Eiki LC-X71 LC-X71L service manual Power failure detection system, Error information table

Chassis Description

Power failure detection system

Detection of Power failure

The 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 "MAIN_6V_PF", "MAIN_-5V_PF", etc. are connected to the main power supplies. When the failure occurs, IC801<CPU> receives an error information through the power failure detection lines and turns off the signal "IC_RESET_CPU" output from pin 211 to stop the power supply.

The power failure detection signals are sent to IC4801<I/O expander> and then sent to IC801<CPU>.

Error information table

IC	Pin	Signal Name	Connection		Error Information
	64	PJ_5V_PF	PJNET S5V		PJNET,	S5V
	65	-5V_AV_PF	AV S-5V (AV BOARD)		AV,	-5V
	66	S5V_AV_PF	AV S5V (AV BOARD)		AV,	S5V
	67	MAIN_-5V_PF	SUB_POWER S-5V (MAIN)		MAIN,	S-5V
	68	M/A_PF	MOTOR&AUDIO 12V		M/A,	12V
	69	FAN_PF	FAN 16V		FAN,	16V
	70	SWF_1.2V_PF	SW FPGA 1.2V		SWFPGA,	1.2V
IC4801	71	SWF_2.5V_PF	SW FPGA	2.5V	SWFPGA,	2.5V
TIC81592GPBM	72	VDEC_1.8_PF	CXD3807	1.8V	ANALOG,	1.8V
	73	FPGA_1.5V_PF	FPGA 1.5V		FPGA,	1.5V
	74	GAM_15.5V_PF	GAMMA 15.5V		GAMMA,	15.5V
	77	MAIN_6V_PF	SUB POWER 6V (MAIN)		MAIN,	6V
	78	MAIN_3.3V_PF	SUB_POWER 3.3V (MAIN)		MAIN,	3.3V
	80	AD_3.3V_PF	AD9882 3.3V		ANALOG,	3.3V
	82	AD_5V_PF	AD9882 5V		ANALOG,	5V
	83	GAM_1.8V_PF	GAMMA 1.8V		GAMMA,	1.8V
	56	LAMP_FAN_PF	LAMP_IN_FAN 16V		LAMP FAN, 16V

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