Troubleshooting; The Power Is Not Turned On - GRAPHTEC FCX2000 Service Manual

10 TROUBLESHOOTING

10.1 The power is not turned on.

Symptom
Nothing is displayed on the LCD.
The USER LED is not lighting.
The power switch can not turn on. The Emergency switch was
Nothing is displayed on the LCD. The LCD is defective.
"Sum-Ck ROM RAM ERR!!" is
displayed on the LCD panel.
FCX2000-UM-251-9370
Possible Cause
There is no power supplied.
pressed.
Or the control panel cable is
broken.
Or there is bad contact on
connector of LCD.
Or main board is defective.
The main board is defective.
10-1
10 TROUBLESHOOTING
Solution
Confirm the power cable is
connecting to the inlet of main unit
securely.
Confirm the power cable is
connecting to AC inlet securely.
Confirm the power supply board is
outputting +40 V on CN2.
Replace the power supply board if
it does not output +40 V.
Release the Emergency switch.
Replace the LCD if the PAUSE/
MENU of LED is lit when the
PAUSE/MENU key was pressed.
Confirm the control panel cable is
not broken if the PAUSE/MENU
of LED is not lit when the PAUSE/
MENU key was pressed.
Confirm the pin No. 21 to No.23
are not broken or bad contact.
When the pin No. 21 to No.23
of signal line are broken or bad
contact, replace the control panel
cable.
Replace the main board when the
LCD and the control panel cable
are not defective.
Replace the main board.