Savin SDC103A Service Manual download pdf (Page 87)

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1.4.5 Toner End Detection

(1) Toner Near-end Detection

For detecting the toner near-end condition, this machine has two M/A

thresholds (one for Bk toner and one for color toner). For each color, the

machine counts the number of times that the current M/A is smaller than the

threshold for that color. If this condition occurs 5 times consecutively, the

machine detects a toner near-end condition.

(2) Toner End Detection

After the machine determines that a toner near-end condition exists for a

color, the machine enters the toner end condition for that color after 10

copies, then it stops. But other color modes can be used. For example, if the

cyan toner is in an end condition, black and white mode can still be made.

(3) Toner End Recovery

During a toner near-end or end condition, when the main switch is turned

off/on or the front cover is opened and closed (including when toner is

replaced), the toner end recovery procedure is performed.

The toner end recovery procedure is as follows: (Refer also to the flow chart

on the following page.)

1. The machine makes a toner pattern and compares the ID sensor

reading. From this pattern, with a threshold value of M/A (item "1" on the

flow chart), toner is then supplied.

2. Then, the machine makes another toner pattern and reads the ID sensor

output again (item "2" on the flow chart). If this pattern density is good,

the machine cancels the toner near-end/end condition. If it is not, the

machine performs the toner supply routine again.

Rev. 1/97

PROCESS CONTROL

A166/A187/A189 2-18 SM

CÓPIA NÃO CONTROLADA

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