Sanyo VHR-M261EV - System Circuit Diagram

3-333-32 3-34
3. System Circuit Diagram
9
8
765
4
3
2
1
10
WAVEFORM
IC502, ZD501 are defective.
LD Motor will not operate.
Q501, Q503 are defective.
µ-COM is unstable.
IC505 is defective.
VCR dead.
X501, X502 are
defective.
µ-COM will not
opreate.
VR501 is defective.
PB PG will not operate.
RS501, RS502, Q514,
Q515 are defective.
Auto stop occures.
ES501, ES502, LD501
are defective.
•Tape mode not Working.
(Tape remaining on reel.)
•Auto Rew not working.
R575, R576, R577, R578
are defective.
Deck will not operater.
IC504 is defective.
Reset is defective.
Set dead.
* IC501 Waveform Photographs
IC501 Pin 24
1V/5mS
REC/PB modes
(V.H/SW)
IC501 Pin 27
1V/2mS
QUE/REV modes
(D.V-SYNC)
IC501 Pin 31
1V/10mS
REC mode
(CTL+)
IC501 Pin 32
1V/10mS
REC mode
(CTL-)
IC501 Pin 38
1V/1mS
REC/PB mode
(DFG)
IC501 Pin 39
1V/10uS
REC/PB modes
(DPG)
IC501 Pin 40
1V/1mS
REC/PB modes
(CFG)
IC501 Pin 43
100mV/10uS
EE/PB modes
(V-IN)
IC501 Pin 45
500MV/10uS
EE/PB modes
(V-OUT)
IC501 Pin 54
1V/20uS
EE/PB modes
(C-SYNC)
BaseCollectorEmitter
PB RECPB RECPB REC
H/L
H/L
0.4
4.43
0.75
H/L
H/L
0.4
4.43
0.75
H/L
H/L
0.7
5.24
0
H/L
H/L
0.7
5.25
0
0
0
0
5.32
0
0
0
0
5.32
0
Q514
Q515
Q506
Q503
Q501
__
System IC Voltage Sheet
IC503
1
5
PB
REC
5.34
5.34
0.00
0.00
4.60
5.21
4.60
5.21
PB
REC
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
__
IC503 Voltage Sheet
PB REC PB REC PB REC PB REC PB REC
0
0
0.78
H/L
H/L
3.34
1
1
3.2
2.2
0.74
4.0
5.28
5.28
5.28
5.24
0
0
5.18
5.18
0
0
0.79
H/L
H/L
3.3
2
2
1.62
2.2
0
2.3
5.28
5.28
5.28
5.28
0
0
5.18
5.18
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
5.24
5.24
H/L
H/L
2.81
2.73
0
H/L
5.15
4.97
2.25
2.25
0
0
2.25
2.25
2.25
Pulse
Pulse
Pulse
5.24
5.24
H/L
H/L
2.81
2.73
0
H/L
5.15
4.88
2.99
2.2
0
0
2.25
2.25
2.25
Pulse
Pulse
Pulse
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
5.24
4.99
2.41
1.36
2.43
0
2.01
1.41
0
1.32
1.35
2.5
2.43
0.38
5.21
0
5.05
5.16
0
5.21
5.24
4.99
2.37
1.36
2.43
0
2.01
1.41
0
1.32
1.35
2.5
2.43
0.38
5.21
0
5.05
5.20
0
5.14
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
0
0
0
5.21
5.21
0
4.58
0
1.45
0.83
0
2.49
2.47
5.29
0
5.29
2.29
3.14
0
2.8
0
0
0
5.21
5.21
0
4.58
0
1.45
0.83
0
2.47
2.47
5.29
0
5.29
5.29
3.15
4.84
2.8
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
2.55
5.07
0
0
0
0
4.7
0
4.87
5.08
5.03
5.28
5.28
4.6
5.2
0
0
0
0
0
2.55
5.07
0
0
0
0
4.7
0
4.87
5.08
5.03
5.28
5.28
4.6
5.2
0
0
0
0
0
__
SYSTEM IC Voltage Sheet
• IC501(HD3977)