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 TM 55-1925-273-10-2
0137 00
Table 1. Preventive Maintenance Checks and Services Including Lubrication (continued)
ITEM INTERVAL MAN-
ITEM TO BE
PROCEDURE
EQUIPMENT
NO.
HOUR
CHECKED OR
NOT READY/
SERVICED
AVAILABLE IF:
INTERCOM
SYSTEM
90
Monthly
0.3
Exterior
Visually inspect exterior for damage,
water accumulation, or dirt buildup.
Clean using a soft cloth.
91
Monthly
0.3
Hardware
Inspect mounting hardware for tightness.
Tighten as necessary.
92
Monthly
0.3
Rotary switches
Check mechanical operation of each.
Damaged or
Replace any worn or incorrectly
defective parts.
operating parts.
93
Monthly
0.5
Unit performance
Check the two-way voice capability of the
master station. Select the other stations on
the system and conduct a two-way
conversation. Transmissions and
receptions should be clear, undistorted
and easily understood.
Indicator Lamps
Mounting Hardware
REL
CALL
BUSY
Pushbuttons
PRESS
TO
RE-
LEASE
PRESS
TO
RE-
Control Switch
LEASE
DIMMER
VOLUME
Rotary Switch
OFF
HANDS
MIC OR
FREE
MAL
PRESS
HANDSET
Hands Free Switch
TO TALK
0137 00-42
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