TROUBLESHOOTING-continued

TM 11-6625-291-14/TO 33A1-7-23-1

TROUBLESHOOTING (CONT)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

2. Meter indication only when impedance control is set at 300 ohms or below (at 1,000 ohms or

below for Output Meter TS-585C/U and TS-585D/U).

Check for poor contact or no contact of wiper arms on rings of impedance control.

See paragraph 6-20 for cleaning and adjustment prodecures.

3. Meter indication only when impedance control is set at 400 ohms or above (at 1,250 ohms or

above for Output Meters TS-585C/U and TS-585D/U).

Check for poor contact or no contact of wiper arms on rings of impedance control.

See paragraph 6-20 for cleaning and adjustment procedures.

4. Meter indication too low at all positions of impedance control.

Step 1:

Check for poor calibration of output meter.

See paragraph 6-26 for calibration procedures.

Check for bad meter.

Step 2:

See paragraph 6-16 for testing procedures.

Step 3:

Check for bad axial resistor R2 or variable resistor R3.

See paragraph 6-10 for test and replacement procedures for R3.

See paragraph 6-13 for test and replacement procedures for R2.

Step 4:

Check for bad impedance control.

See paragraph 6-21 for testing procedures.

5. Meter indication too low when impedance control is set at 300 ohms or below (at 1,000 ohms

or below for Output Meters TS-585C/U and TS-585D/U).

Step 1:

Check for poor contact or no contact of wiper arms on rings of impedance control.

See paragraph 6-20 for cleaning and adjustment procedures.

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