CTX EX-710F, Service Manual

Page: 28 / 101

7.0TROUBLESHOOTING CFA1797B
Linearity
CHECK T302, Q303, Q304, R334
L301AND THEIR
PERIPHERAL PARTS
START
DOES PICTURE LEFT
SQUARE MORE BIG THAN
RIGHT SQUARE (OR RIGHT
MORE BIG THAN LEFT)
NG
END
DOES PICTURE LEFT AND
RIGHT SQUARE MORE BIG
THAN MIDDLE
OK
CHECK Q319,Q320,Q321
Q322
CHECK GATES VOLTAGE
OF Q315,Q316,Q317,Q318
ARE "H","H","H",”H” WHERE
TIMING IS 31K
NG
CHECK GATES VOLTAGE
OF Q315,Q316,Q317,Q318
ARE "L","L","L",”L” WHERE
TIMING IS VESA-68K
END
OK
CHECK Q315,Q316,
Q317,Q318,C353,C359,C361
C362 AND THEIR
PERIPHERAL PARTS
END
OK
NG
OK
OK
NG
(LINEAR COIL)
(CS)
REMARK: 1. “L” means the voltage between gate and source is

4V which can’t turn on the MOSFET.
2. “H” means the voltage between gate and source is

4V which can turn on the MOSFET.
24 CTX
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