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VCR 4500
Sanyo VCR 4500 User Manual
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Manual
Specs
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13
15
Table of Contents
Specification
1
Features
1
Safety Precautions
2
Leakage Current Check
2
Table of Contents
3
Cabinet Disassembly
4
Circuit Board Disassembly
5
Circuit Board Locations
5
Removal of the Main Circuit Board
6
Video Circuit (VD-1)
6
System Control Circuit (SY-1)
6
Tuner Circuit (TN-2, TN-3)
6
Tuner and if Circuit (TN-1)
7
Power Supply Circuit (PW-1, PW-2)
7
Antenna Terminal Board (TB-1)
7
System Control Circuit and Terminal Board (SY-2, TB-2)
7
Timer Circuit (TM-1)
8
Circuit Adjustment
9
Preparations for Adjustment
9
Equipment
9
Set-Up
9
Specified In/Output Level and Impedance
11
Color Bar Signal
11
Adjustment Steps
12
Power Supply Circuit Checks
12
System Control Circuit Checks and Adjustments
13
Power Supply Voltage Check
13
Counter Memory Check
13
Tape Looseness Check
13
Servo Circuit Adjustments
14
Still-Frame Brake
16
Still-Frame Brake Timing
16
Video Circuit Adjustments
18
Setting before Adjustment
18
Pre-Amplifier Frequency Response
19
D.O.C. Sensitivity
19
3.58Mhz Oscillation Frequency
20
A.g.C.
20
Comb Filter
20
Video Output Level
21
A.C.C. Level
21
4.27Mhz B.P.F.
21
Chrominance Signal Carrier Leak
21
Noise Canceller
22
Luminance Signal Playback Level
22
Color Signal Recording Current
22
Monochrome (Luminance) Signal Recording Current
23
Sync Tip Carrier Frequency and FM Frequency Deviation
23
Special Playback Dummy V (Vertical) Sync Insert Position
23
Circuit Board VD-1, AD-1
24
Audio Circuit Adjustments
25
Bias Level and Oscillation Frequency Check
25
A.L.C. Output Check
25
Recording Current Level Check
25
Overall Frequency
26
Recording/Playback Output
26
Playback Audio Level Check
26
S/N Ratio Check
26
Timer Circuit Checks
28
Clock 2 Check
28
Reset Input (L Level) Input Check
28
Tuner Circuit Adjustments
29
Mechanism Adjustment
30
Jigs and Tools for Adjustment
30
Removal Fron Loading Mechanism Assembly
32
Direction of Movement of the Cassette Holder for Manual Operation
33
Operation of the VCR Once the Front Loading Mechanism Assembly Has Been Removed
33
Maintenance Timetable
35
Mechanism Repair and Parts Replacement
36
Video Head
36
Cleaning the Audio/Control Head and Full-Erase Head
36
Pinch Roller
37
Tape Path
37
Supply Reel Base
37
Take-Up Reel Base
38
Reel Base Drive Gear Assembly
38
Back Tension Brake Band
39
Audio/Control Head Assembly
40
FWD Sensor
40
REW Sensor
40
Capstan Motor
41
Loading Motor
42
Loading Ring
42
Reel Motor
45
Video Head Disc
45
Slip Roller Assembly and Belt
46
Adjustments
47
Front Loading Motor
47
Reel Base Height
47
Back Tension Lever Position
48
Winding Torque
48
Tape Path Adjustments
50
Back Tension Guide Vertical Position
50
Full-Erase Head Tape Guides
51
Audio/Control Head Tape Guides
52
Audio/Control Head
53
Tracking
53
Using Method of Mechanism Jig
54
Confirmation and Adjustment of the Level Difference between Video Heads a and B
55
4
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Sanyo VCR 4500 Specifications
General
Tape Format
VHS
Heads
2
Audio
Mono
Timer
Yes
Remote Control
Yes
Playback Speed
SP, LP
Tuner
Yes
Inputs
RF
Outputs
RF
Power Supply
120V AC
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