Replacement of Chassis Components (CRC).

55-4920-430-13

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

(9) Perform heading and attitude variable analog signal test (para 4-51).

f . Replacement of synchro B1. (See fig. 5-4.)

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

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

(3) Remove the four screws and washers that secure the synchro.

(4) Remove the synchro.

(5) Position the replacement synchro in the panel.

(6) Secure the synchro with four screws and washers.

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

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

(9) Perform synchro electrical zeroing (para 4-38).

(10) Perform heading and attitude variable analog signal tests (para 4-51).

g. Replacement of lamp holder or circuit breaker. (See fig. 5-4.)

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

(2) Tag and unsolder the wires or remove screws from the terminals of the circuit breaker or la np holder.

(3) Remove the nut and washer that secure the component to the panel.

(4) Remove the component from the panel.

(5) Position the circuit breaker or lamp holder on the panel.

(6) Install the nut and washer.

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

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

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

4 - 3 4 . Replacement of Chassis Components (CRC).

NOTE

Refer to the wiring diagrams (FO-55) for components orientation and

wire connections.

a. Replacement of power supply or transformers. (See fig. 5-4.)

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

(2) Tag and unsolder the wires from the power supply or transformer.

(3) Remove four screws or four nuts and washers that secure the power supply or transformer.

Note its orientation.

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