Gestetner B147 Service Manual page 210

SCANNER TEST MODE
Errors may be caused by the following problems:
1) Short circuit on the signal lines
• When the IPU board is installed, a pin or two on the ASIC is damaged.
• Some conductive matter or object is trapped among the pins.
• Condensation
2) Destruction of circuit elements
• Overcurrent or a defective element has broken the circuit.
3) Abnormal power supply
• The required voltage is not supplied to the devices.
4) Overheat/overcooling
• The board (the scanner unit) is in an inappropriate environment.
5) Static electricity
• Static electricity of a high voltage occurred during the test.
6) Others
• Error code 25 may be detected if the scanner and IPU are incorrectly
connected.
When you have conducted a check, turn the main switch off and on before
conducting another check. When you have conducted all necessary checks, turn
the main switch off and on.
B147/B149/B190 4-8 SM