LC-90LE740X
6 – 3
3. New method
LED flashing timing chart at the time of an error
1) Inverter/Lamp failure details (Flashes slowly once and flashes fast) Note
2) Power failure details (Flashes slowly twice and flashes fast) Note
3) Communication failure details (Flashes slowly 3 times and flashes fast) Note
Error type Center icon LED operation
Pins are monitor microprocessor pins unless other-
wise specified.
Lamp failure
Flashes fast once
H: On
L: Off
ERR_PNL: failure (H). Inverter / Lamp error is detected.
Note that after five detection counts, the lamp cannot be
activated except in the adjustment process mode.
Accumulated counts are cleared to 0 by the setting in the
LAMP ERROR RESET on the adjustment process mode.
Error type Center icon LED operation
Pins are monitor microprocessor pins unless other-
wise specified.
PS_ON
AC_DET failure
Flashes fast once
H: On
L: Off
AC_DET failure (L).
SM_POW
Main 13V failure
Flashes fast twice
H: On
L: Off
DET_13V failure (L). Main 13V is not applied.
D_POW
Digital 3.3V failure
Flashes fast 3 times
H: On
L: Off
DET_D3V3 failure (L). Digital 3.3V is not applied.
PANEL_POW
Panel 12V failure
Flashes fast 5 times
H: On
L: Off
DET_PNL12V failure (L). Panel power is not applied.
Error type Center icon LED operation
Basically, debug print logs are analyzed or commu-
nication logs are analyzed by a bus monitor.
Initial communica-
tion reception failure
Flashes fast once
H: On
L: Off
Initial communication from the main CPU is not
received. (Request for the monitor model No. is not
received.)
→ Communication line failure or main CPU start-up fail-
ure
Start-up confirma-
tion reception failure
Flashes fast twice
H: On
L: Off
Start-up reason confirmation from the main CPU cannot
be received. (Start-up communication until start-up rea-
son notification command is not received.)
→ Main CPU start-up failure or monitor microprocessor
reception failure
Regular communica-
tion failure
Flashes fast 3 times
H: On
L: Off
Regular communication that is performed at 1 second
intervals in the normal operation is interrupted.
→ Main CPU operation failure or monitor microproces-
sor reception failure
Other communica-
tion failure
Flashes fast 5 times
H: On
L: Off
When a request (PM_REQ=H) is sent from the main
microprocessor, the request command is not output
from the main CPU, etc.
→ Main CPU operation failure or monitor microproces-
sor reception failure
100ms 400ms 1.6sec
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