Pioneer-SX550-rec-sm维修电路原理图.pdf

. $F) * / ;i.,., 3 l j j j ()rrroNEEFI RadioFans.CN 收音机爱 好者资料库 The following locations in the text are incorrect. Please perform the corrections shown below. O CIRCUIT DESCRIPTION o EACH MODEL (SX-ssO/KU, HG.S) Power supply transformer connected to AF amplifier assembly is not a lead wire type, but instead, it is connected by a terminal strip. Delete lead wire color indications and write in terminal numbers indicated below. sx-550/KU sx-550/HG SX-550/S AC nov 60 Hr O PAGE 50 Change printed board fuse Fu5 0.5A to 1.5A. Change fuse FuB 1.5A to 0.8A. t3t I s - a I I ffi *ilve-l: T MWER IND 8v 50iA O , FUSE HoLDER No. Incorrect Correct Page 9 AM tuner line 1 dualsingle Page 9 phono equalizer amplifier line B metal oxide carbon film Page 10 tone control line 10 - gdB - 10dB RadioFans.CN 收音机爱 好者资料库 This Service Manual is applicable only to the KC, KU model.sx-s5C CONTENTS 1 . 2. 3. 4. FRONT PANEL FACILITIES CONNECTION DIAGRAM CIRCUIT DESCRIPTIONS SPECIFICATIONS BLOCK DIAGRAM LEVEL DIAGRAM 4 6 7 I 12 13 14 16 5. 6. 7. 8. 9. DIAL CORD STRINGING DISASSEMBLY 9.1 AM Section 9.2 FM Section ADJUSTING PROCEDURES 9.3 MPX Section 17 18 19 20 21 23 25 27 29 31 33 34 9.4 Power Amplifier (ldle Current) 10. PARTS LOCATION 10.1 Front Panel View 1O.2 Rear Panel View 10.3 Top View 10.4 Front View 1 1 .EXPLODED VIEWS 11.1 Exterior 11.2 Part 1 1 1.3 Part 2 AF As-sembly (AWKO56 11.4 Part 3 RF Assembly (AWE-072) 12. SCHEMATIC DIAGRAMS. P.C. BOARD PATTERNS AND PARTS LISTS 12,1 MiscellaneousParts 12.2 Schematic Diagram 12.3 RF Assembly (AWE-072-0) 12.4 AF Amplifier Assembly (AWK-056) 12.5 AF Muting Assembly (AWM-101) 13. PACKING L ist.36 37 40 47 53 55 SX-550/KU. HG. S Additional Service Manual . Enclosed Herewith RadioFans.CN 收音机爱 好者资料库 1. SPECIFICATIONS Semiconductors F E T s . . . . . . . . | C s . . . . . . . . . . T r a n s i s t o r s . . . . D i o d e s . . . . . . . Power Amplifier Section Continuous Power Output from 20 Hertz to 20,000 Hertz (Both channels driven). . . 20 watt5 per channel (8 ohms) Total Harmonic Distortion (20 Hertz to 20,000 Hertz, from AUX) Continuous Rated PowerOutput . . . . . . . 10 watts per channel power output, 8 o h m s . . I watt per channel power output, 8 ohms. . . . . No more than Q.07% Intermodulation Distortion (50 Hertz : 7,000 Hertz = 4 : 1, from AUX) Continuous Rated PowerOutput . . . . . . 10 watts per channel power output, 8 o h m s . . I watt per channel power output_ 8 o h m s . . Damping Factor .3 .5 . 2 8 . 2 1 No more than 0.3% No more than 0.07% . No more than O.3o/o No more than 0.07% No more than 0.07% (20Hr to 20,000H2,8 ohms) . I nput Sensitivity/l mpedance PHONO . M t c . . . . A U X . . . T A P E P L A Y I . . . . . . T A P E P L A Y 2 . . . . . . TAPE PLAY 2 (DlN connector) PHONO Overload Level (T.H.D. 0.1 7o) PHONO . Output Level/lmpedance T A P E R E C l . . . . . . TAPE REC 2 TAPE REC 2 (DlN connector) SPEAKER HEADPHONES. Frequency Response PHONO (RIAA equalization) . AUX, TAPE PLAY . . . Tone Control B A 5 5 . . . . . . . . . . . . . 2 5 2.5mV/50k ohms 7.5mV/50k ohms 150mV/50k ohms 150mV/50k ohms 150mV/50k ohms 150mV/50k ohms 200mV (l kHz) . . . . 1 5 0 m V . . . . . . . 1 5 0 m V . 30mV/80k ohms . . . . . A , B , A + B . Low lmpedance 30Hz to 15,00OH2 10.3d8 . loHz to 60,000HzlidB . . +9d8, -10d8 (100H2) TREBLE. . t8dB (10kHz) Loudness Contour (Volume control set at -40d8 position) . . . . +6dB (100H2), +rag 119kH.1 RadioFans.CN 收音机爱 好者资料库 Hum and Noise (lHF, short-circuited, A Network, rated power) P H o N o . . . . . . . . . 7 0 d 8 A U X T A P E P L A Y . . . . . . . . . . . 9 0 d 8 FM Section Usable Sensitivity I l.2dBf (2.0!v) 20.0dBf (s.spv) 18.3dBf (4.ssv) 50dB Quieting Sensitivity . . . . . MONO . . . . . sTEREO. . 39.2dBf (509V) Signal to Noise Ratio at 65dBf . . . . . . . MONO . . . . . . . 70dB S T E R E O . . . . . . 6 5 d B D i s t o r t i o n a t 6 5 d B f 1 0 0 H 2 . . . . . . . M O N O . . . . . . . . O S % s T E R E O . . . . . . . 0 3 % M O N O . . . . . . . S T E R E O . . . . . . M O N O . . . . . . . . O . 1 5 % S T E R E O . . . . . . . 0 . 3 % M O N O . . . . . . . . . o . 4 % S T E R E O . . . . . . . O . 4 % . 30Hz to 15,000H2 r3:3dB . . . . . . l . O d B . . . . . . 6 0 d 8 . . . . 65d8 Built-in Ferrite Loopstick Antenna six-s5C, NOTE: Specificotios ond the design subject to poscible modificotion without notice due to improoementg. Spurious Response Ratio . . . .75d8 l m age Resp o n s e R a t io . . . . . . . . . .65d8 lF Response Ratio . . 90dB A M S u p p r e s s i o n R a t i o . . . . . . . . . . 5 0 d 8 MutingThreshold . t4dBf (2.8pV) Stereo Separation 40dB (1kHz), 30dB (30H2 - 15kHz) S u bcarri e r P ro d u c t R a t io . . . . . . . . 40d8 S C A R e j e c t i o n R a t i o . . . . . . . . . . . 4 0 d 8 Antenna Input . 300ohms balanced 75 ohms unbalanced AM Section Sensitivity (lHF, Ferrite antenna) . I kHz 6 k H 2 . . . . . . frequency Response . Capture Ratio Allernate Channel Selectivity . . . (lHF, Ext. antenna) Selectivity Signal-to-Noise Ratio. . . . . lmage Response Ratio . . . . lF Regoonse Ratio. . . . . . Antenna. Misceilaneous Power Requirements . PowerConsumption. Dimensions . . l2OY 6QHz . . . UL; 80W, 185W (max.) c s A ; l 5 5 v A . . . . . . . .148(w)x141(H)x307(D) mm 1 7al8(w)xs-9/16(H)x12-l /1 6(D) in Weight . Without package . . . . . . . 9.4kg (20 |b 11 oz) With package 10.5kg (23 lb 2 oz) Furnished Parts FM T-type Antenna Operating Instructions RadioFans.CN 收音机爱 好者资料库 T-TYPE FM ANTENNA 2. CONNECTION DIAGRAM OUTDOOR FM ANTENNA 3ooa AM ANTENNA (lndoor or Outdoor) FM DE.EMPHASIS SWlTCH Normaf ly, set this switch to 751ts. Be sure to set it to 251rs only when listening to an FM broadcast (pre- emphasis; 25rrsec.) with a Dolby* system NR adaptor connected between the TAPE terminals. CONVENIENCE OUTL Unswitched (3OOW max.l: Less frequent ly used components, which do not re- quire coupled power, can be plugged into either of these outlets. Switched (200W max.l: A frequen used component (turntable, tape deck, etc.) can be plugged into this outlet. By leaving the power switch of that compo- nent in the ON position, power supply to the component will be coupled with the SX-550 switch operation. GROUND TURNTABLE CARTRIDGE TAPE PLAYER OUTPUT TAPE DECK RIGHT LEFT SPEAKER SYSTEMS A I I DIN TYPE I CORD loureur INPUT TAPE DECK (Open-reel, cassettel .m, ffil Til LEFT RIGHT 6 .ffi) 75oLI-l coax rall l cable I I r-1 _*.r _!- _l*-t : B E E E E E : - (Open-reel, cassette) SPEAKER SYSTEMS B RadioFans.CN 收音机爱 好者资料库 3. FRONT PANEL FACILITIES SPEAKERS SWTTCH (POWER) A combined power ON/OFF switch and speaker system selector switch. POWER OFF: A: OFF: B : A + B :To listen simultaneously to speaker systems connected to A and B speaker terminals. NOTES: . After turning this switch ON there is a delay of some Z to 9 seconds, during which time the muting circuit operates to eliminate unpleasant noise. c For easier operation, plug powgr cord for turntable, etc. into the switched convenience outlet. PHONES f ACK To listen through stereo headphones, plug them firmly into this jack. WARNING: Dct not plug a microphone into the PHONES jach as you may damage the microphone. BASS d . : c oo i i o _E !-l -f - gi 4- =!Fl-J*-l <+ - LL $ 5 ? z= O D < I - L 6 ; O ; U i z q ;= El? qr 3 3 -lE 3l I y - - l : I L =li 3ll z z l u o - l . < - l a r u n L . _ l c . ) . - j O N r;l iai I ! : i r d t l ! l I L- rl- l - l ! F l l * L i l : k L.- r/) (/) (a ; U F z. I i i i i i L r I i ,l (L E c, ul z o F I t! t/, J o c. l- z o IJ f- I ir c = (-, E L o E E I I t so oo L o + o.= H 3 r l J t *l u J FI ill L. t |* o o z 0 r t u z z. U F z -tl el G , , tr.l I l l ti RadioFans.CN 收音机爱 好者资料库 sx-55cl 6. LEVEL DIAGRAM 60 50 40 30 20 10 0 - 1 0 -20 -30 -40 LEVEL ( dBv) -50 -60 13.sv (80 ) rT-r cr) c! c! cr) I AUX ( 150mV) A MIC ( 7.5mV ) c! I (r) 6 o PH0N0 ( 2.5mV) 0dBv: lV FREOUENCY: lkHz t 5 RadioFans.CN 收音机爱 好者资料库 7. DSASSEMBLY REMOVE SIDE BOARDS Side board can be removed by taking out 4 screws shown in figure. When reinstalling, observe that space does not occur between them and front panel. NS REMOVE TOP PLATE Take out 2 screws shown in figure to remove. RadioFans.CN 收音机爱 好者资料库 six-E5Ct REMOVE BOTTOM PLATE Take out 8 screws shown in ward to remove. figure and pull rear- 2 REMOVE FRONT PANEL Use allen hex wrench to loosen tuning knob set- screw and remove knob. Pull off all knobs (except push buttons), then remove shaft nuts of FUNC- TION and SPEAKERS switches. Take out upper left and right screws (2 screws) of front panel and remove. - c ) -*+g;:i;:-* 8 I I )/4 :( ,:,LW RadioFans.CN 收音机爱 好者资料库 8. DIAL CORD STRINGING 1. Tie end of cord to inner stud of dial pulley. 2. Close tuning capacitor blades fully. 3. Pass cord through dial pulley opening, make a half turn around pulley, then pa.ss in the route: pulley A-dial needle-B-C-dial shaft-D-dial pulley. 4. Wind cord clockwise (as viewed Fom rear panel) 3 turns around dial shaft, then route to pulley D. 5. Wind 3 turns around dial pulley and tie to spring so that the cord is under tension. 6. Turn TUNING knob and confirm that dial needle moves smoothly. 7. With tuning capacitor blades fully closed, move dial needle to starting point (left edge of scale). 8. Apply lacquer to tied ends of cord. CAUTION: Do not touch dial needle with the hand. Handle dial needle only by the molded portion. Smudges and finger-prints cannot be removed from metallic portion of needle. Dial pulley Dial shaft needle B r O ) z- RadioFans.CN 收音机爱 好者资料库 9. ADJUSTING PROCEDURES 9.1 AM SECTION 1. Through a lk ohm resistor, connect an AM signal generator to the AM antenna terminal. Set for 400H2 at 30dB and 30% modulation. 2. Connect AC VM (Voltmeter) to TAPE REC jack (L or R). Set FUNCTION switch to AM position. Set AM SG and SX-550 dial indication to point A (60OkHz). Adjust T6 for maximum indication on AC VM. Set AM SG and SX-550 dial indication to Doint C (1,400kH2). I ,l o. sx-Ei=Cl 7. Adjust TC4 for maximum indication on AC VM. 8. Again set AM SG and SX-550 dial indication to point A. 9. Adjust bar antenna core for maximum indica- tion on AC VM. 10. Return AM SG and SX-550 dial indication to point C. 11. Adjust TC5 for maximum indication on AC VM, 12. Repeat steps 4-11 to eliminate variations in AC VM indications at points A and C. r : AC voltmeter 1k ohm resistor t r RadioFans.CN 收音机爱 好者资料库 9.2 FM SECTION 1. Through 300 ohm dummy antenna, connect FM signal generator to the 300 ohm FM antenna terminals and set for 400H2 at 100d8 and IOOVo modulation. 2. Connect AC VM and distortion meter to TAPE REC jack (L or R). 3. Set FUNCTION switch to FM and MUTING switch to OFF. Set FM SG and SX-550 dial indication to point A (90MHz). Adjust T3 for maximum indication on AC VM. Adjust T5 lower core for center of scale indica- tion on Tuning meter. Set FM SG for 9dB output and adjust T1 and T2 for maximum indication on AC VM. Set FM SG and SX-550 dia.l indication to point C (106MHz). 9. Adjust TC3, then TC1 and TC2 for maximum indication on AC VM. 10. Again set FM SG and SX-550 dial indication to point A. 11. Adjust T3, then T1 and T2 for maxirnum indi- cation on AC VM. 12. Repeat steps 8-11 to eliminate variations in sensitivity at points A and C. 13. Adjust T4 for maximum sensitivity. 14. Detune to noise only and adjust Tb lower core for center of scale indication on Tuning meter. 15. Set SX-550 dial indication to point B (98MHz) and adjust FM SG for center of scale indication on Tuning meter. 16. Set FM SG output to 60dB and adjust Tb upper core for minimum distortion. 1?. Repeat steps 14-16 to eliminate variations in minimum distortion position. (t. ,7 8. ! * AC voltmeter Distortion meter Flvl signal generator u RadioFans.CN 收音机爱 好者资料库 9.3 MPX SECTTON 1. Through 300 ohm dummy antenna, connect FM signal generator to 300 ohm FM antenna terminals. 2. Connect multiplex signal generator to externa.l modulation terminals of FM SG. 3. Connect oscilloscope horizontal input to MPX SG pilot output and vertical input via probe to TP (No. 31) of circuit board sx-55Cl 4. Set SX-550 dial indication to 98MHz and adjust FM SQ for center of scale indication on Tuning meter. 5. With FM SG unmodulated, adjust VR1 so that lissajous pattern on oscilloscope becomes sta- tionary. 6. With MPX SG modulation 1kHz, L+R 67.5kHz deviation and Pilot 7.5kHz deviation. adiust T4 for minimum distortion. Oscilloscope MPX signal generator AC voltmeter Distortion meter nE o ll- 300 ohm dummy antenna RadioFans.CN 收音机爱 好者资料库 9.4 POWER AMPLIFIER (IDLE CURRENT) 1. Set BASS and TREBLE controls to FLAT positions. 2. Connect DC voltmeter to circuit board TP terminals (L = 34 o, 33 g; fi, = 35 ,36 o) and adjust VR3 (L) and VR4 (R) for 25mV. 3. Readjust after approximately 15 minutes (speci fication range is 15mV to 40mV). DC voltmeter E i o RadioFans.CN 收音机爱 好者资料库 10. 10.1 1 PARTS LOCATION FRONT PANEL VIEW Front panel assembly ANB.417 Knob (SPEAKER) - - AAB.lOO i Knob BASS, TREBLE) AAB.O99 Knob (FM MUTING, MONO) AAD.l 1O RadioFans.CN 收音机爱 好者资料库 Knob (TUNING) AAA-036 Knob (VOLUME) AAB.11O Knob (FUNCTION) AAB.lOO Knob IBALANCE) AAB.O99 RadioFans.CN 收音机爱 好者资料库 IO.2 REAR PANEL VIEW t t t t t I t t I t, t I t l, I t t r, I l l llln, | | | I | | | | | | | | | | | | | il t I il l l l l t l, il n,tilllilllltf f f t il il l l il ilr ill Term ina | (ANTENNA) AKE.O28 Term inal 4P AKB-027 DIN connector (REC/PLAY) A K P 011 23 socket RadioFans.CN 收音机爱 好者资料库 AC socket (AC OUTLETS) AKP OO4 n l llil | l t l il il nt tnttnilnrtltr | | ll | | | | | | | | |lI IIIlltttltntttnt AC power cord ADG.OO5 Fuse cover AEC 249 Terminal (SPEAKERS) A KE-029 Ferrite bar-antenna AXB.O06 RadioFans.CN 收音机爱 好者资料库 10.3 TOP VtEW Acrylic board AEC,240 I I FW *frn- Jr- Electrolytic capacitor ACH-055 Tuning shaft assembly AXA.117 RF assembly AWE.O72 Dial pulley assembly AXA,O66 RadioFans.CN 收音机爱 好者资料库 s)<-550 Lamp assembly (PL1,2,3) AE L 060 ;o I (3, Jl. Power transformer (Tl ) ATT.263 AF assembly AWK 056 AF MUTING assemblY AWM,1O1 RadioFans.CN 收音机爱 好者资料库 1O.4 FRONT VIEW IVleter AAW 053 Variable resistor (BASS, TREBLE) ACV.138 Push switch (Fl,1 lvlUTlNG, IVIODE) ASG.O92 Variable r( ACV 126 Phone iack (PHON ES) AKN-OO9 selector switch (SPEAKER ) ASA-042 RadioFans.CN 收音机爱 好者资料库 Tuning shaft assembly AXA-1 17 Phone jack MlC) A K N ,011 Selector switch (FUNCTION) ASD.O48 Push switch LOUDNESS, TAPE l,lONlTOR 1,2) ASG-093 Variable resistor (VOLUME) ACV 161 Variable resistor (BALANCE) ACV,126 RadioFans.CN 收音机爱 好者资料库 11. EXPLODED VIEWS 11.1 EXTERIOR Lamp assembly (PL1. 2, 3) AEL-O6O Wire connector AEC-308 RT 3x6 Dial scale board AAG.I13 BM 3x8 I Washer B?22-017 Knob (TUNING) AAA-036 RT 3x8 AB4-066 Acrylic board AEC-240 RT 3x8 ABA.066 Screw ABA-113 . %, d- . d Side board (L) AMS-012 ptate L .-.AAH-027 capacitor .- ACG-001 _6 eP | <. a Dial pointer AAF-046 Nylon sheet AEC-191 Knob (FM MUTING, MONO. LOUDNESS, TAPE MO