Olivetti ECR 7900 Service Manual page 53

Trouble shooting
- Scanner head lamp does not light up when power ON.
Check the voltage (AC +5.0V) at point (1).
If it outputs properly - - - Replace the Harness ass'y.
If it doesn't output properly - - - Replace the Main board.
- Scanner head lamp lights up but the scanner does not read a barcode.
- - - Replace the Harness. If the condition is not changed, replace the Main board.
- Cannot work the USB port - - - Replace USB I/F Board.
- Cannot write or read the data for SD card
Check the voltage (DC +3.0V) at point (2).
If it outputs properly - - - Replace Main board or SD card unit.
If it doesn't output properly - - - Replace Main board.
Y108540-8 ECR 7900 Service Manual 47