The part number is:
PRINTER DPU20 W/CABLE & SCREWS
The printer is driven and controlled automatically by the control unit, while the autoclave performs a sterilization program.
To set the paper roll in the printer, perform the following steps:
Gently push the clips for removing the front panel, remove the panel and pull out the printer gently.
Set the paper roll on the shaft (See Figure 1). Since the outer and inner surfaces of the paper are different, set the roll so that the printing surface is the outer.
Gently push the paper face down into insertion opening (A) in Figure 2. Keep pressing the feed switch (B) until the paper comes out from the print head (C).
When the paper emerges from the print head, insert it in the paper cutter (the slot in the front panel) and reassemble the front panel on the unit.
The paper roll is set inside the unit, and the printer is ready for use.
NOTE: If the paper is not pulled in by the rollers, even when you press the feed switch (B), push the paper in.
To ensure a reliable operation of the printer, perform the following:
Turn the main switch to the OFF position.
Press the feed switch and at the same time turn the main switch to the ON position. Verify that the printer performs an operation test by printing all the built-in characters.
The following precautions have to be taken to ensure the proper operation of the printer:
Avoid contact between the paper and the hot parts of the autoclave, as the paper will be blackened.
Do not pull out the paper roll from the paper insertion opening.
Use only the 58mm. wide thermal paper rolls, supplied by your dealer. Larger rolls will not fit inside the printer.
The printer prints, but nothing is printed on the paper.
Make sure the paper is mounted in the right way. Only one side of the paper is printable, (see Printer handling above).
The printer does not print.
When the machine is switched on, the printer gives paper feeds all the time.
Make sure the ‘feed button’ on the printer is not stuck.
Printer is not feeding
Try factory reset.
Turn off, hold down on stop button, turn back on. Still hold stop button. You will hear multiple beeps.
Source: Page 53 Operators Manual for 3870E