User manual

95.08.23.11.30
Color LaserWriter 12/600 PS Basics & Theory 1–97
Cassette Pickup Board
The cassette pickup board carries out serial communication with the
mechanical controller to control the pickup operation.
IC301 Controls communications with the mechanical controller and the opera-
tion of the cassette pickup board.
IC302 Controls the operation of the pickup motor.
PS301 Cassette paper sensor. When there is no paper in the cassette, the
cassette paper sensor signal (
CPSNS) goes “H.”
PS302 Registration paper sensor. This sensor is located on the feed side of the
registration roller. When paper is detected, the registration paper sensor
signal (
REGSNS) goes “L.”
PS2 Manual feed paper-width sensor. When paper on the manual feed tray
is B5 or smaller, the manual feed paper size sensor signal (
MPSSNS)
goes “H”; when it is larger than B5, the signal goes “L.”
PS1 Manual feed paper-present sensor. When there is no paper on the
manual feed tray, the manual feed paper sensor signal (
MPPSNS) goes
“H.”
PS303 Paper leading-edge sensor. This sensor is located on the feed side of
the transfer drum. When paper is detected, the paper-top sensor signal
(
TOPREG) goes “H.” For a transparency, the signal remains “H” only
while the white band on its leading edge is being detected. The inten-
sity of light may be changed using the LED power select signal
(
LEDDRV) described on the previous page.
M1 Pickup motor. This is a two-phase stepping motor.
SL1 Cassette feed solenoid. This solenoid controls the transmission of rota-
tional drive from the pickup motor to the cassette pickup roller. When
the cassette feed solenoid drive signal (
/CPFED) goes “L,” the solenoid
is turned on.
SL2 Manual feed solenoid. This solenoid controls the transmission of rota-
tional drive from the pickup motor to the manual feed pickup roller.
When the manual feed solenoid drive signal (
/MPFED) goes “L,” the
solenoid is turned on.
CL3 Registration roller clutch. This clutch controls the transmission of rota-
tional drive from the pickup motor to the registration roller. When the
registration roller clutch drive signal (
/REGFED) goes “L,” the clutch is
engaged.