Telpar, Inc. MTP Series Receipt Thermal Printer User Manual
2011 Telpar, Inc. (Rev.20110809)
Page 48
6 Troubleshooting
6.1 General Troubleshooting
Printer does not seem to do anything
Check the following:
Printer is plugged into an active power source with the correct voltage and current ratings
Power supply
– Is it active or switched to the „ON‟ position (if applicable)?
Is the main circuit board getting power? Check the Red 5 Volt Power LED (See Section 6.2
below). If the 5 Volt Power LED is not lit, and an approved external power supply that is known
to be working correctly is being used, then the main circuit board on the printer has probably
failed. Call Telpar Technical support for assistance.
Is the printer‟s print head or Head Up lever in its fully closed position? These printers will not
attempt to print unless the print-head is fully and securely closed.
Is the main circuit board‟s DIPSWITCH, position 1 switch in the “Up” or ON position? If so, slide
the switch to the OFF position and cycle printer power. The printer will not print with this switch
on (flash memory upload mode).
Printer feeds paper and performs a Self Test but does not print from the host (
computer, controller,
etc.
)
Check the following:
Communications Cable
– is the correct type of cable being used, and is it securely connected?
Is the correct printer driver installed on the host (if required)?
Is the printer connected to the same port that was selected when installing the printer driver?
Is the host‟s printer port „Ready‟ or „OFFLINE‟? Is there a conflict with another printer on that
port?
Printer
’s Document Presenter, Cutter and/or Paper Low Status not working as expected /
General unexpected printer operation / Unexpected Printer Error
check the following:
Are the printer‟s DIP Switch‟s on the main circuit board correctly set for your application?
Remember, whenever any DIPSWITCH positions are changed, the power to the printer must be
cycled for the change to take effect.
Is the printer‟s print head or Head Up lever in its fully closed position? These printers will not
attempt to print unless the print-head is fully and securely closed.
Printer is plugged into an active power source with the correct voltage and current ratings.
Sensors are clean (free of paper dust or other unwanted obstructions). Clean sensors by
blowing pressurized air over the sensor face.
Printer presents a blank document (nothing is printed on the ticket) or the printing is too light
check the following:
In case of a blank document: verify that the roll of paper is Thermal Paper (not plain paper) and
that the paper is fed into the printer with the
thermal side up
(this is the most common cause for
receiving a blank document as only one side of a roll of thermal paper is printable typically).
In the case of the print appearing too light: check the setting of the darkness control adjustment
(R35 on the Main Circuit Board
– Print Density). Try rotating the adjustment clockwise to darken
the print. It is recommended that the darkness level be increased to the point that just meets the
desired darkness level under the normal ambient operating conditions for the printer application
–
this will help extend the life of the print head element.
Printer prints gibberish when sending Serial Information to the Printer (apparent random
