First Paper Feed Control - Minolta Di551 Service Manual

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[3] First Paper Feed Control

The 1st paper feed from tray 1/2 takes place as

the result of the transmission of the drive force

from M1 (paper feed) to each paper feed roller by

MC3/5 (paper feed MC/1/2) and MC4/6(pre-reg-

istration MC/1/2). The feed roller picks up paper

using its own weight.

The above operations are controlled by the

PRCB (printer control board). Related signals

are PS1/7 (paper feed/1/2) and PS25/26 (verti-

cal conveyance/1/2) issued from the vertical con-

veyance section.

TRAY 1/2 PAPER FEED UNIT

1. Operation

Operation of the MC3/5 (paper feed MC/1/2)

(1) Start timing of printing of the first copy

MC3/5 (paper feed MC/1/2) turns ON at the tim-

ing that is determined by the P counter from

when copying starts, and turns OFF after a lapse

of the specified time from PS1/7 (paper feed/1/7)

turning OFF. Thus, paper skew is corrected by

forming the loop before pre-registration roller.

(2) Start timing of printing of the second copy

When the preceding paper turns OFF PS1/7.

(3) OFF timing

When PS1/7 is turned ON.

Operation of the MC4/6 (pre-registration

(1) ON timing

After a specified time from MC3/5 (paper feed

MC/1/2) turning ON.

(2) OFF timing

When PS1/7 (paper feed/1/2) is turned OFF.

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