Cyrus 8 DAC - SMD COMPONENT REPLACEMENT; Removing SMD resistors and capacitors; Fitting replacement SMD resistors and capacitors; Removing SMD ICs from the PCB

SMDCOMPONENTREPLACEMENT
©CyrusAudioLtdJun2014 6 Cyrus6DAC,Cyrus8DACservicemanualIssue1
 Usetin/silversolderwhichhasalowermeltingpoint.Tin/silversolderpasteorsmallgauge
solder (26SWG) isrecommended. Do notuse solder containingleadwhen servicing these
products.
 Whenusingsolderpasteapressuredispensershouldbeusedtoensurethecorrectamount
ofsolderisappliedtoeachpad.
 Solder paste should not be used with direct heating methods as the solder between
componentpinsmaynotbemelted.
 Ifnecessary,removeexcesssolderpastewithsolderbraid.
RemovingSMDresistorsandcapacitorsfromthePCBwithasolderingiron
1. Fitthesolderingironwithatiplargeenoughtobridgebothendsofthecomponent.
2. Placethesolderingironsothatitsflattipwillheatbothendsofthecomponentatonce.
3. Whenthesoldermelts,removethecomponentwithtweezers.
4. Allow the PCB
to cool for a few minutes, removing any excess solder with desoldering
braid.
FittingreplacementSMDresistorsandcapacitorstothePCBwithasolderingiron

1. Applyalittlefluxtotheconnections.
2. Placethecomponentinposition.
3. Tin the soldering iron, bringthe tip into contact withthe PCBpad andflow solder to the
joint.Avoidbringingthesolderingirontipdirectlyintocontactwiththecomponent.
RemovingSMDICsfromthePCB
1. Using fine tipped side cutters or tweezer cutters, snip all the leads of the device and
removetheICbody.
2. DesoldertheleadsfromthePCBpads.
3. CleanupthePCBwithsolderbraid.
RemovingSMDICswithahotairSMDtool

1. FitasuitablesizetipfortheICbeingremoved.
2. HeattheICevenlyuntilthesoldermelts.
3. RemovetheICwithtweezers.
FittingreplacementICstothePCBwithasolderingiron
1. CheckthatthepinsoftheICarenotdistorted.
2. Usingtweezers,positiontheICoverthefootprint.
3. CheckthatalltheICpinsarecorrectlyalignedwiththepads.
4. Withaveryfinetipsolderingiron,solderinthepinsatthecornersofthe
IC.
5. Re‐checkthealignmentandcorrectifnecessary.
6. WhenthealignmentisOK,soldertheremainingpinsoftheICtothePCB.
