Maintenance - Bell System Practices 220 Identification, Installation, Connections, And Maintenance

SECTION 502-303-1 02
with the lip of the grommet protruding outside
the assembly.
(5) Place the receiver unit in the coil assembly
(Fig. 12).
(6) With the receiver unit in place in the coil
assembly, install the gasket on top of the
receiver unit (Fig. 13). Place complete assembly
in the chassis assembly receiver cup.
In
order to pro perly insert the receiver
unit with the receiver coil into the
receiver cup, hold handset in an upright
vertical position with the varistor
across
top.
receiver
to the chassis assembly receiver
cup (Fig. 14).
(7) Loosen the two (2) network receiver cup
mounting screws (Fig. 15) on back side of
the receiver cup.
black (BK) coil leads under each screw (Fig.
16).
(8) Reassemble the handset.
(9) Install the card (Fig. 11) which identifies a
coil equipped handset in location where the
cover above the dial was removed.
(clear) card retainer over the card.
4.

MAINTENANCE

Field maintenance of these hand telephone
4.01
sets is limited to the replaceable components
listed in the ordering guide, paragraph 2.10.
To replace a dial lamp in the 220A, 220AM,
4.02
2220B, or 2220BM hand telephone set, remove
the cover (Fig. 1).
be used to remove the lamp (Fig. 17).
caution to prevent
out of the socket in a dangerous manner.
In early production handsets use a 553A tool to
remove the lamp from its vertical position (Fig.
18).
Lamps carried for maintenance reasons
Note:
should be 53A since both early and current
production handsets accommodate this type.
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BSP S02-303-102-i02_19 79-12-10.jpg
the receiver unit
Carefully place unit in the
cup and snap retainer
Terminate one (1) of the
A KS-6320 orange stick can
the lamp from
To replace the 315-type amplifier in 226A
4.03
or 2226A handsets, proceed as follows.
(1) Remove shell from handset, paragraphs 3.01
and 3.02.
(2) Remove the network receiver cup mounting
screw and the three (3) 315-type amplifier
network connecting screws (Fig. 19).
raise the flexible circuit boa�d (network) and
remove the amplifier receiver cup mounting
screw (Fig. 20).
catch by depressing with a KS-21107L1 or
equivalent releaser as shown in Fig. 21, and lift
amplifier out.
at the
(3) Install replacement amplifier in reverse
order used in removal and reassemble of
handset.
To replace a transmitter or receiver unit in
4.04
220C, 226A, 2220C, or 2226A handset, proceed
as follows.
(1) Remove shell and chassis from handset
paragraphs 3.01, 3.02 and Fig. 7.
(2) Twist and lift off the transmitter and/or
receiver unit, retainer, and grommet from
the cup on the chassis.
(3) Separate the defective unit from the grommet
Place the
and retainer.
(4) Install replacement unit in reverse order
used in removal and reassemble of handset.
Exercise
flying 5. CONNECTIONS
To restrict the dial on the 220A, 220AL
5.01
(early version), or 220AM hand telephone
set, place a strap between the pulsing contacts as
shown in Fig. 22. On the 220AL (current version)
place a strap between the two (2) screws located
on the flexible circuit board above the dial.
the 220C or 226A place an insulated strap between
Feb 07,2012 13:29:51
Release the amplifier spring
In
order to properly insert the receiver
unit into the receiver cup, hold handset
in an upright vertical position with
the varistor across the receiver unit
at the top. Carefully place unit
in the receiver c u p
retainer to the chassis assembly.
Carefully
a n d snap
In