RJS Inspector D4000 Auto Optic (FIRMWARE version A.06 and Later) - Manual (Page 44)

Appendix A Operator
’s Guide
RJS, Minneapolis, MN 002-5564
Note 1:

UPC/EAN tolerances:
80 - 89% = .14X
90 - 115% = .30X
116 - 150% = .34X
151 - 200% = .38X

UPC-A symbols with a number system character value of 2 and
EAN-13 symbols with a prefix of 20 contain a random weight check
digit in addition to the normal Mod 10 check digit. This extra digit is
automatically analyzed and displayed in the Mod Check Data
Analysis screen as shown below:
Modck: 1 5 PASS
Expect: 1 5
Note:
The 1 is the random weight check digit and the 5 is the
Mod 10 check digit. The symbology specifications allow
the check digit to have a value of zero in cases where it is
not used
In cases where the random weight check digit is zero, when another
value is expected, a Bad Mod Check Warning will not be issued.
The LCD display and corresponding printout will note the discrep-
ancy with a
“CHK” message in place of “FAIL” as shown below:
Modck: 0 CHK
Expect: 1