PROBLEM
POTENTIAL CAUSE
CORRECTIVE ACTION
1. Unit does not
1. Power cord not
1. Connect power cord.
energize.
plugged in.
2. Circuit breaker open.
2. Reset circuit breaker
2. Unit energizes but
1. Worn brushes.]
1. Replace brushes
(para 1-8)
Motor does not rotate.
2. Adjust speed control
2. Speed control at
minimum.
(para 1-8b)
3. Speed control at
3. Replace speed control
maximum.
(para 1-8)
4. Armature
4. Clean with #400 emery
paper.
commutator dirty.
5. Replace motor
5. Open motor
windings.
3. Pilot light does not
1. Open pilot light.
1. Replace lamp.
glow.
4. Unit runs, but no
1. Tubing not
1. Connect tubing.
suction.
connected.
2. Bottles not sealed.
2. Tighten bottle tops.
3. Patient or bottle
3. Clear obstruction.
tubes blocked.
4. Tubing split or
4. Replace tubing.
cracked.
5. There is suction but 1. Defective gauge.
1. Replace vacuum
no reading on gauge.
gauge.
6. There is no suction
1. Plugged inlet
1. Replace inlet
but unit runs.
connector.
connector.
Table 1-2. Troubleshooting guide.
Figure 1-2. Removal of Variac speed control.
MD0365
1-9