Controlling The Deck Lifter Motor (M102) - Canon NP6251 Service Manual

2. Controlling the Deck Lifter Motor (M102)

The deck lifter motor control circuit is found on the side deck driver PCB. See Figure
8-111 for its block diagram.
The combination circuit within the figure consists of various logic circuits, and the
deck lifter motor is rotated clockwise/counterclockwise based on combinations of the
deck lifter motor drive signal (DLMON*) and the deck lifter UP signal (DLUP*) from the
copier's DC controller PCB.
If the deck lifter position sensor does not detect the lifter within 50 sec after the deck
lifter UP signal has been generated, the copier's service mode (*1*; 'LIFT') indicates an
alarm. If an alarm is noted, remove the cause, and turn off and on the copier to reset.
Conditions for Moving Up the Lifter
• The deck (compartment) is closed, i.e., the deck OPEN detection signal (DOPD) is
'0'.
• The deck lifter upper limit detection signal (DLUL) is '0' and, further, the deck lifter
position detection signal (DLPD) is '0'.
• The deck lifter motor drive signal (DLMON*) is '0'.
• The deck lifter UP signal (DLUP*) is '0'.
As a result, the lifter starts to move up.
Conditions for Moving Down the Lifter
• The deck (compartment) is open, i.e., the deck OPEN detection signal (DOPD) is
'1'.
• The deck lifter lower limit detection signal (DLLD) is '0' and, further, the deck lifter
position detection signal (DLPD) is '0'.
• The deck lifter motor drive signal (DLMON*) is '0'.
• The deck lifter UP signal (DLUP*) is '1'.
As result, the lifter starts to move down.
COPYRIGHT © 1997 CANON INC. CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 8 PAPER DECK-A1
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