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MAINTENANCE
I~I~HI'
If
the MUX card did not pass the self -test described in Section II, it is recommended that you return
the card to Hewlett-Packard.
If
further testing is desired, however, a diagnostic test hood, which tests
slightly more or the card's circuitry, can be ordered. The diagnostic test hood part number is
0950-1659.
To test the MUX card using the diagnostic test hood, perform the following:
1. Turn computer system power off.
2. Connect the test hood to connector J2 on the card.
3. Refer to the appropriate computer system manual to determine if the self-test is run automati-
cally at power-on, or only when specifically invoked by you.
4. Turn on computer system power.
5. When the self -test executes, the LED located on the test· hood and the LED located on the
MUX card both should light briefly and go out if the card passed self -test.
If
the LEDs do not
light at all, the card is defective.
If
the LEOs stay lit, the card did not pass self -test.
If
desired, isolation to a defective part may be performed. Please be advised, however, that such
work is at your discretion and is your responsibility; moreover, NOTE THAT CUSTOMER REP AIR
OR MODIFICATION OF THE MUX CARD WILL INVALIDATE WARRANTY AND RENDER
THE
CARD
INELIGIBLE
FOR
EXCHANGE
OR
REPAIR
BY
HEWLETT-PACKARD
COMPANY.
If
such service is performed, the replaceable parts information in Section VI and the
schematic logic diagrams in Section VII will be of assistance.
5-1
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