8 3 2 When reassembling confirm that the Hole B of the Gear Cam is...

Page 60: ...Plate Slider Fig A 9 3 Lever Tension Fig A 9 4 1 Remove the Screw S4 and lift up the Base Tension 2 Lift up the Plate Slider 3 Hold the A Part of the Lever Tension and turn to the counterclockwise di...

Page 61: ...4 1 Move the Base Assembly P3 in the direction of the arrow of the Chassis Hole A and push down the Base Assembly P3 2 Move the Base Assembly P2 in the direction of the arrow of the Chassis Hole B and...

Page 62: ...00 150 50 0 300 250 200 150 50 0 100 ALIGNMENT TAPES FOR ADJUSTMENT Derivation No Mechanism Adjustment ltems FM Envelope A PAL SP LP 2 4 Head TTV P2L B PAL SP 2 Head TTV P2 C NTSC SP LP EP 2 4 Head TT...

Page 63: ...Alignment is as below Fig C 2 4 Remove the Screw which fixes the Deck Mechanism and Main Frame and confirm if the Gear Cam is aligned with the Gear Drive as below Fig C 1 A 5 Confirm if the Mode S W o...

Page 64: ...aptor with the Torque Gauge affixed The Torque reading to measure occurs when the Tape abruptly changes direction from Fast Forward of Rewind Mode when quick bracking is applied to both Reels SRK VIDE...

Page 65: ...lope CH 2 NTSC SW 30Hz PAL SW 25Hz Head Switching Output Point RF Envelope Output Point Test Conditions VCR VCP State Play an Alignment Tape Adjustment Point Guide Roller Height Adjustment Screws Fig...

Page 66: ...Screw Fig C 5 3 A C Head Tape Tape 0 2 0 25mm P4 5 1 Preliminary Adjustment Height and Tilt Adjustment Perform the Preliminary Adjustment when there is no Audio Output Signal with the Alignment Tape...

Page 67: ...nt Screw C for Maximum Output of the 1Khz and 7Khz segments while maintaining the flattest Envelope differential between the two Frequencies Adjustment Procedure 5 3 Precise Adjustment Azimuth adjustm...

Page 68: ...st Conditions Mechanism Condition Play the blank tape Play an alignment tape Adjustment Points Guide Roller Precise Adjustment Switching Point Tracking Preset X Value Checking Adjustment Procedure Pla...

Page 69: ...on pinch roller If locations marked with o do not operate normally after cleaning check for wear and replace See the EXPLODED VIEWS at the end of this manual as well as the above illustrations See th...

Page 70: ...ch with Isopropyl Alcohol Touch the cleaning patch to the head tip and gently turn the head rotating cylinder right and left Do not move the cleaning patch vertically Make sure that only the buckskin...

Page 71: ...embly F L U Groove 4 Arm Take up Rubbing Section 5 L D Motor Worm Wheel Part 6 Shaft 7 Arm Assembly F L of Buming Inside Hole 8 Reel S T Shaft G381 Yellow 9 Brake T Groove Guide Rail Gear Assembly Up...

Page 72: ...sensor Check syscon circuit YES YES YES NO NO NO 1 Deck Mechanism A NO NO NO No F R modes Is the present mode F R Mode Is the mode SW assembled correctly Refer to Page 79 Is the normal voltage suppli...

Page 73: ...itions page 79 Check spring Pinch Replace Drum Motor Check Servo Syscon Check the Syscon COM No cassette loading Insert the cassette Check Cassette Carry Assembly Is there variation for F L S W Output...

Page 74: ...ors ok Check Syscon Circuit Check Syscon Circuit Check Servo Syscon Does the Capstan Motor turn Is the terminal voltage of the Drum Motor more than 2 3V Replace the Drum Motor Is the Vcc voltage of th...

Page 75: ...ard 5V YES Is there a short circuit between cassette switch and GND on main P C Board Remove the short circuit part or Replace the main P C Board NO Check Mode switch location and syscon circuit Repla...

Page 76: ...Assembly F L Check the power of L D Motor Is the Holder Assembly Cassette assembled correctly Replace the Rear Rack F L Does the Gear Rack F L work Does the Opener Door work Does the Arm Assembly F L...

Page 77: ...2 11 IKENOHATA 1 CHOME TAITO KU TOKYO 110 8710 JAPAN TEL 03 3827 3111 H251701 Printed in Singapore...