Zenith ABV341 Series Service Manual page 112

SECTION 4 MECHANISM OF VCR PART
DECK MECHANISM PARTS
LOCATIONS
• Top View . . . . . . . . . . . . . . . . . . . . . . . . .4-1
• Bottom View . . . . . . . . . . . . . . . . . . . . . . .4-1
DECK MECHANISM DISASSEMBLY
1. Drum Assembly . . . . . . . . . . . . . . . . . . .4-2
2. Top Plate Assembly . . . . . . . . . . . . . . . .4-4
3. CST Holder Assembly . . . . . . . . . . . . . .4-4
4. Door Opener . . . . . . . . . . . . . . . . . . . . .4-4
5. L/D Motor Bracket Assembly . . . . . . . . .4-4
6. F/L Gear Rack . . . . . . . . . . . . . . . . . . . .4-4
7. F/L Arm Assembly . . . . . . . . . . . . . . . . .4-4
8. S/W Lever Assembly . . . . . . . . . . . . . . .4-4
9. Cleaner Arm Assembly . . . . . . . . . . . . . .4-5
10. F/E Head . . . . . . . . . . . . . . . . . . . . . . . .4-5
11. A/C Head Base Assembly . . . . . . . . . . .4-5
12. T Brake Assembly . . . . . . . . . . . . . . . . .4-6
13. RS Brake Assembly . . . . . . . . . . . . . . . .4-6
14. Tension Arm Assembly . . . . . . . . . . . . . .4-6
15. S Reel / T Reel . . . . . . . . . . . . . . . . . . .4-6
16. P4 Base Assembly . . . . . . . . . . . . . . . . .4-7
17. Lid Opener . . . . . . . . . . . . . . . . . . . . . . .4-7
18. Pinch Arm Assembly . . . . . . . . . . . . . . .4-7
19. T/up / Arm T/up Lever . . . . . . . . . . . . . .4-7
20. Capstan Belt /Capstan Motor . . . . . . . . .4-8
21. F/R Lever . . . . . . . . . . . . . . . . . . . . . . . .4-8
22. D35 Clutch Assembly . . . . . . . . . . . . . . .4-8
23. Capstan Brake Assembly . . . . . . . . . . . .4-8
24. Drive Gear / Cam Gear . . . . . . . . . . . . .4-9
25. Sector Gear . . . . . . . . . . . . . . . . . . . . . .4-9
26. Slider Plate . . . . . . . . . . . . . . . . . . . . . .4-9
27. Tension Lever . . . . . . . . . . . . . . . . . . . .4-9
28. Spring Lever . . . . . . . . . . . . . . . . . . . . .4-9
29. P2 Gear Assembly/
P3 Gear Assembly . . . . . . . . . . . . . . . .4-10
30. P2 Base Assembly/
P3 Base Assembly . . . . . . . . . . . . . . . .4-10
31. Loading Base . . . . . . . . . . . . . . . . . . . .4-11
32. Tension Base . . . . . . . . . . . . . . . . . . . .4-11
33. Idler Arm Jog Assembly . . . . . . . . . . . .4-11
DECK MECHANISM ADJUSTMENT
• Tools and Fixtures for Service . . . . . . .4-12
CONTENTS
1. Mechanism Alignment Position Check .4-13
2. Preparation for Adjustment . . . . . . . . . .4-14
3. Checking Torque . . . . . . . . . . . . . . . . .4-14
4. Guide Roller Height Adjustment . . . . . .4-15
4-1. Preliminary Adjustment . . . . . . . . .4-15
4-2. Precise Adjustment . . . . . . . . . . . .4-15
5. Audio/Control (A/C) Head Adjustment . .4-16
5-1. Preliminary Adjustment . . . . . . . . .4-16
5-2. Confirmation of Tape Path between
Pinch Roller and Take-up Guide . .4-17
5-3. Precise Adjustment
(Azimuth Adjustment) . . . . . . . . . .4-17
6. X-Value Adjustment . . . . . . . . . . . . . . .4-17
7. Adjustment after Replacing Drum Assembly
(Video Heads) . . . . . . . . . . . . . . . . . . .4-18
8. Check the Tape Travel after Reassembling
Deck Mechanism . . . . . . . . . . . . . . . . .4-18
8-1. Check Audio and RF Locking Time
during Playback after CUE or REV
8-2. Check Tape Curling or Jamming . .4-18
MAINTENANCE/INSPECTION
PROCEDURE
1. Check before starting Repairs . . . . . . .4-19
2. Required Maintenance . . . . . . . . . . . . .4-20
3. Scheduled Maintenance . . . . . . . . . . . .4-20
4. Supplies Required for Inspection and
Maintenance . . . . . . . . . . . . . . . . . . . .4-20
5. Maintenance Procedure . . . . . . . . . . . .4-20
5-1. Cleaning . . . . . . . . . . . . . . . . . . . .4-20
5-2. Greasing . . . . . . . . . . . . . . . . . . . .4-21
MECHANISM TROUBLESHOOTING
GUIDE
1. Deck Mechanism . . . . . . . . . . . . . . . . .4-23
2. Front Loading Mechanism . . . . . . . . . .4-26
EXPLODED VIEWS
1. Front Loading Mechanism Section . . . .4-28
2. Moving Mechanism Section (1) . . . . . . .4-29
3. Moving Mechanism Section (2) . . . . . . .4-30
. . . . . . . . . . . . . . . . . . . . . . . . . . .4-18