Read Sharp MX-FN21 / MX-FN22 (serv.man4) Service Manual online
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Descriptiononmarks
ThefollowingmarksareusedinthisServiceManual.
Mark
Meaning
Mark
Meaning
Indicatesthatconnectorsare
disconnected.
disconnected.
Indicatesthatascrewis
removed.
removed.
Indicatesthatconnectorsare
connected.
connected.
Indicatesthatascrewis
attached.
attached.
Indicatesthatwiresare
disengagedfromacable
guideorwiresaddle.
disengagedfromacable
guideorwiresaddle.
Indicatesthatapawlis
disengaged.
disengaged.
Indicatesthatwiresare
engagedwithacableguideor
wiresaddle.
engagedwithacableguideor
wiresaddle.
Indicatesthatapawlis
engaged.
engaged.
ThedescriptionsonthisServiceManualarebasedonthefollowingprinciples.
1. Each chapter describes the purpose and the role of each function, the relationship
betweentheelectricalsystemandthemechanicalsystem,andtheoperatingtimingof
eachpart.
eachpart.
"
"onthedrawingsindicatesmechanicaldrivetransmission.If
isused
togetherwithasignalname,itindicatesaflowofelectricity.
"Powersupply"ineachchapterindicatesthatthepowerswitchisturnedON,thatthe
frontdoorisclosed,thatthepaperexitdoorisclosed,andthatthepowerissuppliedto
themachine.
frontdoorisclosed,thatthepaperexitdoorisclosed,andthatthepowerissuppliedto
themachine.
2. Inthedescriptionsofthedigitalcircuitsofthismachine,“1”isusedwhenthevoltage
level of a signal is high, and “0” is used when it is low. The voltage value, however,
dependsonthecircuit.
dependsonthecircuit.
ThoughaCPUisusedinthismachine,sincetheinternaloperationcheckoftheCPU
is virtually impossible, the operating descriptions of the CPU are omitted. In addition,
since the printed board is not repaired on the customer side in principle, the circuit
descriptionsoftheprintedboardarelimitedtoroughdescriptionsusingblockdiagrams.
is virtually impossible, the operating descriptions of the CPU are omitted. In addition,
since the printed board is not repaired on the customer side in principle, the circuit
descriptionsoftheprintedboardarelimitedtoroughdescriptionsusingblockdiagrams.
Therefore,thecircuitdescriptionsareprovidedinthefollowingthreekinds:
Descriptions from the sensor to the input section of the circuit board which is
providedwiththecontrolfunctionandthedrivefunction.
Descriptionsfromtheoutputsectionofthecircuitboardwhichisprovidedwiththe
controlfunctionandthedrivefunction.
Descriptionsoftheblockdiagramofeachfunction.
providedwiththecontrolfunctionandthedrivefunction.
Descriptionsfromtheoutputsectionofthecircuitboardwhichisprovidedwiththe
controlfunctionandthedrivefunction.
Descriptionsoftheblockdiagramofeachfunction.
includingthesensorsandtheinputsectionofthecircuitboardwhichisprovidedwith
thecontrolfunctionanddrivefunction.
thecontrolfunctionanddrivefunction.
Some descriptions may be changed according to modifications on the products, and the
information on any change will be informed by Service Information (Technical Information)
occasionally.
To read this Service Manual and Service Information (Technical Information) issued
occasionally for understanding the machine fully and correctly is an advisable way for
obtainingtheskillsandknowledgetomaintaintheproductperformanceforalongertimeand
toperformtroubleshootingefficiently.
information on any change will be informed by Service Information (Technical Information)
occasionally.
To read this Service Manual and Service Information (Technical Information) issued
occasionally for understanding the machine fully and correctly is an advisable way for
obtainingtheskillsandknowledgetomaintaintheproductperformanceforalongertimeand
toperformtroubleshootingefficiently.
There is a portion currently expressed with the illustration of a conventional model in this
manual.
manual.
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