Troubleshooting CMU
1100.4903.82 3.54 E-4
Troubleshooting
Faulty functions may sometimes originate in simple causes, but sometimes they also result from faulty
components.
These troubleshooting instructions permit to trace the fault down to module level and make the
instrument ready for use again by means of module adjustment.
For the module adjustment and further error elimination, we recommend to send the instrument to our
authorized service (see list of addresses, preface).
Warning!
Live modules must not be removed or plugged in!
Do not produce short-circuits when measuring voltages!
For simple troubleshooting, the CMU provides the following tools:
• Nine green LEDs (H1 to H8) at the bottom of MOTHERBOARD1, which indicate the operating
voltages.
• A SELFTEST and INFO menu, which presents voltages via the module-internal diagnosis and RF
loop-measurements with internal RF generator and RF analyzer.
• ERROR messages on the LCD display with references to sources of error.
Note: In the case of problems first check all connections for damage (cables, plug-and-socket
connections etc.) or wrong positions.
For advanced troubleshooting on board-level, see Service Manual Modules (1100.4903.94-01).
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