Service Manuals, User Guides, Schematic Diagrams or docs for : Pioneer Audio MA-62 hfe_pioneer_ma-62_service
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SERVICE MANUAL MIXING AMPLIFIER MFEiE KL ()ProNEeR. MA-CiE! CONTENTS I.SPEC|F|CAT|ONS .....2 2. CONNECTION DIAGRAM .. ... 3 3. NAMES OF CONNECTORS ON THE BACK PANEL ...., 4 4.FRONTPANELFACILITIES ....5 5. BLOCK DIAGRAM ... 7 6.C|RCU|TDESCRTPTTON... .....9 7. LEVEL DIAGRAM .. .. . . . .11 S.DISASSEMBLY.. ....12 9. PARTS AND P.C. BOARD LOCATION . . .. .14 10. EXPLODED VIEW AND PARTS LIST . . . . .16 11. SCHEMATIC DIAGRAMS, P.C. BOARD PATTERNS AND PARTS LISTT 11.1 Circuit Connection Diagram and Miscellaneous Parts . . .19 11.2 Switch Circuit-B Assembly . . . .22 11.3 MicrophoneAmplifierAssembly ......23 11.4 SwitchCircuit-AAssembly ......33 12. PACKING METHOD AND PART NUMBERS ......36 ,1. SPECIFICATIONS SEMICONDUCTORS lCs... ........2 Transistors .....22 Diodes ........3 lnput Select: CH1, CH2: MIC i PHONO CH3, CH4, CH5, CH6: MIC / LINE Output Channel Select: CH1,CH2, CH5,CH6: L/ L& R / R CH3, CH4 (PAN-POT): L - R (Panoramic Potentiometer) I nput (Sensitivity/l mpedance) : MIC: 0.25mV l4.lkS]" PHONO: 2.5mV / 50kS) LINE: 50mV i 50kfi MIC Attenuator: 0dB, -20d8 MIC Overload Level: 250mV rms (at attenuator -20d8) PHONO Overload Level: 250mV rms (at ikHz) Output: Stereox 2 (parallel) Rated Output Level: 330mV Harmonic Distortion Less than 0.2o/o (at 1V output) Maximum Output: 5V (T.H.D.= 0.5%,50k0 load) Channel Separation: More than 70dB (at l kHz) Cross-talk: More than 70dB (at l kHz) Frequency Response: Mlc: 2}Hzto 15kHz (19d8) PHONO: R IAA Equalization: t0.5dB LINE: 2OHzto2SkHz(1?Oe) MIC Low Cut: fc- 2OOHz (6dB/oct.) Channel lnterference: Less than 1dB Residual Hum & Noise: Less than 0.05mV S/N (lHF, Short-Circuited, A Network) MIC: 52dB PHONO: 60dB LINE: 67dB Headphone Output: Maximum 260mV (8Sl) MISCELLANEOUS Power Requirements: AC 120V, 60Hz PowerConsumption: 5W Dimensions: 400tW) x 132(H) x 264(D) mm (15-3/4 x 5-3/16 x 10 3/8 in.) Weight: Without Package: 5.8k9, 13 lb With Package 7.3kq, 16 lb FURNISHED PARTS Connection Cordwith Pin Plus . . . . . . . 1 Operatinglnstructions ....... 1 NOTE: Specifications and the design subject to posslble modification without notice due to improvements. MA.EiE 2. CONNECTION DIAGRAM rrr SPEAKER SYSTEN4S STEREO TAPE DECK STEREO TAPE DECK LEFT CHANNEL RIGHT CHANNFI (for recording) (for playback) 'o' I ;tFF;:':l C oO Oo O. C e. Oec c OccO STER EO TURNTABLE INPUT TERMINALS (AUX) ,e-iai @ 0 ee e Q r"o*., :l i; F USE 120V mociei T--- i: ri ""t i lr t_: 1A I 5-Line Voltage model 0.5A 220v AC cord i 1A 240V 1 1 1 10V 20v 30v L-ry4\tr"-i iit i ft HF TT .ii:{ ] GROUND @ t:;:;:; MICROPHONES STEREO HEADPHONES ":'U:t" (for monitor) 3. NAMES OF CONNECTORS ON THE BACK PANEL LINE TNPUT TERMTNALS (CH 3, 4,5,6) HONO TNPUT TERMTNALS (CH 1,CH 2) Outputs from stereo tuners, from the recording output of This'set of terminals is for connecting a stereo turntable. a power amplifier, or from tape decks, are connected to You should use a moving magnet type phono cartridge. these inputs. MICROPHONE I NPUT TERMI NALS OUTPUT TERMTNALS ('.t, 2) Microphones should be connected to these iacks. !fn.r. outputs are for connecting to the inputs of a tape The MA-62 functions superbly whether you use low or or the auxiliary terminals of an amplifier. high impedance microphones. ldeck I There are two kinds of OUTPUT 2 terminals; the 5-pin The upper iacks are used to connect 5-pin DIN-type plugs iOtN type connector may be connected to a DIN plug of and the lower to connect usual phone type plugs. When in rape deck for recording. simultaneous connections to both terminal sets only the i lAt the same time, the input terminals of pre-amplifier may phone type jacks are operative. I be connectecJ to phono type terminals. I I l l I PHONES f ACK - - GROUND TERMINAL This jack is for stereo headphone connection. The lf the turntable used has a ground wire, it should be monitor function of the headphone will enable you to set connected to this terminal. a good balance between the input sources distributed to both stereo output channels. NOTE: l|e recommend the use of tightly fitting headphones such as Pioneer model SE-305 effective in sealing out the outside sound. MA-EiE! 6. CIRCUIT DESCRIPTION Signal Path 1. T'he signals from the microphone terminals 6. The output terminals have both phono jacks and the phono terminals (of channels 1 and and a DIN type connector. The two pairs 2 only) are amplified by the two NPN of phono jacks and DIN type connector are transistors in the direct coupled NFB-type wired in parallel, so they can be used simul- amplifier after selection with the input taneously, if necessary. switches. 7. The headphone output signal (for monitor- 2. Both the standard jacks and the DIN type ing purposes) is a portion of the output connectors can be used for the microphone which appears at the output terminals, am- inputs, but as the standard jacks defeat the plified by an integrated circuit. DIN connector, it is not possible to use the standard jacks when a microphone is con- nected to the DIN type connector for the The Microphone and Equalizer Amplifier same channel. Stage If two microphones are plugged into the Figure 1 is a simplified circuit diagram of the same channel at the same time, only the one plugged into the standard jack can be used. microphone/equalizer amplifier for channels 1 3. The amplified signals from the microphone and 2. The switching between the equalizer function and the mike amp function is effected or turntable are next fed to the resistors in by the switch marked S. the mixing stage through the slider type level The microphone input terminal has a sensitivity controls of each channel (except 3 and 4, which have pan-pots) and the output chan- of 0.25 mV while the phono input sensitivity is 2.5 mV at lkHz in each case, so altering the nel selector switch. gain by merely switching the CR element of the 4. The signals mixed by the resistors in the closed loop NFB would cause instability, which mixing stage are then amplified in the direct would lead to distortion and noise. coupled amplifier, by the PNP and the NPN transistors (2 transistors in all). Therefore, the amount of the current NFB 5. The signal taken from the NPN transistor from first stage transistor Q1 is changed by Sa, emitter (emitter follower) passes through the and the CR element is switched, to determine MASTER VOLUME potentiometer to be the frequency characteristics, by Sb. amplified in another two-transistor direct coupled amplifier and then sent to the output terminals from the emitter follower. OUTPUT INPUT PHONO-MlC PH0NO*MlC Fig. 1 Mixing Stage The mixing circuit of this unit is a very ortho- dox and highly stable series resistance circuit using isolation resistors. Resistors RMr thru RM6 in the diagram are such isolation resistors. The signals to be mixed are fed to terminals A thru F, and perfect mixing is obtained at point X in the diagram. If low resistance values are used as RM's, changes in the signal levels from each source may occur due to the different output impedances of the sources connected to A thru F. To prevent this, resistances of 33OkSl are used as RM's in this unit-differences due to output impedance are negligible. To prevent interference between the various signals, the impedance at point X (the mixing point) must be kept quite low in relation to the RM values. To fulfill this condition, parallel feed-type NFB is applied from the emitter of Qq to the base of Q: in the mixing ampli{ier. This not only helps to reduce distortion and noise (the effect of NFB), but also keeps the input impedance of Q3 verj low, maintaining stable operation. ) O cc o cr F (J F z o uJ J C) LU J a MIXING CIRCUIT (L CHANNEL) Lri F f RNF ui o- I L F l o L&R RM, RM, OUTPUT RMe RM, -RM6: ISOLATION RESISTORS (330k,f2) RNF: NFB RESISTOR (560ks-,) To Mixing Circuit (R Channel) Fig.2 10 MA.EiE 7. LEVEL DIAGRAM EOUA tI ZERl MIC AMP OUTPUT LINE HEADPHONES Mrc I j, I cb E $ .:- L HIADPHON E5 m -30 -O l4qnvl Z __l (o N !! -an I L! J l CD c (o 'f- I l I FREQUENCY AT 1kHz. 0dBV- 1V 11 8. DISASSE M BLY Removal of Side Panels (See Exploded Removing the Front Panel View.) 3. First, take off all the control knobs and 1. To remove the left and right side panels take slider caps, taking care not to lose the out the three securing screws as illustrated, springs from inside the individual level con- being careful not to lose the washers. trols and the master volume control. 4. Next, remove the two fixing screws at the Removing the Bottom Cover front of the front panel, and the four at the back. Do not forget to take off the rubber 2. After the side panels have been removed, feet at the back of the panel, as these two there are only two screws to take out before are attached with screws also. the bottom cover can be detached. Please refer to the exploded view below. $ (; "b., Fis. 3 T2 MA.CiE The Microphone Amplifier Assembly The Switch Assembly (B) 5. This assembly is removed by taking out the 7. Switch B ass'y may be removed once the six fixing screws as shown in the diagram four fixing screws have been taken out. (Figure 4). The Volume Controls The Switch Assembly (A) 8. The two-ganged volume controls and the 6. After the mike amp ass'y has been removed, slider volume controls may be removed in- the switch assembly (A) may be taken off. dividually, after the microphone amplifier Again, the six fixing screws must be removed assembly has been taken off, by unscrewing first. the securing nuts and setscrews in each case. SWITCH CIRCUIT- ASSEMBLY AWS-061-O 'ru -l I SWITCH CIRCUIT-A ASSEMB LY AWS-060-0 MICROPHONE AMPLIFIER ASSEMBLY AWM-056-0 Fis.4 13 9. PARTS AND P.C. BOARD LOCATION Top View VARIABLE RESISTOR (LEVEL) ACX-003-0 ROUND SHADING PLATE (A} AEC-132-0 ROUND SHADING PLATE (A) ROUND SHADING AEC-132-0 PLATE (B) AEC.133-A SHADING PLATE (A) AED-021-0 VARIABLE RESISTOR (PAN.POT) ACV-128-O PHONO JACK B (6 JACKS) AKB-017-0 HANDLE ANH.179-A PHONO JACK-A (4 JACKS) AKB-014-0 ROUND SHADING PLATE (A) AEC-132-0 FUSE HOI-DER AKR-020-0 PILOT LAMP BV, 50mA VARIABLE RESISTOR A E L-007-0 (MASTER) ACX-106-0 PUSH SWITCH (POWER) A SG-023-0 AC POWER CORD SHADING PLATE (B) ADG-O05-O AED-022-0 t4 MA-6E! Bottom View PO\AJER TRANSFORMER ATT-203-0 AC SOCKET AKP-002-0 PHONE JACK SWITCH CI RCU IT.B ASSEMB LY (HEADPHONES) AWS-061-0 K72-026-0 SWITCH CIRCUIT.A ASSEMBLY AWS-060-0 MIC AMPLIFIER ASSEMBLY BINDING POST AWM-056-A FOR GROUND AKE-0i 7-0 PHONE JACK SWITCH CIRCUIT.B ASSEMB LY (MICROPHONE) AWS-061-0 K72-O24-O 15 10. EXPLODED VIEW AND PARTS LIST NOTE: Any parts asterisked(* ) are sLrb ject to tleinq not supplierl Key No. Description Part No 1 Knob (LEVEL, MASTER) RAA 095.0 2 Spr i ng RBK 042 B 3 Knob (memory marker) R N K,042 A 4 Front panel assembly AN B-234 A 5 Knob {PAN'POT) AAB-072 0 Knob supporter AEC.136.4 l Bottom cover ANE-041 A B Foot AEC 135.A 9 Screur M4 x 26 ABA,O1 1 A 10 Side board iL) AMS OO5,A 11 Handle stay assembly (L) ANG 094 A 12 Switch circuit B assembly AWS O6i O 13 Switch circuit-B assembly AWS 061-0 14 Handle ANH,179 A 15 l\1ic amplif ier assembly AWM 056 A 16 Handle stay assembly (R) ANG 094 O 1l Round shading plate (B) AE C 33.A 1 t6 Rou nd shading plate (A) AEC 132 O 19 Shading plate (A) AED-021 0 20 Shadlng plate (B) AED O22-O 21" Chassis AN A-059 C 22' Shield plate ANH 181-0 Variable resistor 25OkJ)'AC (PAN-POT) ACV-128 0 24 Phone jack iMICROPHON E) K72 024.0 25 Insulator (washer) E32-045-A lb Phono jack'B (6 lacks) AKB 017-0 27 Phono jack A (4 jacks) AKB 014,0 Variable resisror 100kI),A2 (LEVE L) ACX,003-0 29 Variable resistor'1 00k{l'A2 (MASTER ) ACX 106-0 30 Phone jack (HEADPHONES) Kl2 026.0 31 Nut (insulator) 871 031-0 32 Washer (insulator) E34 014-0 Rubber gromnet AEB.O34-A 34 Pilot lamp BV, 5OmA AEL OO7 O 35 Binding post for ground AKE 017-0 36 Ground terrrinal strip (4P) K 13-047-0 31 Fuse holder (AC power) AK R-020 0 JO AC socket AKP 002,0 39 AC socket-held metal l\n49 121,A 40 AC power cord ADG OO5 O 41 AC cord grommet AEC 079-0 42 Side boarcl (R ) AMS 006 A 43 Knob (PO''\tER) AAD,045 0 44 Push switch (POWER ) ASG 023-0 45'. P.C. board lrolder AN F-177 0 46 Switch circu it'A asse{nblV AWS 060,0 41 Pon,er transfonrer ATT-203 0 48 Connector {DlN tVpe 5P) K93 003 B 16 MA.EiE RESISTORS Symbol Description Part No. R1 Carbon film ik R D'l.PS 1 O2J R2 Carbon f ilm 1k RD%PS 1O2J R3 Carbon film 91k RD74PS 9'1 3J R4 Carbon film 91 k RD%PS 913J R5 Carbon f ilm 180k RD%PS 184J R6 Carbon f ilm 180k RD%PS 184J R7 Carbon film 3k RD%PS 302J R8 Carbon film 3k RD%PS 3O2J R9 Carbon f ilm 120k RD74PS 124J R10 Carbon film 12Ok RD%PS 124J R11 Carbon film 6B0k RD%PS 684J R12 Carbon film 680k RD%PS 684J R13 Carbon film 47k RD%PS 473J R14 Carbon film 41k R D7.PS 473J R15 Carbon film 22Ok RD%PS 224J R16 Carbon film 22Ok RD%PS 224J R17 Carbon f ilm 1.5k '1 R D% PS 52J R18 Carbon f ilm 1.5k RD%PS 152J R19 Carbon film 39k RD7"PS 393J R20 Carbon film 39k RD%PS 393J R21 Carbon film 300k RD7.PS 3O4J R22 Carbon film 3O0k RD%PS 3O4J R23 Carbon film 4.3k RfJ%PS 432J R24 Carbon film 4.3k RD7.PS 432J R25 Carbon film lBk RD%PS,183J fi 2t) Carbon film lBk RD%PS 183J R2l Carbon f ilm 1k RD%PS 1O2J R28 Carbon f ilm 1k RD7.PS 1O2J R29 Carbon film 68k RD%PS 683J R30 Carbon f ilm 68k R DIAPS 683J R31 Carbon film 2.2k RD./"PS 222J o1a Carbon film 2.2k RD%PS 222J R33 Carbon f ilm 1k RD%PS 1O2J R34 Carbon f ilm 1k RD%PS 1O2J D2t Carbon f ilm 9'1 k RD74PS 913J R36 Carbon f ilm 91k RD%PS 91 3J R37 Carbon film 180k RD%PS 184J R38 Carbon film 180k RD%PS 184J R39 Carbon f ilm 1k RD74PS 1O2J R40 Carbon f ilm 1k RD74PS iO2J R41 Carbon {ilm 12Ok RD%PS 124J R42 Carbon f ilm 120k RD%PS 124J R43 Carbon film 22Ok RDY^PS 224J R44 Carbon film 22Ok RD%PS 224J R45 Carbon film 3O0k RD7.PS 3O4J R46 Carbon film 30Ok RD74PS 3O4J R4l Carbon film 2.lk RDY"PS 272J R48 Carbon film 2.1k RD%PS 212J R49 Carbon film 18k RD%PS 183J R50 Carbon f ilm '18k RD%PS 183J ConlinLred on ltre Nexl Pdqe 29 MICROPHONE AMPLI FIER ASSEMBLY Symbol Description Part No. R51 Carbon film 68k RD%PS 683J H5l Carbon film 68k RD%PS 683J R53 Carbon film 22k RD%PS 222J R54 Carbon film 2.2k RD%PS 222J R55 Carbon film 1k R Dil4PS 1O2J R56 Carbon f ilm 1k RD%PS 1O2J R57 Carbon f ilm 91k RD%PS 913J R58 Carbon f ilm 91k RD%PS 913J R59 Carbon film 1BOk RD%PS 1B4J R60 Carbon f ilm 180k RD%PS 184J R61 Carbon f ilm 1k RD%PS 1O2J R62 Carbon f ilm 1k RD%PS 1O2J R63 Carbon f ilm 120k RD%PS 124J R64 Carbon f ilm '1 20k RD%PS 124J R65 Carbon film 22Ok RD%PS 224J R66 Carbon film 22Ok RD%PS 224J R67 Carbon film 300k RD%PS 3O4J R68 Carbon film 300k RD%PS 3O4J R69 Carbon f ilm 2.lk RD%PS 2]2J R70 Carbon film 2.lk RD%PS 2]2J R71 Carbon film 18k RD%PS 183J R72 Carbon film 18k RD%PS 183J R73 Carbon film 68k RD%PS 683J Rl4 Carbon film 68k RD%PS 6B3J R75 Carbon film 2.2k RD%PS 222J R76 Carbon film 2.2k RD%PS 222J R77 Carbon f ilm 33Ok RD%PS 334J R78 Carbon film 330k RD%PS 334J R79 Carbon film 330k RD%PS 334J R80 Carbon film 330k R D74PS 334J R81 Carbon film 330k RD%PS 334J R82 Carbon f ilm 330k RD%PS 334J R83 Carbon {ilm 330k RD%PS 334J R84 Carbon film 330k RD%PS 334J R85 Carbon film 330k RD%PS 334J R86 Carbon film 330k RD%PS 334J R87 Carbon film 330k RD74PS 334J R88 Carbon film 330k RD%PS 334J R89 Carbon film 2.2k RD%PS 222J R90 Carbon film 2.2k RD%PS 222J R91 Carbon film 2.2M RD%PS 225J R92 Carbon film 2.2M RD%PS 225J R93 Carbon film 1.2M R D%PS ,1 25J R94 Carbon f ilm 1.2M RD%PS 125J R95 Carbon film 360k RD%PS 364J R96 Carbon f ilm 360k RD%PS 364J R97 Carbon f ilm 1.5k RD%PS 152J R98 Carbon f ilm I.5k RD%PS 152J R99 Carbon f ilm 62k RD%PS 623J R 100 Carbon film 62k RD%PS 623J 30 MICROPHONE AMPLI FI ER ASSEMBLY MA-EiE Parts List of Switch Circuit-A Assembly (AWS-060-0) CAPACITORS Symbol Description Part No. C1 Mylar 0.018 50V COIVIAl 83K 50 C2 Mylar 0.018 50V COMA183K 50 C3 Mylar 0.018 50V COMAl83K 50 C4 Mylar 0,018 50V COMA183K 50 C5 Mylar 0.018 50V COMA183K 50 C6 Mylar 0.018 50V coMA183K 50 RESISTORS Symbol Description Part No. R1 Carbon film 4lO RD%PS 471J R2 Carbon film 4.lk RD%PS 412J R3 Carbon film 47O RD%PS 47iJ R4 Carbon film 4.1k RD%PS 472J R5 Carbon film 4'7O RD%PS 471J R6 Carbon film 4.1k RD%PS 4]2J R7 Carbon film 4lO RD%PS 471J nd Carbon film 4.lk RD%PS 412J R9 Carbon film 41O RD%PS 471J R'1 0 Carbon film 4.1k RD%PS 412J R'1 1 Carbon film 47O RD%PS 471J R12 Carbon film 4.1k RD%PS 4]2J SWITCHES Symbol Description Part No. S1 Slide switch (INPUT) ASH-010-0 et Slide switch (INPUT) ASH-010,0 S3 Slide switch (INPUT) ASH-009-0 S4 Slide switch (INPUT) ASH-009,0 CA Slide switch (INPUT) ASH-009-0 S6 Slide switch (INPUT) ASH-009-0 S7 Slide switch (MlC LOW-CUT) ASH,009-0 S8 Slide switch iMlC LOW-CUT) ASH-009-0 S9 Slide switch iMlC LOW-CUT) ASH,009,0 s10 Slide switch (MlC LOW-CUT) ASH-009-0 s1 1 Slide switch (MlC LOW-CUT) ASH-009-0 s12 Slide switch (MlC LOW-CUTi ASH-009-0 s13 Slide switch (MlC ATTENUATOR) ASH-009-0 s14 Slide switch (MlC ATTENUATOR) ASH-009-0 s15 Slide switch (MlC ATIENUATOR) ASH-009-0 s16 Slide switch (MlC ATTENUATOR) ASH-009,0 s17 Slide switch (MlC ATTENUATOR) ASH-009-0 s18 Slide switch {MlC ATTENUATOR) ASH-009-0 35 12. PACKING METHOD AND PART NUMBERS CAR DBOA RD AHB-015-0 SIDE PAD (L) AHA-044-0 VINYL COVER AHG 016-0 SIDE PAD (R) AHA,045,0 CLOTH BAG AHG-017-0 (Cover MA-62) PACKING CASE AHD-2i 0-0 Jr) PIONEEFI ELECTFI(fNIC COFII'OFIATION , I Cirome, Meguno, Meguno,ku, Tokyo 1 53, Japa. :1- 1 U.S. FIONEEF| ELECTFIONICA COFIPC'F|ATEN 75 Oxfo.d Dtrrve, Moonach e, New Jensey O7O7.4,U.S.A. PIONEEFI ELECTFIONIC (EUFIOPEI N.V. Mern-Cencen Mern 2-T, 2OOO A-twenp. Betgrum PIONEEFI ELECTFIONICEi AIJSTFIALIA PTY. LTEI. 256-A C tV trload South Me bou.ne. V ctonra 3205. Arrsrna a o sEP. 1974 Printed in Japan
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