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Troubleshooting
Power supply drive and protection diagrams and locations
SW902
SW905
Interlock sw.
AC IN
Thermal sw.
K66L,K66M
Q6603
1
12VF1
2
IC6603
IC6606
K66J
Q6626
K66K
12VF2
1
2
IC6602
IC6604
IC6607
16V
SUB POWER BOARD
K70E/K70F
1
2
I/F BOARD
F601
SW902
IC1872
SW905
IC1871
POWER BOARD
F601
Fuse
K6A
TSW601
IC601
P.F.CONTROL
16V
16V
3
4
Power
6V
6V
9
Oscillator
11
Circuit
-5V
-5V
2
CN66A
CN6A
15
16V
Q6604
Q6624
FAN_SW
Q6623
P.FAIL
15V
Q6613/Q6614
IC_RST
K66D
K66N
1
K70D
FAN_DRIVE
IC1691
LAMP BALLAST UNIT
1
1
K7A
3
3
K7B
1
3
1
3
K8L
IC3381
9V
Q3571
SDA
8
SCL
9
LAMP_SW
LAMP_ERR
LAMP_DET.
Q4807
6
FAN_DRIVE
FAN_SW
P.FAIL
5
IC_RESET
4
10
FAN_CS1
11
FAN_CS2
K8D
MAIN BOARD
K8Y
1
2
1
2
-36-
LAMP Ass'y
IC1691
TEMP. SENS.
1
3
2
5
K16I
SENSOR1
BOARD
3
5
K8X
IC1871
5V
TEMP.SENSOR
1
2
IC1872
TEMP.SENSOR
1
2
52 51
On: High
138
Failure: High
123
On: High
137
IC801
Failure: Low
MAIN CPU
125
On: Low
2
110
111
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