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
1
Controls, screws,
Inspect all controls and mechanical assemblies for
bolts
loose or missing knobs, screws, bolts, and nuts.
2
Connectors fuse
Inspect all connectors, sockets, and receptacles
holder fuses
including the fuses, fuse holder, for looseness and
damage.
3
Modules
Visually inspect exterior and component side of
modules for scorched parts or broken connections or
blown fuses.
4
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.
5
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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