Ricoh SP 200 Specifications download pdf (Page 60)

There is no toner end sensor in this machine. Instead, toner end/near-end is

detected using the TD sensor output data.

The machine checks for toner near end/end every copy. If toner near-end or

toner end is detected during the copy job, it is also checked after finishing the

copy job. To detect toner near end, the machine first decides the toner end

reference voltage (V

) based on the TD sensor initial setting and the

humudity sensor output. Then, the machine compares V

with the TD

sensor output voltage (V

): this is point 1 on the flow chart.

During a copy job:

If V

is greater than V

TREF

(this means the amount of toner in the

development unit is low), the machine supplies toner (see Toner Supply).

If toner concentration is still low after 30 copies (point 2 on the flow chart), the

machine checks for a toner near end condition (if V

is greater than V

there is a near end condition).

If toner concentration is still low 50 copies after toner near-end was

determined (point 3 on the flow chart), the machine detects a toner end

condition.

After a copy job:

When the machine detects that toner concentration is low, after the copy job

is finished, the machine decreases V

by 0.2 V and compares the new V

with V

("4" on the flow chart). If the toner concentration is still low, the

machine supplies toner. The machine then compares V

with V

again, and

supplies toner again if V

is too low.

If the toner concentration is still too low after supplying toner 15 times ("5" on

the flow chart), the machine detects a toner near-end condition.

If toner concentration is still low 50 copies after toner near-end was

determined ("3" on the flow chart), the machine detects a toner end condition.

The number of copies between toner near-end and toner end can be

changed with SP 2-213. The default is 50.

- Toner End Recovery -

If the front cover is opened and closed for more 10 seconds while a toner

near-end/end condition exists and the toner bottle is replaced, the machine

will attempt to recover for 3 minutes using the same procedure as for toner

near-end/end detection after a copy job.

1 August 1996 PCU (PHOTOCONDUCTOR UNIT)

2-41

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Ricoh SP 200 Specifications Page 60

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