Oki OKIPAGE 10ex Maintenance Manual page 245

B-14 Print overrun occurs frequently.
• Is an option board mounted?
• No
B-15 Error host I/F occurs frequently.
• Remove the option PCB (RS-232C). Has the Problem been solved?
• No
B-16 Error receive buffer overflow occurs frequently.
[Centronics I/F]
• Is the BUSY signal being sent to Pin 11 (BUSY-P) of the connector (CENT)?
• Yes
[Serial I/F]
• Is the DTR signal being sent to Pin 4 (DTR) of the connector (CN2 on the RS-232C
option PCB)?
• Yes
40990901TH Rev.1
• Yes Go to the flowchart B-6.
Set DRAM SIMM Memory Module on an option board, then mount it to the
printer.
• Has the problem been solved?
• Yes Print Data is too complex to print out, so it is necessary to
mount an option board with DRAM (SIMM Memory Module)
to the printer.
• No Go to the flowchart B-6.
• Yes Failure of option PCB. Go to flowchart of each option PCB
Failure of IC1 (MHM2029-004K)
• No Is the BUSY signal being sent to Pin 3 (BUSY-P) of IC11 (7407)?
• Yes Replace IC11 (7407).
• No Failure of IC1 (MHM2029-004K).
Verify the host settings.
• No Is the DTR signal being set to Pin 9 (DTR-N) of Q111 (75188 on the
RS-232C option PCB)?
• Yes Replace Q11 (75188 on the RS-232C option PCB).
• No Failure of IC1 (MHM2029-004K).
Verify the operation of the host.
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