Replacement of chassis mounted resistor

TM 55-4920-430-13

(4) Remove the power supply or transformer from the chassis.

(5) Coat mounting surface and bottom of power supply or transformer with heat sink compound

(item 6, table 4-1). Secure the replacement power supply or transformer to the chassis. Use four screws

or four nuts and washers.

(6) Solder the wires to the terminals. Use solder (item 5, table 4-1). Remove the tags.

(7) Install the panel in the case (para 4-39).

(8) Perform DC power supply voltage adjustments as applicable (para 4-36).

(9) Perform final test (para 4-40).

b. Replacement of chassis mounted resistor. (See fig. 5-4.)

(1) Remove the panel from the case (para 4-29).

(2) Tag and unsolder the wires from the resistor terminals.

(3) Remove two screws and washers that secure the resistor to the chassis. Remove the resistor.

(4) Position the replacement resistor on the chassis. Secure the resistor with two screws and

washers.

(5) Solder the wires to the resistor terminals. Use solder (item 5, table 4-1). Remove the

tags.

(6) Install the panel in the case (para 4-39).

(7) Perform final test (para 4-40).

Replacement of rf filters FL1 thru FL4. (See fig. 5-4. )

(1) Remove the panel from the case (para 4-29).

(2) Tag and unsolder the wires from the filters.

(3) Remove the nut and washer that secures the filter to the bracket.

(4) Remove the filter from the bracket.

(5) Position the replacement filter on the bracket.

(6) Secure filter with the nut and washer.

(7) Solder the wires to the filter terminals. Use solder (item 5, table 4-1). Remove the tags.

(8) Perform power section check (para 4-44).

(9) Install the panel in the case (para 4-39).

d. (Test Sets with MWO 55-4920-430-50-1). Replacement of diode CR15. (See fig. 5-4.)

(1) Remove the panel from the case (para 4-29.)

(2) Tag and unsolder the wires from the diode.

(3) Remove the nut, insulator, bushing insulator, lug, and diode from the bracket.

(4) Install the replacement diode, insulator, bushing insulator, lug, and nut.

(5) Solder the wire from plug J7 pin E to the anode of diode CR15. Solder the wire from filter

FL3 to the diode terminal lug.

(6) Perform power section check (para 4-44.)

(7) Install the panel in the case (para 4-39.)

Change 2

4-10