specifications. If the unit
has
had sufficient time to stabiie but
is
still out of specification, the most likely cause
of excessive
drii
is
a active crystal
(Yl).
If
Y1
is to
be
replaced, read paragraph 8-384(b). Other possible causes
are
an
unstable
C3
andlor C8:
HP1715A OR
EQUIVALENT
OSCILLOSCOPE
K)**-L2
Figure
8-11.
Output Amplitude Adjustment Setup
8-431.
HP-IB BLOCK TROUBLESHOOTING
8-432. There are two Failure Messages from
Table
3-4,
in the Operating and Programming Manual, to help
troubleshoot the HP-IB Block. Failure code
9.2
indicates that the HP-IB MCU is not responding and 9.4 warns
of a communications failure between the Executive and HP-IB microcomputers.
8-433. To troubleshoot this block, first check all supply voltages, and also the
TTL clock signal at pin
2
of
MCU U17.
8-434.
The HP-IB Operation Verification Test in Section IV of this manual can be used to verify proper opera-
tion of the HP-IB Block. Refer to Section IV, paragraph 4-41, for details.
8-435. If the HP-IB Verification Test
will
not run, use the HP-IB test setup from Section IV and the following
instructions to help troubleshoot a failure.
8-436. Check to see
if
the REMOTE ENABLE and INTERFACE CLEAR latches are setting and clearing
properly.
a. When the REN (REMOTE ENABLE) line of the HP-IB bus goes HIGH
(U10 pin 11), the REN
latch goes LOW (U8 pin 11) and the HP-IB MCU tries to clear the latch.
HP
5334B
-
Service Manual
8-67
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