Test D - Nvr - Nonvolatile Ram; Additional Nvr Information; Test C - Dz - Serial Line Controller - Digital Equipment VAXstation 3100 Maintenance Manual

24 Troubleshooting
2.5 TEST D - NVR - Nonvolatile RAM
The nonvolatile RAM
(NVR)
contains specified data that must not
be
lost
when the system is powered down. It stores boot device information, boot
flag information, the keyboard language, the time and date, the charge status
of the battery, and other information. Since tbe battery charge may be low
before the initial installation of the system, the NVR may show a soft error
code of 0000.0005 indicating that the battery needs to be recharged.
Self-test is used to troubleshoot the NVR circuits. The system exerciser does
not test the NVR circuits. Enter TEST D to run self-test.
A code of 0000.0001 next to the NVR mnemonic indicates no errors detected
with the NVR circuits. Replace the system module if any other code is listed
(except 0000.0005 as previously described).
2.5.1 Additional NVR Information
The NVR circuits are located on the system module. Therefore, any error code
for the NVR, except the low battery charge code (0000.0005 - low battery)
indicates ·that-the system -module must-be
r~plaGed.
If- the -low-battery chru:ge
code does not clear
within
1 hour of constant power-on operation, check the
battery cable connection. Then replace the battery and allow
it
to charge for
a 24-hour period.
Appendix E contains th- e power.:up and-s-elf;;test-error-codes- . - - -
2.6 TEST C - 0£ - Serial Line Controiler
The serial line controller (DZ) controls the four serial lines on the system
module. Table 2-2 lists the four serial lines and the port mnemonic for VMS
and ULTRIX: operating systems.
Rwi self-test and the system exerciser to troubleshoot the DZ circuits. Enter
TEST C to run self-test. Then enter TEST 50 to see the results, or enter
TEST 80000106 and C to run the Field Service system exerciser on just the
DZ.
A code of 0000.0001 next to the DZ mnemonic indicates no errors detected
with the serial line controller circuits. Replace the system module if any other
code is listed.