Additional Dz Information; Dz Codes In The Configuration Table - Digital Equipment VAXstation 3100 Maintenance Manual

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Troubleshooting 25
2.6.1 Addltlonal DZ Information
Loopback connectors must be installed in the printer port and communication
port to test the DZ in Field Service mode. They are not needed dwing customer
mode testing because the DZ uses internal loopback switches for transmission
testing.
During
Field Service mode testing, the serial line drivers are fully tested.
Characters are sent out to two of the four serial lines (communication and
printer ports). They are verified as they are looped back into the port's receiver.
If a loopback connector is not installed or the wrong character is received, an
error code is listed in the DZ code for that port.
The DZ circuits are on the system module. Therefore, if an error code for
the DZ other than 0000.0001 is indicated, replace the system module. While
in Field Service mode, check the loopbacks for proper installation before
replacing the system module. If the loopback is not installed on the printer
port, a bard error (0000.0200) is listed for that port on the DZ circuits.
Appendix E contains the power-up and self-test error codes and Appendix
F contains the system exerciser error codes.
In the configuration table (TEST 50), the DZ contains six additional status
codes as shown in Figure
2-2.
The first four codes
are
for the serial lines,
then the keyboard, and last is th. e mouse or tablet code. Any code other
than
the codes shown in Figure
2-2
indicates a
failure on that line (except the
mouse or keyboard may be unplugged, which will indicate 00000000).
DZ 0000.0001
00000001 00000001 00000001 00000001 00000001 000012AO
L.
~ou11e
or Tablet
11elf-te11t
Keyboard 11elf-te11t
Printer port 11tatu11
communication port 11tatu11
Video port status
Keyboard port 11tatu11
Figure 2-2 DZ Codes In the Configuration Table