Microscan MS-615 User Manual page 84

Appendices
Problem Possible Cause
Low read rates
Poor label, range, place-
during read rate
ment, etc.
test (<C>)
Object detector not
positioned properly
End of Read Cycle not
properly defined
Scanner not triggered when
in external mode
Read rate okay
but not getting
any output
Scanner not triggered when
(including
in serial mode
noreads) in trig-
gered mode
Label misaligned or reflect-
ing direct laser light
Triggering/timeout out of
sync
Read rate okay
but getting only Object detector or another
noread messages scanner interfering with
in triggered mode reads
Window dirty or obstructed
Previous label
Scanner configured in Con-
read, but subse- tinuous Read 1 Output
quent label will
Scanner in polled mode
not read
Proper trigger levels not
Scanner not
enabled
entering read
cycle in triggered Trigger circuit not correctly
mode wired
(trigger not
working)
Object detector inoperative
A-10
MS-610 Scanner User's Manual
Solution
See "Menus display..." in previous Prob-
lem heading. Do Step 8, "Adjust Other
Scanning Parameters" on page 1-11.
Ensure read cycle is active during the
time the label is in the scan line.
Ensure that the proper End of Read Cycle
is defined in scanner configuration.
Ensure trigger device is operating prop-
erly.
Do Read Rate Test <C>. If it reads suc-
cessfully, the problem is triggering.
Ensure that correct serial trigger charac-
ter 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 the
Operations menu structure on page 2-11.)
Remedy by remounting, eliminating
interference, or shielding.
Many object detectors emit pulsed infra-
red signals that can seriously degrade
the read rate if they shine into the scan-
ner 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 the one being read.
Check communications protocol.
Ensure that the trigger pulse and the trig-
ger polarity settings are correct.
Ensure that the trigger circuit wiring
meets the scanner requirements.
(See"Attach Cabling" on page 1-6.)
Check detector range and sensitivity.
Try a detector that is known to be good.