Keithley SourceMeter 2400, Руководство по обслуживанию, Страница: 67 / 137

4-13 Model 2400 Service Manual
Troubleshooting
2400-902-01 (G - Feb 2006)
Re-assemble the instrument and turn it on. The “Reading buffer data lost” error message will
be displayed. Send the :syst:mem:init command to perform the following:
• Clear the reading buffer.
• Initialize instrument setups 1-4 to the present instrument settings.
• Initialize all 100 source memory locations to the present instrument settings.
• Delete user math expressions.
No comm link error
A “No Comm Link” error indicates that the front panel processor has ceased communication
with the main processor, which is located on the digital board. 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. Remove the analog shield and analog board assembly as outlined in Section 5.
4. Locate the two firmware ROMs, U15 and U16, located on the digital board. These are
the only ICs installed in sockets. (Refer to the component layout drawing at the end of
Section 6 for exact locations.)
5. 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 digital
board.
6. Connect the line cord and turn on the power. If the problem persists, additional trouble-
shooting will be required.