AT&T Bell System Plant Series Adjustment Procedure

BELL SYSTEM PRACTICES
Plant Series
SECTION 034-368-701
Issue 1, December 1968
AT
&
TCo Standard
RECORDER
KS-19829
REQUIREMENTS AND ADJUSTING PROCEDURES
1. GENERAL
1.01
This section covers the KS-19829 recorder
used with the Stored Program Control No.
lA for common systems.
1.02
The KS-19829 recorder (Fig. 1) is a magnetic
tape recorder designed specifically for digital
recording (writing and reading) of binary coded
data; this recorder consists of a tape transport
and a control unit. The recorder is available for
use in two versions, identified by list numbers,
differing only in power requirements as specified
below.
(a) For operation from a 208-volt (±10 percent),
single-phase, 60-Hz ac power source, use
the KS-19829 Ll transport and the KS-19829 L2
control unit
(b) For operation from a 117-volt (±10 percent),
single-phase, 60-Hz ac power source, use
the KS-19829 L3 transport and the KS-19829 L4
control unit
The tape transport (Fig. 1 and 2) contains the
tape-drive mechanism and a 9-track read-write
magnetic head assembly; the control unit contains
the control electronics and the de power supplies.
The de voltage, ±12 and ±24 volts, necessary for
the recorder electronics are developed internally.
Both units are mutually dependent and function as
a unit although either can be replaced independently
of the other. Ll and L3 transports as well as L2
and 14 control units are not interchangeable because
of the different operating power requirements.
1.03
The tape transport is designed to handle
1/2-inch wide, 1-1/2 mil thick, polyester base,
magnetic tape on a 10-1/2 inch reel. The supply
reel turntable and reel retainer assembly is arranged
to accept reels with hub and flange configurations
as specified by the United States of America
Standards Institute (USASI). The take-up reel is
fixed and is not designed for removal during normal
operation.
1.04
Provisions are made in the recorder to sense
the presence of beginning-of-tape and
end-of-tape markers on the tape. Use magnetic
recording tape equipped with photoreflective markers
in accordance with USASI requirements.
Caution: Use only fresh, computer-grade
magnetic tape for all uses including initial
tests and adjustments. An inferior grade
of tape can seriously contaminate the
vacuum system and tape path components.
1.05
Section 020-010-711 covers general requirements
and definitions for additional information
necessary for the proper application of the requirements
described in Part 2.
1.06
The requirements in Part 2 are given in
the recommended sequence for a complete
mechanical check of the recorder. Each procedure
in Part 3 is numbered to correspond with the
requirement in Part 2. Reference should be made
to Part 3 when it is necessary to make adjustments.
Warning:· Hazardous voltage is supplied
to
recorder. Unless otherwise specified,
disconnect electrical power to prevent injury
to personnel or damage
to
the equipment.
1.07
Before any adjustment, lubrication, or cleaning
operations are performed, the equipment
must be removed from service in accordance with
local instructions. The recorder must be placed in
the manual control condition if power is required
to perform checking and adjusting operations.
1 .08
Refer to Section 034-368-801 for piece-part
replacement procedures when requirements
in this section cannot be met due to worn, broken,
or otherwise faulty parts.
© American Telephone and Telegraph Company, 1968
Printed in U.S.A.
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