Marantz-2250B-rec-sm维修电路原理图.pdf

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1、RadioFans.CN 收音机爱好者资料库 3.AM ALIGNMENTPROCEDURE( 3.1AMIF Alignment() 1. Connect a sweep generator to the J 153 and an alignment scope to the test point B. 2. Rotate each core of IF transformerL153 formaximum height and flat top symmetrical response. 3.2AMFrequency Rangeand Tracking Alignment 1. Set

2、AM signal generator to 515 kHz. Turn the tuning capacitor fully closed (place the tuning pointerat the low end) and adjust the oscillatorcoilL152 for maximum audio output. 2. Set the signal generator to 1650 kHz. Placethe tuning pointer in the high frequency end and adjust the oscillator trimmer on

3、the oscillatortuning capacitor for maximum audio output. 3.Repeat steps 1 and 2 until no further adjustment is necessary. 4. Set the generator to 600 kHz and tune the receiver to the same frequency anq adjust a slug core of AM ferrite rod antenna and RF coil L151 for maximum output. 5. Set the gener

4、ator to 1400 kHz and tune the receiver to the samefrequency and adjust both trimmingcapacitors of antenna and RF tuned circuit for maximum output. 6. Repeat steps 4 and 5 until no further adjustment is necessary. Note:During tracking alignment reduce the signal generator outputas necessaryto avoid A

5、GC action. 3.3AM Signal Strength Meter Alignment Set an AMsignal generator to1000 kHz at 5k1-N, and adjust R178 so that the signal strength meter may read 90% of the full scale. , 1 3 4.FM ALIGNMENTPROCEDURE 1. ,Connect an FM signal generator to the FM ANTENNAterminals and an oscilloscope and an aud

6、io distortionanalyzer to the TAPE OUTPUT jacks on the rear panel. 2. Set the FM SG to 87 MHz and provide about 3 to 5J.1.V. Placethe tuning pointer at the low frequencyend by rotating the tuning knob and adjust the core of oscillator coil L104 to obtain maximum audio output. 3. Set the FM SG to 109

7、MHz and provide about 3 to 5J.1.V output.Rotate the tuning knob and place the tuning pointer at the high frequency end and adjust the trimming capacitor C106 for maximum output. 4.Repeat steps 2 and 3 until no further adjustment is necessary. 5. Set the FM SG to 90 MHz and tune the receiver to the s

8、ame frequency. Decreasesignal generatoroutputuntilthe audio outputlevel decreases withthe decreasing generator output.Adjust the antenna coil L101, RF coils L102 and L103 and IF transformer L105 for minimum audio distortion. 6. Set the FM SG to 106 MHz and tune the receiver to the same frequency. Ad

9、just the trim- ming capacitor C102, C104 and C105 for minimum distortion. 7. Repeat steps 5 and 6 until no further adjustment is necessary. 8. Adjust the secondary core (upper) of discriminatortransformerL201 sothat the center tun- ing meter pointerindicates its center at no signal applied. Set the

10、FM SG to 98 MHz and increase its output level I kJ.l.V and tune the receiver to the samefrequency sothat the center tuning meter pointer indicates its center. Adjust the primary core (lower) of L201 for minimum distortion. 9. Set the FM SG to 98 MHz at 1000 kJ.l.V,and adjust R374 so that the signal

11、strength meter may read 90% ofthefull scale. RadioFans.CN 收音机爱好者资料库 5.STEREO SEPARATIONALIGNMENT 1. Set the FM SG to provide I kj.LVat 98 MHz. Tune the receiver to the samefrequency sothat the center tuning meter pointer indicates its center. 2. Turn the FM SG modulationoff(withthe pilotsignal turn

12、ed off), connect a frequency counter to test point J310, and adjust R311 so that the frequency counter may precisely read 19 kHz. 3. Modulate the FM SG with stereo composite signal consisting only of subchannel signal (of course a pilot signal must be included). 4. Adjust the trimmingresistor R301 f

13、or maximumand same separation in both channels. 6.MUTINGCIRCUITALIGNMENT 1. Connect a VTVMacross the resistor R363 and adjust the resistor R363 untilthe meter reads0.75V DC at no signal. 2. Set the FM SG to provide I kJ1Vat 98 MHz and tune the receiver to the same frequency correctly. 3. Turn on MUT

14、I NG push switch. Shift the FM signal generator frequency to plus and minus and note both plus and minus shifted frequencies at which undesirable audio side responses are muted out. Adjust the R363 so that the same shifted frequencies mute the undesirable side response. 4. Adjust R362 for proper fre

15、quency shift at which the muting circuit operates. 7.DOLBYFM TAPE OUTPUT SETTING 1. Set the modulation of FM SG to 400 Hz, 50% (37.5 kHz Dev.) 2. Set the FM SG to provide 1 kJ1Vat 98 MHz. Tune the receiver to the same frequency so that the center tuning meter pointer indicates its center. 3. Turn on

16、 DOLBY FM push switch. Set the semifixed resistors RC01 and RC02 so that the output of the TAPE OUTPUT terminals Rand L become 580 mVat VTVM. 8.AUDIOADJUSTMENT 1. Voltage adjustment Connect a DC voltmeterbetween pin terminal804 and 805, and adjust the trimming resistor R806 for 35V DC. 2. Main Ampli

17、fierDC off-setalignment Connect a DC voltmeter with 0.5 or 1 V range between the speakerterminals and adjust the trimmingresistor R707 for zeroDC output on the meter. Repeat the sameprocedure for the other channel. Note:During this alignment no load should be connected to the speakerterminals. 3. Id

18、le-current adjustment Connect a VTVMbetween pin terminals 708 and 710. Next, adjust the trimmingresistor R719 sothe VTVM reads10mV DC. Repeat the sameprocedure for the other channel. 4. Check DC off-set voltage aligned in the procedure 2 and if any DC output is observed on the DC voltmeter, adjust t

19、he R707 again for zero output. 5. Phono-amplifier adjustment Connect an oscilloscope to the TAPEOUT jacks and an audio signal generator to the PHONO jacks. Placethe selector switch in the PHONO position. Increase1 kHz audio signal gradually untila slight clipping on top of the sine-wave is observed

20、on the oscilloscope. Adjust the trimmingresistor R408 for equal clipping level. For the other channel adjust R409. 4 RadioFans.CN 收音机爱好者资料库 : Figure 1. Dial Stringing 5 RadioFans.CN 收音机爱好者资料库 COO3 - J314 J305 II J304.1303J316 306 J205(:r- J:OSJJSP6J210 :.-.J-,- J:;02-h P200 J309 P300 J310 JJ9 TI J

21、317 J318 J320J319 J13J321 J307 J31lI.TP r I r- t- Z 1_ :; I C - I - ;06 J404 )- P400 PHONOJ405 Jl3AMP. tlJ-:- ).;c; JCOe JC;02- )XC- J , JJ J210 ROO - , , , :-J. , : , - , J309 J301J302J31.5 f-I I . P300 J314 - J310 -v D I 7 , (j)-8 SOOI3 Jjp4J-J007 1 JIOOlryJ2O JI05J202 LOO3 - JI60 JI03 - JI6 J58:

22、- PI50 1I JJ02 JlO JI53Jr5r JI01 ;108 JI09 ).,52 r- IPIOO II Itl I - I I r:= I ;.:.- n J Lc I I IU- 0.J- - - !-Ol)r - 406J404- I7 ).,.v.P400 ,j, - PorePHONO J405 I .1) AMP_ J402- I 5001-29 JC08 JC02-.- tl 04 PCOI JCOI - COO JCOJ I I i ,j, r;z 19 I SOOI-4 flU l I FOOl -J,. r-;!RE J027,T1iNdT FOO3t?NC

23、N.YlGNc(: ,J,.J J803 J802 JSOl J804 I J808J807 J809J810i P900 POWER SUPPLY IJ8C16 I T20 _ RTOtJT2r I PTOII tn RT02 .JT22 .u I Q? I STOI-S SOURCE + TAPE T17JTl9 , - - JTI6 ON.2 STOI-3STOO FI + MUTINGMONO 5101-2 ST + .:JNO RadioFans.CN 收音机爱好者资料库 : REMOTE SPEAKER JOJ5 ., SPOKE J( r- -0L -o 1-0 - -0 -

24、- rL rD JOl3 MOOS - J703 J704 J,2.!.8 J714 J705 (), .- J701 J706 L J708 J702 L.:. J71Q ()HOO2 P700 I MAINAMP J711 J712r J713 JOlT J709- ,.- J - ).1713 J705 () - 70J J706 L.J102 J708 P700 I MAIN AMP J710 -L J1l1 J7r4 J1J2 J J703 J704 J709- H006 - oN r:rRHl5 JOIO iSHOl- 2ISHO-3 J027 coo. 1I _-.JI ji I

25、PRE 0lITMAININ r LL L- LOW-FILTERHI-FILTER - 5 PEOI L JY01T JY04lJY05JY06JY07Jl08 LOUDNESS tSHO- - , H-JJt ? JiI , , , , Cl I , I 1 , I I 8 ; !i MOOM002 JYO TJYOI I I 1 I J808 .#)7 J809 J8l0i PYOIFUNCTIONLAMP J022 :;J J021 SOO2 GOO! r-, I I, L-.J I( r-., : For CANAOAo: ICN.YI IIr- C;J J020 FOOl i-:,

26、1Rf J027 I,TONel: FOO3:_.JlGN9: ,j,_l J803 J80I J804 PBOO POWER SUPPLY ; J806 I - Figure 2.Wiring Diagram - RadioFans.CN 收音机爱好者资料库 8 _r_ _._.-000 wz-177 N:l:2.T:l31tT.T05 ril(076319CHI0000312 2SA763(4,l11I1-13 .-:. 2. I-IT30e73e1I02OOO22!HT30904IOHTI073,310HK(:64919AHI(O919A lSC87EIS24722SC94Q25473

27、302S04Ip.Q.2S849P,O,R Figure 3. SchematicDiagram 9 RadioFans.CN 收音机爱好者资料库 . JI04 elZ4 OluF J106 I I FUllI 00 I I 122 QI,F Rl06 ,. RIIO 2 C1l6 OluF -, 03 HT30318 2SC38, , CI19 rwC,F6V III20PF - I Rloa 21K RIO?TIe1l7411(OJF I R/l: I -., CIOII , I I I I03CI03cr09 rOOt(PF , IClIO I roooPF I I IRIOI I61

28、( .- r;o-:;A- IFMFRONT END2S,19YC,. IL,a, I I L J102 Figure 9. FM Front End (P100) Schematic Diagram , Figure 10.FM Front End (PlOD) Component Locations 14 I j -, RadioFans.CN 收音机爱好者资料库 J61 -, I I I I I _.J , HHOO00212 31027 1-413.I 4 HTI04942A 25A494Y,G ;!2 HT313272A 25CI3275,T MII HCIOOO06 jJPC30

29、C L r-P150- IAMTl,NER I I I I ,7 Figure 11.AM Tuner (P150) Schematic Diagram Figure 12. AM Tuner (P150) Component Locations 15 RadioFans.CN 收音机爱好者资料库 e-) I =t:1I I I I Figure 13. FM IF (P200) Schematic Diagram Figure 14. FM IF (P200) ComponentLocations r- I I _-.J r- P200.Uor . lor.HlO_11.28,/IV.11

30、1,11.1111I.1/ 6.11.J10.1 ,.II.n./2e,nl,.to.lJ,111-, IFMIFAMPHT308291C(25C829C)HT3044tB(lSC644S)HDIOOOrOIIN60)H0200110(ISI)HOlOOOOZ(20A90M)I Il)IVH204-206H207U1II4AllllIUloffillOlIhnlIll).;.,vCllOHl,e10,101IJO820IVolI,)lll.v_0. 11021044lIrl J2O,czoe1.nA14rIt.Ill!)It(IHUK/PII t0161,0_.CUttOt,O0.,. 01T

31、.:e ;- IHT313441E 2SCI344E I I JOO P400 LPOP_ J402 I I J403 Figure 19.Phono Amplifier(P400) Schematic Diagram Figure 20.Phono Amplifier(P400) Component locations I; 19 RadioFans.CN 收音机爱好者资料库 no, .)10. J710 J711 H35 0 ;712 C710 .ljoiF J113 IPoe 6.81( 7V 704R705 II(100t.:.J H704 P700 MAIN AMP, R103 O

32、K cro, 133 ,vC102 ;01 I + I_ro,IJ702 r I I I Jro, Figure 21.Main Amplifier (P700) Schematic Diagram G . -F06J:!P8:;oV J:t: J710.1711J1l2. G .!j! G 1!1 , G . . .: Figure 22.Main Amplifier (P700) ComponentLocations 20 RadioFans.CN 收音机爱好者资料库 J002 - JOO .:sIOI JOO J a06 ,. coOov H804 H803 7.01 3cv I I

33、I .1803 r- H808Q8ClHeOI r- -,1044:)v JO!r riV/i ca:cIIat .I , Figure 23.Power Supply (P800) Schematic Diagram Figure 24.Power Supply (P800) ComponentLocations , , 21 RadioFans.CN 收音机爱好者资料库 r W -,CO., (0.I HTI01212A ZSA 121S, T I I I I I I I I II I - Figure 25. Pre Tone Amplifier (PEOn Schematic Dia

34、gram Figure 26. Pre Tone Amplifier (PEOn Componentlocations RadioFans.CN 收音机爱好者资料库 Q-., PHO I.(U._.U, .I.T(.A.(-.;IT1I FILTER.SP. ,.eo.,10(1.1 0-J0.poo,. 1 Figure 27. Filter (PH01) Schematic Diagram RH16 -#N-. RH15 . JH13 JH18 JH12 JH16 0000 SHOl-5 ,: . : lit . Figure 28.Filter (PH01) ComponentLoca

35、tions Figure 29.Monitor (PT01) Schematic Diagram 23 8Hle2-AlU:J Figure 30.Monitor (PT01) ComponentLocations RadioFans.CN 收音机爱好者资料库 ) I: -. JZOg.J-MZ05- - PZOI DIALLAMP ) PYOI FUCTtOJtLAMP r-,Mm ;10-;1;-,;-, l,J,l 7t7tgJ L . ,. ,. ,. ,.,W,.j (IOl.,. _0.u.raI rUCII1 - Figure 31. Dial Lamp (PZ01) Schematic Diagram Figure 32. Dial Lamp (PZ01) ComponentLocations Figure 34.FunctionLamps Assembly (PY01) ComponentLocations Figure 33.FunctionlampsAssembly (PY01) Schematic Diagram - RadioFans.CN 收音机爱好者资料库