Cleaning
13
GeBE E + F GmbH • www.gebe.net • GeBE Doc.No.: SMAN-E-657-V1.4 Thermal Printer GPT-4672/4673
11 Cleaning
10.2.2 Control black marks
Control black marks must be printed using infrared
absorbing color in the range of 910-950 nm. Optical
density should be a minimum of 1.0.
After the printer received a form feed command, the
ticket will be positioned to the black mark position +
the length set under Param 19.
This also works in case the control mark has passed
the black mark sensor during printing. Therefore, the
control mark can be set at random within Param 19.
See illustration.
„Final Position“ (P19 := 0) is defined by the distance
between print position and black mark sensor.
After larger print efforts, depending on the paper quality and
adverse environmental conditions, it may be necessary to clean
the print head, sensor, and the platen roll, especially, if some
areas are no longer printed properly.
1. Open printer mechanism by slightly pressing metal lever
upwards.
2. Flap downwards paper carrier roller incl. position mark sensor.
The printer mechanism is now open.
3. Blow forcefully into printer mechanism and onto position mark
sensor, in order to remove coarse dust.
4. Use a small brush to clean paper carrier roll, sensor and
tear-off edge from dirt.
5. Soak Q-tip in isopropanol (IPA) and clean the print bar.
Other stubborn debris can also be removed with a Q-tip (IPA).
Never use sharp objects for cleaning. This might cause damage to the
print head.
Do not touch the print head. This might cause damage through
electrostatic charge.
On principle the printer has to be kept dust-free.