Table Of Contents - Aiwa HV-FX780 Service Manual

SPECIFICATIONS ............................................................ 3
ACCESSORIES LIST ....................................................... 3
DISASSEMBLY INSTRUCTIONS ..................................... 4
SERVICE POSITION ........................................................ 5
VCR TEST TAPE INTERCHANGEABILITY TABLE ........ 6
ELECTRICAL MAIN PARTS LIST .............................. 7 ~ 8
TRANSISTOR ILLUSTRATION ........................................ 8
WIRE HARNESS DIAGRAM ............................................ 9
BLOCK DIAGRAM ................................................. 10 ~ 16
SCHEMATIC DIAGRAM
1. POWER SECTION .............................................. 17 ~ 18
2. AUDIO/VIDEO SECTION .................................... 19 ~ 20
3. SYSTEM CONTROL/SERVO/OSD SECTION) .. 23 ~ 24
4. TUNER SECTION ....................................................... 25
5. FRONT 1 C.B .............................................................. 29
6. FRONT 2 C.B .............................................................. 29
WAVEFORM
1. VIDEO SECTION ........................................................ 21
2. SERVO/OSD SECTION .............................................. 22
FL DISPLAY .................................................................... 26
WIRING
1. MAIN C.B SECTION ........................................... 27 ~ 28
2. FRONT 1 C.B SECTION ............................................. 30
3. FRONT 2 C.B SECTION ............................................. 30
IC DESCRIPTION ................................................... 31 ~ 36
IC BLOCK DIAGRAM ..................................................... 37
ADJUSTMENT ........................................................ 38 ~ 39
MECHANICAL EXPLODED VIEW 1/1 ........................... 40
MECHANICAL MAIN PARTS LIST 1/1 ......................... 40
MECHANISM EXPLODED VIEW 1/3, 2/3, 3/3 ..... 42,44,46
MECHANISM MAIN PARTS LIST 1/3, 2/3, 3/3 .... 43,45,47
DECK MECHANISM PARTS LOCATIONS
Top View .......................................................................... 48
Bottom View .................................................................... 48
DECK MECHANISM DISASSEMBLY
1. Drum Assembly ......................................................... 49
2. Plate Assembly Top ................................................... 51
3. Holder Assembly CST ............................................... 51
4. Guide CST ................................................................ 51
5. Bracket Side (L)/Bracket Assembly Door .................. 51
6. Arm Assembly F/L ..................................................... 51
7. Lever Assembly S/W ................................................. 51
8. Arm Assembly Cleaner .............................................. 52
9. Head F/E ................................................................... 52
10. Base Assembly A/C Head ......................................... 52
11. Brake Assembly S ..................................................... 53
12. Brake Assembly T ..................................................... 53
13. Arm Assembly Tension .............................................. 53
14. Reel S & Reel T ........................................................ 53
15. Support CST ............................................................. 54

TABLE OF CONTENTS

16. Base Assembly P4 .................................................... 54
17. Opener Lid ................................................................ 54
18. Arm Assembly T/up ................................................... 54
19. Arm Assembly Pinch ................................................. 54
20. Belt Capstan/Motor Capstan ..................................... 55
21.Clutch Assembly D33 ................................................. 55
22. Lever F/R .................................................................. 55
23. Gear Assembly H-UP/D or Gear Assembly UP/D ..... 55
24. Bracket Assembly Jog ............................................... 56
25. Guide Rack F/L, Gear Rack F/L ................................ 56
26. Brake Assembly Capstan .......................................... 56
27. Gear Drive/Gear Cam/Gear Connector .................... 57
28. Bracket Assembly L/D motor ..................................... 57
29. Gear Sector ............................................................... 58
30. Base Tension/Plate Slider/Lever Tension .................. 58
31. Gear Assembly P3/Gear Assembly P2 ..................... 59
32. Base Assembly P3/Base Assembly P2 ..................... 59
33. Arm Assembly Idler Jog or Arm Assembly Idler ........ 59
DECK MECHANISM ADJUSTMENT
Tools and Fixtures for service ......................................... 60
1. Mechanism Alignment Position Check ........................ 61
2. Preparation for Adjustment ......................................... 62
3. Checking Torque ......................................................... 62
4. Guide Roller Height Adjustment .................................. 63
4-1. Preliminary Adjustment .......................................... 63
4-2. Precise Adjustment ................................................ 63
5. Audio/Control (A/C) Head Adjustment ......................... 64
5-1. Preliminary Adjustment .......................................... 64
5-2. Confirm that the Tape Path smoothly between the
Take-up Guide and Pinch Roller ............................ 65
5-3. Precise Adjustment (Azimuth Adjustment) ............. 65
6. X-Value Adjustment ..................................................... 65
7. Adjustment after Replacing Drum Assembly
(Video Heads) ............................................................. 66
8. Check the Tape Travel after Reassembling
Deck Mechanism ......................................................... 66
8-1. Checking Audio and RF Locking Time
during Playback and after CUE or REV ................ 66
8-2. Check for Tape Curling or Jamming ....................... 66
MAINTENANCE/INSPECTION PROCEDURE
1. Check before starting Repairs .................................... 67
2. Required Maintenance ................................................ 68
3. Scheduled Maintenance ............................................. 68
4. Supplies Required for Inspection and Maintenance ... 68
5. Maintenance Procedure .............................................. 68
5-1. Cleaning ................................................................. 68
5-2. Greasing ................................................................ 69
MECHANISM TROUBLESHOOTING GUIDE
1. Deck Mechanism ........................................................ 70
2. Front Loading Mechanism .......................................... 73
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