Care And Cleaning; Before You Call For Service - Cardinal CN20 Series Technical Manual

ERROR AND STATUS DISPLAYS, Cont.
Display
-oF-
-oL-
CALb
Err
Err1
Err2
Err3
Err4
ErrA
Your CN20 is constructed of high impact resistant polycarbonate and requires no maintenance other
than an occasional cleaning with a soft damp cloth. Never use an abrasive cleaner on the instrument
nor use a pointed object like a pencil point or letter opener to press the keys.
We suggest that regular checks of the calibration be made to insure that a high degree of weighing
accuracy is maintained. Contact your scale service technician for additional information regarding this
service.
The membrane keyboard is not to be operated with pointed objects (pencils, pens,
fingernails, etc). Damage to keyboard resulting from this practice will NOT be covered
under warranty.
The CN20 has been designed to provide you with years of trouble-free operation. In spite of this,
troubles sometimes happen. Before calling for service assistance you should make some initial
checks to verify that a problem does exist. The following describes several types of symptoms along
with suggested remedies.
Problem
Display does not turn on
Incorrect weight displayed
Indicator will not display
weight

CARE AND CLEANING

BEFORE YOU CALL FOR SERVICE

Possible Solutions
Batteries discharged - replace.
Batteries not installed or not installed correctly.
AC power supply not plugged in.
Instrument not calibrated.
Scale platform touching adjacent object.
Refer to Error Display section and make certain
that the UnLd or Lod= messages are not on. If so, and scale is
not loaded, perform the calibration sequence.
Meaning
Attempting to display a negative number
greater than -999 or a positive number greater
than 9,999.
Scale weight exceeds scale capacity.
Indicates improperly stored calibration data;
calibration is necessary.
Indicates a disallowed keyboard entry:
Attempt to zero when the weight is outside the
scale zero range.
Program checksum mismatch.
EEPROM write illegal.
RAM test failure.
EEPROM read failure.
No load cell signal or load cell polarity
reversed.
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