No Zoom Operation - Hitachi VK-S274 Service Manual

( 3 ) N O Z O O M O P E R A T I O N
NO
Does focus operate
normally?
YES
Check the NG
zoom switch unit.
OK
Check IC1201 and
EEPROM
NG
When power turned on:
TL1336:PULSE
OK
OK
TL1331-TL1334:PULSES
NG
NG
IC1301-2,10,29:5V
OK
NG
IC1301-12,20:9V
OK
NG
IC1301-28:PULSE
OK
2
See "(1) No zoom and
focus operation."
Zoom switch faulty.
1
Lens block faulty.
Check the 5V line
Check the +B line
IC1201 faulty.
1
NG
Check the connections
of the lens flat cable.
OK
NG
TL1346:3V
OK
NG
TL1335:PULSE
OK
Lens block faulty.
2
NG
IC1301-3:PULSE
OK
NG
IC1301-4:PULSE
OK
NG
IC1301-30:PULSE
OK
IC1301 faulty
Correct the connections
of the flat cable.
Check the 3V line
IC1201 faulty.
R1215 faulty.
Q1201 faulty.
IC1201 faulty.
IC1201 faulty.
IC1201 faulty.