SERIAL NUMBER
DATE OF PURCHASE
PURCHASED FROM
RETAIN THIS INFORMATION FOR FUTURE USE
CN20 Digital Weight
Indicating Instrument
Congratulations on your purchase of a series
CN20 Digital Weight Indicating Instrument. This
instrument, which has been designed and
manufactured in the U.S.A., incorporates the
latest digital technology and includes features
that were unavailable only a short time ago. With
reasonable care your CN20 should provide years
of accurate weight measurements.
The series CN20 is housed in an
injection-molded polycarbonate enclosure and
may be mounted on a scale column or on a wall
or desktop. The instrument is available with
either a red LED display or a high-contrast LCD
display. Although the basic weight indicating
instrument is designed to operate from batteries,
optional plug-in power supplies are available for
115 VAC or 230 VAC.
The CN20 keyboard allows the operator to lock
the weight display as well as review and change
operational parameters including sample rate,
filtering, auto shutoff and sleep mode.
This manual is provided to serve as your guide to
the installation, operation and maintenance of
your new weight indicating instrument. Please
take the time to read this manual before
attempting to install or operate your CN20.
FCC COMPLIANCE STATEMENT
WARNING! This equipment generates, uses and
can radiate radio frequency energy and if not
installed and used in accordance with the
instructions in this manual, may cause
interference to radio communications. It has been
tested and found to comply with the limits for a
Class A computing device pursuant to Subpart J
of Part 15 of FCC Rules, which are designed to
provide reasonable protection against such
interference when operated in a commercial
environment. Operation of this equipment in a
residential area is likely to cause interference in
which case the user, at his own expense, will be
required to take whatever measures may be
required to correct the interference.
You may find the booklet “How to Identify and
Resolve Radio TV Interference Problems” prepared
by the Federal Communications Commission helpful.
It is available from the U.S. Government Printing
Office, Washington, D.C. 20402. Stock No.
001-000-00315-4.
TABLE OF CONTENTS
SPECIFICATIONS .......................................1
INSTALLATION ............................................1
Power Supply .....................................2
Batteries .............................................2
Load Cell Connection.........................3
SETUP AND CALIBRATION ........................3
FINE SPAN ..................................................8
KEYPAD FUNCTIONS .................................8
ANNUNCIATORS .........................................9
SETUP REVIEW ..........................................10
BATTERY CHARGING.................................11
PRINTED CIRCUIT BOARD
JUMPER TABLE ..........................................11
ERROR & STATUS DISPLAY ......................11
CARE AND CLEANING ...............................12
BEFORE YOU CALL FOR
SERVICE ...................................................12
APPENDIX A
Replacement Part ID List ...................13
All rights reserved. Reproduction or use, without express
permission, of editorial or pictorial content, in any manner,
is prohibited. No patent liability is assumed with respect to
the use of the information contained herein. While every
precaution has been taken in the preparation of this book,
we assume no responsibility for errors or omissions.
Neither is any liability assumed for damages resulting from
the use of the information contained herein. All instructions
and diagrams have been checked for accuracy and ease
of application; however, success and safety in working
with tools depend to a great extent upon the individual
accuracy, skill and caution. For this reason, we are not
able to guarantee the result of any procedure contained
herein. Nor can we assume responsibility for damage to
property or injury to persons occasioned from the
procedures. Persons engaging the procedures do so
entirely at their own risk.
PRECAUTIONS
Before using this instrument, read this
manual and pay special attention to all
“WARNING” symbols:
IMPORTANT ELECTRICAL
WARNING
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