Quote Originally Posted by teckat View Post
what is to prevent toner from getting in the housing ??
The sensor is further away from the Drum and Devs, therefore less toner gets in. The sensor can't read through a piece of tape caked in toner, but if a small amount reaches the sensor (without the tape), it has more chance of obtaining a reading. Placing a piece of protective tape across the sensor, when the sensor can't read through toner-covered tape, is just one of the many stupid design 'features' Canon incorporated into this disaster of a machine.

what about maintaining a PM sch. ??
I'm not suggesting that removing the tape a substitute for PMs, but it does help prevent E20-0081 errors.

Thankfully, these machines won't be around for much longer. We stopped selling them once it became apparent they were a pile of crap.