PROBLEM:
Service life of the print head and what are the points to be noted?

ANSWER:
The print head of printers DR215/216/235/236-N is an expendable item!

The service life of the print head is about 300 million strokes per pin.
However, the service life is greatly reduced if, for example,

• the ribbon is repeatedly reused (refilling)
• original manufacturer ribbons are not used
• paper is used that doesn't comply with the paper specifications.

Various steps have been taken to ensure the longest possible service life of the print head. For instance, the printing speed is reduced automatically when the print head reaches a certain temperature. Once it has cooled down again, the printer resumes high-speed printing.
Such high temperatures (the internal print head temperature can rise to over 120°C) occur under extreme printing conditions such as the printing of large black areas over long periods of time. In order to avoid overheating, each spool of the 9 or 24 electromagnets is monitored. If a spool reaches the temperature of 120°C, corresponding to a housing temperature of 80°C, then the printer slows down etc. as described above.