AT&T Bell System Plant Adjustment Procedure page 7

(
assembly directly associated with the plunger
· spring make by
Test
-Min 0.005"
Readjust - Min 0.006"
Gauge by eye.
(b)
Cross Sequence-Break-Make Combina-
tion on Ringing and Coin Control Spring
Assemblies or When Specified on Circuit Draw-
ing: Fig. 12(B)- Unless otherwise specified,
all normally closed contacts operated by the
depression of a plunger shall break before
any of the normally open contacts make by
Test - Min 0.005"
Readjust - Min 0.006"
Gauge by eye.
'----(B)
Fig. 12 - Illustrating Cross Sequence
Fig. 13 Fig. 14
Illustrating Special Sequence
(c)
Special Sequence-Coin Control Spring
Assemblies: Unless otherwise specified,
the normally closed contact on the ring side
(rear or right) of the key shall break before
the normally closed contact on the tip side
(front or left) of the key breaks.
Gauge by eye.
Exception: On spring combinations as shown
in Figs. 13 and 14, the "A" contact shall
break before the "B" contact breaks.
Gauge by eye.
(d) Other Contact Sequence: When specified
on the circuit requirement table or circuit
drawing.
ISS 5-D, SECTION 032-714-701
2.13
Plunger Operate Pressure: Figs. 15(A)
and 16(A)- The pressure required to de-
press a plunger to the end of its stroke shall be
TEST READJUST
GRAMS GRAMS GAUGE TYPE OF KEY
(a) Max 2150 2050 79F On 503- and
6008-type keys,
this reqt ap-
plies to non-
locking plung-
ers only.
(b) Max 2400 2300 79F On B18E,
B18H, and
B18J keys, this
reqt applies to
front units
only.
(c) Max 1950 1850 79F On B18E,
B18H, and
B18J keys, this
reqt applies to
rear units
only.
(d)
!
Min 600
Max 1500
(e) Max 1250
(f) Max 575
675 79B On 503- and
6008-type keys,
this reqt ap-
plies
to
locking
1400 79F plungers only.
1150 79F This reqt ap-
plies to locking
plungers only.
500 79B
Note: Reference shall be made to the re-
quirement table for requirements for the
particular key.
2.14
Plunger NonoperatePressure: Fig. 17(A)
(a) A pressure of
Test - 200 grams
Readjust -225 grams
shall not move a plunger which locks in the
intermediate position from its normal position.
All other plungers shall not move out of their
normal position by a pressure of
Test - 180 grams
Readjust - 200 grams
Use the Nos. 79B and 79C gauges.
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