Oki ML421 Maintenance Manual - Page 113

Are +12V and -8V supplied on Control Board?

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Oki Data CONFIDENTIAL 10-2 (RS232C I/F) Printer I/F pin assignment. Is the correct cable used? Yes No Change I/F cable. TXD RXD SSD DTR DSR 2 pin, 3 pin, 11 pin, 20 pin, 6 pin. 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 Control Board End Are +12V and -8V supplied on Control Board? Yes No Remove RS232C I/F Board. +12V (pin3) 20 CN2 1 0V (pin8) -8V (pin1) Are the +12V and -8V supplied on the Control Board? No Yes Replace RS232C I/F board. Replace Control Board. Replace RS232C I/F board. Remedied? No Yes End Replace Control Board. 42113901 Rev.2 113 /

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42113901
Rev.2
113 /
Oki
Data
CONFIDENTIAL
10-2 (RS232C I/F)
Printer I/F pin assignment.
Is the correct cable used?
TXD
2
pin,
RXD
3
pin,
Yes
No
SSD
11
pin,
DTR
20
pin,
Change I/F cable.
DSR
6
pin.
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
Are +12V and -8V supplied on Control Board?
Yes
No
Remove RS232C I/F Board.
Are the +12V and -8V supplied on the Control Board?
No
Yes
Replace RS232C I/F board.
Replace Control Board.
Replace RS232C I/F board.
Remedied?
No
Yes
End
Replace Control Board.
Control Board
20
0V (pin8)
-8V (pin1)
+12V (pin3)
CN2
1