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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
32
During
0.3
Rotary switches
Check mechanical operation of each rotary
Damaged or
switch. Replace any worn or incorrectly
defective parts.
operating parts.
33
During
2.0
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.
34
During
0.3
Indicator Lamps
The CALL lamps at the called station(s)
should be lit. The REL lamp at the calling
station should be lit. If the called station
is busy,the BUSY light should be lit.
35
During
0.3
Control Switches
Check the control switches. Vary the
position of the dimmer control switch
and observe the intensity of the panel
illumination. Vary the VOLUME
control during reception, and verify
that the intensity of received speech is
controlled.
36
During
0.3
Hands Free
Check the hands free capability by
One or more
Operation
operating hands free with another
unit malfunctions
station in the system.
occur.
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 00-16
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