GMW IPP 144-40 GS Thermal Printer Troubleshooting Guide

1. Print blank or no output at all

Check the paper status: First, observe whether the "ALARM" LED on the front panel is lit, which usually indicates that the paper roll is exhausted or the front cover is not tightly closed. After replacing the paper roll, the LED should turn off.

Check communication status: Confirm if the sending indicator light (TXD) on the upper computer is flashing. Use a multimeter to measure for any data level jumps on the RxD pin (pin 2) of the printer. If there is no signal from the sender, check if the serial port configuration of the upper computer (baud rate, parity check, data bits) is consistent with the printer menu.

Check handshake signal: When the printer buffer (16 kByte) is almost full, the front cover is open, or there is a shortage of paper, the printer will send the XOFF character and pull down the RTS signal. If the upper computer adopts hardware flow control (RTS/CTS), it is necessary to ensure that the RTS signal line is connected correctly (pin 8 corresponds to the upper computer CTS).

2. Blank lines with "no reason" appear

This is a very typical software configuration issue. IPP 144-40 GS supports a maximum of 48 characters per line (standard font). If the text lines sent by the upper computer exceed 48 characters, or there are extra spaces before the line break (CR), the extra parts will be discarded by the printer and may generate additional blank lines. Please check the length of the text sent by the upper computer to ensure that each line does not exceed 48 characters.

3. Menu cannot be printed

If there are no parameters to print after pressing "ENTER", first check if jumper B is short circuited. Secondly, check if the power supply voltage is normal. You can try pressing the "LINE FEED" button to observe if the paper roll is running, in order to determine if the printer is in a crash state. If necessary, press the reset button (102) to reinitialize the printer.

Maintenance and replacement of spare parts

1. Paper roll replacement

Open the front cover, tilt the metal wire rack upwards, and remove the old paper roll.

Insert a new paper roll (80mm wide, maximum outer diameter 40mm, inner diameter 11.5mm), note that the paper roll should rotate clockwise during printing.

Cut the front end of the paper flat and insert it into the bottom of the printer mechanism until the roller automatically rolls in.

Press the "LINE FEED/ENTER" button until the paper is exposed from the cutting edge.

Close the front cover, make sure the buckle is locked, and turn off the "ALARM" light.

2. Key spare parts and accessories

Paper: 80mm wide commercial document grade thermal paper (item number: 49234 86910).

Cable: Siemens PT88 desktop printer (item number: 27866 79461) can be connected through an adapter cable.

Paper Winder (IPP-AW): Used for automatic winding of printing paper. The device must be connected to a protective grounding, and its motor torque has been adjusted by the factory. If the winding force needs to be adjusted, the screw in the side hole can be slightly rotated (clockwise to increase, counterclockwise to decrease).