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Trouble Diagnosis Flowchart - Hitachi VK-S274R Service Manual

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Troubleshooting > Trouble Diagnosis

4-1-2 Trouble diagnosis flowchart

(1) No video (luminance) signal
NG
TL1539 : 5V
OK
NG
TL1540 : 3V
OK
NG
TL1532 : 2V
OK
NG
TL1533 : 15V
OK
NG
TL1534 : -7.5V
OK
NG
TL1522 : 7.2V
OK
NG
TL1529 :
Luminance signal
OK
IC1601 faulty
The test lands and components of circuit no. 1000-1099 are
on the SP circuit board.
The test lands and components of circuit no. 1100-1499 are
Refer to "(3) No power"
on the PC circuit board.
The test lands and components of circuit no. 1500 and higher
are on the CSR circuit board.
Refer to "(3) No power"
Refer to "(3) No power"
Refer to "(3) No power"
Refer to "(3) No power"
Refer to "(3) No power"
NG
TL1013 :
1
CCD output signal
OK
C1101 faulty or connect
NG
IC1101-27 :
the connections of circuit
CCD output signal
boards.
OK
NG
IC1101-43, 44, 45 :
Pulses
OK
NG
IC1101-16, 17,
18, 19 : Pulses
OK
NG
IC1101-2 to 11:
Pulses
OK
NG
IC1121-66:
Luminance signal
OK
Q1152 faulty.
IC1201 faulty.
IC1121 faulty.
IC1101 faulty.
NG
TL1154: 3V
Q1151 or D1151 faulty.
OK
IC1121 faulty.
4 - 2

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