Panasonic DP-CL18 Technical Manual page 45

DP-CL18
3.5.18. Automatic Duplex Switchback Solenoid Drive Circuit
This circuit consists of the switchback solenoid drive circuit and short detection circuit. When switching back the paper at the duplex
printing mode, IC14 outputs the high level signal RSVSOL1 (pin165), turning on the transistor Q28. By the transistor Q28, the
transistor Q3 is turned on and +24 V power is supplied to the pickup solenoid. Besides, IC14 outputs the high level ADUSOL signal
(pin175 of IC14). As a result, the pickup solenoid is energized. This moves the paper path switching guide from the normal printing
position to the duplex paper path position. The paper is fed to the auto duplex rollers along the paper path switching guide.
The short detection circuit is for detecting whether the solenoid drive circuit is shorted or not. If this circuit is shorted, the signal
NFAILDR (pin173 of IC14) becomes a low level. IC14 receives this signal, and detects that the solenoid drive circuit is shorted. The
error message "Printer Error 47" is displayed on the LCD display.
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