(4) Apply a protective coating to the exposed
(c) Aline replacement L1 and secure with four
area after completing repairs.
screws and lockwashers.
b. Component Parts. To remove defective parts:
(d) Solder leads to replacement L1.
(1) Cut leads as close as possible between part
(5) Inductor L2.
and circuit board mounting holes.
(a) Tag and unsolder leads going through in-
ductor; remove defective inductor from spring clip
(2) Remove protective coating around lead con-
nections on the boards printed wiring side.
(3) Heat printed wiring at mounting holes until
(b) Insert replacement inductor over wires and
mount in spring clip mounting.
(4) Bend the leads of replacement part to fit
(c) Solder leads in their proper position.
(6) Inductor L3.
(a) Tag and unsolder leads from defective L3.
(b) Remove four screws and defective L3.
Transistors must have mounting pads on
(c) Aline replacement L3 and secure with four
them before inserting into circuit board.
(5) Insert leads through mounting holes from
(d) Solder leads to replacement L3.
parts side of circuit board.
(7) Transformers T1 and T2.
(6) Press part firmly against board.
(a) Remove A1 (para 2-9e).
(7) On circuit boards wiring side, cut leads leav-
(b) Remove A2 (para 2-9f), but do not unsol-
ing 1/8 inch protruding.
der lead connections.
(8) Bend and press the leads against the printed
(c) Remove hex nut, lockwasher, flatwasher,
nylon insulating washer and rubber insulating
(9) Quickly solder leads to printed wiring con-
(d) Remove transformer.
(10) Apply a protective coating to all repaired
Although not removed, large rubber insu-
c. A1 PCB Connector P1 and P2 Replacement.
lating washer and flat head screw must be
(1) Remove liquid staking from two hex nuts.
in position before replacement trans-
(2) Remove two hex nuts, four flatwasher, and
former is installed.
(e) Remove flatwasher and screw from trans-
(3) When removing defective connector, cut all
pin leads as close as possible between connector and
circuit board mounting holes.
(f) Install screw and flatwasher into replace-
(4) Remove protective coating around lead con-
ment transformer. Insert into heatsink.
nections on the circuit boards printed wiring side.
(g) Install rubber insulating washer, nylon in-
sulating washer, flatwasher, lockwasher, hex nut,
(5) Heat printed wiring at mounting holes with
iron until solder melts.
(6) Remove excess solder and remaining pieces
(h) Solder all leads to their proper connections.
(i) Replace A2 (para 2-9e).
(7) Ensure lead mounting holes are free of sol-
(j) Replace A1 (para 2-9f).
2-11. Printed Circuit Board Repair
(8) Aline connector insert leads through mount-
ing holes from parts side of circuit board.
a. Printed Circuit Wiring Repair. Repair printed
(9) Press connector firmly against board, ensur-
wiring that has a crack, pinhole, cut or notch more
ing connector is flat.
than 30 percent of the wires width as follows:
(10) Install two screws, four flatwashers, two
(1) Remove protective coating.
hex nuts, and tighten.
(2) Place a short length of flat bus wire over the
(11) Bend and press the lead against the printed
(12) Quickly solder leads to printed wiring con-
Use a pencil-type soldering iron with a
25-watt maximum rating. Too much heat
(13) Cut off any lead excess over 1/16 inch.
from the iron will damage the printed wir-
(14) Apply liquid staking to two hex nuts and
ing of circuit boards.
then apply protective coating to all repaired exposed
(3) Solder the entire length of bus wire to the
printed circuit wiring.