Service manual

3. DIAGNOSTIC CHECK
3.44 Service Manual BSM-4100
SERIAL I/F Check
This item checks the communication interface for external equipment such as a
personal computer.
To perform this check without a personal computer, you must make the following
short circuits at the AUX socket.
Pins 2 and 27
Pins 3 and 28
Pins 4 and 29
Procedure to Start the SERIAL I/F Check Program
To select the SERIAL I/F Check, touch the “SERIAL I/F CHECK” key at the COM
CHECK column. The check program automatically starts.
The check program changes the baud rate, data bit length and parity check
condition to check the serial communication interface.
If an error message appears, the MAIN board will be faulty.