Slow Clock - HP E2418A User Manual

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 corning 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 E2418A and measure across pins
1and2 or pins 39 and 40 (see figure A-1).
• 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.
(+5V)
2 ( GND)
C+SV)
Figure A-1. Pinout of the Logic Analyzer Cable
HP E2418A
TMS32020/C25 Preprocessor Interface