Sindoh M611 - Manual (Page 212)

Maintenance and Troubleshoot
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9 Reset the drum cartridge counter.
For more information, see the guide accompanying the new drum cartridge
Warning
- If you reset the drum cartridge counter without replacing the drum cartridge, the printer may be dam
aged and contaminated, which is not covered by the warranty.
10 Close the front cover.
Caution
- Check if the MPT is closed when closing the front cover.
If the front cover is closed with the MPT open, it may cause malfunction