-128-
Troubleshooting
AC
F901
FUSE
SW901
MAINS
SWITCH
NOISE
FILTER
PFC1-2
POWER(AC)
PO
WER (DC)
K6A
K6B
K6C
PFC_ON
ST_SW
IC631
POWER
CONTROL
IC601
SWITCHING
T651
CONVERTER
TRANSFORMER
D681
6V
PC671
PC661
D683
-6V
IC632
POWER
CONTROL
T652
CONVERTER
TRANSFORMER
D682
Q682
Q681
16V
PC672
1
2
7
9
5
10
Power-On:L
Power-On:H
Power (AC)
PFC1-2
POWER(DC)
PO
WER(A
C)
CN6
CN1
CN4
PFC1
CIRCUIT
PFC2
CIRCUIT
Q102
Q103
Q105
Q101
RL1
1
2
RL2
IC102
IC101
CN3
PFC_CN3/PFC_CN4
Lamp-On: H
P-FAIL(CN3)/P-FAIL(CN4)
Error: L
LAMP1
LP901
BALLAST1
X1A
X2A
X3A
LAMP2
LP902
BALLAST2
X1B
X2B
X3B
PFC_CN4
PFC_CN3
P-F
AIL(CN4)
P-F
A
IL(CN3)
12VPFC
7
6
2
1
4
Power (PFC)
Check that PFC_ON, ST_SW signals are correct.
Power-ON: PFC_ON: H, ST_SW:L
Standby: PFC_ON: L, ST_SW: L
Check that the lamp drive signals
(PFC_CN4, PFC_CN3) are correct.
Lamp-On: H
12VPFC voltage is supplyed from Power(DC) through
the thermal switches (SW903, SW904) and Lamp
cover switch (SW902).
If the power failure occurs on the PFC1 or
PCF2 circuit, the detection signal (PF_PFC1,
PF_PFC2) becomes Low.
DS+750 Service Manual
020-000211-01 Rev. 1 (06-2009)
Summary of Contents for DS+750
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