Power Fail Circuit - Sanyo PDP-32H1EV Service Manual

■ Power Fail Circuit

CPU (IC801) is programmed that the set goes to standby mode when there is circuit fail as
below.
1. AUDIO AMP FAIL(2) : Detected the fail of Audio AMP IC (IC071)
2. POWER FAIL (3) : Detected the voltage fail in Audio Unit (3 points)
3. POWER FAIL (1) : Detected the voltage fail in Audio Unit (1 point) and Main Unit (6 points).
4. OTHERS
TEMPERATURE FAIL : Detected the temperature fail ( about 80 degree) by thermal sensor IC (IC1981). CPU
FAN FAIL : Detected the fan fail by the communication to FAN & Sensor Control IC (IC1821).
IC801
52
FAN FAIL
TEM. FAIL 78
55
P FAIL 2
56
P FAIL 3
54
P FAIL 1
communicates to FAN & Sensor Control IC (IC1821) for detection.
(The set does not go to standby mode in this fail. Display Only.)
FAN Fail Detect (To IC1821 37 )
Temperature Fail Detect (To IC1821 38 )
Sound AMP. Fail Detect (To IC071 17 )
Power Fail Detect
(ASSY PWB AUDIO)
D1865
D1863/4
D1861/2
Power Fail Detect
(ASSY PWB MAIN)
D105
Q1861/2
D7082/3
(ASSY PWB
D201/2
AUDIO)
D603/4
D601/2
D301/2
D7080/1
9V
12V
30V
5V
(ASSY PWB AUDIO)
2.5VGR
3.3V
(To IC207)
3.3V
2.5V
2.5VST
3.3VYC
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