Diagnosis Of Power Failure With Rs-3C Port; Diagnosis Procedure - Sanyo PLC-XT25 Service Manual

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-3C 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

1
Connect a RS-3C serial cross cable to SERIAL PORT IN on the projector and serial port on the PC.
2
L aunch a communication software "Hyper terminal" provided with PC and setup the communication condition as
follows;
Baud rate
Parity check
Stop bit
Flow control
Data bit
3
T urn on the projector. Check that the LED shows a power
failure. (All the LEDs except LAMP LED are blinking)
4
T ype a diagnosis command of the power failure "CR
ALLPFAIL" 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 fail-
ure 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 S1.V power supply on the
FPGA circuit on the main board. Check if the parts con-
nected to 6V power supply line are defective.
Also the error information may be listed multiple as the
below;
In the above case,  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 mul-
tiple power supply lines even if the failure occurs on the
single place.
In the first case, Check if the parts connected to the mul-
tiple power supply lines are defective. In the later case,
determine a failure point referring to the power supply
flow chart on 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 frequently. If the failure occurs on the lower side of power
supply, it is lightly affected to the upper side of the power supply. In the above case, because the failure occurs on
the S6V power supply on the MAIN circuit on the main board, the failure is also detected on the 5V power supply
and S5V power supply on the main board.
* See "Power Failure Detection Tree" for further description of the Error Information.
: 1900 bps
: none
: 1
: none
: 8
-93-
CR ALLPFAIL
000 MAIN, 1.8/1.2V
000 MAIN, S-5V
000 FPGA, S1.2V
000 MAIN, 15/9/5V
000 MAIN,S5/S9/S12V
000 PJ_N/AV,3.3/S5V
000 FAN, FANLOCK
........ ............... ......... ......
CR ALLPFAIL
000 MAIN, 1.8/1.2V
000 MAIN, S-5V
000 FPGA, S1.2V
000 MAIN, 15/9/5V
000 MAIN,S5/S9/S12V
000 PJ_N/AV,3.3/S5V
000 FAN, FANLOCK
........ ............... ......... ......
Error Information
(Signal Name)
OK
Status
OK
NG
Error
OK
OK
OK
OK
OK
OK
OK
NG
Error
NG
OK
OK