Panasonic FA-DS72 / FA-DS82 / FA-MA301 Service Manual ▷ View online
1-3
Introduction
1.4 Component location
Upper drive gear
Paper pass sensor
Pick up roller
Across section at the center
Paper feed
motor
motor
Paper pass
sensor (lower)
sensor (lower)
Paper feed
solenoid (lower)
solenoid (lower)
Paper pass
sensor (middle)
sensor (middle)
Lift motor (lower)
SV003
Lift motor
(middle)
(middle)
Paper pass
sensor (upper)
sensor (upper)
Paper feed
solenoid (upper)
solenoid (upper)
Lift motor
(upper)
Paper feed
clutch (upper)
Paper feed door
OPEN/CLOSE sensor
(upper)
Paper feed
clutch (upper)
Paper feed door
OPEN/CLOSE sensor
Paper feed
clutch (middle)
Paper feed
solenoid (middle)
Paper feed clutch
(lower)
clutch (middle)
Paper feed
solenoid (middle)
Paper feed clutch
(lower)
Paper upper limit sensor
Middle roller
Paper
feed motor
feed motor
Paper detecting
sensor
sensor
Paper feed roller
Paper detecting
sensor (upper)
Paper upper limit
sensor (upper)
Paper detecting
sensor (middle)
sensor (upper)
Paper upper limit
sensor (upper)
Paper detecting
sensor (middle)
Paper upper limit
sensor (middle)
sensor (middle)
Paper upper limit
sensor (lower)
sensor (lower)
Paper detecting
sensor (lower)
sensor (lower)
Lower drive gear
Paper level
sensor (upper)
sensor (upper)
Middle drive gear
DFP roller
Paper level
sensor (middle)
sensor (middle)
SV001
2-1
Mechanical
components
2. Mechanical components
2.1 Drive mechanism of paper feed system
• The paper feed system can have up to 3 stages of paper drawers installed.
Each paper drawer is driven by a paper feed unit, and each paper feed unit is
driven by the paper feed motor which is installed in the stand.
• The rotation of the paper feed motor is transmitted to upper, middle, and lower
drive gear by gear, paper feed system clutch, and transmission belt.
• The middle roller gear of the paper feed unit is connected to the drive gear of
paper feed system. The rotation of the paper feed motor is transmitted to the
middle roller of the paper feed unit by the gear on the middle roller.
• When the paper in the paper drawer is 50 sheets or less, the paper level sensor
detects a low paper condition.
2-2
2.2 Operation of the paper feed unit
1) Structure of paper feed unit
Please refer to the paper feed section in the basic version of main body service
manual of the copy machine.
2) Operation of paper feed unit
• When the "Print" key is pressed, and the paper feed motor of system console
rotates, the drive gear of the paper feed unit is driven by a drive gear, paper feed
system clutch, and drive belt.
The drive gear is connected to the middle roller gear in the paper feed unit, so the
middle roller gear is also driven at this time.
• Next, the paper feed clutch turns on, after paper feed solenoid turns on and the
pick up roller is pressed onto the paper in drawer. The pick up roller and paper
feed roller rotate and the paper in the drawer is driven to the middle roller.
• If paper is double fed, the bottom sheet is returned by the paper drawer double
feed prevention (DFP) roller.
• Paper pass sensor confirms the movement of paper from drawer.
When the paper pass sensor does not confirm the paper arrival after a
predetermined time, "paper jam" location indicator turns on.
Through the above operation, paper, which is transmitted to the middle roller, is
fed to the main body of the copy machine.
SV005
Paper feed unit
Middle roller
Paper pass sensor
Middle roller gear
Paper feed roller
DFP roller
Pick up roller
Paper feed solenoid
Paper feed clutch
Middle drive
gear
gear
Upper drive
gear
gear
Paper feed system clutch
Paper feed motor
Lower drive gear
Drive operation of Paper feed system
Paper upper limit sensor
Paper detecting sensor
2-3
Mechanical
components
3) Lift mechanism of paper drawer
• When the paper drawer is inserted, the lift lever is engaged with the coupling
which drives the lift lever of the system console.
Then the lift motor rotates, the rotation is transmitted to the lifting lever drive gear
by a gear, and by rotating the lift lever, the bottom plate of the drawer (and paper)
is lifted.
• When the bottom plate of the drawer (paper) is lifted, the paper upper limit sensor
of the paper feed unit turns on and the rotation of the lift motor is stopped. This
way, level of paper can be kept constant.
4) Paper detecting operation
• When the paper drawer contains paper, the paper detecting sensor turns on.
When there is no paper in the drawer, the paper detecting sensor lever drops into
a slot in the bottom plate, the paper detecting sensor turns off and "no paper" is
detected.
• When the paper level becomes low, the "Add Paper" indication turns on and "low
paper level" is detected.
SV006
Lift lever drive gear
Coupling
Pick up roller
Paper upper limit sensor
Paper detecting sensor
5) Paper size setting of paper drawer
Paper size of the paper drawer is programmed by the user on the copier control
panel. Detection of paper size is not performed.
Bottom plate
Paper lever sensor
Lift motor
Lift lever
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