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 TM 55-1905-219-14-9
4-47. ALARM SWITCHBOARD-MAINTENANCE INSTRUCTIONS (Continued).
No oil of any kind should be used anywhere on the two line units
or the assemblies of which these units are composed. These
units are energized with 120V A.C. and depend upon the
minimum electrical clearances for insulation. Oil used anywhere
on the assemblies in very likely to break down these clearances
and cause flashovers and short circuits.
(3) Alarm Panel.
(a) The alarm panel door should be opened periodically and all electrical connections choked for proper
tightness. Wiring should be checked at the same time for chafing.
(b) All lamps should be kept in operating condition. Defective bulbs should be replaced immediately
upon discovery. All lamps except the type NE 79 (Neon) " est Light" PL1, are Type VG-7 (Neon) lamps.
T
,
Sockets for these lamps should be checked occasionally to see that the socket contacts are clean and making
good contact with the lamps. The trouble buzzer, Z, should be tested periodically and kept in proper
adjustment. All securing screws should be kept tight.
g. The following is an index of the maintenance instructions.,
DESCRIPTION
PARAGRAPH
Alarm Switchboard
2-Line Alarm Panel
4-1209/(4-1210 blank)
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