Zenith XBV613 Service Manual - Page 15

Zenith XBV613 - DVD/VCR Combination Manual

Page 15 highlights

(2) No 5.0V_D No 5.0V_D YES Is the Vcc(5.3V) sup- NO plied to Q165 Emittor? YES Is the Q162 Base NO 'H'? YES Check or Replace Q165 Check or Replace D125 Check the PWR CTL "H" signal from µ-com (3) No 5.0V_T No 5.0V_T YES Is the Vcc(5.3V) sup- NO plied to Q163 Emittor? YES Is the Q162 Base NO 'H'? YES Check or Replace Q163 Check or Replace D125 Check the PWR CTL "H" signal from µ-com (4) No 3.3V No 3.3V YES Is there about 3.8V NO at IC131 pin1? YES Is there about 3.3V~5V NO at IC131 pin4? YES Check IC131 and Replace Check or Replace D123 Check the PWR CTL "H" signal from µ-com (5) No 33V No 33V YES Is the Vcc(33V) sup- NO plied to Q161 Emittor? YES Is Q162 Base NO 'H'? YES Check or Replace Q161 Check or Replace D121 Check the PWR CTL "H" signal from µ-com 3-4

  • 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
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128

3-4
No 33V
Is the Vcc(33V) sup-
plied to Q161 Emittor?
Check or Replace
D121
Is Q162 Base
H
?
Check the PWR CTL
H
signal from μ-com
Check or Replace
Q161
YES
YES
YES
(5) No 33V
No 5.0V_D
Check or Replace
D125
Is the Vcc(5.3V) sup-
plied to Q165 Emittor?
Check or Replace
Q165
Is the Q162 Base
H
?
NO
NO
Check the PWR CTL
H
signal from μ-com
YES
YES
YES
(2) No 5.0V_D
No 5.0V_T
Check or Replace
D125
Check the PWR CTL
H
signal from μ-com
Is the Vcc(5.3V) sup-
plied to Q163 Emittor?
Is the Q162 Base
H
?
Check or Replace
Q163
NO
NO
YES
YES
YES
(3) No 5.0V_T
No 3.3V
Check or Replace
D123
Is there about 3.8V
at IC131 pin1?
Is there about 3.3V~5V
at IC131 pin4?
NO
NO
Check the PWR CTL
H
signal from μ-com
NO
NO
YES
YES
Check IC131
and Replace
YES
(4) No 3.3V