Pioneer SPEC-2 Service Manual Download

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Summary of Contents for SPEC-2

Page 1: ...STEREO POWERAMPLIFIER SPEGI KCU DrrroNEER ...

Page 2: ...URES 6 1 ldleCurrent Adiustment 13 6 2 Current Limiter SensitivityAdiustment 14 6 3 Meter Amplifier Adjustment 15 D SASSEMBLY 16 PARTS LOCATTONS 20 5 6 7 8 9 10 EXPLODED VIEWS SCHEMATIC DIAGRAMS P C BOARDPATTERNS AND PARTSLIST 10 1 Schematic Diagram andMiscellaneous Parts 30 10 2 Power Supply CircuitAssembly AWR 093 33 10 3 PowerAmplifierAssembly AWH 045 37 10 4 MeterAmplifierAssembly AWM 0811 42 ...

Page 3: ...on Continuous rated power output O lo o 125watts perchannel power output Sohms 0 05 1 wattperchannel power output 8 ohms O O5 Frequency Response 5 Hertzto 80 000HertzlldB Input Sensitivity lmpedance 2Vl50kohms Output Speaker 4ohmstoSohms Damping Factor 20Hertz to 20 000 Hertz Sohms 50 HumandNoise lHF short circuited A network 110d8 Miscellaneous Power Requirements AC 120V60Hertz Power Consumotion ...

Page 4: ...mp stays on during operation turn off the POWERswitch and check as describedin the section Protection Circuit Operation After identifying and correctingthe sourceof difficulty if the lamp still fails to extinguish contact a Pioneer Authorized Service Center INPUTLEVELCONTROLS LEFT RIGHT Adjust LEFT and RIGHT controls accordingto the output level voltage of the pre amplifier connectedto the SPEC 2I...

Page 5: ...al imDed ance of the spoaker syst ms em ployed with the SPEC 2 Be sure to turn otf the po r before chengingthis switch setting For about 6 to 12 seconds 6tter changing the position o the IMPEDANCE swirch the PRO TECTION lamp lights and sound is not obtained from the speaksr systems This is du6 to the built in muting circuit RIGHTCHANNEL LEFTCHANNEL SPEAKER SYSTEMS ...

Page 6: ... is depicted in Fig 1 Current flowing through R2 and Q8 becomesequal to that flowing through Rl and D2 In other words since R1 and R2 are equal and the characteristics of D2 and Q8 base emitter are also equal the current BL reaching point A in Fig 1 through R1 and D2 is equal to that reaching the samepoint through R2 and Q8 base emitter This becomes equivalent to having Q5 output directly driving ...

Page 7: ...d into positive and negative sides Each side consists of logarithmic compression peak value holding and voltage to current converter circuits In addition there is a cunent resultant circuits common to both sides The positive side circuit operation is described here SPEC p A portion of the pov er amplifier output signal is compressedby the logarithmic compression circuit which utilizes the exponent...

Page 8: ...ier becomesopen and the stagesbeyond the predriver are stopped operation completely by RL5 RL2 RLg and RL6 are for changing the trans former secondary taps when the impedance switch is selected and determining the value of the current control circuit in the power amplifier They are thus not directly related to the protectiorr func tion Zener diodes D2 and DB fix the operating poten tials of Q29 an...

Page 9: ...to be switched OFF SPEG El Although Q28 switches OFF again Q29 and Q30 continue in the OFF condition for severalseconds while C1 is charging Temperature Detector The temperature detector employs positive coeffi cient thermistors posistors Theseare temperature sensitiveelements possessinga positive temperature response rapidly increasing in resistance when a certain temperature is exceeded seeFigs ...

Page 10: ...y electrolytic capacitor charging current Two surge suppressor circuits are employed in the SPEC 2 one each in the primary and secondary power transformer circuits These circuits are shown in Fig 11 Power transformer excitation current is handled by the relay surge suppressor circuit at the primary side When the power switch is turned ON the current passes through R2 D1 and charges C1 therefore it...

Page 11: ...K DIAGRAM POWER AMPLIFIER LEFT I TNPUT I etl u il Li _ _ Qlr I PROTECTIOI LANP PROTECTION CIRCUIT t R I G H T INPUT 9_l l r u t f l RIGHT CHANNEL powERAMPLTFTER same as Lelt cirannel I l l I r l L E l t l 4 4 ...

Page 12: ...ER I lPEDANCE 8 0 4Q POTENTIOMETERS VRr LEFT LEVEL C0NTR0L VR2 RIGHT LEVEL C0I TR0L RELAYS RL1 PRIMARY SURGE CURRENT CONTROL RL2 RLs SECSNDARY SURGE CURRENT CONTROL AND VOLTAGE SELECTOR RLn P0WER SUPPLY CUT_ OFFRELAY RL5 MUTING RELAY Rh CURRENT LIM TER SENSITIVITY CONTROL PEAK LEVEL METE R LEFT 1 TPUT RIGH 6 I PEAK LEVEL METER t ...

Page 13: ...STMENT Connect asshown in Fig 12 Set LEFT LEVEL and RIGHT LEVEL con trols on the front panel to minimum fully counter clockwise Set POWER switch to ON After I or 2 minutes adjust VR1 to give an indication of 30mV on the voltmeter After the po Merhas been ON for 30 minutes readjust VRl for 30mV indication on the voltmeter 3 4 Poweramplifierassembly 1 3 Fig 12 Connection Diagram for ldle CurrentAdju...

Page 14: ...t SPEC 2 impedance selector switch to 8O eventhough a 4O dummy load is used While the voltmeter indicated 30V 40 adjust VR2 to just distorted point the upper half of the waveform In the same manner adjust VR3 to just dis torted point the lower half with 28 3V 44 Waveform 1 2 3 V R 3 Voltmeter Osilloscope ooo AF signalgenerator Fig 13 ThePosition of VR2 andVR3 ilPur la Fig 14 Connection Diagram for...

Page 15: ...7V on the voltmeter At this time adjust VR1 left channel VR2 is for right channel for OdB 250W indication on the LEVEL meter SPEG E V R 2 The Positionof VR 1 V R l andVR2 Fis 15 SPEC 2 r INPUT I A R A F S aa t t J Meteramplifierassembly Voltmeter RIGHT Fig 16 Connection Diagram for MeterAmplifierAdjustment 1 5 ...

Page 16: ...SEMBLY 1 Removingthe Top Cover Remove t eL2 screws A to detach the top cover 2 Removing the Bottom Plate Remove the13 screws B to detachthe bottom plate A Y A 9 A E A I g a rutez tt soo i a A ToP cover n A i u ...

Page 17: ...Remove all control knobs by pulling them out 2 Remove the LEFT LEVEL and RIGHT LEVEL shaft nuts and washers 3 Remove the 4 screws C on each side of the main body The front panel is ready for removal Front panel Mainbody 7 j c Washer 1 7 ...

Page 18: ...t panel 2 Unscrew the 4 screws D Remove the panel stay 3 Unscrew the 4 screws E which mount the printed circuit board on peak level meter This allows the printed circuit board to be moved though the distance is limited by the length of lts lead wire Meteramplifierassembly Panel stay ...

Page 19: ...embly 1 Removethe top cover and bottom plate 2 Unscrew the 4 screws F which mount the power amplifier assembly on the rear panel 3 Unscrew the 4 screws G which mount the printed circuit board on the heat sink Printedcircuitboard Heatsink 1 9 ...

Page 20: ...fier assembly R I G H TC H A N N E L AWH 045 Powersupply circuitassembly AWR 093 Electrolytic capacitor r5 00 F100v ACH 052 Poweramplitier assembly LEFTCHANNEL AWH 045 Power transformer ArT 245 Meter amplifier assembly AWM 081 Oiode KBH2504 ...

Page 21: ...358 Knob L E F TL E V E L AAB 097 E 3 m 8 Knob RI G H TL E V E L AAB 097 Hand le ANK O84 Variableresistor 100ko B L E F TL E V E L ACV 009 Variableresistor 100kf B RI GH T L E VEL ACV 009 Peaklevelmeter RI G H TC H A N N E L AAW O51 Leverswitch POWER ASK OSO Peaklevelmeter L EF T C H A N N E L AAW O51 Lampwith wire 8V 50mA PROTECTTON AEL O42 ...

Page 22: ...4 RearView Input terminal AKB O13 Output terminal A AKE 02O Spacer AEB O75 Spacer AEB 075 Qround terminal AKE O19 Output terminal B AKE O21 Slide switch IMPEDANCE ASH 014 ...

Page 23: ... panelassembly ANB 358 P M 4 x 1 0 d BM 3xg rTw 30 9 P M 4 x 1 0 ii i ii1iitiiil i r iiirf ii i tir 1 PM 3x8 iri FW 3 x0 5t PART 1 Spacer9dx1t M45 086 Handle ANK 084 illliliJtlirj l t 1 i Y Knob POWER AAD 109 Knob L E F TL E V E L R I G H T AAB 097 1i1r1 tl iii il V E L LE PM 3x8 FW 3 x 0 51 Nut M9 871 004 3 rTW 3d ...

Page 24: ...sIrEc e PART3 S e page27 i r P M 4 x 1 0 RT 4x16 Foot assembly AEC 178 RT 4x16 b BM 3x8 Foot assembly AEC 178 RT 4x16 itTW30 ...

Page 25: ...ttb supplied Lamp bar type 8V PL t 1 i Metpfamplifierassembly AWM 081 N 3d Relay ASR O15 PM 4x8 PLsocket AKK OO2 r i i iii i r ii i fl ira RT 3x6 orw ao AEL 058 ffi qgf l i r Rubber holder AEB 051 Lampwith wire8V 50mA AEL O42 A B c D A B c D 3 25 ...

Page 26: ... 2504 PM 4x10 Power supply circu AWR 093 T 4x8 RT 4x8 RT 4x16 sw 30 TerminalstriP 4P 1 PM 3x8 RT 3x6 it assembly Ceramic 0 01pF 1 ACG 00 RT Fuse1 AEK 1I Electrolytic 15 0001rF t00V ACH 052 i itlii 1 i i 1j 1i i 1 t i it r i tft itjiri rl lilsi I Electrolyticcapaci B B c c Springwasher M6 ABE 026 Nut M6 Springwasher MG ABE 026 Nut M6 ABN O17 Mounting pillar ALA O21 D D PM 4x10 26 ...

Page 27: ... 052 Terminalboardheldmetal M49 014 Slideswitch IMPEDANCE ASH 014 Connector assembly 3P ADX O23 Poweramplifierassembly AWH O45 Seepage28 ry BM 3x8 Screw ABA O89 c c t L Sonnector i sembly 6P 6DX 020 Connector assembly 5P ADX O22 OTW 4d Spacer wN 4O AEB 075 tt tinBUi i il rh l i i AKB 013 Connector assembly 5P ADX O22 D D conn to assernhly 6P ADXS21 Connectora sembly 3P ADX 024 i lr PoweF ampl ifie...

Page 28: ...ii ljt ri lf iL llt r il tr ft ii Powertransistor 2SC1 586 B M 3 x 1 0 Toggle nut AEC 225 Powertransistor 2SA909 PM 3x16 B B RT 3x8 Varistor STV4H I BM 3x8 Insulating wafer x c 076 c c Transistor socket AKH OO1 BM 3x8 Contactstrip 3P AKM 018 1 l i Contact strip 5P AKM O19 Contactstrip 6P AKM O2O BM 3x8 BM 3x8 D D 2e ...

Page 29: ...nescrew CM Countersunkheadmachine vt t octv Oval countersunk head F Tt Truss head machine screw r AM Binding head machinoscrew G PSA Pan head screw with sprjng PSB Panheadscrew with spring lock washer and flat washer PSF Pan head scr6w with flat washe Symbol EW Dsscriprion Shape E type Spring lock washer D SW N oil A4 I og Washer faced nut fl Internal toothed lock washer il oTw Outernal toothed lo...

Page 30: ...able resistor 1ook B LEFTLEVEL Variable resistor 100k B RIGHTLEVEL RS3P472K R53P472K ACV 009 ACV 009 Symbol D scription Part No F U l FU2 FU3 FU4 FU5 FU6 FU1 FU8 AEK 103 AEK 103 AEK 106 AEK 106 AEK 103 AEK 301 Fuse2A Secondary Fuse2A Secondary Fuse1A Secondary Fuse1A Secondary Fuse24 Secondary Fuse12A Primary l OTHERS Symbol D rcription Psrt No T1 PL1 PL2 PL3 PL4 PL5 RL1 RL4 D 1 D2 Powertransforme...

Page 31: ... Dro lS24 3 xs POWER N1P ASSy AWH 045 Rr 22 0 l524 3 N OTES SWITCHES Sr P0 ER SWITCH 0N oFF ST SPEAKER II IPEDANCE 8 4 Q flss2 lK 0n j wZiS ll 25850 RELAYS RLr R L r r R L RLs 0r o 2SA 33 xt os q o2SC945 xz rER AtlPAssy Awll 081 Fil u orDgz lS24 3x3t 6 or Qr Qr Qr2SC13l2 c E d r nt ilrlir il iriir t i ri rj nji iir i e er 0s 0c 6 2SA 25 i RrlK 2 i Drs 3 3 l ...

Page 32: ...3 SECONOARY SURGE CURRENT CONTROL ANOVOLTAGE SELECTOR RELAYS RL OUTPUT CUT OFFRELAY RLs NUTING RELAY ACr20V 50 60Hr c URRENT LIilITORSENSITIVITY CONTROL RELAY l l SIGNAL v0tTAGENECESSARY FOR OBTAINING 250fv 6Q oUTPUTPOWER lKHz DC VOLTASE AT NO INPUTSIGNAL i l OC VOLTA S AT 25OfV EQOUTPUT POWER DC CURREN T AT NO INPUTSIGNAL v v RLr 32 ...

Page 33: ...I Power transformer REO Powertransformer RED Power transformer OR Por ver transformer OR Cz Cs 15 000 1 xh4 Rr Rz 4 7ksl 3W Poweramplifier assembly No 21 Meter amplifier assembly No 23 Poweramplifier ass mbly No 5 Meter amplifier assembly No 7 ...

Page 34: ...ormer GRY transformer transformer BLU ramps 8V 0 3Ax4 Meteramplifier assembly No 5 amplitier assembly No 5 amplifier assembly No 7 amplifier ass6mbly No amplifierass mbly No 6 R CH Poweramplifier 6embty No 6 L CH amplifier ass mbly No 10 amplifier ass mbly No 11 ...

Page 35: ......

Page 36: ...5V Electrolytic 1000 35V ACG O04 0 ACG 004 0 acG 00 o ACG 004 0 ACG 004 0 ACG OO4 0 ACG O04 0 t cEA 471P35 5C cEA 102P35 85C SEMICONDUCTORS Sytnbol Oe cription Pr l No o l D2 D3 D4 D6 o7 DA D9 D 1 0 Diod Diode Diode Diode Diode Diods Diode Diode Diode Diod stB0l 04 st801 o4 srB01 04 stB0l 04 slBot 02 slBol o2 srB01 02 slaol o2 stB0l 02 stB01 o2 RESISTORS Symbol D cription Prrt No R 1 20 201 20 2w ...

Page 37: ...embly No 24 Polwrsupplycircuits mb y Nos 23 24 25 Pn Cr325A909 MEtsramplif ierasembly No 21 221 Meteramplitierassembly No 18 191 Power srpplycircuitassembly N06 32 31 34 smplifier ass mbly No 7 Power amplifierass mbly No 7 RCH Pourer supplycircuitNernbly No 28 ...

Page 38: ...Meter amplifisr assembly No 15 16 Metoramplifier assembly No 23 Powersupplycircuit ass mbly N 06 19 20 21 0 0 r 25C1586 VRr 100k B ...

Page 39: ...mU l f r rC d F t F M l Offuu 4i d c td s a at t O o 0i0tu N o o ct J uL t iE ZZel EE y8 tsu F f r o ct l n l t 06l sg l 1 9 e e N C l E G t 5c r y0 ilzu Y ry N tlzz u t o t_ 4 o vsttu E dI d i r 001t u 9A ol riil ri l cl o 6 jitn jg v F tlt r D a t r i o l3 o9o o 39 ...

Page 40: ...K RS3P102K RT2B2R2K RTSB1OOK RD PS 9 I1J RDY PS I32J ACP 051 o ACP 050 0 ACP 050 0 RESISTORS AND POTENTIOMETERS Carbon film 1ook Carbon film 100k Carbonlilm 22Ok Carbonfilrn 22Ok Carbon film 47 RDY PS225J RD PS 114J RD PS222J RD7 PS 153J ROlr rPSF122J ROIZPSF122J RD7 PS 333J RDz PS153J RS2P472K ROy PS472J RD PMF lOIJ RD PMF 101J RD PMF101J RD PMF 101J ao PsF 22oJ RDT PSF22OJ BDT PSF 114J BD PSF 22...

Page 41: ...ode Diode Diode Diod Diode Thermistor Thermistor P T C thermistor BZ 340 1S2473 1S1555 STV3H Y 1S2473 1S1555 152473 1S1555 stB0l 04 stB01 04 152413 1S1555 1S2473 1515551 STV4H TH101 2 TH101 2 AEX O44 OTHERS Symbol D 3criplion P rl No L1 R L l RL2 AF chokecoil Reodrelay Reodrelay ATH 012 0 ASR 017 0 ASR 005 C ...

Page 42: ...a C v X s s2 C ct cr s c c a q ct c CT N c r F o l I t rl g 00r zu I N o tfj t J t t a 1 t_ ystrzu t ra N o a l c a YlD00ereu l o I o GO 4 c l PE 6l J t n G l yOgi rsu n T t t al O O N 31 r 1 r r o ro m t cl i Ll C J l o i k 5 F o N 10 4 METERAMPLIFIER ASSEMBLY NWM O8l Jyl 9c 01 M visc 01 9t ZaDtJ sc zlst a 9 N Mzll vq r t O S o 0su r_ l o d 3 dtr t0 0zLJ S E t U o I o t 4 ...

Page 43: ...y No 2 l Power supply circuitassembly Nos 19 20 21 amplifierassembly No t6 Powersupplycircuit assembly Nos 23 24 25 Powersupplycirbuitassembly No 31 Powersupplycircuit assembly No 30 4f Poweramplifierassembly No 4 R CH 8s 4f 8r Poweramplifier assembly No l9 Poweramplifierassembly No 19 R CH Poweramplifierassembty No 4 L CH Su 43 ...

Page 44: ... Power transformer WHT Powertransformer BRN Powersupply circuit assembly No 35 supplycircuitassembly Nos 32 33 34 Poweramplifier assembly No 5 Power supplycircuitassembly No 27 rNo 19 L CH r RCH Powersupply circuit assembly No 26 ...

Page 45: ...lilm 22 Carbon film 150k Carbon Iilm 4 7k Carbon tilm 2 7k Carbon film 2 2k Carbonfilm 47k Carbon film 4 7k Carbon tilm 15k Carbon ilm 15k Carbontilm I k Metaloxide 330 Carbon film 1k Carbon film 22 Carbon film 22 Wirewound 4 7 Metaloxide 1k Carbontilm 47O Carbonfilm 47O hw vzw 1AW vd 1AW 5W 2W 100 B 100 B RD PS 332J RDY PS 332J RDY PS 332J RD PS 332J RD7 PS 332J RD PS332J RDY PS 332J RD PS 151J R...

Page 46: ...ode Diode Diode Diode Diode Diodo Diode Diode Oiode Diode Diode Zenor diode 2SC13 t 2 G 25A725 G 2SA725 G 2SA725 G 25A725 G 2SC1312 G 2SC13 t 2 G 2SC1312 G 2SC1312 G 2SA733 Oor R 2SC1384 Ror S 2SC945 O or R 2SC138 S 2SC138 Ror S 2SD313 D or E 2SB5O7 D or E 152473 152473 152473 1S2473 1S2473 152473 152473 152473 1S2473 152473 152473 1S2473 1S2473 152473 1s2473 ts2473 152473 1s2473 152473 1s2473 1S2...

Page 47: ... 09O Panel cover AHB 027 Polyethylene cover AHG O29 Operating instructions A R B 1 5 3 Frontpad AHA O91 Bottom AHA 096 Insidepacking AHC 023 Packing case AHD 272 SPEC El Connecting cord with pin plug ADE 013 Rearpad AHA 092 ...

Page 48: ...rAss l5P ConnectorAss 3P ConnectorAss 3P Washer lnternalToothed Lock RubberHolder Spacer Clip InsulatingWa er Terminal Board Togqle Nut Plastic Board Fuse2A Larnp with Wire 8V 50mA Lamp 8V 0 3A Top Pad Front Pad Rear P6d Bottom Pad Panel Cover Insid6Packing Packing Cas Polyelhylene Cover Input Terminal T rminal strip 4P Ground Terminal Oueut T6rminal A Output Terminal B Transistor Socket PL Socket...

Page 49: ...LECTFIC NICS CCIF PG FIATIGIN 75 oxfo cl D rwe Moonach e New Jel sev o7o74 u A PIG NEEFI ELECTFIG NIC EIJFIC PE N V t t d g e g n o 9 2 O J O A r w p o E l e g u r FIONEEFI ELECTFICINICA AUATFIALIA PTY LTc 1 7A 184 Boundanv troad B aes de Vicconi6 3 l95 Alst a ia o S E P T 1 9 7 5 Printedin Japan ...

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