MX-FN21, MX-FN22 (serv.man4). Service Manual - Sharp Copying Equipment Service Manual (repair manual). Page 20

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TECHNICALDESCRIPTIONS>LoadTraySection
TECHNICALDESCRIPTIONS>LoadTraySection
LoadTraySection
Stacktrayoperation
Thismachineisprovidedwiththreepaperexittrays:theuppertray,themiddletray,andthe
lowertrayfromthetop.
Themiddletrayisfixedtothelowersectionoftheuppertray.Theuppertrayandthelower
trayperformliftingoperationsindependently.
The middle tray is provided with the Finisher Paper Delivery Middle Tray Paper Detector
(FNS130). When the middle tray becomes full, the finisher controller PWB notifies the
connectedunitthatthemiddletrayisfull.
The finisher controller PWB switches the drive directions of the Finisher Upper Tray Lift
Motor(FNM105),theFinisherLowerTrayLiftMotor(FNM106)(includedinthemotordriver
PWB)tocontrolup/downmovementoftheuppertrayandthelowertray.
Todetectpresenceofpaperintheuppertrayandthelowertray,theFinisherPaperDelivery
Upper Tray Paper Detector (FNS104) and the Finisher Paper Delivery Lower Tray Paper
Detector(FNS105)areprovided.
The home position of the upper tray is detected by the upper tray paper surface sensor
(FNS118), and the home position of the lower tray is detected by the lower tray paper
surfacesensor(FNS143).
Thehomepositionisthetopsurfaceofpaperwhenpaperisloadedintheuppertray,orthe
positionwherethetrayedgeisdetectedwhennopaperisloadedintheuppertray.
The Finisher Lower Tray Paper Level Detector (FNS143) detects the paper surface when
paperof651sheetsormoreisloadedinthelowertray.
Whenthepowerissupplied,thefinishercontrollerPWBdrivestheFinisherUpperTrayLift
Motor(FNM105)andtheFinisherLowerTrayLiftMotor(FNM106)toreturntheuppertray
andthelowertraytotheirhomepositions.
Ifthetrayisonthehomepositionfromthebeginning,itisshiftedfromthehomepositionand
returnedtothehomepositionagain.Whenbothoftheuppertrayandthelowertrayareon
theirhomepositions,thisoperationisperformedinthesequenceofthelowertrayandthen
theuppertray.Whenthelowertrayisspecifiedbytheconnectedunit,thefinishercontroller
PWBliftsthelowertraysothatitisatthepaperexitport.
When paper is loaded to the tray, the Finisher Upper Tray Lift Motor (FNM105) or the
FinisherLowerTrayLiftMotor(FNM106)isdrivenbythespecifiednumberofpulsestolower
thetray.Then,thetrayreturnstothehomepositionfornextloading.
The upper and the lower limits of the tray are detected by the three area sensors on the
uppertray/lowertrayshiftareasensorPWB.
WhenthefinishercontrollerPWBdetectstheupperlimitorthelowerlimitofthetray,itstops
theFinisherUpperTrayLiftMotor(FNM105)andFinisherLowerTrayLiftMotor(FNM106).It
alsodetectsanoverloadoflarge-sizepaperandmixedpaperbythecombinationofON/OFF
oftheareasensors.
When the Finisher Tray Proximity Switch (FNSW110) is turned ON, the finisher controller
PWBshutsoffsupplyof+24VtotheFinisherUpperTrayLiftMotor(FNM105),stoppingthe
operationofthefinisher.
Finisher Tray
Proximity
Switch
Upper Tray
area sensor PWB
Finisher
Upper Tray
Lift Motor
Finisher Lower Tray
Lift Motor
Rack
Rack
Finisher
Paper Delivery
Lower Tray
Paper Detector
Shielding plate
Lower Tray
area sensor PWB
Finisher Paper
Delivery Upper Tray
Paper Detector
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