Service manual

AMX/AM900 SERVICE MANUAL
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14/AMX/AM900 . R&D, HOBART CHINA 
7.FILLING
7.1AIRGAP
Thereed‐switchS2onthesmallPCB775540‐1isactuatedbytheimpellermagnet.
Theimpellermonitorstheincomingwaterflowbycountingimpulsesandthenrelayingthatinformationbackto
themainPCB.Thecountrateis200impulsesperliter.
1. Waterconsumptioncounter[C77]+
[C78](countedlitersareaddedtobasicvalue"0").
2. Remainingwaterquantitycounterforexternalwatertreatment[C79]+[C80]+[S18](countedlitersare
subtractedfrompresetvalue).Seealsochap.11.3,page32.
MAINTENANCE–TOBECHECKED:
Whetherleakingwaterfromtheairgapoverflow(seefigure
1))entersthewashtankchamber(visual
inspection).Ifso,theleakingwaterquantitymustnotexceed100mlperfillstep.
Whethertheimpellersensorworks.Thiscanbecarriedoutintwoways.
1. ServiceMenu:SelectinputS2andactivatethefillvalvebypushingtheON/OFFbutton
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(‐‐0/‐‐1willbedisplayedalternately).Seealsochap.11.1.2,page28.
2. Visualcheck:quickflashingLEDonmainboard(seepage30).
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NOTE:
Toavoidincrustations,thefillvalveisactivatedduringstand‐byevery20minutesforashorttimetohumidifythe
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nozzlesinsidetheairgap.(Parameter[S45]setto"1".)