Canon FY8-13EX-000, NP6218 service manual Vi. Identifying Jams, A. Pre-Registration Delay Jam, 5-12

CHAPTER 5 PICK-UP/FEEDING SYSTEM

VI. IDENTIFYING JAMS

As many as six (3 in the cassette feeding unit) are used to monitor the movement of copy paper:

•registration sensor (PS6)

•separation sensor (PS7)

•delivery sensor (PS8)

A jam is identified in terms of the presence/absence of paper at the respective sensors at such times as stored in the microprocessor.

The copier has a mechanism to remember how many copies remain to be made after a jam and the current copy mode; it still retains such information even when it is deprived of power by opening of the front cover.

The microprocessor has the jam detection sequence that is described below and, further, identifies the presence of paper as detected by a sensor at power-on.

When the copier identifies a jam, it immediately stops the ongoing copying operation and cuts off the power to the fixing heater (H1); at the same time, it flashes the Jam indicator on the control panel and flashes also any of the location indicator.

The activation of the jam detection mechanism will not increment the copy count for the copy which has jammed.

A. Pre-Registration Delay Jam

Copy paper does not reach the registration sensor (PS6) within a specific period of time after the pick-up clutch (CL2) has gone on because of feeding problems.

Copy Start key			Jam indicator
	ON		(flashing)
STBY	INTR	SCFW	SCRV	SCFW
Pck-up clutch (CL2)
Jam check	1.5 sec		1.5 sec
	Normal		Error
Registration sensor (PS6)
Main motor (M1)

Figure 5-601 Pre-Registration Delay Jam Sequence

5-12 COPYRIGHT © 1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)