Microscan MS-7100 User Manual page 114

Appendices
Problem Possible Cause
Getting low per- Poor label, range, placement,
centage read rates etc.
during read rate
test (<C>) or Cali-
bration Setup (<t>)
Read rate okay but Scanner not triggered when
getting only in external mode.
noread messages
in triggered mode
Scanner not triggered when
in serial mode.
Label misaligned or reflect-
ing direct laser light
Triggering/timeout out of sync
Object detector or another
scanner interfering with reads
Window dirty or obstructed
Previous label Scanner configured in Con-
read, but subse- tinuous Read 1 mode
quent label will not
Scanner in polled mode
read
Scanner not com- LRC disabled
municating in
Improper configuration
polled mode.
Faulty or improper cabling or
ground
A-12
MS-7100/7180 Industrial Scanner User's Manual
Solution
See "Menus display..." problem on page
Do Step 9, "Test and Autocalibrate," on page
1-15 and/or Step 10, "Adjust Other Scanning
Parameters," on page 1-16.
Ensure trigger device is operating properly.
Do Read Rate Test <C>. If it reads success-
fully, the problem is triggering.
Ensure that correct serial trigger character is
entered with start/stop characters (a left angle
bracket < (unless redefined) and a right angle
bracket >).
Ensure the label is not excessively skewed,
tilted, or otherwise disoriented.
Ensure the bar code is in the scan line when it
is supposed to be.
Ensure that the bar code is pitched or skewed
slightly so as to avoid specular reflection.
Review triggering and timing.
(See "Operations Menu," on page 2-12.)
Remedy by remounting, eliminating interfer-
ence, or shielding.
Many object detectors emit pulsed infrared
signals that can seriously degrade the read
rate if they shine into the scanner or onto the
bar code label when it is being read.
Clean or remove obstruction.
Scan a label that contains different data than
that of one being read.
Check communications protocol.
Enable LRC.
Check communications parameters (through
Aux port or by defaulting unit and resetting).
See Step 6, "Attach Cabling," on page 1-8
in particular, "Ground and Shield Consider-
ations," on page A-9 for cabling information, or
if applicable, refer to multidrop manual.
A-11,.
and