4-16 Troubleshooting
No comm link error
A “No Comm Link” error indicates that the front panel processor has stopped communicating
with the main processor, which is located on the motherboard. This error indicates that one of
the main processor ROMs may require re-seating in its socket. ROMs may be reseated as
follows:
1. Turn off the power, and disconnect the line cord and all other test leads and cables from
the instrument.
2. Remove the case cover as outlined in Section 5.
3. Locate the two firmware ROMs, U102 and U103, located on the motherboard. These are
the only ICs installed in sockets. (Refer to the component layout drawing at the end of
Section 6 for exact locations.)
4. Carefully push down on each ROM IC to make sure it is properly seated in its socket.
CAUTION Be careful not to push down excessively, or you might crack the
motherboard.
5. Connect the line cord, and turn on the power. If the problem persists, additional
troubleshooting will be required.
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