Read Panasonic FA-DS72 / FA-DS82 / FA-MA301 Service Manual online
4-1
Electrical
components
4. Electrical components
4.1 Electrical Components Operation
The circuit construction of the electrical components in system console is shown in
the figure.
Here, the upper stage is explained.
• When the paper feed drawer is inserted into the system console, the combination
of low level, and upper limit sensors tell the CPU to switch, the transistor base of
IC602 to 0v. Then, DT602 is turned off. Transistor Q601 is turned on energizing
the lift motor, rotating it.
• When paper reaches the upper limit (by the lift motor), the sensor lever attached
to the paper upper limit detecting sensor is lifted up and actuates the sensor. The
signal from the paper upper limit detecting sensor (LBSN1) goes high and turns
on transistor DT603, turning off transistor Q601, and stopping the lift motor. The
signal is inputted into and read by IC606.
• When copying starts, the paper feed motor and the system console paper feed
roller clutch are turned on. If the upper paper drawer is selected, the upper paper
feed roller clutch is turned on. After the paper feed solenoid is turned on, the
paper in the drawer is sent to the copier by the paper transfer roller and the paper
feed roller.
• When paper reaches the paper pass sensor, the sensor lever detects paper
passing. Photosensors such as the paper detecting sensor output 0v when the
sensor levers are detected by paper passing and 5V when no paper is present.
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