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INSTALLATION-PCB
SECTION 200-096-206
FEBRUARY1991
J2
CRCU (-4 or -8)
\! !
J3
\ P9
P8
ROM (4 each)
Located under CRCU
J4
FlGURE6-3-DTMF RECEIVER UNlT(CRCU)lNSTALLATlON
with PCTU connectors P2, P3, P8, and
P9
(refer to Figure 6-3).
3) Apply firm, even pressure to CRCU to ensure
proper mating of connectors.
3.20 PCTU Installation Procedures
3.21
Install the PCTU in accordance with the fol-
lowing steps:
CAUTION!
Do
not remove plastic insulating shield
from back of PCTU PCB. If shield comes
off, do not allow the back of the PCB to
con tact metal.
1) Remove the PCB from its protective packag-
ing.
2) Set the PCTU
Pl
switch to the ON position
(PCTU,l or 2 only, not on PCTUSl).
3) Set the PCTU P7 battery strap
(BATT)
to the
ON position.
NOTE:
The PCTU is shipped from the factory with the
P7battery strap in the OFFposition. Ensure it
is moved to the ON position when installing
the PCTU to protect customer configuration
information stored in the PCTU RAM.
4) Ensure the PCTU has been configured for the
appropriate hardware options (refer to Para-
graph 3.10).
NOTE:
Ensure the PCTU’s component side is facing
right when installing it in the KSU.
IMPORTANT NOTE:
The power supply must be OFF when in-
stalling the PCTU PCB.
5) Insert the PCTU into slot 00, labeled
PCTU,
and
apply firm, even pressure to ensure proper
mating of connectors:
6) After installing the PCTU, gently pull the PCB
6-5