Cleaning (CRC).

TM 55-4920-430-13

4-30. Disassembly of Card Cage (CRC).

a. (See fig. 5-4.) Remove the panel from the case (para 4-29).

b. Remove five circuit cards (para 4-32).

Remove six screws and washers, that secure the card cage to the chassis.

d. Remove card cage for access to the switches.

4-31. Cleaning (CRC).

a. Inspect the exterior of the equipment. The exterior should be free of dust, dirt, grease, and fungus.

Remove dust and loose dirt with clean soft cloth (item 2, table 4-1 ).

Isopropyl alcohol is toxic. It can irritate skin and cause burns. Avoid

inhaling. Use only with adequate ventilation. Avoid contact with skin,

eyes, or clothing. In case of contact, immediately flush skin or eyes

with water for at least 15 minutes. Get medical attention for eyes.

b. Clean exposed switch contacts with isopropyl alcohol (item 1, table 4-1 ).

Use a vacuum cleaner and soft brush to remove dirt and dust from the test set chassis and the in-

terior of the case.

Dry cleaning solvent, type I is combustible and toxic. It can irritate skin

and cause burns. Use only with adequate ventilation, away from open

flame. In case of contact, immediately flush skin or eyes with water for

at least 15 minutes. Get medical attention for eyes.

d. Remove grease or oil with a cleaning cloth (item 2, table 4-1) moistened with dry cleaning solvent

Trichloroethane is toxic. It can irritate skin and cause burns. Use only

with adequate ventilation. Avoid contact with skin, eyes, or clothing. In

case of contact, immediately flush skin or eyes with water for at least

15 minutes. Get medical attention for eyes.

e. Clean exterior of the case and the panel, with cleaning cloth moist with trichloroethane (item 4,

4-6