Table 5-1. ORGANIZATIONAL PREVENTIVE MAINTENANCE CHECKS AND SERVICES SWEEKLY SCHEDULE

TM 11-7440-232-12/ NAVELEX 0967-LP-275-5010

Table 5-1. ORGANIZATIONAL PREVENTIVE MAINTENANCE CHECKS AND

SERVICES WEEKLY SCHEDULE

Item No.

Item to be

Procedures

inspected

Controls, screws,

Inspect all controls and mechanical assemblies for

bolts

loose or missing knobs, screws, bolts, and nuts.

Connectors fuse

Inspect all connectors, sockets, and receptacles

holder fuses

including the fuses, fuse holder, for looseness and

damage.

Modules

Visually inspect exterior and component side of

modules for scorched parts or broken connections or

blown fuses.

Finish

Inspect case (or chassis) for damage, missing parts,

and condition of finish and panel lettering. Painted

external surfaces do not show bare metal. Panel

lettering legible.

Transmit Branch

On transmitter, set BIT RATE switch to LOW position

and TRANS MODE switch to PATT position. On

limiter discriminator, set REC MODE switch to NORM

position.

Set POWER switch on power supply to ON position;

Allow a 30-minute warm-up of digital data modem.

Connect a VTVM between GRD (TP4) and Line (TP3)

test points on transmitter. Observe VTVM output

level indication. POWER lamp lights. The VTVM will

indicate between -10 and +6 dbm (unless otherwise

specified) and will provide a signal at the distant

terminal that will be between -30 and +10 dbm (as

measured at limiter input).

NOTE

On telephone company lines, the transmit level is usually -8 dbm. On

private communication facilities, the level is generally 0 dbm to open

wire or cable lines, or 10 dbm below test tone level to carrier or

microwave equipment.

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