Sanyo PDG-DHT100L Service Manual page 127

Troubleshooting
Power (AC)
AC
F901
SW901
FUSE
MAINS
SWITCH
PFC1-2
Power (PFC)
CN1
1
2
PFC_CN3/PFC_CN4
Lamp-On: H
P-FAIL(CN3)/P-FAIL(CN4)
Error: L
Check that the lamp drive signals
(PFC_CN4, PFC_CN3) are correct.
Lamp-On: H
K6A
NOISE
FILTER
K6B
IC601
SWITCHING
POWER(AC)
RL1
Q101
RL2
IC101
Q102
IC102
Q103 Q105
CN6
7 6 1 2
POWER(DC)
IC631
POWER
CONVERTER
CONTROL
TRANSFORMER
IC632
POWER
CONVERTER
CONTROL
TRANSFORMER
Check that PFC_ON, ST_SW signals are correct.
Power-ON: PFC_ON: H, ST_SW:L
Standby: PFC_ON: L, ST_SW: L
CN3
PFC1
CIRCUIT
CN4
PFC2
CIRCUIT
PFC1-2
4
12VPFC voltage is supplyed from Power(DC) through
the thermal switches (SW903, SW904) and Lamp
cover switch (SW902).
-17-
D681
6V
T651
D683
-6V
PC671
Q681
PFC_ON
PC661
Power-On:H
D682
16V
T652
PC672
Q682
ST_SW
X1B X3B
BALLAST2
X2B
X1A X3A
BALLAST1
X2A
If the power failure occurs on the PFC1 or
PCF2 circuit, the detection signal (PF_PFC1,
PF_PFC2) becomes Low.
K6C
1
2
7
9
5
10
Power-On:L
LAMP2
LP902
LAMP1
LP901