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Troubleshooting
Power supply drive and protection diagrams and locations
F601
SW902
Fuse
AC IN
Thermal sw.
Fan Control
15.5V
1
K6J
2
6V
1
K6K
-6V
K6M
2
K6L
Q661
FAN DRIVE1
POWER BOARD
SW902
F601
SW904
P.F BOARD
SW904
Interlock sw.
TSW611
IC611
P.F.CONTROL
K6E
4
1
7
1
4
7
K6F
Power
Oscillator
Circuit
Failure: Low
P-FAIL
On: High
15.5V
On: High
5V_SW
On: High
LAMP BALLAST UNIT
1
1
K6D
CB1
3
3
CB2
1
3
FN905
FN906
1
3
1
K8B
K8N
37-38
K8P
K6S
K8S
LAMP_ERR
13-14
9-10
LAMP_BST_SW1
K6S
K8S
LAMP
LAMP_SW1
BALAST_AC1
5V_SW
15-16
FAN DRIVE1
11-12
MAIN BOARD
-36-
IC2881
IC4881
LAMP Ass'y
IC4881
TEMP. SENS.
1
3
2
5
K48E
TEMP. SENSOR
BOARD
2
3
5
K8E
Failure: High
IC2881
TEMP.SENSOR
1
2
47 80 81
Failure: Low
P-FAIL
48
IC1871
BUFFER
On: High
82
18
2
IC801
IC1881
BUFFER
SUB CPU
On: Low
3
12
8
9
39
11
On: High
3
17
1
On: High
5
15
41
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