Toshiba MM20E45 - Page 83

14-2
2. Deflection Circuit Failure Diagnosis Procedures
No vertical scanning
Horizontal one line
Check +30V
power supply.
Check pin 2 voltage of
IC301. (Normal: 12V)
More than 20V.
Check pin 13 input
of IC302 with
synchronous scope.
Check pin 15 of IC302
with synchronous scope.
3V
Check output circuit.
NG
NG
OK
1.9V
Check pin 3 of
IC302 is +12V.
Replace IC302.
NG
Check pin 62 output
of Q501 with
synchronous scope.
5V
OK
NG
NG
Check voltage of pin 21
(ICH08), CH18 and RH99.
Replace Q501.
Check, repair and replace
FQ03, DQ10, CQ27, CQ37,
LQ15 and TQ01.
Check and repair L462,
R303, R304, R305, R306
in vertical output circuit.
Check and repair QH42,
D307, IC302, RH61
and R320.
Check and repair CH18 or
RH99.
Check and repair +12V
pattern from QH16.
Check and repair L302 and
+12V pattern from QH16.
OK
OK
NG
OK