Gestetner B147, Service Manual

Page: 474 / 1081

PROCESS CONTROL
B147/B149/B190 6-16 SM
6.2.6 TONER NEAR END/TONER END DETECTION
Introduction
Toner Near End
To determine the toner near end status, the controller considers the following
information:
•
TD sensor [A] in the development unit
•
Operation time counter of the toner attraction pump [B]
•
Memory chip [C] on the toner cartridge
• Toner end sensor [D]
There are two different toner near-end detection procedures (after here, referred to
as “Toner Near End Detection 1” and “Toner Near End Detection 2”). If either of
these detect near end, the machine enters the near-end condition.
Toner End
To determine the toner end status, the controller considers the following
information:
• TD sensor [A] in the development unit
•
Pixel counter
B146D507.WMF
[A]
[C]
[D]
[B]