Bell System KS-16765 L3 Adjusting Instructions

BELL SYSTEM PRACTICES
AT
&
TCo Standard
SECTION 034-354-701
Issue 4, July 1976
RECORDER
KS-16765 L3
REQUIREMENTS AND ADJUSTING PROCEDURES
1. GENERAL
1.01
This section covers the KS-16765 L3 recorder.
This recorder with its associated KS-16765
L6 amplifier and control facilities is known as the
KS-16765 Ll or L2 announcement set.
1.02
This section is reissued for the following
reasons:
(a) To revise 2.02 and 3.02 to add new lubricating
requirements and to emphasize the importance
of regular lubrication
(b) To revise method of checking bail-stop
position, 2.08.
(c) To revise List of Tools, Gauges, Materials,
and Test Apparatus, 3.001
(d) To make other changes as required.
This reissue does not affect the Equipment Test
List.
1.03
Two different designs of KS-16765 L3 recorders
are in use in the field. The earlier- and
the later-type recorders consist of a motor-belt
driven drum on the surface of which is mounted a
synthetic rubber recording band 1-27 /32 inches wide.
A single magnetic head is provided for recording
n
message on the recording band and reproducing
.1t. As the drum rotates, the magnetic head is
moved across the surface of the recording band
by the operation of a feed screw mechanism.
Announcements of up to 2 minutes duration may
be recorded. Announcements are erased from the
band by energizing an erase coil by means of the
control circuit. On the later-type recorder,
announcements of up to 3 minutes duration may
be recorded by replacing the 2-minute pulley with
a 3-minute pulley.
1.04
The circuit of the KS-16765 L2 announcement
set is covered by SD-95283-01 and the circuit
of the KS-16765 Ll announcement set is covered
by SD-95286-01.
1.05
Reference shall be made to Section 020-010-711
covering general requirements and definitions
for additional information necessary for the proper
application of the requirements listed in this section.
1.06
The cover should be kept on the announcement
set at all times except when it is necessary
to remove it for maintenance reasons.
1.07
Number Symbol
(#):
Requirements are
marked with a number symbol when they
are not required to be checked before turnover.
1.08
Asterisk
(*):
Requirements are marked
with an asterisk when to check for them
would necessitate dismantling or dismounting of
apparatus, would affect the adjustment involved,
or would affect other adjustments. No check is
made for these requirements unless the apparatus
or part is made accessible for other reasons, or
its performance indicates that such a check is
advisable.
1.09
Make Busy: Before performing any work
on a recorder, the equipment is removed
from service in accordance with local instructions.
The equipment is not removed while running unless
it runs continuously indicating a trouble condition.
When it is removed, a new unit is substituted
immediately.
1.10
Bail Assembly in Operated Position:
The bail assembly is in the operated position,
for the purpose of this section, when the carriage
half nut fully engages the feed screw with Ll
solenoid electrically operated.
NOTICE
Not for use or disclosure outside the
Bell System except under written agreement
Printed in U.S.A. Page 1