Metrologic MS2421 User's Guide download pdf (Page 51)

Troubleshooting

The following guide is for reference purposes only. Contact a customer service representative to preserve

the limited warranty terms.

Symptom Possible Cause(s) Solution

All Interfaces

No LED, beep, or

motor spin.

No power is being supplied

to the scanner.

Check the transformer, outlet, and the power strip.

Make sure the power cable is plugged into the

scanner.

During power up the

unit beeps 3 times.

A non-volatile RAM failure.

Contact a customer service representative, if the

unit will not hold the configuration.

During power up the

unit razzes

continuously.

There has been a

diagnostic failure.

Contact a customer service representative, if the

unit will not function.

During power up the

unit razzes once and

the blue LED flashes.

A VLD failure. Contact a customer service representative.

During power up the

unit razzes twice and

blue LED flash.

Scanner motor failure. Contact a customer service representative.

There are multiple

scans upon

presentation of code.

The same symbol timeout

is set to short.

Adjust same symbol timeout for a longer time.

The unit powers up

but does not beep.

The beeper is disabled. Enable the beeper.

No volume is selected. Select a volume.

No tone is selected. Select a tone.

The unit powers up

but does not scan

and/or beep.

The unit is trying to scan a

particular symbology that

is not enabled.

UPC/EAN and Code 128 are enabled by default.

Verify that the type of bar code being read has

been selected.

The unit has been

configured for a character

length lock or a minimum

length and the bar code

being scanned does not

satisfy the configured

criteria.

Verify that the bar code that is being scanned falls

into the criteria.

Typical of Non-UPC/EAN codes. The scanner

defaults to a minimum of 4 character bar code.

The unit scans a bar

code, but locks up

after the first scan

(the blue LED stays

on).

The scanner is configured

to support some form of

host handshaking but is

not receiving the signal.

If the scanner is setup to support ACK/NAK,

RTS/CTS, XON/XOFF, or D/E, verify that the host

cable and host are supporting the handshaking

properly.

The unit scans but

the data transmitted

to the host is

incorrect.

The scanner’s data format

does not match the host

system requirements.

Verify that the scanner’s data format matches that

required by the host. Make sure that the scanner

is connected to the proper host port.

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Metrologic MS2421 User's Guide Page 51

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