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Figure 2-31 is the end of the print sequence. The printer stops the main motor (Ml) from rotating
when the paper exit sensor turns off after 2.53 seconds.
2.1.2.7 Fan Motor Control
The fan motor (M3) rotates at all times after initialization of the engine has been completed. The fan
motor rotates faster during printing. When printing ends, the fan motor slows down after 15
..
seconds.
. .
If the voltage of pin IC1A44 on the engine controller board (PWB-A) does not exceed 150mV for
1 second, the printer indicates a fan motor malfunction.
2.1.2.8 Power Suppty Circuit Function and Safety Protection
The printer's power supply board (PWB-E) supplies the +5 VDC and +24 WC. The +24 VDC is
used as the bias voltage supply, main motor (Ml) drive, scanner mirror motor (M2) drive, fan
motor (M3) drive, and solenoid drive. For safety protection, the +24 VDC line is cut when the
interlock switch (case open switch) is off.
Rev. A
Paper Exit Senaor Off
Drum
Charge (CH1)
Laser
Development
Figure 2-31. Print Sequence (End)
Fan Motor
Figure 2-32. Fan Motor Speed Control Timing
FAM M.
Figure 2-33. Fan Motor Malfunction Search Timing
Power Supply Board
(lW/B-E)
Figure 2-34. Power Supply Circuit Block Diagram
Main Motor Off
[sec.] y
1.27
1.26
1.0
Interlock
Sw
+24 VW
b
2-15
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