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Ta .... 8-1. R . . . . d Tool.
(ContInued)
P . . Numb.,
Description
HP 82916A/25A/27 A
Memory module (1M byte/256K byte/512K
byte), only one needed.
HP 82919A
Serial interface
82919-60903
Serial test connector
HP 82998A
HP-IB interface
HP 82977A/B
HP-IB cable
00095-60902
I/O port extender
HP 3469B·
Multimeter, or equivalent
Oscilloscope
Logic probe
Frequency counter (preferably six significant
digits)
Soldering iron
Oesoldering tool
• The HP 500SA Signature Multimeter
is
recommended. You can use this instrument
in
place of the multimeter. logic
probe.
and
frequency
counter listed above.
8.5 Main Diagnostic Procedure
To check out a unit prior to repair, follow the problem analysis steps
in
section 8.5.1, then do the turn-
on self tests (section 8.5.2), the service ROM tests (section 8.5.3), and the service diagnostic disc tests
(section 8.5.4). Once you have identified the problem, repair the computer using the repair procedures
in
section 8.6, then verify the repair by repeating the appropriate tests. (For a good unit, you'll proceed
through the entire main sequence without branching to any of the repair procedures.)
Once you have repaired the computer and verified the repair, perform a complete functional verification of
the computer following the procedure in section 8.5.5.
CAUTION
Whenever you open up the computer, wear a grounded wrist strap and work at a bench that is
electrostatically protected. Refer to 'ESD Considerations' in chapter 6. Many components are
highly susceptible to damage by electrostatic discharge.
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