IBM 6400 series Maintenance Manual page 79

for Data Protocol, Baud Rate, Data Bits, Stop Bits, Parity, Data Terminal Ready,
and Request to Send.
Set printer serial interface parameters to match those of the host.
2. Send a print job to the printer.
If the message appears, go to Communications Failures, page 133.
026 HEX DUMP MODE
1. Printer attach status message.
No action required.
027 COMMUNICATIONS CHECK
CALL SYSTEM OPERATOR
1. Enable poll timeout. The printer was not enabled for one minute over a coax
interface. Power off the printer. Disconnect the AC power cord from the printer.
Check data cable connection and host system. (Refer to line problem
determination procedures, as recommended by the host system.)
028 COMMUNICATIONS CHECK
CALL SYSTEM OPERATOR
1. Poll timeout error. The printer was not polled for one minute over a coax
interface. Power off the printer. Disconnect the AC power cord from the printer.
Check data cable connection and host system. (Refer to line problem
determination procedures, as recommended by the host system.)
029 8344 DIAGNOSTIC TEST FAILED
1. Link-level code test detects a hardware failure on the coax/twinax expansion
board. This message can also occur if the software in flash memory is corrupted.
Cycle power. Run the print job again. If the message appears, download
the emulation software again.
2. Cycle power. Run the print job again.
If the message appears, replace the coax/twinax expansion board.
Record the message and return it with defective board.
031 END OF FORMS TIMEOUT
LOAD FORMS
1. On a coax interface, a timeout message is sent to the host if paper is not loaded
within 10 minutes after Stop was pressed to clear an end of forms fault.
Troubleshooting 79