AT&T Bell System KS-19594 Maintenance Manual

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SECTION 512-125-300
Issue 3, October 1971
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KS-19594 DIALER
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MAINTENANCE
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1. GENERAL
1.01
This section is reissued to:
• Change Table A
• Add information for replacing tape cartridge
Changes or additions in the body of the tables will
be indicated by shaded areas.
1.02
Make a visual inspection of the system for
obvious defects such as loose, displaced, or
broken parts, blown fuses or tripped circuit breakers.
1.03
Maintenance of the dialer is limited to
replacement of worn cords and defective
units. Housings may be cleaned by using a damp
KS-2423 cloth.
1.04
Maintenance of associated station equipment
such as telephone sets, bells and buzzers,
dials, is covered in the appropriate sections.
2. MAINTENANCE
~ Disconnect power cord before removing
~ dialer or power supply housings. Power
should remain disconnected when not
required for immediate maintenance
operation.
Note: •Power must be applied to dialer (List
1) when testing dial-in (List 2) unit. Failure
to do so may result in dial-in unit dialing
slow or sticking when low digits are dialed .•
2.01
The more common defects, confirmation
tests, and corrective action to be taken in
maintaining the KS-19594 dialer are listed in Table
A.
KS-19594, List 1 Dialer Unit
2.02
Should the directory tape fail to rotate to a
new number when the selector wheel is
turned or when the tape drive key is operated,
the tape catridge has failed. Remove the tape
cartridge and replace with a new cartridge.
(a)
•Remove
tape
cartridge as follows:
(1) Raise the access cover on the front of
the dialer.
(2) Raise the front end of the dialer.
(3) Press firmly on the release bar which
rests on the top of the tape to cause the
cartridge to snap out of the bottom of the
dialer.
(4) Pull the tape cartridge forward to clear
the hinges.
(b)
To replace new
tape
cartridge:
(1) Raise the front end of the dialer.
(2) Mate the hinge halves on the rear of the
tape cartridges with the hinge halves at
the rear of the opening in the bottom of the
dialer.
(3) Push upward on the tape cartridge to lock
it into place .•
2.03
It is not possible to change tapes from one
cartridge to another in the field. If the
subscriber requests the tape from a faulty cartridge
be returned in a new cartridge, this can be specified
on the order when the cartridge is returned for
repairs. If subscriber requests to keep old tape,
which may be the only record of the telephone
numbers listed, remove the tape by pulling it out
of the cartridge and cutting each end from the
tape spools.
2.04 Should the dialer fail to operate upon pressing
the CALL button, remove the dialer housing
in order to check voltages at the terminals shown
in Fig.
1.
Do not adjust the level of the 18-volt
de supply. If the 18 volts de differs by more than
2 volts from its normal value, the power supply
® American Telephone and Telegraph Company, 1971
Printed in U.S.A.
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