Ricoh B230 Service Manual page 248

Errors may be caused by the following problems:
1. Short circuit on the signal lines
When the BICU 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
Over current or a defective element breaks the circuit.
3. Abnormal power supply
•The required voltage is not supplied to the devices.
4. Overheat/overcooling
The environment is inappropriate for the board (the scanner unit).
5. Static electricity
Static electricity of a high voltage occurs during the test.
6. Others
The scanner and BICU are incorrectly connected.
When you have completed a check, turn the main switch off and on before you do another
check. When you have completed all necessary checks, turn the main switch off and on.
B230/B237 4-8 SM