Motorola Symbol MT2070 User Manual page 486

15 - 4 Symbol MT2070/MT2090 User Guide
Troubleshooting the MT20X0 (Continued)
Table 15-1
Problem
Device emits aiming pattern, but
does not decode the bar code.
Battery Charging
Device does not boot when a
USB cable is attached.
Device is attached to a host PC
via USB cable; PC register
boots up after being powered
down for an extended period of
time; device does not boot.
Beeping Sequences
Device emits short low/short
medium/short high beep
sequence (power-up beep
sequence) more than once.
Device emits 4 short high beeps
during decode attempt.
Device emits high/high/high/low
beeps when not in use.
Device emits low/high beeps
during programming.
Device emits low/high/low/high
beeps during programming.
Device emits a power-up beep
after changing USB host type.
Possible Causes
Device is not programmed for the
correct bar code type.
Bar code symbol is unreadable.
The symbol is not completely inside
aiming pattern.
Scan window may be dirty.
The device's battery is discharged.
When the host is powered down, the
device remains powered from its
battery. This can result in a completely
discharged battery.
The USB bus may put the device in a
state where power to the device is
cycled on and off more than once.
Device has not completed USB
initialization.
RS-232 receive error.
Input error or Cancel bar code was
scanned.
Out of ADF parameter storage space.
The USB bus re-established power to
the device.
Possible Solutions
Program the device to read that type of
bar code. See Chapter 12,
Symbologies.
Scan test symbols of the same bar
code type to determine if the bar code
is defaced.
Move the symbol completely within the
aiming pattern.
Clean the scan window.
See Maintenance on page
Normal behavior if the battery is
severely discharged. The battery must
charge at a reduced charge rate until
the battery acquires sufficient charge to
boot the device. This can take up to 2
hours, depending on the level of battery
discharge.
See above.
Normal during host reset.
Wait several seconds and scan again.
Normal during host reset. Otherwise,
set the device's RS-232 parity to match
the host setting.
Scan the correct numeric bar codes
within range for the parameter
programmed.
Erase all rules and re-program with
shorter rules.
Normal when changing USB host type.
15-1.