Sanyo PLC-XF30 Service Manual page 25

TEMPERATURE ABNORMALITY -2
Check the fan control circuit
BUFFER
FAN
ON/OFF
SIGNAL
From pin4 of IC6611
H : ON L : OFF
VOLTAGE
CONTROL
SIGNAL
From IC6611
CHECK !
Troubleshooting
CHECK !
CHECK !
FAN DRIVE
OUTPUT
VOLTAGE CONTROL OUT
CHECK !
-32-
Waveforms
Terminal board-AV Video-in
NTSC
0.5V/Div
TP_32H1
H_sync 2V/Div
TP_5101
C 0.5V/Div
TP_5102
Y 0.5V/Div
TP_3141
C 0.5V/Div
TP_3142
Y 0.5V/Div
TP_5181 TP_2301R
Red 0.5V/Div 0 . 5 V / p _ p
TP_201 TP_820R
0.5V/Div 0.5V/Div
TP_5182 TP_2301G
Green 0.5V/Div 0 . 5 V / p _ p
TP_211 TP_820G
0.5V/Div 0.5V/Div
TP_5183 TP_2301B
Blue 0.5V/Div 0 . 5 V / p _ p
TP_221 TP_820B
0.5V/Div 0.5V/Div
-33-
Timing chart
1 0 u s / D i v