Section II. Troubleshooting Procedures

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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