Connection Repair

TM 11-6660-204-25

b. Unsolder the top and bottom wires from the

3-39. Connection Repair

circuit breaker.

Repair connections by resoldering the lead to the

c. From the front side of the panel, remove the two

component. If a lead is shortened in the process of

circuit breaker mounting screws and remove the cir-

repairing a connection; insure that the lead is long

cuit breaker.

enough so no tension exists. If not enough of the lead

d. Install the circuit breaker in the panel and in-

is left after shortening, remove the lead and replace

stall and tighten the two mounting screws.

with one of the same wire size, same insulation char-

e. Solder the top and bottom wires to the circuit

actitistics, and of sufficient length.

breaker terminals.

f. Remove the masking tape.

3-40. Wiring Replacement

a. Loosen any clamps holding the wire(s) to be

3-43. Indicator Meter Installation

replaced.

Install the POWERLINE VOLTAGE or PO-

b. Remove the clamps closest to the connectors in

WERLINE FREQUENCY indicator as follows:

which the wire(s) terminate.

a. Use masking tape to identify the position of

c. Remove the screws holding the connectors and

each wire to be removed.

remove the connectors from their mounting brack-

b. Unsolder the wires.

ets. Remove the shells from the connectors.

c. Remove the meter mounting screws from the

CAUTION

front of the panel.

To avoid equipment damage and errone-

d. Remove the indicator, install the replacement

ous data, be careful that small flakes of

indicator, and install the panel screws.

solder do not fall into the connector.

e. Solder the wires to the back of the indicator.

d. If the wire to be replace is connected to a termi-

3-44. Knob Installation

nal around the outside perimeter of the connector,

unsolder the wire to be disconnected and solder the

The control panel knobs are held onto their shafts by

new wire in place.

means of a setscrew. Remove knobs by loosening the

e. If the wire to be replaced terminates near the

setscrew and pulling the knob from its shaft. Install

center of the connector, it may be necessary to dis-

knobs by pushing the knob on the shaft and tighten-

connect one or more wires in order to gain access to

ing the setscrew. The signal selector knob should be

the wire to be replaced. Before unsoldering any wires,

installed so that at its extreme counterclockwise ro-

note their terminal numbers on a piece of tape and

tation, it points to SIG. The SPEAKER VOL. knob

attach the tape to the wire about 5 inches back from

should be installed so that at the extreme counter-

the connector. Do this with each wire to be unsol-

clockwise position, it points to the 7 o'clock position.

dered, including the wire to be replaced. Unsolder the

3-45. Control Panel Light Assembly Replacement

wires, replace the defective wire, and resolder all

wires.

Replace the control panel light assembly as fol-

f. Repeat the previous step with the other connec-

lows:

tor.

a. Tag the leads with tape and unsolder the leads

g. Remove the tape, replace the connectors, and

to the light.

secure the clamps.

b. Remove the mounting nut and lockwasher from

h. Use a multimeter to check continuity of the

the rear of the panel.

wire(s) replaced (see fig. FO-7 and FO-8). Also check

c. Install the new light assembly on the front of

for short circuits between all terminals of both con-

the control panel.

nectors.

d. Install the mounting nut and lockwasher to the

rear of the panel.

3-41. Systems Connecting Cables Replacement

e. Solder the wires to the light assembly.

To replace systems connections cables, refer to para-

f. Remove the tape from the wires.

graph 2-8 (fig. 2-6) of TM 11-7770-204-10, para-

3-46. Loudspeaker Replacement

graph 2-8 and figure 2-6 of this manual.

Replace the loudspeaker as follows:

3-42. Circuit Breaker Installation

a. Unsolder the wires to the loudspeaker.

Install a circuit breaker on the control panel as fol-

b. Remove the four nuts, bolts, and lockwashers

lows:

that retain the loudspeaker to the panel.

a. Identify the top and bottom leads to the circuit

c. Install the new speaker to the panel by means of

breaker by noting their positions on masking tape

the four nuts, bolts, and lockwashers.

attached to the wires.

d. Solder the wires to the new speaker.

3-27

Change 3