Epson ActionLaser 1600, Service Manual

Page: 83 / 181

Principles of Operation
Fan Motor Control
The fan motor (M3) rotates at all times after engine initialization has been
completed. The fan motor rotates faster during printing. When printing ends, the
fan motor slows down after 15 seconds.
Figure 2-32. Fan Motor Speed Control Timing
If the voltage of pin IC1A-64 on the engine controller board (PWB-A) does not
exceed 150m V for 1 second, the printer indicates a fan motor malfunction.
F i g u r e 2 - 3 3 . F a n M o t o r M a l f u n c t i o n S e a r c h T i m i n g
P o w e r S u p p l y C i r c u i t F u n c t i o n a n d S a f e t y P r o t e c t i o n
The printer’s power supply board (PWB-E) supplies the +5 VDC and +24 VDC.
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.
Figure 2-34. Power Supply Circuit Block Diagram
EPSON ActionLaser 1600 Service Manual
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