Service manual
Testing 5
Any code in the configuration table other than 0000.0001 on the MONO,
DZ, FP, IT, or SYS devices indicates a hard error and the system module
must be replaced for proper operation of the system. The other devices
such as CLK, NVR, MEM, SCSI-A, SCSI-B, and NI may have a code other
than (0000.0001) and may still operate normally.
1.2 Running a Self-Test
Self-test allows you to test every device again after the power-up tests are
complete. Devices can be tested individually (except for drives), a few at a
time, or all of them sequentially just like power-up tests.
To individually test a device (drives are tested all together on their
particular bus), enter the word (TEST) or just the letter (T), followed by
a space and the test number of the device you want tested. Table 1–1
lists the devices and the test numbers that test the devices. Example 1–4
shows an example of running a self-test on a SCSI bus. All devices
connected to the SCSI bus are tested and the results are listed in the
configuration table (T 50).
>>> TEST 6
6...
>>>
NOTE: Enter TEST 50 to see the results
Example 1–4 Running a Self-Test on a SCSI Bus
1.2.1 Self-Test with Loopback Connectors
A customer mode self-test (that is, without any serial line loopbacks)
does not test the drivers on the serial lines (DZ). To test the DZ drivers,
run a self-test on the serial lines in customer service mode by installing
loopbacks on the two MMJ connectors, then run TEST C. Display the
configuration table to see the results.
If only one MMJ loopback is available, install it in the communications
port and run the tests. An error code of 0000.0200 on the fourth line
for the DZ indicates that the printer port does not have the loopback
installed, but the communications port tested successfully.