Service Manuals, User Guides, Schematic Diagrams or docs for : AIWA Video HV-GX935 hv-fx990_5700_7750_gx915_935_828

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                                              HV-FX7750                               LE

                                              HV-FX5700                               LE

                                              HV-FX990                                LE

                                              HV-GX935                                LE

                                              HV-GX915                                LE




             HV-FX7750, FX5700                             HV-FX990, GX935, GX915




     SERVICE MANUAL
STEREO VIDEO CASSETTE RECORDER <7750/5700>
                                                    BASIC VIDEO MECHANISM
                                                       : D33K-4HF/PAL(6721R-0250B)<7750,5700>
VIDEO CASSETTE RECORDER <990/935/915>                  : D33K-4HD/PAL(6721R-0230B)<990>
                                                       : D33K-2HD/PAL(6721R-0212A)<935,915>




      This Service Manual is the "Revision Publishing" and replaces "Simple Manual"
      (S/M Code No. 09-007-347-2T1).
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                             S/M Code No. 09-007-347-2R1
                                                                    TABLE OF CONTENTS
SPECIFICATIONS ............................................................ 3                  9. Head F/E ................................................................... 70
ACCESSORIES LIST ....................................................... 3                    10. Base Assembly A/C Head ........................................ 70
DISASSEMBLY INSTRUCTIONS ..................................... 4                              11. Brake Assembly S .................................................... 71
SERVICE POSITION ........................................................ 5                   12. Brake Assembly T .................................................... 71
VCR TEST TAPE INTERCHANGEABILITY TABLE ........ 6                                             13. Arm Assembly Tension ............................................. 71
ELECTRICAL MAIN PARTS LIST .............................. 7 ~ 9                               14. Reel S & Reel T ....................................................... 71
TRANSISTOR ILLUSTRATION ........................................ 9                            15. Support CST ............................................................ 72
WIRE HARNESS DIAGRAM .......................................... 10                            16. Base Assembly P4 ................................................... 72
BLOCK DIAGRAM ................................................. 11 ~ 22                       17. Opener Lid ............................................................... 72
SCHEMATIC DIAGRAM                                                                             18. Arm Assembly T/up .................................................. 72
 1. POWER/TUNER/NICAM <7750/5700> ............. 23 ~ 24                                       19. Arm Assembly Pinch ................................................ 72
 2. POWER/TUNER <990/935/915> ....................... 25 ~ 26                                 20. Belt Capstan/Motor Capstan .................................... 73
 3. AUDIO/VIDEO SECTION ................................... 29 ~ 30                           21.Clutch Assembly D33-K ............................................ 73
 4. Hi-Fi AUDIO/SCART <7750/5700> .................... 31 ~ 32                                22. Lever F/R ................................................................. 73
 5. SCART <990/935/915> ...................................... 33 ~ 34                        23. Gear Assembly H-Up/D-K or
 6. SYSTEM CONTROL/SERVO                                                                          Gear Assembly Up/D-K ............................................ 73
    <7750/5700> ...................................................... 35 ~ 36                24. Bracket Assembly Jog .............................................. 74
 7. SYSTEM CONTROL/SERVO                                                                      25. Guide Rack F/L, Gear Rack F/L ............................... 74
    <990/935/915> ................................................... 39 ~ 40                 26. Brake Assembly Capstan ......................................... 74
 8. KEY1 <7750/5700> .................................................... 47                  27. Gear Drive/Gear Cam/Gear Connector ................... 75
 9. KEY2 <7750/5700> .................................................... 47                  28. Bracket Assembly L/D motor .................................... 75
 10. KEY1 <990/935/915> ............................................... 49                    29. Gear Sector .............................................................. 76
 11. KEY2 <990/935/915> ............................................... 49                    30. Base Tension/Plate Slider/Lever Tension ................. 76
WAVEFORM                                                                                      31. Gear Assembly P3/Gear Assembly P2 .................... 77
 AUDIO/VIDEO SECTION ............................................... 28                       32. Base Assembly P3/Base Assembly P2 .................... 77
 SYSTEM CONTROL/SERVO SECTION ....................... 38                                      33. Arm Assembly Idler or Arm assembly Idler Jog ........ 77
VOLTAGE CHART                                                                                DECK MECHANISM ADJUSTMENT
 1. POWER SECTION ..................................................... 25                   Tools and Fixtures for service ......................................... 78
 2. AUDIO/VIDEO SECTION ........................................... 27                        1. Mechanism Alignment Position Check ....................... 79
 3. Hi-Fi AUDIO/SCART SECTION ................................. 33                            2. Preparation for Adjustment ........................................ 80
 4. SYSTEM CONTROL/SERVO SECTION ................... 37                                       3. Checking Torque ........................................................ 80
FL DISPLAY ............................................................ 41 ~ 42               4. Guide Roller Height Adjustment ................................. 81
WIRING                                                                                         4-1. Preliminary Adjustment .......................................... 81
 1. MAIN C.B <7750/5700> ..................................... 43 ~ 44                         4-2. Precise Adjustment ................................................ 81
 2. MAIN C.B <990/935/915> .................................. 45 ~ 46                         5. Audio/Control (A/C) Head Adjustment ........................ 82
 3. KEY1 C.B <7750/5700> ............................................. 48                      5-1. Preliminary Adjustment .......................................... 82
 4. KEY2 C.B <7750/5700> ............................................. 48                      5-2. Confirm that the Tape Path smoothly between
 5. KEY1 C.B <990/935/915> .......................................... 50                            the Take-up Guide and Pinch Roller ..................... 83
 6. KEY2 C.B <990/935/915> .......................................... 50                       5-3. Precise Adjustment (Azimuth Adjustment) ............. 83
 7. NICAM C.B ................................................................. 51            6. X-Value Adjustment .................................................... 83
ADJUSTMENT ........................................................ 52 ~ 53                   7. Adjustment after Replacing Drum Assembly
IC DESCRIPTION ................................................... 54 ~ 57                      (Video Heads) ............................................................. 84
MECHANICAL EXPLODED VIEW 1/1 ........................... 58                                   8. Check the Tape Travel after Reassembling
MECHANICAL MAIN PARTS LIST 1/1 ......................... 59                                     Deck Assembly ............................................................ 84
MECHANISM EXPLODED VIEW 1/3~3/3 .............. 60 ~ 64                                         8-1. Checking Audio and RF Locking Time
MECHANISM MAIN PARTS LIST 1/3~3/3 ............. 61 ~ 65                                             during Playback and after CUE or REV ................ 84
DECK MECHANISM PARTS LOCATIONS                                                                 8-2. Check for Tape Curling or Jamming ....................... 84
Top View .......................................................................... 66       MAINTENANCE/INSPECTION PROCEDURE
Bottom View .................................................................... 66           1. Check before starting Repairs ................................... 85
DECK MECHANISM DISASSEMBLY                                                                    2. Required Maintenance ............................................... 86
  1. Drum Assembly ......................................................... 67               3. Scheduled Maintenance ............................................ 86
  2. Plate Assembly Top ................................................... 69                4. Supplies Required for Inspection and Maintenance .. 86
  3. Holder Assembly CST ............................................... 69                   5. Maintenance Procedure ............................................. 86
  4. Guide CST ................................................................ 69             5-1. Cleaning ................................................................. 86
  5. Bracket Side (L)/Bracket Assembly Door .................. 69                              5-2. Greasing ................................................................ 87
  6. Arm Assembly F/L ..................................................... 69               MECHANISM TROUBLESHOOTING GUIDE
  7. Lever Assembly S/W ................................................. 69                  1. Deck Mechanism ............................................... 88 ~ 90
  8. Arm Assembly Cleaner .............................................. 70                   2. Front Loading Mechanism ................................. 91 ~ 92



                                                                                         2
                                                            SPECIFICATIONS

                                                   
Video recording system   Rotary 2 head helical scanning system               Video recording system         Rotary 2 head helical scanning system
Video head               Double azimuth 4 heads                              Video head                     Double azimuth 2 heads
Tuner system             Frequency synthesized tuner                         Tuner system                   Frequency synthesized tuner
TV system                B/G, L/L' SECAM, B/G PAL                            TV system                      B/G, L/L' SECAM, B/G PAL
Video signal system      SECAM/MESECAM/PAL color signal,                     Video signal system            SECAM/MESECAM/PAL color signal,
                         625 lines, 50 fields                                                               625 lines, 50 fields
Usable cssettes          VHS video cassettes                                 Usable cssettes                VHS video cassettes
Recording/playback time PAL/SECAM/MESECAM                                    Recording/playback time        PAL/SECAM/MESECAM
                           SP: 5 hours max. with E-300 tape.                                                  5 hours max. with E-300 tape.
                           LP: 10 hours max. with E-300 tape                                                NTSC (Playback only)
                         NTSC (Playback only)                                                                 3 hours 30 minutes max.
                           SP: 3 hours 30 minutes max.                                                        with T-210 tape
                                with T-210 tape                              Tape speed                     PAL/SECAM/MESECAM
                           LP: 7 hours max.                                                                   23.39 mm/s
                                with T-210 tape                                                             NTSC (Playback only)
                           EP: 10 hours 30 minutes max.                                                       33.35 mm/s
                                with T-210 tape                              Rewind time:                   Approx. 3 min. with E-180 tspe
Tape speed               PAL/SECAM/MESECAM                                   Channel coverage               VHF-low: C02 to C12, C13 to C20
                           SP: 23.39 mm/s                                                                   UHF: C21 to C69
                           LP: 11.69 mm/s                                                                   CATV: S01 to S41
                         NTSC (Playback only)                                Video input                    0.5 - 2.0 Vp-p, 75 ohm, unbalanced
                           SP: 33.35 mm/s                                    Video output                   1.0 Vp-p, 75 ohm, unbalanced
                           LP: 16.67 mm/s                                    Horizontal resolution          240 lines
                           EP: 11.12 mm/s                                    Video S/N                      43 dB
Rewind time:             Approx. 3 min. with E-180 tspe                      Audio track                    1 track (Normal sound)
Channel coverage         VHF-low: C02 to C12, C13 to C20                     Audio input                    SCART: -6 dB, 10 k ohm
                         UHF: C21 to C69                                                                    RCA: -6 dB, 47 k ohm 
                         CATV: S01 to S41                                    Audio output                   SCART: -6 dB, less than 1 k ohm
Video input              0.5 - 2.0 Vp-p, 75 ohm, unbalanced                  Operating temperature:         5 



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