Dmax Control - Minolta Di551 Service Manual

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DEVELOPING UNIT

[5] Dmax Control

Dmax control is performed by TCSB (toner con-

trol sensor board), M2 (drum), M3 (developing),

and so on under the control of PRCB (printer

control board).

1. Operation

The purpose of Dmax control is to adjust the

maximum density to the reference level for each

DRUM JSIG EX

Dmax control

Several latent images are created at the maxi-

mum laser power, images are developed with the

rotational speed of the developing sleeve varied,

then each density is read by the Dmax sensor

(PD1) on TCSB (toner control sensor board).

The developing sleeve speed detected when the

density has reached the reference level is

recorded as the optimum sleeve speed, allowing

developing to be performed at this sleeve speed.

a) When the fixing temperature is lower than

50°C at SW2 (sub power) ON

b) Every 10,000 prints, upon completion of the

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