Canon LBP1760P, Service Manual

Page: 110 / 394

2. Reversing
When the duplexing unit receives the duplexing unit command from the printer, it turns ON the
duplexing unit solenoid (SL701), moves the face-up deflector and feeds the paper to the duplex-
ing unit. It also rotates the reversing motor (M701) in the reverse direction (CCW) for about 1
second, and feeds the paper remaining in the reversing unit to the duplexing unit pick-up sen-
sor (PS701).
About 0.3 seconds (about 0.5 seconds for 1200dpi print) after the paper reaches the reversed
paper sensor (PS703), the duplexing unit driver rotates the reversing motor in the normal direc-
tion (CW), and feeds the paper to the reversing wait position (where the paper reaches about 0.2
seconds after the leading edge of the paper passes the reversed paper sensor).
If the duplexing unit pick-up sensor (PS701) does not detect the preceding paper, the duplex-
ing unit driver rotates the reversing motor in the reverse direction (CCW) and the duplex feed
motor (M702) in the normal direction (CW) in order to feed the paper to the duplex pick-up wait
position (where the paper reaches about 0.4 seconds after the leading edge of the paper passes
the duplexing unit pick-up sensor) at high speed.
If the PS701 detects the preceding paper, the duplexing unit holds the paper at the duplex-
ing unit pick-up wait position until the preceding paper passes the sensor.
• Reversing timing
Figure 2-9-4
2 - 72
CHAPTER 2
About 0.4
Duplexing unit command
Duplexing unit solenoid (SL701)
Reversed paper sensor (PS703)
Duplexing unit pick-up sensor (PS701)
Reversing motor (M701)
Duplex feed motor (M702)
(Unit: second)
Duplex feed
About 1
CCW
About 0.3
CW
About 0.2
About 0.1
CCW
CW
Duplexing unit pick-up wait position Reversing position