CMU Troubleshooting
1100.4903.82 3.59 E-4
• Example: Info menu REFERENCE BOARD
Fault: The frequency accuracy of the RF signal deviates.
Call the Maintenance Menu via the INFO Key select REFERENCE BOARD, start the diagnosis
measurement using the TEST Key and activate the ON hardkey.
All diagnostic voltages
within permissible
limits (deviations
marked red)?
Yes
Connect ext.
reference source with
correct frequency!
Ext. reference source
selected, but not
connected to REFIN?
Int. reference element TCXO or
OCXO, if present, incorrectly
adjusted, faulty or REFERENCE
BOARD faulty!
No
No
Int. reference element TXCO or
OCXO, if present, incorrectly
adjusted or faulty!
Ext. reference element
connected, but wrong
frequency selected!
External reference
source selected?
No
Yes
Yes
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