Canon C70 - Manual (Page 280)

12-6 Maintenance Chapter 12
c
Do not touch the round shaft, guide rail, or ribbon cable. Touching
these parts may adversely affect operation of the unit and /or cause
print quality deterioration.
3. Use a clean, soft, dry, lint-free cloth to remove any ink or paper
debris from the unit’s interior, especially around the platen. Be
careful not to touch the BJ cartridge.
DO NOT TOUCH THE
GUIDE RAIL
DO NOT TOUCH THE
ROUND SHAFT
DO NOT TOUCH THE
RIBBON CABLE