Sony KF-60DX100 Service Manual page 9

6. Self-Diagnosis function operation
When lamp cover SW is opened then pin 4 of CN1908 on the A board is high, LCD Engine µ-com (IC9502)
3 : Lamp Cover
detects it and make turn off the lamp.
When FAN1 or FAN2 is stopped then pin 8 or q; of CN1908 on the A board is high, LCD Engine µ-com
4 : FAN Stop
(IC9502) detects it and make turn off the lamp.
When lamp is not turned on then pin wl of LCD Engine µ-com (IC9502) is high, checks pin wk of LCD Engine
5 : Lamp Driver
µ-com . If pin wk is low, it is judged no High Voltage.
6 : Low B Detect +5 V line failure.
9 : Audio When DC is appeared by audio amp failure at speaker line.
Then it is detected by MAIN µ-com (IC9004) and it turns off the main power.
When lamp is not turned on then pin wl of LCD Engine µ-com (IC9502) is high, checks pin wk of LCD Engine
LAMP : Lamp error
µ-com. If pin wk is high, it is judged lamp is burned out.
Self-Diagnosis block diagram
IC9004
MAIN CPU
24 AUDIO PROT
43 LOW B ERR
IC9005
6. Low B
+5V DETECT
9. Audio
M board
IC9502
LCD ENGINE
3. Lamp Cover
LAMP COV 27
Q9505,9507-9509
HV DET
HV DETECT
LAMP DRV 28
LAMP PROT
LAMP PROT 29
4. FAN Stop
FAN PROT 24
+5V
Q1211, 1213,1215
AUDIO AMP
DC DETECT
– 8 –
A board
CN1908
4
12
3
D1902
8
D1901
10
IC1203, 1204
KF-60DX100
T board
S8001
LAMP COV
HV DET
LAMP
LAMP
LAMP PRT
DRIVER
FAN1 PR
FAN1
FAN2 PR
FAN2
RM-Y910