McIntosh MA6100 B Reference manual

SERVICEBULLETIN
MA6100
S.B. No.1
MODEL:MA6100Preamp-Amplifier
PURPOSEOFMODIFICATION:Tocorrectwiringerrorincompensation
andtonecontrols.
WHATUNITSAREAFFECTED:SerialNo.AE1001toAE1184
WHENMODIFICATIONSHOULDBEMADE:Anytimeanyotherservice
isperformed.
MclNTOSHMODIFICATIONKITNO.:None
PARTSREQUIRED:None
PROCEDURE:(Refertothediagramonreverseside)
Step1 Removedustcover,knobs& frontpanel.
Step2 Interchangetheorangeandorange/white
wiresconnectedtothetonecontrolPCBoard.
Step3 Interchangethebrownandbrown/white
wiresconnectedtothetonecontrolPCBoard.
Step4 Remove4 screwsfromuppersectionofsub
panelandinterchangethegreenandgreen/white
wiresconnectedtothevolumecontrol(R21O).
Step5 Replaceuppersectionofsubpanelmakingsure
tousethehexheadscrewsinthetopholes
andthepanheadscrewsinthelowerholes.
Replacefrontpanel,knobsanddustcover.
MclntoshLaboratoryIncorporated2 ChambersStreetBinghamton,NewYork13903Phone:AreaCode607-723-3512
WIRINGCHANGE
BE042003

FRONT
OF
UNIT
UPPER
SUB
PANEL
VOLUME
CONTROL
R2IO
TONECONTROL
PC
BOARD
STEP
3
TOP
VIEW
DUST
COVER
REMOVED
STEP
2
BROWN-WHITE
BROWN
ORANGE
ORANGE-WHITE