Service manual

AMX/AM900 SERVICE MANUAL
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34/AMX/AM900 . R&D, HOBART CHINA 
INDICATOR  TheON/OFFbuttonilluminatesRED.
Rinse Wash Lamp FAULT PROGRAM
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FIL
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FILL1
ThefillvalveY1(RL7)istriggeredandtheimpellerswitchS2doesnotcount(no
impulsesonX14.3).
ResetviainputpulsesonX14.3ormachine"OF".
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Possiblecausewithincomingwater
1. Bad contacts at impeller switch plug (airgap) or
PCB.
2. ImpellerswitchPCBnotcorrectlylocked.
3. Reedswitchinwrongposition.
 Possiblecausewithoutincomingwater
1. Shut‐offvalveisclosed.
2. FillvalveY1defective(wiringandpin).
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3. No
outputsignalfromPCBA1(X7.1/3).
Remedy
1. Checkcontacts,solderplug(airgap)ifnecessary.
2. CheckPCBandlockinplace.
3. Putreedswitchincorrectposition.
Remedy
1. Openshut‐offvalveatsite.
2. Check fill valve via service mode and replace i
f
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necessary.
3. ReplacePCB.
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FIL
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FILL2
Exceededfilltime[C43].
ThefillvalveY1(RL7)andallotheroutputswillbeswitchedoffimmediately.
Resetviamachine"OF".
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Possiblecause
1. Seeabove.
2. Lineflowpressureverylow.
3. Linestrainerclogged.
Remedy
1. Seeabove.
2. Checklineflowpressure.
3. Cleanlinestrainer.
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FIL
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FILL3
Externalfillvalveistriggered,tankleveldoesnotrise.
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Possiblecause
1. Shut‐offvalveisclosed.
2. FillvalveY1defective(wiringandpin).
3. Linestrainerclogged.
Remedy
1. Openshut‐offvalveatsite.
2. Checkfillvalveviaservicemodeandreplaceif
necessary.
3. Cleanlinestrainer
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UL
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OVERFLOW
PROTECTION
Requirement:machine"off"or"on"/hood"open"or"closed"S1.
When[F18]isexceeded,arunningprogramwillbestopped:
‐after5seconds[S37]="1"
‐immediately[S37]="0".
ThedrainpumpRL8willbeswitchedonuntil[F17]is
belowpresetvalue.
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Possiblecause
1. Fill valve is jammed and water is running
permanently.
2. Hosefromairtraptopressuretransmittertank
(B4)isleaky.
3. Notenoughwaterispumpedout.
‐Drainpumpclogged.
‐Kinkeddrainhose.
Remedy
1. ReplacefillvalveY1
2. Draintankmanuallyandreplacehose.
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3. Draintankmanually.
‐Dismantleandcleandrainpumporreplaceif
necessary.
‐Placedrainhosecorrectly.
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ERR
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INTERFACE
Communicationproblem.
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Possiblecause
1. Brokenconnection:Display/MainPCB
2. DefectiveCircuitBoard.
Remedy
1. Checkplugs/cableandconnectcorrectly.
2. ReplacePCB.
12.3OTHERINDICATIONS
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INDICATOR  TheON/OFFbuttonisflashingblue/REDalternately.  
Rinse Wash Lamp FAULT PROGRAM
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NegativePressure
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 Possiblecause
1. Washtankfiltersblocked.
Remedy
1. Removeandflushstrainers.