I have doubts about the polarity of the printer's power supply connectors.

Consult carefully the user manual for the product in Download area. If the doubts persist, contact the "Client Technical Support" service.

The printer does not carry out the self-test correctly.

Check the voltage level of the power supply source and that it is able to deliver a peak current sufficient to drive the printer correctly during the printing phase.

The printer, when powered and connected to the transmission unit (P.C., operator panel, terminal, etc..) does not print anything.

Check that the printer carries out the autotest: if it does, check the serial or parallel connection cable, referring to the diagrams shown in the printer's user manual (see Download area). If you have a Centronics serial RS232 or parallel interface, as a further check the printer can be connected to a P.C., addressing some alphanumeric characters followed by the character "CR" (carriage return = OD Hex.) to the printer through a simple Basic program.

The printer prints characters which do not correspond to those sent by interface.

If you have a serial interface, check the setting of the communication parameters (baud-rate, no. of data bits, parity, stop bits, Xon-Xoff or RTS-CTS protocols, emulation). In the case of parallel interface, check that all the data lines are connected to the transmission unit. Check also that the unit itself is not preset to operate with an "emulation" not supported by the Custom printer in use.

The printer does not correctly observe the column formation of the print.

Check the number of characters per line (columns) of the printer model in use and check that the transmission unit is not set for a larger number of characters/line (for example 80 columns).

The printer does not work correctly in graphic mode.

Check that the control characters received by the transmission unit to operate in graphic mode are compatible with those operated by the printer. Check also that the transmission unit is not set to operate with a fixed printer model different from the Custom model in use.

The printer does not work correctly after Windows driver installation.

When serial interface, check that both PC side and printer side are set with the same parameters. When parallel interface, check ECP, EPP, NORMAL parameter sets (set NORMAL). Check also that paper roll size parameter and selected printer model are correct during driver installation.

Problems while running printer firmware upgrade when downloading latest release from web site.

When serial interface, check that cable includes all lines. When parallel interface, use a 25 pin-to-pin cable.
N.B.: not all the printers can be upgraded, try if your printer model has the Firmware.

The pre-receipt often jams in the printer installed in the field.

If it is a printer model without a ticket-ejector, check that the pre-receipt is withdrawn only after it has been completely printed and cut. The ideal solution within the scope of the application is to have the ticket fall into a collection bin where it can be easily retrieved by the user. This ensures that during the phase of ticket production, the user cannot in any way prevent it from issuing correctly. Independently of the type of printer used (with or without motor-driven ejector), check that the printer is working in an environment which falls within the environmental limits specified in the product user manual (see Download area). Check that thermal paper you are using has a thikness included in the right range on the product's manual.