Citizen Systems CLP-6401 - Manual (Page 46)

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3.10 Cleaning
Wipe off any foreign matter such as dust, ribbon residue, and adhesive substance
stuck to the thermal head, ribbon guide roller, and platen with a soft cloth soaked
in ethyl alcohol. Periodic cleaning of the thermal print head is essential to
guarantee quality printing and extended print head life.
Do not use solvent such as benzene and thinner that will dissolve the plastic.
Ribbon guide roller
Ribbon guide roller
Thermal head
Platen roller