Unitech MP300 Trouble Shooting, Chapter 5

To Test the DC Power:

• Disconnect the AC adapter output cable once the battery has charged for

ve minutes.

• Press and hold the feed button, then press and release the on/off button

and then release the feed button. The printer will print a “self test” receipt.

• If the self test receipt is printed, the DC power is ok.

To Test if the Battery is Accepting the Charge:

• Press the on/off button and wait until all LEDs are off.

• Plug the AC adapter output cable into the printer. Press the on/off button;

the green LED is illuminated and after about 20 seconds the LED should turn off.

• If the amber LED is on, this will continue on through this test indicating that

the battery is accepting a charge and that the charge circuit is ok. The LED will turn

off at the end of a 180-minute charge cycle.

Battery and Safety Information

The printer is powered by a 7.4V Li-Ion 2200mAh Battery Pack.

• Charging time in the printer is approximately three hours.

• Take the battery out of the printer during long periods of storage.

• The battery storage temperature is 40°F to 104°F (4°C to 40°C). Do not store a

fully charged battery at temperatures greater than 104°F (40°C) for long periods

of time – the battery may permanently lose charge capacity.

• The recommended temperature for charging is between 68°F (20°C) to 77°F (25°C).

• Be sure to use a fully charged battery before long or battery intensive

printing sessions. Certain operations (for example, printing receipts with a lot of

bar codes and graphics) drain the battery more quickly than others.

• Dispose according to your local regulations. Do not throw in trash.

Caution! Do not disassemble, short circuit, heat above 80°C or incinerate,

because the battery may explode.

Recycling your Batteries

The Rechargeable Battery Recycling Corporation (RBRC) is a non-prot organization

created to promote recycling of rechargeable batteries. For more information about

how to recycle batteries in your area, please visit www.rbrc.org.

Problem Action

Does not feed paper or

has a paper jam

• Remove any jammed supply

• Reload paper supply

Does not print

• Check or replace the printer’s battery

• Make sure the paper supply is loaded correctly,

and not backwards

• Verify communication between the host device and

the printer by disconnecting the communication cable

and performing a printer self-test

Light printing • Check or recharge the battery

• Adjust the print contrast through print application

Voids in printing • Clean the print-head following the cleaning instruction

listed under “Print-Head Cleaning” on page 26

Red (Error) LED on

• Check that the paper supply roll is not out

• Error reading MSR

• The print-head may be hot after extended printing,

and the printer will pause before resuming printing

If the problem is not identied following the above trouble shooting guide, contact

Unitech Technical Support. Support numbers and e-mail addresses are listed on page

3 of this manual.

Other than routine cleaning and other maintenance described on page

26, the printer is not to be personally xed by the user. It must be

returned to an Authorized Service Center. Under no circumstances

should the user attempt to take the printer apart.

Trouble ShootingChapter 5