AT&T PC 6300 - Page 471

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13. Record the error message and turn the power switch OFF.
14. Using the recorded error message and the table shown in
Figure 5-31, determine the module that generated the failure
and replace that module.
ERROR NO.
PROBABLE CAUSE
MODULE
701 Data Path to 8250 Failed
Motherboard
702
Transmit/Receive Failed
Using 8250 Internal
Loopback Mode
Motherboard
703
Transmit/Receive Failed
Using Loopback Jumper
Motherboard
704
8250 Interrupt Circuit Failed
Motherboard
705 Control Lines are not
Correct on the Loopback
Jumper
See Note.
Note: Refer to Chapter 4, "DIAGNOSTICS," and verify that the
Serial Loopback Jumper is wired properly. If the Jumper
is wired properly, replace the Motherboard.
Figure 5-31. Serial Port Troubleshooting Chart
5-93