NAD-312-int-sm 电路图 维修手册.pdf

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1、RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 WIRINGDIAGRAM AHVERSIONONLY NEUTRAL ACOUTLET UNSWITCHED ,_ SPEAKER TERMINAL BOARD ooO. o O ACFC694V-Oo? cHS nso, o J4 x- u!O 318 a. J3J2 BLACK BLACK J1 MOUNTEDTO SUBFASCIA POWERSWITCH BOARD WHITEJ457 J452! -s ; FC69y-o o ssase 4

2、l- O2458,+5 st J453J457J45AEW!T SAMTYE FUSE ATTENTION: TIISPUMFl+IDE OEPELHANGEOEMETYP 1721-100-10 IMPEDANCE SWITCHBOARD 8888 238803 00 ln#le I 338 -P-;-506D=f , K57 oe 75 4 o2 $-u o MAY99ICO 7 8 DISASSEMBLYINSTRUCTIONS 1.RemovemachinescrewsM4.0Xx6.0(1to4)fromthesidepanels. Removetappingscrew 3.0 x8

3、.0sfromthebackpanel. RefertoFigureNo.1. FigureNo.1. o FigureNo.2. 2.PullbothsidesoftheTOPCOVERslightlyoutwards,tiltapproximately35and then moveinthedirectionshowninFigureNo.2. 9 ALIGNMENTPROCEDURES IMPORTANT Speakerimpedanceswitchshouldbein8ohmspositionwhileadjustingcentervoltageandidling current.Re

4、setswitchafteradjustmentprocedureis completed.Removeinputsignalandload. A.OUTPUTOFFSETVOLTAGE 1.ConnectaDCmillivoltmetertoLchannelspeakeroutput terminals. 2.Turnunitonand adjustR411for030mVreadingonmeter. 3.Repeatsteps1and2usingRchannelspeakerterminalsandadjustingR412. B.IDLINGCURRENT 1.Removesolder

5、linkbetweenTP401andTP403forleftchannelandbetweenTP402 andTP404forrightchannel,or cutLK1and LK39. 2.ConnectaDCmillivoltmetertoTP401andTP403(across1-ohmresistorat collectorofoutput transistor). 3.AdjustR443for25-35mVreading onmeter. 4.Repeatsteps2and3usingTP402 andTP404 andadjustingR444. 5.Leave poweron foratleast5minutes. C.FINALADJUSTMENT 1.Repeatoutputoffsetvoltage andidlingcurrentadjustments. 2.WHEN FINISHED,REPLACESOLDERLINKBETWEENTPA401ANDTP403,AND BETWEENTP402ANDTP404ORRECONNECTLK1ANDLK39. 10