AT&T Bell System Plant Series Maintenance Manual

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BELL SYSTEM PRACTICES
Plant Series
SECTION 006-115-800
Issue 3, February, 1966
AT&TCo Standard
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KS-16835 L 1 AND DUKANE MODEL 576-70 I . "()
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MAINTENANCE AND REPLACEMENT OF PARTS·
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MICROFILM SYSTEMS
1. GENERAL
1.01
This section covers information for re-
placement of parts and for cleaning the
KS-16835 L1 Readers, having serial numbers
starting at 1001, and Dukane Corporation model-
576-70 Readers, which are used for reading 35mm-
microfilm mounted in aperture cards. This sec-
tion also lists most parts which may require re-
placement. Instructions are furnished for replac-
ing only those parts which can conveniently be
replaced by the user.
1.02
This section is reissued:
(a) To add the Dukane Model 576-70 reader.
(b) To add information on optical system
cleaning ( 1.04, 2.02, 2.03).
(c) To add piece-part data on the screen.
(d) To add parts data and procedures for
lamp voltage modification.
1.03
The Dukane Corporation model 576-70...,
reader is a commercial version of the
KS-16835 L1 reader. The same card holders,
parts, and accessories are interchangeable be-
tween the two readers.
1.04
Optical System Cleanliness: An accumula-
tion of dust, dirt, or filmy residue on op-
tical surfaces over a period of time will have a
detrimental effect on the sharpness and clarity
of reader images. Screen illumination can be used
to gauge the cleanliness of the optical system.
With no microfilm in the card holder, the screen
illumination, as measured with a General Elec-
tric Company Type 213 light meter or equivalent
held against the center of the screen, should read
12 foot-candles or more. A lower reading indi-
cates the need for cleaning of all optical com-
ponent surfaces. Routine cleaning of all optical
surfaces at 6-month intervals should insure op-
timum reader performance. However, in some .J
areas where dust, dirt, and airborne contamina-...,
tion are more prevalent, shorter cleaning inter-
vals may be necessary. The cleaning procedures
for optical component surfaces are covered in
the following paragraphs.
Note: In cleaning the reader, the sequence
of surfaces cleaned should begin with the
uppermost one and proceed toward the low-
est, to avoid dust cleaned from one surface
settling on another cleaned earlier. If the
components are cleaned in the following se-
quence, the transfer of dust to previously
cleaned surfaces will be minimized.
(1) Screen - 2.03 (1), (2) and (3)
(2) Mirrors- 2.03(5)
(3) Projection lens (upper surface)- 2.03(5)
(4) Projection lens (lower surface) - 2.02(3)
(5) Condenser lenses- 2.02(3)
(6) Lamp- 2.02(4)
Note: A blackened or clouded lamp bulb
indicates that the lamp should be replaced.
(7) Reflector - 2.02 (3)
(8) Card holder - 2.01
2. MAINTENANCE AND REPLACEMENT OF PARTS
2.01
Card-Holder: Remove the card-holder by
pulling it toward the front. Separate the
two card carriers that comprise the card-holder.
Clean the glass flats by wiping with any soft
tissue. If this does not remove all foreign ma-
terial, wipe with tissue which has been moistened
with a small amount of mild soap solution.
Replace the card-holder by pushing it toward the
rear and left until it engages the holding clamps.
Note:
If the glass is chipped or scratched
in such a way that it may scratch the micro-
film, or be unsatisfactory otherwise, a new
card carrier should be obtained. See 3.01.
©American Telephone and Telegraph Company, 1966
Printed in U.S.A.
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