TM 11-6625-3060-10
Section II. Troubleshooting Procedures
TROUBLESHOOTING
Introduction
1. The table lists the common malfunctioning which you may find during the operation or maintenance of the ME-
526A/USM. You should perform the tests/inspections and corrective actions in the order given.
2. This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If a
malfunction is not listed or is not corrected by listed corrective action, notify your supervisor.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. NO DISPLAY INDICATION, NO DBM METER MOVEMENT
WHEN OFF-MV SWITCH PLACED IN MV POSITION.
Step 1.
Check for ac power.
Verify ac power present
Step 2.
Check fuse.
Verify fuse not open.
2. CANNOT ZERO DISPLAY AND DBM METER WITH
ZERO CONTROL.
Step 1. Check that FULL SCALE 1 mV pushbutton
switch is depressed.
Verify I m V pushbutton Is depressed.
Step 2. Check front panel PROBE connector for
proper connection of RF PROBE.
Verify PROBE connector is secure.
Step 3. Check that there is no rf input and the 50-
OHM ADAPTER is attached to the RF
PROBE.
Verify input removed. Attach 50-OHM ADAPTER.
3. INDICATOR DISPLAY IS KNOWN TO BE INCORRECT.
Step 1. Check connection made to signal under test.
CAUTION
When the RF PROBE must be replaced send the ME-
526A/USM to higher level maintenance. The ME-
526A/USM must be calibrated with the RF PROBE
with which it is used.
Step 2.
Check RF PROBE tip (if used) for
proper connection to RF PROBE.
Verify RF PROBE tip makes connection to RF PROBE.
Replace tip if faulty. If RF PROBE is faulty, higher level
maintenance required.
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