LabGruppen ss_1300电路图.pdf

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1、SS1300 LAB1300 SERVICEMANUAL LAB.GRUPPEN Andersson 27VZener0.4 W 1N5404 HS10,diac10V Downloaded from www.M manuals search engine CliplimiterLAB1000/ SS1300/LAB1500 RA, RH,RI 1.5Kohm1% RB ,RC 15Kohm RD270 Kohm RF,RG 27Kohm R2,R3Should beremoved RIOChange to10Kohm1%0.7W CA4 .7uF/50VOBS.OnlyLAB1500 QCB

2、C547 QD,QEBC557 UA VTC5C4(Vactec) SA Switch Downloaded from www.M manuals search engine R10 Downloaded from www.M manuals search engine R?8 lab.gruppen LAB13QQCPOWERAMPLIFIER LEDDISPLAY irw-coai*-* (S3C3C9C3 LAB130QCPOWERAMPLIFIER INPUTBUFFERreplacethetwo47-resistorswithfuses, T6.3A. a)Adjusttherail

3、voltagebyTP2to82.5VonthePSUB. b)CheckthequisentcurrentbymeasuringthecurrentthrutheF2, adjustto 200mAbyPI. c)Checkoutputbyasinewaweuptofullswinginto4Oload. d)Checkofshort-circuitprotection: -Adjustoutputvoltageto10VAC. -Shorttheoutputbyaresistor0.3-0.50/5W. -Checksymetryoftheshortcircuitvoltageacross

4、the0.3D-resistorbythe scope. 9) Serviceindrivercircuits a)DesolderR12,R24andR25. b)Connectaresistor33kQbetweenpointR2/R27 and R12/C3. c)ConnectascopeatR22/R27. d)Applyasinewawetotheamplifier,andthedrivercircuitscanbechecked separatelywithouttheoutputcircuits. 10)CheckofDC-voltages: a)D1+15V ref.toground. b)D2-15V n c)Q3collector-14V d)R4,R5-0.5V it e)R8,R9-1.2Vref.to+Railvoltage. f)R14,R15-0.5V ii g) R16,R17+0.5Vref.to -Railvoltage. Downloaded from www.M manuals search engine