Power Failure Detection System - Sanyo PLC-WM4500L Service Manual

Troubleshooting

Power failure detection system

detection of Power failure
Projector provides a protection circuit to prevent the secondary failure when the power failure, fans failure or tempera-
ture failure occurs on the projector. The power failure detection lines "PF_IC_S3.3V", "PF_LNS", etc. are connected
to the main power supplies. When the failure occurs, IC301<SYSTEM CONTROL> receives an error information
directly or through IC4801 <I/O Expander> and then outputs the signal "LAMP_DC_ON" from pin 32. The signal
"LAMP_DC_ON" is supplied to power supply circuit to control the power supply operation.
Error information table
Ic Pin Signal Name
179 PF_IC_3.3V
180 PF_LNS
IC301
PW392
69 PF_12V_ID
282 PF_S-6V_AV
68 PF_FAN
343 FILTER_DET
61 PF_S5V_AV
62 PF_MAIN
IC4801
TE7783
63 PF_5V_MAIN
64 P_FAIL_LAN
connection Lines
15.5V, D3.3V_AD, S5VSI, S3.3VSI,
S3.3VSH, S3.3V, S1.2VSI, 2.5V_DI,
1.8VDDI
15V_LNS, 9V_LNS
12V, S12V
S-5V
Fans Voltage & Fan Lock
Filter Cartridge Detection
Not used
S5V, S5VL,6V
5V
3.3V LAN
-79-
error Information Failure Area
Panel S/H, A/D, Video Select, Panel
PF_IC_S3.3V
Drive, Gamma Drive on the Main
Lens Shift, Zoom, Focus Drive on
PF_LNS
Main
PF_12V_ID Audio I/O, Lamp ID on Main
AV, S-6V S-6V, S-5V on Main
PF_FAN S16V Fans Drive and Fan Lock
FILTER, DET Filter Cartridge Detection
PF_MAIN Main S5V, RGB Video, 6V on Main
MAIN, 5V 5V on Main
LAN, 3.3V 3.3V LAN