Envelope Feeder; Outline - Canon LBP-1760 Service Manual

VIII. ENVELOPE FEEDER
A. Outline
The operation sequences of the envelope feeder are controlled by the envelope feeder driver. A
4-bit microprocessor is used in the envelope feeder driver, which controls the sequences of the
envelope feeder and the serial communication with the engine controller of the printer.
The engine controller outputs the pick-up command to the paper feeder driver at the neces-
sary timing. The envelope feeder driver drives the solenoid in response to the command. The
envelope feeder driver also sends back the status of the envelope feeder to the engine controller.
The printer supplies +24VDC to the envelope feeder.
+3.3V for the ICs based on this +24V.
The flow of input/output signals to/from the envelope feeder driver PCB is as shown below.
J911-3
-2
To printer
-1
J912-3
-2
To printer
-1
PS902
J913-3
Envelope
multiple
feed sensor
Envelope pick-
SL901
up solenoid
J901-1
J901-4
J903-1
-1
-2
J902-1
Figure 2-8-1
The envelope feeder driver generates
Envelope feeder driver PCB
+24VA
-2
/SEL2 Accepts the command when "L."
-3
SOUT
Command input
-5
SIN Status output
-6
SCLK Serial clock
Envelope sensor
+24VA
-3
MF SNS
"L" when the sensor detects multiple
-2
envelopes.
+24VA
-2
ENV SOL Starts envelope pick-up when "L."
CHAPTER 2
PS901
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