Pioneer-QX949A-rec-sm2电路图 维修手册.pdf

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1、4,.#H4eqil*ffiil* F=- K t,:t-j a. 1!, ilT - 1 ui* *- gtrg$# ,4 ,r-. q# ffi.sffiffi*eru$ffiffiffiH RadioFans.CN 收音机爱 好者资料库 Glx-g49A CONTENTS 1. 2. 3. 4. 5. 6. SPECIFICATIONS3 5 I FRONT PANEL FACILITIES . CONNECTION DIAGRAM BLOCK DIAGRAM LEVEL DIAGRAM CIRCUIT DESCRIPTIONS 6.1 FM Tuner Section 6.2 AM T

2、uner Section 6.3 CD-4 Demodulator Section 6.4 SO Full Logic/RM Decoder Section 6.5 Control Amplifier 6.6 Power Amplifier Section 6.7 Protection Circuit DISASSEMBLY 7.1 Wooden Gabinet 7.2 Bottom Plate . 7.3 Front Panel . ADJUSTMENTS 8.1 AM Section 8.2 FM Section 9.3 FM MPX SectionC 8.4 Power Amplifie

3、r Section DIAL CORD STRINGING PARTS LOCATIONS 10.1 Front View 1 1O.2 Front View 2 10.3 TopView . 37 10.4 Bottom View. 39 10.5 Rear View 41 11. EXPLODED VIEWS 43 12. PACKING 52 13. SCHEMATIC DIAGRAMS, P.C. BOARD PATTERNS AND PARTS LISTS 13.1 Schematic Diagrams and Miscellaneous Parts . 53 13.2 TunerA

4、ssembly(AwE-041) . 61 11 13 7. 8. 14 14 16 20 23 24 24 26 26 27 28 29 30 31 32 33 35 9. 10. RadioFans.CN 收音机爱 好者资料库 13.3 Headphone Jack Assembly (AWX-054) . . G7 13.4 Power Supply Circuit B Assembly (AWR-039) 68 13.5 CD-4Assembly(AWM-076) . 69 13.6 SO/RM Decoder Assembly (AWM-077) 77 13.7 Protection

5、CircuitAssembly (AWM-079) . 83 13.8 Control Amplifier Assembly (AWG-023) 86 13.9 Power Supply Circuit A Assembly (AWR-080) 91 13.10 SwitchCircuitAssembly (AWS-048) . 94 13.11 Power Amplifier Assembly (AWH-027) gB 14. PARTS LIST OF EXPLODED VIEWS . . . . . .102 NOTE: THE MODEL QX-949A COMES IN TWO VE

6、RSIONS DISTINGUISHED AS FOLLOWS: Round label on rear panel VoltageType F KCU 110V, -20V,130V,220V, and 240V (switchable) 120V only General export model UL (U.S.A.) and CSA(Canada) approved RadioFans.CN 收音机爱 好者资料库 ABOUT 2CH POWER BOOSTING SWITCH To increase available power when using the QX-949A for

7、2-channel reproduction, a convenient power select fea- ture is incorporated. The covered compartment on the rear panel houses a reversable connector panel. When added power is desired during 2-channel operation tum off set power. Open the cover, remove the connector panel and rotate it 180o, then re

8、-insert it and close the cover. Be sure to reverse the connector again before retuming to 4-channel operation. These illustrations show how the boosting switch is employed. :1 J Pull out connectorRotate connector 180 and re-insert it Loosen screw to open cover CHANGING LINE VOLTAGE SETTING AND FUSE

9、(F MODEL) To remove the fuse, unscrew the fuse cap located in the center of the line voltage selector and withdraw it, together with the fuse. Next, pull the line voltage selector plug out of its socket, rotate it until the cutaway aligns with the appropriate line voltage marked on the back of the u

10、nit, then push it back into its socket. It is important to check the rating of the fuse; a 3A fuse should be used with either 220Y or 240V, while a 6.4 fuse should be used for 110V, 720V, or 130V operation. If the fuse rating is correct, reinsert it and screw in the fuse cap. No selector plug is pro

11、vided for KCU type (120V only model). PHTLLTPS #-qF a l x./ LECTOR PLUG Glx-sl4slA 5. LEVEL DIAGRAM 1T rl ttlll tlr -i tigmy -1 . 20ll Power boosting switch is set at 40ll .trequency at lkllz c a oe o o 13 6. CIRCUIT DESCRIPTIONS 6.1 FM TUNER SECTION Front End This consists of. a 4-gang variable cap

12、acitor tuning circuit, dual-gate MOS FET RF amplifier and mixer, and local oscillator with buffer. By employ- ing a glounded gate-Z of the dual-gate MOS FpT, the circuit becomes equivalent to a cascade ampli- fier, providing large gain with stable operation in the RF amplifier. In the mixer stage, t

13、he signal is applied from the local oscillator to gate-2. This method allows input power from the local oscillator to be minimized and features low mutual interference. A variation of a Clapp circuit forms the local oscillator and by inserting a buffer amplifier between it and the mixer, the oscilla

14、tor load is reduced and waveform distortion suppressed. The oscillation frequency drawing effect is also eliminated, to provide extremely stable operation even with strong inputs. lF Amplifier and Detector These are composed of three dual-element ceramic filters and two integrated circuits. The firs

15、t stage IC (HA1201) incorporates a current limiter, while the second stage IC (HA1137) is shown in Fig. 2. When pin 12 of HA1137 is at more than xTOkHz detuning and with an extremely low input level, 2Cil TAPI Rtc PB 4Cll-it PX OWPUI lux g_- a DC voltage is produced. By setting the FM Muting switch

16、to ON, pin 12 is connected to pin 5, and the analog switch in HA1137 is operated ON-OFF to perform muting. Multiplex Decoder Demodulation is performed by switching detection with the circuit contained in the IC (HA1156), depicted in Fig. 3. A phase locked loop (PLL) produces a 38kHz square wave sync

17、hronized to the pilot signal. The two gates are alternately switched ON-OFF by this signal to derive the L and R channels from the composite signal. By detecting the pilot signal level, the switching signal from PLL to demodulator is operated ON-OFF. The STEREO indicator lights at the same time. 6.2

18、 AM TUNER SECTION This consists of a 3-gang variable capacitor tuning circuit, a dual element ceramic filter and an IC (HA1138). The IC (Fig. 4) contains an RF stage and two IF amplifier stages. OOI.BY ilR AOAPIOR ootJT tOtX Power ampliier (B) YOLUilt SPIATRS -Q-: ClI -$: 8ili - !-: CHa Pll0t0 Pll0t

19、0 cllr 3il1 CM PB RTC PB ffic cltz PB ffic P8 Rtc cMl 7 OllT It 4 q PH0il0 Plr0il0 AUX Pltoilts I rnoti N ffAR 4channel level indicator PB REC PB Rtc Y* .rai 40ll TAPT PB - trce, PB I REc Qi I t c0tTR0t =x- r ror., I o70?Rr tt .- I o.ion, 0. 707 I Rt I t nl F-RB o. IoTRr l o 7o7t B 4 o.lolnt , I Rr

20、0.707t 0 t-_*_ 0. 107R s 0. 7071 s eo Fis. 13 Circuit Composition Three ICs are employed, as shown in Fig. lb. M5165LP is an SQ basic decoder and can function rs an SQ decoder without independent logic. Although a phase shift network is not included, by a CR network, this IC perform to shift the pha

21、se 90 with cover wide range. A selector switch also permits the IC to be used as an RM decoder. During RM, a blend resistor is added at the front, while the rear is blended internally by the IC and taken from separate terminals. CX.049 is a high density full logic IC incorporating both wave matching

22、 and front back logic. CX-718D is a gain control IC and contains four MOS FETs to form a variable resistance voltage control circuit. Since these MOS FETs are P channel enhancement types, equivalent internal resistance becomes in- finite when gate voltage is zero. By applying a negative voltage to t

23、he gate (Fig.!4), the equivalent internal resistance can be varied from infinity to several hundred ohms. r- -_J Basic decoder GIX-g4slA 2SK40V (FET) is employed for back blending. With a CF sound source, it functions to cancel the mutually opposite crosstalk phase to LB and RB. This is an N channel

24、 depletion type junction FET and when the gate voltage is zero) the channel is already established. LB and RB become normally blended for this reason, and the gate becomes open only in the case of a single signal from LB or RB. 10 7 l0 6 Rn. (s2 ) 10, l0 3 10, -l-2 Y6s(v ) Fis. 14 u-l tull logic r-

25、-1 I i cx7l 8D iti iHi Time constant circuit F is. 15 Operating Description The input signal (LT t * +rstltf.t gy :1,:!:,:pl t.# t* ;i,r, ri,frl* *1* *:,.f, t c.* N. * *.f,l.,1 f :. ,*:tra,*1.* il t , ,l;1 ,*1 5 *: -:lr.*: ff *: : :*:.r*: * $ili 5.grx 31 9. DIAL CORD STRINGING 1. Turn the tuning cap

26、acitor so that its plates protrude as much as possible. 2. Tie one end of the string to the spring on the Tuning drum (attached to the tuning capacitor). 3. Lead the string around pulleys A, B, C, D and E, then wind it 3 turns around the tuning shaft. 4. Lead the string around pulleys F and G, then

27、wind it 2 turns around the Tuning drum. 5. Now tie the other end of the string to the spring on the Tuning drum. Turn the tuning shaft and check for proper function. Then trim the ends of the string. 6. Turn the tuning shaft until the plates of the variable are all the way in. Move the pointer to th

28、e left-end starting point on the dial and fasten it to the string in that position. Dial pointer Tuning shaft 32 HA1137 (FlVl tF lc) HA1138 (ArU rC) HA1156 (Fwr MPX lC) GIX-g4slA 57 HA1452(EO AMP tC) HA 1 335 9 to il t2 t3t4t5 t6 ._ ,F+$lJ,r,) HA1 137 HA1 136 HA 1 336 9 ro an2t3t4 t5t6 ehhtsLhbrr4 W

29、 Index I 10 11 -12 1 Bottom plate s sl (FUNCT|ON) 3SK45 D . Gt 2SA72OA 2SA733 2SA763P 2SC945 2SC1318A 4 3 .l 2 id s2 (MOOE) Rear view 76 I 10 4 3 2r ,r. ,iO. J 11 12 Bottom 1 pl CX-718D Index 2S8507 2SD31 3 25D525 2SC 1384 M51 651 P to il 12 t314t5 t6 t7 t8 tlJ.!#1j1,tr. W cx-049 HA1 156 HA 1452 I9

30、tot ilz t3t4 ,zhtshbLlrn_, W A1 Index 25K4OV n-D a t+-G A-JE 25A679 2S8530 2SC 1 079 25D370 /ffO,-C I ll z- tli +B -rr d 2SK3OA 2SA725 2SA7 26 2SC461 2SC869 2SC7 17 25 C1312 2SC 1344 258527 258528 25D357 25D358 ffi3 2SC 1 682 ryE 2SC 1451 E c B E c B 515 415 315 215 ,t 15 515 4/53/52/51/5 423 ilt r

31、J t- t4 t5 16 17,89202t?2, ,LLL$- 4 4 A, t3 p W? 13.3 HEADPHONE JACK ASSEMBLY (RWX.Os4) Switch circuit assy No.17 S8 (power boosting) Switch circuit assy No.15 S8 (power boosting) Parts List of Headphone Jack Assembly (AWX-054) RESISTORS Switch circuit assy No.13 Realy Switch circuit assy No.1 1 Rel

32、ay Fg RzJ Rr 150 150 3.3K(3W) -1-Co 10,000/5c rR, :.sK(gw) !c, 10,000/5c zCH 4CH ss 2CH 4CH Power transformer (V LT) Power transformer ( R ED) Power transformer (V LT) Power transformer ( R ED) Power ampl if ier assembly-No. 24 SEMICON DUCTORS SymbolDescriptionPart No. D1 D2 D3 D4 D5 D6 D-t D8 Diode

33、 Diode Diode Diode Diode Diode Diode Diode SR3AM-4 SR3AM-4 SR3AM-4 SR3AM-4 SR3AM.4 SR3AM-4 SR3AM-4 SR3AM-4 6B I A B c D A c D -:i:!1:):i:.tza:a:;iiii;$rrdi,t*,rfi:;:;li,iiiititg:|l:,:)lii!|:,i/A,a,:;:,ai:; z O J J t- k LU (-D L ! : :,.1:r,:r.:r :1:r: (-) O s) L IO z : tati; q;: o cJ:l a S; Itl f;i :

34、 : yL8e ! I2 d .: -i t 13.7 PROTECTTON CtRCUtT ASSEMBLY (AWM-079) q; cf 2 I c( c) -i + E !+ (9 5 _ (t, di ct .) ) n o 4) N r $ (r (n O d ! CI d (? E- $ ! t) = O 5 L l- I i I I i t 0 r/za0 0l OIILLOL)otlzzotJ a3 Gl)(-g4sA Power supply circuit A assembly-No.15 Power amplifier assembly B-No.4 Power amp

35、lifier assembly A-No.4 Power amplifier assembly A-No.23 Power amplifier assembly B-No.23 Power amplifier assembly B-No.1 Power amplifier assembly B-No.2 Power amplifier assembly A-No.1 Power amplifier assembly A-No.2 Power amplifier assembly A-No.26 Power amplifier assembly A-No.25 Power amplifier a

36、ssembly B-No.26 Power amplifier assembly B-No.25 Power supply circuit A assembly-No.9 Relay coils I Fower supply circuit A assembly-Nos.20,21 - Sg .3- S8 c-s| o+-o Y+ E; . n7v g Y13t c-lvt/- o 7v .o l; i3.9V Sg $e-nnr+ ,3)11 e.-lll-o o-ANt+EEdK) e+w Eg I $ -.rurrt-,rtfr, $E e-At*- raAA|+gEd 9- o-t(+

37、EF effFrrGg J ;i.r,rru- ov -oi1+ s F G sEt$-4FY P o-ru+-+ef o-rAAk;lJ I5TG.+: EE-+m- $, .o o, I?.ZY _a a. i; t 5g qE*6$*, r+rv =c_*+Eg e-F+t R pe-rw-=q S I -N-pI S: ei +6 , Parts List of Protection Circuit Assembly (AWM-O79) CAPACITORS SymbolDescription Part No. c1 c2 c3 c4 c5 c6 c7 c8 Electrolytic

38、O.22 10V Electrolytic O.22 10V Electrolytic O.22 10V Electrolytic O.22 10V Electrolytic 4-1O 6V Electrolytic 47O 6V Electrolytic 22O 10V Electrolytic 4.7 25V CSSA R22M 1O CSSA R22M 1O CSSA R22M 1O CSSA R22M 1O cEA 471P 6 cEA 471P 6 cEA 221P 10 CEA 4R7P 25 SymbolDescriptionPart No. R36 R37 R38 Carbon

39、 film 2.2k Carbon ilm 15k Carbon film 47k RD%PM 222J RD%PM 153J RD%PM 413J RESISTORS SymbolDescriptionPart No. R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R30 R31 R32 R33 R34 R35 Carbon film 3.3k Carbon film 3.3k Carbon film 3.3k Carbon

40、film 3.3k Carbon film 3.3k Carbon f ilm 3.3k Carbon film 3.3k Carbon film 3.3k Carbon f ilm 15k Carbon f ilm 15k Carbon film 15k Carbon f ilm 15k Carbon f ilm 15k Carbon f ilm 15k Carbon f ilm 15k Carbon f ilm 15k Carbon film 47k Carbon film 47k Carbon film 47k Carbon film 4-1k Carbon f ilm 1.5k Car

41、bon f ilm 1.5k Carbon film 82 Carbon film 82 Carbon film 5.6k Carbon f ilm 15k Carbon f ilm 15k Carbon f ilm 91k Carbon film A-2k Carbon film 5.6k Carbon film 56k Carbon film 1Ok Carbon film 27k Carbon film 22 Metal oxide 911W RD%PM 332J RD%PM 332J RD%PM 332J RD74PM 332J RD!/4PM 332J RD74PM 332J RDz

42、.PM 332J RD%PM 332J RD74PM 153J RDY4PM 153J RD%PM 153J RD%PM 153J RD74PM 153J RD/.PM 153J RD7.PM 153J RD%PM 153J RD%PM 473J RD%PM 473J RD%PM 473J RD74PM 473J RD%PM 152J RD%PM 152J RD%PM B2OJ RD%PM 82OJ RD74PM 562J RD74PM 153J RD%PM 153J RD%PM 913J RD%PM 822J RD%PM 562J RD74PM 563J FIDT4PM 1O3J RD%PM

43、 273J RD%PM 22OJ RSlP 91OJ SEMICONDUCTORS SymbolDescriptionPart No, o1 a2 o3 o4 o5 o6 a o8 o9 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 Transistor Transi stor T ra nsistor T ra nsistor Transisto r Transistor Tra nsistor Transistor Tra nsistor Diode Diode Diode Diode Diode Diode Diode Diode Diode Diode

44、Diode Diode 2SC869-C, B or (2SC1515K) 2SC869-C, B or (2SC1515K) 2SC869-C, B or (2SC1515K) 2SC869-C, B or (2SC1515K) 2SC945-R or O 2SC945-R or O 2SA733-R or Q 2SC945-R or Q 2SC1384-0 or R 152472 152472 152472 152472 152472 152472 152472 152472 152472 152473 152473 152473 D D D D a5 2 13.8 CONTROL AMP

45、LTFTER ASSEMBLY (AWG-023) 25.5/ 16 r ls t+ ldt fir 28.5ll Rrr -l I Rss 5 6K C! cn O a. () ) O t- . rt) (J , +! R:s Rst t- (o (J o?t F 6 1 /l- 11a l5K 131 lul 15 vl ) (:) E c6ro.01l ) O(11 OM n cD .a (Y 22175 O tr) f- . c) 6 (J ) (= =- cl R4s 5 6K + ) I a)- co : O = Rzr 12 K0Il qt Cs 100P L-: cY 7/ c

46、21 3o0P R+z a I .) r(_) t l-(_) D cl (ja *t :? CZ cJa i: r-l0 R+: ; c,) 3 c, op D_ C! (Y O tta vl +., an I ne2 R+ C+o CY. = u Czs rO iO (_) R+a _J 86 13.9 POWER SUppLy CtRCU|T A ASSEMBLY (AWR-0So) FTJSE D, slBot- 01 3A FUSED2 slBot - 02 0r 250525 20 21 1B 1A c2 0.01 D3 sIBot-02 + Lr) +? o 9 = O c14

47、2200/63 FUSE oo SlB0l-02 o+25D3l3 as 2SBSOTP 1A cO = (A crs 100/80 as 2SA?20A O cO Or 9+ t 6 O tr) o I s (J I t_ D6 wz- t30 cs qo/16 Y f- + q C = V) O 99otl) + crd (! c! d) (J o_ O O O (-) d Re 82 2SCt3t8A = Crs i + 0.01 ? R+ 180 ( bW) J# TCe I o.ot 2SCl3l8A ? 8z e 2sc945 ITB .! gjH #- 1000P 311,o_1

48、F% I Cr+1000P t).du ?3 * t2,uo *lo,uo JJ2 14V p5 r41-146 q-.1 o-4AAr-s I I Rl o Rs l6K I Czo # Cro nAottt TloooP ftoo/re 13.5V Parts List of Power Supply Circuit A Assembly (RWR-O80) v CAPACITORS .Enr Symbol Description Part No. c1 c2 c3 c4 c5 c6 c7 c8 c9 c10 c11 c12 c13 c14 c15 c16 c17 c18 c19 c20

49、c21 Ceramic Ceramic Ceramic Ceramic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Ceramic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Ceramic Ceramic Ceramic 0.01 150V 0.01 150V 0.01 150V 0.01 150V 470 16V 470 220 220 220 100 100 47 0.01 2,200 100 100 100 100 0.01 0.