Trouble Diagnosis Flowchart - Hitachi VK-U174 Service Manual

Troubleshooting > Trouble Diagnosis

4-1-2 Trouble diagnosis flowchart

(1) No video (luminance) signal
No
TL3005 or TL2501 :
5V
Yes
No
TL3006 or TL4006 :
3V
Yes
No
TL3007 or TL1212 :
2V
Yes
No
TL3008 : 15V
Yes
No
TL3009 : -7V
Yes
No
TL4023 : 6V
Yes
No
IC3104-2 :
Luminance signal
Yes
IC3104 faulty
Refer to "(3) No power"
3000 and higher
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"
No
TL1015 or TL2002 :
1
CCD output signal
Yes
C2002 faulty or connect
No
IC2001-22 :
the connections of circuit
CCD output signal
boards.
Yes
No
IC2001-33, 34, 35 :
Pulses
Yes
No
IC2001-12,
15 to 17 : Pulses
Yes
No
IC2001-1 to 9,
36 : Pulses
Yes
No
R2151 :
Luminance signal
Yes
Q2151 faulty.
Circuit No. Circuit Board
1000 to 1099 SP
1100 to 2999 PC
CSR
[Continued on next page]
IC2507 faulty.
IC2052 faulty.
IC2001 faulty.
No
TL1114 : 3V
Q2153 or D2151 faulty.
Yes
IC2052 faulty.
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