Disassembly of Heatsink.

TM 11-6130-429-40

NOTE

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.

P2.

NOTE

(c) Tag and unsolder all wires from defective

connector.

C14, C15 + bus bar is nearest to rear

(d) Remove defective connector.

panel.

(e) Solder capacitors to replacement connec-

(d) Install new capacitor with + terminal to +

tor.

bus.

(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

screws.

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-

CAUTION

lating washer.

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

mounting.

(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.

panel.

(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

inch-pounds.

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-

ble).

c. Disassembly of Heatsink.

sembly.

(f) Ensure that large insulating washers have

NOTE

a small amount of thermal paste applied evenly to

Heatsink removal is NOT required re-

both sides.

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-

NOTE

lating washer, flatwasher, hex nut and finger

Tag wire terminal lugs where applicable.

tighten.

(a) Remove two screws, lockwashers, and

(i) Aline Q7 and solder lug to original position,

flatwashers.

tighten and torque hex nut to 25 inch-pounds.

(b) Remove defective capacitor by cutting two

(j) Install and solder Q7 leads, capacitor C16

cable ties.

and resistor R9.

(c) Insert two new cable ties through their

(k) Apply liquid staking to hex nut.

mounting holes.

(5) Switch S2.

WARNING

(a) Tag and disconnect all leads from defective

Positive (+) terminal of capacitor MUST

switch.

be connected to + bus bars. Serious injury

2-27