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Fig. 7
501-Type Telephone Set, Tube Assembly
-
(a)
Ringer:
•
M o u n t e d to b a se w ith t w o P - 4 3 A 4 5 6
washerhead mounting screws i n rubber
grommets.
•
Ringer off position can be provided, when
authorized locally, by bending back ringer
stop spring to provide a fifth position (OFF)
on the ringer volume control.
Note:
equipped with a handset cord retainer (boss)
for use with 500- and 501-type telephone sets
(Fig. 6).
(b)
Handsets:
these sets may be replaced by a G6AR (MD)
or G6B handset for impaired hearing, a G'tAR
for weak speech, or a GSA (MD) or G8B for
noisy locations. Refer to section covering amplifier
handsets for additional information.
4.
MAINTENANCE
.For maintenance information on plungers,
4.01
bracket switch assemblies and switch contacts,
refer to Section 502-500-110, Common Installation
and Maintenance.
4.02
Current models of the 500L/M, 500R/S,
500W, and 500Y are equipped with a C4B
(two lead) ringer.
BSP 502-501-115-i02_1971·0S-05 .jpg
Scanned by Frank Harrell, !Cowboy Frank) Castle Rock, Colorado Jan 29, 2012 23:49:39
Current model C4-type ringers are
The G1- or G3-type handsets in
When ringer replacement is
necessary in sets having a C4A (four lead) ringer
changes are required when a C4B is used (Fig. 17,
18, 20, and 22) .•
(a)
Tube Assembly:
•
Where excessive power induction exists, a
425A, 4-element tube may be substituted
P-43AI06
SCREW
for 426A. See section on inductive noise.
•
Tube assembly is held to base of set with
single screw (Fig. 7).
(b)
Dial Light:
and lamp counterclockwise (Fig. 9) and lift
out.
(c)
Lamp Cap Retainer Ring:
•
500W /Y and 514B telephone sets can be
equipped with P-14E582 retainer ring (Fig. 10)
to p r e v e n t p i l f e r a g e o f t h e l a m p c a p
assembly.
•
Install retainer ring as follows:
(1) Remove set housing with lamp cap in
place.
(2) Press two tabs of retainer ring together.
ISS 2, SECTION 502-501-115
Fig. 8-Typical Turn Key
To remove, turn lamp cap
Page 5
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