TM 5-3610-286-20
Table 2-5. Organizational Troubleshooting (cont).
Malfunction
Test or inspection
Corrective action
3. MAIN POWER CONTROL LIGHT LIGHTS, BUT MAIN DRIVE MOTOR (ml) DOES NOT OPERATE WHEN
OPERATION PUSHBUTTON (b14) IS PRESSED (cont).
Step 6.
Using a multimeter set to ohms scale, perform continuity check on OPERATION
pushbutton (b14).
If continuity is present, go to step 7.
If no continuity is present, replace pushbutton (b14) (para. 2-94).
NOTE
To check for power between connections U1, V1, and W1, push contactor
(c2) button.
Step 7.
Using a multimeter set to range higher than 220V ac, check between U1 and V1,
U1 and W1, and V1 and W1 on terminal strip for 220V ac.
If power is present, go to step 8.
If no power is present, replace wiring between contactor (c2) and
terminal strip (figure FO-1).
NOTE
In order to perform the following step, belt guard (para. 2-17) must be
removed.
Step 8.
Using a multimeter set to range higher than 220V ac, check for 220V ac between
connections U1 and V1, V1 and W1, and U1 and W1 of main motor (ml).
If power is present, go to step 9.
If no power is present, replace wiring between main motor and terminal
strip (figure FO-1).
Step 9.
Check main drive motor (ml) commutator and slipring brushes for dirt, damage,
or excessive wear (para. 2-79). Remove dirt or debris. Replace damaged or
worn brushes (para. 2-79). Check thermal overload device. if motor does not
operate, replace motor (2-79).
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