COOLING AIR FILTER CLEANING

T.O. 31W2-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3010

1. Loosen and remove printed circuit card

2. From reverse (inner) side of cover, dislodge

access cover (figure 6-2) located at front of chassis.

and remove any dust and foreign matter from the filters,

using a low-pressure stream of compressed air.

NOTE

Steps 2 through 4 must be repeated for

If dust and foreign matter cannot be

each TE/TR card in slots 1 through 15 of

removed with compressed air, the entire

MUX row.

access cover assembly may be carefully

2. Connect frequency counter to test point

cleaned by immersing it in a mild solution

TP8 of the TE/TR card and measure output frequency of

of soap and water. If cleaned with soap and

oscillator Y1.

water, ensure that the entire cover

assembly is thoroughly dried before

3. Determine that the frequency measured at

installing it on the multiplexer set chassis.

TP8 is 9.8304 MHz + 4915 Hz.

3. Install and tighten printed circuit card

4. If the measured frequency is within

access cover.

tolerance and all TE/TR cards have been calibrated,

proceed to step 5. If the measured frequency is not

6-37. INSPECTION.

Visual inspection of the

within tolerance on a given TE/TR card, replace the card

multiplexer set is performed to detect faulty wiring and

as prescribed in paragraph 6-22 and repeat steps 2

general degradation of protective finishes. Perform

through 4 for the replaced card.

inspection procedures as follows:

5. Install and tighten printed circuit card

1. Visually examine exposed painted surfaces

access cover.

of multiplexer set chassis for evidence of chipped or

scratched paint.

NOTE

2. If damage to painted surface is evident,

If the cooling air filter is to be cleaned at

refer to paragraph 6-29 for corrective maintenance

this time, the printed circuit card access

instructions.

cover may be left off.

NOTE

6-36. COOLING AIR FILTER CLEANING.

The

cooling air filters located on the printed circuit card

Extension of the multiplexer set upon its

access cover (figure 6-2) will be cleaned monthly to

mounting slides solely for purposes of

ensure a free flow of air through the multiplexer set.

inspecting the cabling is not recommended.

Perform cleaning procedures as follows:

If the cabling is not readily visible with the

equipment in its normally installed position,

1. Loosen and remove printed circuit card

it is recommended that inspection of the

access cover (figure 6-2) located at front of chassis.

cables be postponed until the equipment is

extended for corrective maintenance or

other reasons.

6-36