Power Failure Detection System; Error Information Table - Sanyo PLC-XT25 Service Manual

Chassis Description

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 tem-
perature failure occurs on the projector. The power failure detection lines "P_FAIL_S5V", "P_FAIL_15V", etc. are con-
nected to the main power supplies and fans. When the failure occurs, IC301<SYSTEM CONTROL> receives an error
information through the power failure detection lines and turns off the signal "LAMP_DC_ON" output from pin 111 to
stop the power supply.
The power failure detection signals are sent to IC1801<I/O EXPANDER> and then sent to IC301<SYSTEM CON-
TROL> .
diagnosis Information of Power Failure
Ic1801
detecting Signal Failure circuit/Parts
P_FAIL_1.8V 1.8V, 1.V and peripheral circuit on the Main Board
P_FAIL_S5V S5V, S1V, S9V and peripheral circuit on the Main Board
P_FAIL_15V 15V, 5V and peripheral circuit on the Main Board
P_FAIL_S1.V S 1.V and peripheral circuit on the Main Board
P_FAIL_S-5V S -5V and peripheral circuit on the Main Board
P_FAIL_PJ P J-Network Board and peripheral circuit on the Main Board
FAN_SPEED Failure of Fan, FN901, FN90, FN903, FN904, FN905 connected to the Power(DC) Board

Error information table

Ic Pin Signal Name
61 P_FAIL_1.8V
6 P_FAIL_S-5V
63 P_FAIL_S1.V
IC1801
64 P_FAIL_15V
65 P_FAIL_S5V
66 P_FAIL_PJ
FAN_SPEED5
103 (FAN_MTR5)
IC701 I I
108 FAN_SPEED1
(FAN_MTR1)
connection Lines
1.8V, 1,V
S-5V
S3.3V/FPGA, S.5V/FPGA/
S1.V
15V, 5V
S5V, S1V, S9V
PJ-Network Board, AV
FAN CONTROL
-90-
error Information
MAIN, 1./1.8V
MAIN, S-5V
FPGA, S1.V
MAIN, 15/9/5V
MAIN, SS5/S9/S1
PJ_N/AV, 3.3/S5V
FAN, FANLOCK
Failue Area
3.3V, 1.V, 1.8V line on
Main
S-5V line on Main, AV
S3.3V, S.5V, S1.V line on
Main
15V_PNL. 15V_LNS,
9V_LNS, 5V line on Main
S5V_TEMP, S5V_AUDIO,
S5V, S9V_AUDIO, S1V,
S5V_PW line on Main
PJ-Network Board, 3.3V,
S5V line on AV, Joint
Fan Control on Power(DC)