Output Amplitude Adjustment Setup - HP 5334B Service Manual

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
( Y l ) .
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