-89-
Troubleshooting
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 145 of
IC301 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 3.3V, 2.5V,1.8V and peripheral circuit on the Main Board
P-FAIL_S5V S5V, S9V, S12 and peripheral circuit on the Main Board
P-FAIL_15V 15V, 9V, 5V and peripheral circuit on the Main Board
P-FAIL_S1.2V S3.3V, S1.2V and peripheral circuit on the Main Board
P-FAIL_S-5V S-5V and peripheral circuit on the Main Board
P-FAIL_PJ PJ-Network Board and peripheral circuit on the Main Board
FAN_SPEED Failure of Fan, FN901, FN902, FN903, FN904, FN905 connected to the Power(DC) Board
Error information table
IC Pin Signal Name Connection Lines Error Information Failue Area
IC1801
61 P-FAIL_1.8V
3.3V_AD, 3.3VA_AD, 3.3VD_AD,
1.8VA_AD, 1.8VD_AD, 3.3VGA,
3.3VPNL, 3.3V, 2.5V, 1.0VGA,
MAIN, 1.8/1.2V
S6V3, S6V2 S6V1 line on
Main
62
P-FAIL_S-5V S-5V MAIN, S-5V S-5V line on Main, AV
63 P-FAIL_S1.2V
S3.3VFP, S1.2VFPGA,
S1.2VFP, S1.2VPA, S1.2VPD,
FPGA, S1.2V S3.3V, S6V3 line on Main
64 P-FAIL_15V
15V_PNL, 15V_LNS,
9V_LNS, 15.5VRE, 5V
MAIN, 15/9/5V
15V_PNL. 15V_LNS,
9V_LNS, 15.5V, 5V line on
Main
65 P-FAIL_S5V
5VPW, S5V, S5V_TEMP,
S9V_AUDIO, S5V_AUDIO
MAIN, S5/S9/S12
S5V_TEMP, S5V_AUDIO,
S5V, S9V_AUDIO, S5VPW
line on Main
66 P-FAIL_PJ
PJ-Network Board, AV
3.3V1, S5V_EXT
PJ_N/AV, 3.3/S5V
PJ-Network Board, 3.3V,
S5V line on AV, Joint
IC7201
103
I
108
FAN_SPEED5
(FAN_MTR5)
I
FAN_SPEED1
(FAN_MTR1)
FAN CONTROL
FAN1, FANLOCK
FAN2, FANLOCK
FAN3, FANLOCK
FAN4, FANLOCK
FAN5, FANLOCK
Fan Control on Power(DC)
FAN1 (FN901)
FAN2 (FN902)
FAN3 (FN903)
FAN4 (FN904)
FAN5 (FN905)
Power failure detection system
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