Eiki LC-X71 LC-X71L Diagnosis of power failure with RS-232C port, Diagnosis procedure

Chassis Description

Diagnosis of power failure with RS-232C port

This projector provides a function to get the error information of the projector by using the RS-232C serial port for the power failure diagnosis.

The further error information of the power failure and fan failure can be found out by using this function.

Diagnosis procedure

1Connect a RS-232C serial cross cable to SERIAL PORT IN on the projector and serial port on the PC.

2Launch a communication software "Hyper terminal" provided with PC and setup the communication condition as follows;

Baud rate	: 19200 bps
Parity check	: none
Stop bit	: 1
Flow control	: none
Data bit	: 8

3Turn on the projector. Check that the LED shows a power failure. (All the LEDs except LAMP LED are blinking)

4Type a diagnosis command of the power failure "CR ALLP- FAIL" and press a "ENTER" key within 1 second on the command window of the software.

The error information will be listed on the window as the right.

Check the status column. If "NG" is listed, the power failure occurs on its signal line (Power Line Name).

In case of the right table, this error information means that the power failure occurs on the S-5V power supply on the analog circuit on the main board. Check if the parts con- nected to S-5V power supply line are defective.

Also the error information may be listed multiple as the below;

In the above case, 2 kinds of causes are considered.

One is the power failure occurs on the multiple places at the same time, other is a power failure affects multiple power supply lines even if the failure occurs on the single place.

In the former case, check if the parts connected to the mul- tiple power supply lines are defective. In the latter case, determine a failure point referring to "Power failure detec- tion tree" on the previous page. Basically, if the power fail- ure occurs on the upper side of power supply, the power failure is also detected on lower side of power supply fre- quently. If the failure occurs on the lower side of power sup- ply, it is lightly affected to the upper side of the power sup- ply. In the above case, because the failure occurs on the 6V power supply on the analog circuit on the main board, the failure is also detected on the 3.3V and 5V power supply on the ANALOG circuit on the main board.

Error Information		Status		Error
(Signal name)
CR	ALLPFAIL
000	PJNET,	S5V	OK
000	AV,	-5V	OK
000	AV,	S5V	OK
000	MAIN,	S-5V	NG
000	M/A,	12V	OK
000	FAN,	16V	OK
000	SWFPGA,	1.2V	OK
---	---	---	--

---	---	---	--
000	ANALOG,	1.8V	OK
000	FPGA,	1.5V	OK
000	GAMMA,	15.5V	OK
000	MAIN,	6V	NG
000	MAIN,	3.3V	OK
000	ANALOG,	3.3V	NG
000	ANALOG,	5V	NG
000	GAMMA,	1.8V	OK
---	---	---	--

Error

* See "Power Failure Detection Tree" for further description of the Error Information.

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