First Paper Feed Control - Minolta Di551 Service Manual

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[3] First Paper Feed Control

The 1st paper feed from tray 3 takes place as the

result of the transmission of the drive force from

M1 (paper feed) to each paper feed roller by MC7

(paper feed MC/3) and MC8 (pre-registration

MC/3). The feed roller picks up paper using its

The above operations are controlled by the

PRCB (printer control board). Related signals

are PS13 (paper feed/3) and PS27 (vertical con-

veyance/3) issued from the vertical conveyance

TRAY 3 PAPER FEED UNIT

1. Operation

Operation of the MC7 (paper feed MC/3)

(1) Start timing of printing of the first copy

MC7 (paper feed MC/3) turns ON at the timing

that is determined by the P counter from when

copying starts, and turns OFF after a lapse of the

specified time from PS13 (paper feed/3) 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 PS13.

(3) OFF timing

When PS13 is turned ON.

Operating of the MC8 (pre-registration MC/3)

(1) ON timing

After a specified time from the MC7 (paper feed

(2) OFF timing

When PS13 (paper feed/3) is turned OFF.

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