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Page Title:
TRANSFORMER, RECTIFIER, CAPACITORS, AND HARNESS. (Cont) |
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 TM5-4120-383-14
TRANSFORMER, RECTIFIER, CAPACITORS, AND HARNESS.Continued
4-32.
(c) Apply 208 volts AC to terminals 2 and 5 (input
Voltage at transformer terminals 7 and 8 should be 27
terminals).
to 33 volts AC. Remove power from transformer. Replace defective
transformer.
(2) Rectifier CR1.
(a) Tag and disconnect leads.
(b) Using a multimeter on high ohms setting connect
negative (-) lead to terminal 2 and positive (+) lead to terminal 1
or 3. A low resistance reading should be obtained.
(c) Connect positive lead to terminal 2 and negative lead
to terminal 1 or 3. A very high resistance or open circuit reading
should be obtained.
(d) Connect positive lead to terminal 4 and negative lead
to terminal 1 or 3. A low resistance reading should be obtained.
(e) Connect negative lead to terminal 4 and positive lead
to terminal 1 or 3. A very high resistance or open circuit reading
should be obtained.
(f) Replace defective rectifier.
NOTE
When rectifier CR1 is replaced capacitors C1 and C2
should also be replaced.
(3)
Capacitors.
(a) Disconnect one lead of capacitor from circuit.
(b) Using an ohmmeter set to read high resistance, place
Place
the positive (+) probe on disconnected capacitor lead.
negative (-) probe of ohmmeter on the second lead of capacitor
while watching ohmmeter needle.
(c) The ohmmeter needle should move only very slightly or
If needle moves quickly to top of the scale and
not at all.
remains there, capacitor contains a short circuit and must be
replaced.
4-88
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