Symbol Technologies DS 3408 User Manual

3-3

This chapter provides suggested scanner maintenance, troubleshooting, technical specifications, and signal descriptions (pinouts).

Cleaning the scan window is the only maintenance required. A dirty window can affect scanning accuracy.

•

Do not allow abrasive material to touch the window.

•

Remove any dirt particles with a damp cloth.

•

Wipe the window using a tissue moistened with ammonia/water.

•

Do not spray water or other cleaning liquids directly into the window.

The aiming pattern does not appear when pressing 
the trigger.

No power to the digital scanner.

If the configuration requires a power supply, 
re-connect the power supply.

Incorrect host interface cable is used. 

Connect the correct host interface cable. 

Interface/power cables are loose.

Re-connect cables.

Digital scanner is disabled.

For Synapse or IBM 468x mode, enable the digital 
scanner via the host interface. Otherwise, see the 
technical person in charge of scanning.

If using RS-232 Nixdorf B mode, CTS is not asserted. Assert CTS line. 

Aiming pattern is disabled.

Enable the aiming pattern. See 

.

Scanner emits short low/short medium/short high 
beep sequence (power-up beep sequence) more than 
once.

The USB bus may put the digital scanner in a state 
where power to the digital scanner is cycled on and 
off more than once.

Normal during host reset.

Digital scanner emits aiming pattern, but does not 
decode the bar code.

Digital scanner is not programmed for the correct bar 
code type.

Program the digital scanner to read that type of bar 
code. See 

Bar code symbol is unreadable.

Scan test symbols of the same bar code type to 
determine if the bar code is defaced.

The symbol is not completely inside  aiming pattern. Move the symbol completely within the aiming 

pattern.

Digital scanner emits 4 short high beeps during 
decode attempt.

Digital scanner has not completed USB initialization. Wait several seconds and scan again.