TROUBLESHOOTING PROCEDURES

TM 11-6665-209-40

CAUTION

This equipment is transistorized. Before connecting test equipment,

insulate test prods and clips with insulating tape. Leave an absolute

minimum of exposed metal, and be extremely careful to avoid short

circuits, they may cause extensive damage. DO NOT make

resistance measurements unless specifically directed to do so.

2-5. TROUBLESHOOTING PROCEDURES

The malfunctions listed in table 2-2 are presumed to exist after all lower level

troubleshooting procedures and corrective actions have been performed. Perform correc-

tive actions in the order given. Do not proceed to the next action when the measures

already taken have eliminated the trouble. Use resistor and capacitor color codes (Fig.

FO-1) to find the value of components.

Table 2-2. TROUBLESHOOTING PROCEDURES

HIGH VOLTAGE (900 VOLTS) is present in this equipment.

SYMPTOM

PROBABLE TROUBLE

CORRECTIVE PROCEDURE

1. Range Scale does not change properly.

Loose set screw-in mechanical train.

Tighten set screw (para. 3-2).

2. No battery indication on meter.

Step 1. Defective meter.

Press meter light switch. If light comes on, check meter.

If light does not come on go to Step 2 below.

Step 2. Battery connections defective.

Check all battery connections; trace voltage path with multimeter

f r o m battery compartment to range switch.

2-4