-90-
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, 1.2V and peripheral circuit on the Main Board
P_FAIL_S5V S5V, S12V, S9V and peripheral circuit on the Main Board
P_FAIL_15V 15V, 5V and peripheral circuit on the Main Board
P_FAIL_S1.2V 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 1.8V, 1,2V MAIN, 1.2/1.8V
3.3V, 1.2V, 1.8V line on
Main
62
P_FAIL_S-5V S-5V MAIN, S-5V S-5V line on Main, AV
63 P_FAIL_S1.2V
S3.3V/FPGA, S2.5V/FPGA/
S1.2V
FPGA, S1.2V
S3.3V, S2.5V, S1.2V line on
Main
64 P_FAIL_15V 15V, 5V MAIN, 15/9/5V
15V_PNL. 15V_LNS,
9V_LNS, 5V line on Main
65 P_FAIL_S5V S5V, S12V, S9V MAIN, SS5/S9/S12
S5V_TEMP, S5V_AUDIO,
S5V, S9V_AUDIO, S12V,
S5V_PW line on Main
66 P_FAIL_PJ PJ-Network Board, AV 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 FAN, FANLOCK Fan Control on Power(DC)
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General
Weight and Dimensions
