Slow Or Missing Clock; Slow Clock - HP 10314D User Manual

"Slow or Missing
HP 16540/16541A,D State:
Clock"
The HP 16540/16541A,D Master Card is not receiving any clocks.
• Ensure that the target system is On.
• Ensure that connector Pod 1 of the HP 10269C is connected to
pod 1 of the Master Card.
HP 165118 State:
The HP 16511B expander card is not receiving state clocks. Ensure
that the pod 2 cable from the expander (lower) HP 16511B card is
connected to the HP 10269C Pod 2.
HP 1650A,8, HP 16510A,B, or HP 16528 State:
The logic analyzer is not receiving state clocks.
• Ensure that the pod 2 cable from the logic analyzer is connected
to the HP 10269C Pod 2.
• Ensure that your target system is running properly.
• For HP 1650A and HP 16510A Logic Analyzers, check the
preprocessor interface power fuse in the logic analyzer.
Slow Clock
If you have the preprocessor interface hooked up and running and
observe a slow clock or no activity from the interface board, the
+
5 V
supply coming from the analyzer may not be getting to the interface
board.
Troubleshooting
A-2
To check the
+
5 V supply coming from the analyzer, disconnect one of
the logic analyzer cables from the HP 10269C and measure across pins
1 and 2 or pins 39 and 40 (see figure A-1, next page).
• If
+
5 V isn't observed across these pins, check the internal
preprocessor fuse or current limiting circuit on the logic analyzer.
For information on checking this fuse or circuit, refer to the
service manual for your logic analyzer.
• If
+
5
V
is
observed across these pins and you feel confident that
the
+
5 V is getting to the preprocessor interface, contact your
nearest Hewlett-Packard Sales/Service Office for information on
servicing the board.
HP 103140
80386DX Preprocessor Interface