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 TM 55-1905-219-14-11
5-145. MILK DISPENSER - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
REPAIR (Cont)
1. Milk Dispenser.
a. The electrical system on the compressor can be checked with an ordinary test lamp as follows:
(1) With compressor plugged into test lamp. The following must light:
(a) L1 and L2. If no light, check power source.
(b) L and 3. If no light, make sure control contacts are closed.
(c) M and 3. If no light, relay circuit is open. Replace relay.
(d) M and 1. If no light, overload may be tripped off. Wait 10 minutes. If no light, replace defective overload.
(2) Remove wires from L and 3 and insert test lamp in series with L1 and 3. Momentarily touch L2 to following
points in
sequence:
(a) S - If no light, start winding is open. Replace compressor.
(b) R - If no light, run winding is open. Replace compressor.
(c) S1 - If no light, Lead SI-S should be replaced.
(d) M - If no light, lead M-R should be replaced.
(e) L - If no light, replace relay.
(3) Remove lead M-R and insert test lamp in series with L1 and 3. If light shows when L2 is touched to L1 relay
should be replaced. A new relay will eliminate any faulty electrical characteristics, such as improper pickup or drop out,
which cannot be determined with a test lamp.
b. If all above tests prove satisfactory, and there is no capillary restriction, and unit still fails to operate properly with
a good relay, compressor should be replaced.
5-1470
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