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1SS 5, SECTION 501-164-201
(6) Remove the two mounting screws for the Line
Sensing Relay Board and move the board as-
sembly to one side.
(7)
Disconnect the leads of the Line Sensing Relay
Board from associated
terminals
on the PSB,
and remove the board assembly.
(8)
Connect the leads of the replacement
Line
Sensing Relay Board to the appropriate
termi-
nals on the PSB (Fig. 9B and 9C for the 870A1 dial
or Fig. llB and llC for the 2870A1 dial).
(9)
Reassemble adjunct dial.
(10) Reconnect battery and power unit.
(11 ) Reprogram
memory, see Part 5.
F.
Faceplate
(conversion
from
870A2
or 2870A2
to
870B1 or 287061)
6.08
Replace an 870A2-87 or 2870.42-87 faceplate
with an 870B1-87 or 2870 B1-87 faceplate
as
follows.
(1) Remove the A2 faceplate by lifting up on any
of its edges.
(2)
Remove the four captive housing screws (Fig.
2) from the chassis.
(3)
Use the four housing
screws to mount
the
870A1U upper
housing
to the chassis
and
870ADJ housing. The three parts should be held
tightly together
as the screws are driven.
(4)
Place the two tabs located along the lower
edge of the B1 faceplate in the notches in the
lower side of the 870A1U upper housing.
(5)
Lower the faceplate
to rest on the memory.
The spring clip located in the center of the
upper side of the upper housing should retain the
faceplate.
Page 19
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