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4
Description of
Self Test
Results
,*"",,,(.)
Troubleshooting
The MUX has an on-board self test to verify operation of the card. This
chapter explains how to initiate self test and how to interpret the results.
The HP 27140A card has a self-test program stored in the EPROM chip
mounted on the board. The program executes each time the card is
RESET, or on command from the operator. The test operates on a
GOINO-GO basis and determines whether the card
will reliably pass data
in both directions.
There are, in fact, two self tests. The fIrSt, without the optional test hood,
verifies the on-board circuitry of the EPROM itself, the RAM, operation
of the Z-SO microprocessor, and resident DMA and timer chip operation.
The test hood allows further testing of the Z-SO Serial Communications
Controller (SCC) circuits, the line drivers and receivers. (See "Options
and Additional Equipment" in Chapter 1 for test hood part number.)
The normal method of receiving the results of the self test is through the
system console. In some cases, however, this may
be
impossible due to
hardware or software failure in the system console circuit.
Never attempt to defeat an interlock system. It is there to protect you
from shock and the computer from damage. (Please note that HP
engineers have special tools which allow them to by-pass an interlock
safely.)
Troubleshooting 4-1
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