Oki Microline 3320 Maintenance Manual page 123

10-2 (RS232C I/F)
Is the correct cable used?
Yes No
Change I/F cable.
Is ALARM LED blinking?
No Yes
See tables 6.2 and 6.3 for the troubleshooting.
Make sure of the parameters for RS232C in the menu are correct.
Baud rate
Bit length
Parity
Protocol
Busy signal and its polarity
Remedied?
No Yes
End
Is + 8V supplied on Driver board?
Yes No
Remove RS232C I/F Board.
Is the + 8V supplied on the Driver board?
No Yes
Replace RS232C I/F board.
Replace Driver board.
Printer I/F pin assignment.
TXD 2 pin,
RXD 3 pin,
SSD 11 pin,
DTR 20 pin,
DSR 6 pin.
20
••••••••••••••••••••
+8V (pin20)
6 – 20
Driver Board
CN2 1
0V (pin10)