Diagnosis Of Power Failure With Rs-232C Port - Sanyo PLC-WM4500L Service Manual

Troubleshooting

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
1
Connect a RS-232C serial cross cable to CONTROL PORT on the projector and serial port on the PC.
2
Launch 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
Turn on the projector. Check that the LED shows a
power failure. (All the LEDs except LAMP LED are
blinking)
4
Type 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
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 6V power supply
circuit on the main board . Check if the parts connected
to 6V 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 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
multiple 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 failure 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 6V power supply on the main board (PF_MAIN), the failure is also detected on the 5V power supply
on the main board (MAIN, 5V).
* See "Power Failure Detection System" for further description of the Error Information.
: 9600 / 19200 bps
: none
: 1
: none
: 8
-83-
CR ALLPFAIL
000 PF_IC_S3.3V,
000 PF_LNS,
000 PF_MAIN,
000 PF_12V_ID,
000 AV, S-6V
000 FAN,
000 MAIN, 5V
........ ............... .........
CR ALLPFAIL
000 PF_IC_S3.3V,
000 PF_LNS,
000 PF_MAIN,
000 PF_12V_ID,
000 AV, S-6V
000 FAN,
000 MAIN, 5V
........ ............... .........
Error Information
(Signal Name)
OK
Status
OK
OK
OK
OK
OK
NG
Error
......
OK
OK
NG
Error
OK
OK
OK
NG
......