No Power - Sanyo PLC-WM4500L Service Manual

Troubleshooting

No Power

The POWER and LAMP indicators do not light
If the POWER and LAMP indicators are not lighting, check the
Fuse (F601) and Thermal switch (SW902) in the primary circuit
and SB_5V of standby power supply circuit.
- Fuse opens when the primary circuit has a error.
- Thermal switch opens when surrounding temperature of lamp
reaches around 115ºC.
AC
Check that POWER FAIL sig-
nals are correct.
L : Abnormality
Error: L
PF_FAN
Error: L
P.FAIL
COOLING
FANS
IC4801
IC7801
EXPANDER
DAC
<TE7783>
FAN
CONTROL
<M62393>
LAMP indicator lights and other indicators blink
If the LAMP indicator is lighting and other indicators are blink-
ing, the projector detects an abnormal inside the projector.
Check following points;
- Check the secondary power supply. Error on the low power
voltage
- Check the fan operation. Error on the fan.
- Check the filter cartridge detecting switch (SW1891).
SW1891 open: Error
- Check the signal FILTER_DET supplied to IC301.
FILTER_DET Low: Error
F601
K6AA FUSE
A902
POWER
32
68
154
PW_MASTER_SDI
IC301
251
PW_MASTER_SDO
SYSTEM
CONTROL
41
PW_MASTER_SCK
&
SCAN
343
CONVERTER
<PW392>
I/O
281
PRESS_SENS
PW_SDA0/SCL0 PW_SDA0/SCL0
Check that IIC Bus
signals are correct.
The LAMP indicator lights and LAMP REPLACE indicator is
flashing
If the LAMP_SWIN signal is not supplied to the Lamp Ballast, the
projector cannot be turned on. Check the follows;
- Check the lamp cover and the lamp cover switch (SW901).
SW901--open: Abnormality
- Check the signals LAMP_SWIN, CHO_TXD, CHO_RXD output from
IC9885.
SW902
THERMAL
PROTECTOR
K6B
LOW K6A
RL601
POWER
SB_5V
SUPPLY
S16V
POWER
S6V
SUPPLY
S-6V
K6R
1 29
1 29
K8R
POWER-ON:H
Network Standby: H
LAMP_DC_ON
Eco Standby: L
10
POWER_SW
8
14
LAMP_SWIN
IC9885
7
SUB-MICON
15
<LC87F2G>
CHO_TXD
9
16
CHO_RXD
IC886
PRESS
SENSOR
Check that the Power on/off signals are correct.
- POWER_SW H: Network Standby / L: Eco Standby
- LAMP_DC_ON H: Power-on
-65-
CJ1
A901
LAMP
BALLAST
CJ2
5 1 4
5 1 4
K8K
K8B
Q1861
PF_FAN
2
4
POWER-ON:H
1
IC1853
IC1854
INVERTER
1 2
K8E
S3.3V
5 3
FILTER_DET
IC1816
TEMP
SENSOR B
<LAMP>
K8A
MAIN
K8S
LAMP
LP900
LAMP
COVER SW.
3
SW901
1
FILTER SW.
1
SW1891
3
IC1692
TEMP
SENSOR A
<ROOM>
IC1814
TEMP
SENSOR C
<PANEL>