to personnel and damage to equipment
will occur if correct polarity connections
C19 is located on P1 and C20 is located on
are not made.
(c) Tag and unsolder all wires from defective
C14, C15 + bus bar is nearest to rear
(d) Remove defective connector.
(e) Solder capacitors to replacement connec-
(d) Install new capacitor with + terminal to +
(f) Solder all wires to replacement connector.
(e) Replace any terminal lugs removed and se-
(g) Install replacement connector in rear panel
cure with two flatwashers, lockwashers, and screws.
and secure with two flatwashers, lockwashers and
(f) Tighten both cable ties around capacitor
and remove any excess.
(2) Diodes CR12 through CR15, CR20 and CR21
(2) Capacitors, diodes, and resistors.
(a) Unsolder leads from cathode of diode.
(a) Unsolder and remove defective part, not-
(b) Remove liquid staking from hex nut of de-
ing polarity marks where applicable.
fective diode (if applicable).
(b) Solder replacement part in proper position.
(c) Remove hex nut, flatwasher, and mica insu-
C16 positive must be connected to gate of
(d) Remove defective diode from rear panel.
Q7 for proper operation.
(e) Remove nylon insulating washer from di-
(3) Inductor L4.
ode mounting hole.
(f) Pull solder lug slightly away from rear
(a) Tag and unsolder leads going through in-
panel and remove mica insulating washer.
ductor. Remove defective inductor from spring clip
(g) Inspect both mica insulating washers for
holes and cracks.
(b) Insert replacement inductor over wires and
mount in spring clip mounting.
(h) If they both are good, install one between
(c) Solder leads in their proper position.
solder lug and rear panel.
(4) Thyristor Q7.
(i) Line up holes and press the solder lug back
(a) Tag Q7 leads, remove with capacitor C16
into position against the rear panel.
and resistor R9.
(j) Install nylon insulating washer in rear
(b) Remove liquid staking from hex nut.
(c) Remove hex nut, flatwasher, large insulat-
(k) Install new diode in rear panel.
(l) Replace mica insulating washer,
ing washer, and small insulating washer.
flatwasher, hex nut, tighten and torque to 25
(d) Slowly remove defective Q7, allowing large
insulating washer to drop out and carefully set solder
lug aside so lead connection is not damaged.
(m) Solder leads to cathode of diode.
(e) Inspect both large insulating washers for
(n) Apply liquid staking to hex nut (if applica-
holes or cracks. If they both are good, save for reas-
c. Disassembly of Heatsink.
(f) Ensure that large insulating washers have
a small amount of thermal paste applied evenly to
Heatsink removal is NOT required re-
placement of all parts.
(g) Insert replacement Q7 through solder lug,
(1) Capacitors C14 and C15.
large insulating washer, and heatsink.
(h) Install small insulating washer, large insu-
lating washer, flatwasher, hex nut and finger
Tag wire terminal lugs where applicable.
(a) Remove two screws, lockwashers, and
(i) Aline Q7 and solder lug to original position,
tighten and torque hex nut to 25 inch-pounds.
(b) Remove defective capacitor by cutting two
(j) Install and solder Q7 leads, capacitor C16
and resistor R9.
(c) Insert two new cable ties through their
(k) Apply liquid staking to hex nut.
(5) Switch S2.
(a) Tag and disconnect all leads from defective
Positive (+) terminal of capacitor MUST
be connected to + bus bars. Serious injury