SERVICE MANUAL
Contents
1. LE es XL Ay 300K Ol H 2 Es e S 4t ee 00 Ca 100 35 BE Cane Bos alia BL 22K P TN SWITCH j LI gt 2SA725 AWS 080 DEE n pip 48 39 QERA SERE iz SWITCH ASSY 8 AWS 061 REENEN DEE et 9n eme or 28A T EZ e 4 dy 2581344 02801344 47 UT or 2801312 or 2561312 66 5 50 AWM 056 1 E 02861312 gt 93 0 l RoaS30K SE E x al E 2SC1 AT 538 ee 1 Cm l Ble 4 at amp I E Rt 22 25 al BS r Ger ez Me st Para Sak mav E ki a 44 2 Bl W Je 2284 5 be Ca3 3 10 ART Rm330K 96 zh Cus Rg4K 47 25 ave 0 E GAV als 8 Si GEN a 8 lt 3P 8 190735 elf Cu 22 Ca22725 45 Rag 330K sic ls 275 ai ar ES AES TAN 242N 25 945 yn epa HEADPHONE QUT V 2SA763P an A 24 0V Beni 242 24 IV Lease 2 SE Sal B o lt SIT na 4305 RA Cn Rm El DEE m Besch 4 20 C osa 2861944 5 BRE AU p E or 2561312 Pow Ton A2. O 56 Y a KK r 23 MA 62 Foil Side AWM 056 A GA 25 1344 Ze 330K Pd R84 330K Rsz 330K mI Be 66 25 26 Parts List of Microphone Amplifier Assembly AWM 056 A CAPACITORS Symbol Description C1 C2 C3 CA C5 C6 C7 C8 C9 2T Electrolytic Electrolytic Ceramic Ceramic Electrolytic Electrolytic Styrol Styrol Styrol Styrol Ceramic Ceramic Ceramic Ceramic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Electrolytic 3 3 3 3 100p 100p 47 47 Part No CSSA 3R3X 10 CSGA 3R3X 10 CCDSL 101K 50 CCDSL 101K 50 CEA 470P 16 CEA 470P 16 COSA 562G 50 COSA 562G 50 COSA 162G 50 COSA 162G 50 CCDSL 100F 50 CCDSL 100F 50 CCDSL 220K 50 CCDSL 220K 50 CEA 471P 6 471P 6 CSSA 2R2X 25 CSSA 2R2X 25 CSSA 2R2X 25 CSSA 2R2X 25 CEA 101P 35 CEA 101P 35 CSS
3. 38 48 49 39 poc lt lt lt lt emm 7 37 2SC134 4 0 2501344 25 125 sim Ss 255 Ese 3 Eben 1 oie dee Si 215 o uo Om 2 ax Rig BOK 22 25 bie 34 A E Res Ro ma OS 33 K vlt 12 1 LAS 32 1 25 12 7V VA Qe d t 51 A 2561344 41K 41 25 31 2 2 Cn Sot NS O23 ost l 8 E 66 2 NNN o oQ T q Ras 1K 2424 R 24 2 AV kiy mir 2 241 255 pS Sls om TA7066P se ba Ze co Cu 220 35 cm Be 32m 29 4 Ss sz 0 ar ET 26 330K hibe 560K 5 855 be H 2801344 4 IK 47 25 s ie 136 E AA 121v 7 He GP I Reo 330K NE a 22 8V 28 2 AAA H D e ben 43 Re Mok Rep 2 2K Ca 1 25 NS LAN e 153 De 2501344 lt J8OK 22 25 E E Siok 229 n 84 x Ps x E an g 2 3 5 1 2SAT2S P cm ESS W oy i Bee 330K y Pat 8 2 3 oz ma z l1 la 380K Qa 2501344 so b 47 S ch e 25 0V E Q 250313 51801 ANN 4 F ss N NN On Rigg 2 2K Rus 2 2K Cos 0 01 V 2 z t1S 3 az 8 E Ot so 8 27 756945 Ach S 2 cc 55
4. 680k 680k 47k 47k 220k 220k 1 5k Tbe 39k 39k 300k 300k 4 3k 4 3k 18k 18k 1k 1k 68k 68k 2 2 2 2k 1k 1k 91k 91k 180k 180k 1k 1k 120k 120k 220k 220k 300k 300k 2 7K Zk 18k 18k MICROPHONE AMPLIFIER ASSEMBLY RDAPS 184J RD4PS 302 302J RD PS 124 RDAPS 124J RDPS 684 5 684 RDAPS 473 RDAPS 473 RD 4PS 224 RD PS 224 5 152 RDAPS 152 RD 4PS 393 RO APS 393 304J 3044 RDAPS 432 432 183 RDWPS 183 RD PS 102 RDAPS 102 5 683 683 RDAPS 2225 RDA4PS 222 RD4PS 102 RDAPS 102J RDPS 913 RD PS 913 RDAPS 184J RDA4PS 184J RD4PS 102J RD4PS 102 RD PS 124J RDAPS 124 2245 RD4PS 224 RD4PS 304 RDPS 304 2725 272 RD PS 183 RD PS 183 Continued on the Next Page 29 Symbol Description Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon fil
5. PHONE JACK MICROPHONE K72 024 0 SWITCH CIRCUIT B ASSEMBLY AWS 06 1 0 15 NOTE Any parts asterisked are subject to being not supplied Description 10 EXPLODED VIEW AND PARTS LIST Part No Knob LEVEL MASTER Spring Knob memory marker Front panel assembly Knob PAN POT Knob supporter Bottom cover Foot Screw M4 x 26 Side board L Handle stay assembly L Switch circuit B assembly Switch circuit B assembly Handle Mic amplifier assembly Handle stay assembly R Round shading plate B Round shading plate A Shading plate A Shading plate B Chassis Shield plate Variable resistor 250k amp AC PAN POT Phone jack MICROPHONE Insulator washer Phono jack B 6 jacks Phono jack A 4 jacks Variable resistor 100 0 2 LEVEL Variable resistor 100k amp A2 MASTER Phone jack HEADPHONES Nut insulator Washer insulator Rubber gromnet Pilot lamp 8V 50mA Binding post for ground Ground terminal strip 4P Fuse holder AC power AC socket AC socket held metal AC power cord AC cord grommet Side board R Knob POWER Push switch POWER P C board holder Switch circuit A assembly Power transformer Connector DIN type 5P RAA 095 0 RBK 042 B RNK 042 A ANB 234 A AAB 072 0 AEC 136 A ANE 041 A AEC 135 A ABA 011 A AMS 005 A ANG 094 A AWS 06 1 0 AWS 061 0 ANH 179 A AWM 056 A ANG 094 0 AEC 133 A AEC 132 0 AED
6. 4 Era Ei ex i _ TE CH 5 O Lr K D T M M T wc 025mV FREQUENCY AT 1kHZ OdBV 1V 80 bi 8 DISASSEMBLY Removal of Side Panels See Exploded View 1 To remove the left and right side panels take out the three securing screws as illustrated being careful not to lose the washers Removing the Bottom Cover 2 12 After the side panels have been removed there are only two screws to take out before the bottom cover can be detached Please refer to the exploded view below Removing the Front Panel 3 BOTTOM COVER First take off all the control knobs and slider caps taking care not to lose the springs from inside the individual level con trols and the master volume control Next remove the two fixing screws at the front of the front panel and the four at the back Do not forget to take off the rubber feet at the back of the panel as these two are attached with screws also Fig 3 The Microphone Amplifier Assembly 5 This assembly is removed by taking out the six fixing screws as shown in the diagram Figure 4 The Switch Assembly A 6 After the mike amp ass y has been removed the switch assembly A may be taken off Again the six fixing screws must be removed first SWITCH CIRCUIT B ASSEMBLY AWS 061 0 MI
7. amp Lag E 231 ma 030K 22 cans Yi r 29 x CH Ka w om z T 815 Me 250313 es E E LR 0 7 W apes Gn 2SATI25 cn b 2561344 AR or 2SA763 or 2861312 Sas TD nam E t 37 is D R 0UT O D gs 2561344 ell 8 1 or 2801312 E r A 250v LINE 4 SIBO1 02 6 6 Ryo 2a 280313 aav 0 07198866 35 3e 37 H el TA P MIC AMP ASSY p S gt 1 E i y 01 0 2861344 AWM 056 m ate or 2SC1312 in 5 5 pr s E 5 ala n SIBOI 02 or 58856 y nL 1234567 y Ge Sig Cuin s a DT AW 05 DES YELLOW T 120V Ka aot UNSWITCHED BOHz apii anog ROC r LINE AG 10 FUSE 2 EE DT 120V Only model C 0 01 240V SWITCH ASSY B a 50750Ha 2501344 P or 2861312 VRs 100K A 5 Line voltage model ER y d e 5 2 EEX AWM DSB p edis _ SWITCH RESISTORS GER S S2 INPUT SELECTOR IN OHM Wu 595 TOLERANCE UNLESS OTHERWISE NOTED 1 MIC 2 PHONO bw Sa Sg INPUT SELECTOR LMC 2 LINE CAPACITORS Sa Sa LOW CUT FILTER iN F UNLESS OTHERWISE NOTED LOFE 2 0 p PF MIC ATTENUA
8. 021 0 AED 022 0 ANA 059 C ANH 181 0 ACV 128 0 K72 024 0 E32 045 A AKB 01 7 0 AKB 014 0 ACX 003 0 ACX 106 0 72 026 0 B71 031 0 E34 014 0 AEB 034 A AEL 007 0 AKE 017 0 K13 047 0 AKR 020 0 AKP 002 0 M49 127 A ADG 005 0 AEC 079 0 AMS 006 A AAD 045 0 ASG 023 0 ANF 177 0 AWS 060 0 ATT 203 0 K99 003 B MA 62 requested to amend parts number in this manual according to the Parts number is subject to change for the purpose of improvement instructions with notice of a service bulletin Service bulletin will be furnished whenever necessary and you are NOTE S gt Es 11 SCHEMATIC DIAGRAMS PC BOARD PATTERNS AND PARTS LIST 11 1 CIRCUIT CONNECTION DIAGRAM AND MISCELLANEOUS PARTS lt 6 4 de 0 a S AWM 056 74 s C 0 0016 gt D 92 Da 2561344 0 2561312 5 Boa H 1 H
9. A 3R3X 10 CSSA 3R3X 10 CCDSL 101K 50 CCDSL 101K 50 CCDSL 100F 50 CCDSL 100F 50 CCDSL 220K 50 CCDSL 220K 50 CEA 471P 6 CEA 471P 6 CSSA 2R2X 25 CSSA 2R2X 25 CEA 101P 35 CEA 101P 35 CSSA 3R3X 10 CSSA 10 CCDSL 101K 50 CCDSL 101K 50 CCDSL 100F 50 CCDSL 100F 50 CCDSL 220K 50 CCDSL 220K 50 CEA 471P 6 MICROPHONE AMPLIFIER ASSEMBLY Description Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Electrolytic Electrolytic Mylar Mylar Electrolytic Electrolytic Mylar Mylar Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Mylar Mylar Electrolytic Ceramic Electrolytic Electrolytic Electrolytic Ceramic Ceramic Part No 470 2 2 2 2 100 100 0 47 0 47 10 10 2 2 2 2 CEA 471P 6 CSSA 2R2X 25 CSSA 2R2X 25 CEA 101P 35 CEA 101P 35 CSSA R47X 25 CSSA R47X 25 CEA 100P 16 CEA 100P 16 CSSA 2R2X 25 CSSA 2R2X 25 CEA 221P 35 CEA 221P 35 CSSA 010X 25 CSSA 010X 25 CEA 4R7P 25 CEA 4R7P 25 CSSA 2R2X 25 CSSA 2R2X 25 CEA 221P 35 CEA 221P 35 CCDSL 101K 50 CCDSL 101K 50 CCDSL 101K 50 CCDSL 101K 50 CCDSL 390K 50 CCDSL 390K 50
10. CEA 4R7P 25 CEA 4R7P 25 CQMA 102K 50 COMA 102K 50 CEA 100P 25 CEA 100P 25 COMA 102K 50 COMA 102K 50 CEA 330P 16 CEA 330P 16 CEA 470P 16 CEA 470P 16 CEA 101P 25 CEA 101P 25 COMA 183K 50 COMA 183K 50 CEA 101P 25 CKDYF 473Z 50 CEA 471P 50 CEA 471P 50 CEA 471P 50 ACG 004 0 ACG 004 0 MICROPHONE AMPLIFIER ASSEMBLY RESISTORS Symbol R1 R2 R3 R4 R5 R6 R7 R8 R9 R11 R12 R13 R14 R16 R17 R18 R19 R21 R22 R23 R24 R26 R27 R28 R29 R31 R32 B33 R34 R36 R37 R38 R39 R41 R42 R43 R44 R46 R47 R48 Description Carbon film 1k Carbon film 1k Carbon film 91k Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Part No MA 62 91k 180k RDPS 102 102 5 913 913 RD PS 184 180k 3k 3k 120k 120k
11. CROPHONE AMPLIFIER ASSEMBLY AWM 056 0 MA 62 The Switch Assembly B 7 Switch B assy may be removed once the four fixing screws have been taken out The Volume Controls 8 The two ganged volume controls and the slider volume controls may be removed in dividually after the microphone amplifier assembly has been taken off by unscrewing the securing nuts and setscrews in each case SWITCH CIRCUIT A ASSEMBLY AWS 060 0 Fig 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 ROUND SHADING PLATE A PLATE B AEC 132 0 AEC 133 A SHADING PLATE A AED 021 0 VARIABLE RESISTOR PAN POT ACV 128 0 PHONO JACK B 6 JACKS AKB 017 0 HANDLE ANH 179 A PHONO JACK A 4 JACKS X AKB 014 0 ROUND SHADING PLATE A AEC 132 0 FUSE HOLDER AKR 020 0 PILOT LAMP 8V 50mA AEL 007 0 PUSH SWITCH POWER ASG 023 0 VARIABLE RESISTOR MASTER ACX 106 0 AC POWER CORD SHADING PLATE B ADG 005 0 AED 022 0 14 MA 62 Bottom View POWER TRANSFORMER AT T 203 0 AC SOCKET AKP 002 0 PHONE JACK HEADPHONES K72 026 0 SWITCH CIRCUIT B ASSEMBLY AWS 06 1 0 SWITCH CIRCUIT A ASSEMBLY AWS 060 0 MIC AMPLIFIER ASSEMBLY BINDING POST AWM 056 A FOR GROUND AKE 017 0 ecce PO BESE HENE
12. D SERVICE MANUAL MIXING AMPLIFIER MA 62 PIONEER MA 62 CONTENTS 1 SPECIFICATIONS modo O a 2 2 CONNECTION DIAGRAM 3 3 NAMES OF CONNECTORS ON THE BACK PANEL 4 4 FRONT PANEL FACILITIES 5 5 BLOCK DIAGRAM 7 B CIRCUIT DESCRIPTION ass a aa cet ee eee ek RAWD m m a nes Kan 9 7 LEVEL DIAGRAM k A NEE kw EN OOS SOROR EWN 11 B DISASSEMBLY coi cia a eGo FWYD Aa a EEN GR DUR 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 Microphone Amplifier Assembly 23 11 4 Switch Circuit A Assembly 33 12 PACKING METHOD AND PART NUMBERS 36 1 SPECIFICATIONS SEMICONDUCTORS Qv M Genet 2 ses 8 A8 si AE RES 22 Diodes a Input Select CHT CH MIC PHONO CH3 CH4 CHE MIC LINE Output Channel Select CHT CH2 CHG L L amp R HB CH3 CHA PAN POT Inp
13. IDE PAD R AHA 045 0 CLOTH BAG AHG 017 0 Cover MA 62 PACKING CASE AHD 210 0 36 PIONEER ELECTRONIC CORPORATION 4 1 1 Chome Meguro Meguro ku Tokyo 153 Japan U S PIONEER ELECTRONICS CORPORATION 75 Oxford Drive Moonachie New Jersey 07074 U S A PIONEER ELECTRONIC EUROPE N V Meir Center Meir 21 2000 Antwerp Belgium PIONEER ELECTRONICS AUSTRALIA PTY LTD 256 8 City Road South Melbourne Victoria 3205 Australia SEP 1974 Printed in Japan
14. S BONONIE When you wish to cut unwanted low frequency portions of the signal flip the MIC LOW CUT switch on When you are feeding in a signal from a microphone and the sound source just exceeds the range of the micro phone the MIC LOW CUT switch serves to cut the bass part of the sound so that its clarity is improved considerably vc Uon Mio Levene BNET e Low ee uaW GE ni EREK PIONEER H MIXING AMPLIFIER al Q AF TENOATOR UU e e model SA Lace MiG e ATTENUATOR e o MASTER THE PAN POT ATTENUATOR SWITCHES When these switches are put into the 20dB position they reduce the microphone input level by 20dB Naturally if the loudness of the source is too great for the level setting or for the microphone distortion may occur in the amplifier section of the MA 62 mixer so you should estimate the maximum level and set the controls for that maximum in order to obtain optimum results MA 62 PILOT LAMP POWER SWITCH PANORAMIC POTENTIOM ETER CONTROLS The PAN POTs adjust the output from input sources CH 3 and CH 4 They continuously change the distribution of sound volume appearing at the output terminals When the power switch is pushed the power comes on and the pilot lamp is illuminated To turn off push th
15. SAS AMPLIFIER O oO Oo 0 0 T bie ka sagas z r 299 9 CH6 il I l INPUT TERMINALS AUX cus H CHA H S ll CH3 INE CH2 OUTPUT CORDS d CHI _ M FUSE gt Kam 5 Line Voltage mode 05A 220V 240V 110V 120V AC cord 130V i ji i H GROUND MICROPHONES STEREO HEADPHONES for monitor 3 NAMES OF CONNECTORS ON THE BACK PANEL LINE INPUT TERMINALS CH 3 4 5 6 4 Outputs from stereo tuners from the recording output of a power amplifier or from tape decks are connected to these inputs OUTPUT TERMINALS 1 2 These outputs are for connecting to the inputs of a tape deck or the auxiliary terminals of an amplifier There are two kinds of OUTPUT 2 terminals the 5 pin DIN type connector may be connected to a DIN plug of tape deck for recording At the same time the input terminals of pre amplifier may be connected to phono type terminals PHONES JACK n o This jack is for stereo headphone connection The monitor function of the headphone will enable you to set a good balance between the input sources distributed to both stereo output channels NOTE We recommend the use of tightly fitting headphones such as Pioneer mo
16. Switch circuit A assembly Switch circuit B assembly Phono Jack A 4 jacks Phono Jack B 6 jacks Binding post for ground Power transformer Pilot lamp 8V 50m A Fuse 1A AC power Push switch POWER AC socket Fuse holder AC power Phone jack HEADPHONE Phone Jack MICROPHONE Connector DIN type 5P AC power cord Operating instructions Connection cord AWM 056 A AWS 060 0 AWS 06 1 0 AKB 014 0 AKB 017 0 AKE 017 0 ATT 203 0 AEL 018 0 AEK 106 0 ASG 023 0 AKP 002 0 AKR 020 0 K72 026 0 K72 024 0 K93 003 B ADG 005 0 ARB 098 A ADE 005 0 RESISTORS Description Carbon film 200k Carbon film 47k Carbon film 200k Carbon film 47k Carbon film 200k Carbon film 47k Carbon film 200k Carbon film 47k SWITCHES Symbol Description 1 Slide switch OUTPUT 2 Slide switch OUTPUT 21 RDAPS 204J RDAPS 473 RDAPS 204 RDAPS 473 RD PS 204 RD PS 473 RD PS 204 RDAPS 473 Part No ASH 01 1 0 ASH 01 1 0 MA 62 11 3 690K Ru 47K m K 10P 7 4 10 13 140 9 11 e 129 2 K C 33 10 5 Cz e MICROPHONE AMPLIFIER ASSEMBLY AWM 056 A
17. TOR T j nEn t Log 2 20dB Cup Qu Giz 2561344 8 N KO NOTES or 28C1312 3 Sa ROWER i oy SIGNAL VOLTAGE NECESSARY FOR OBTAINING Gi 1 OFF 2 ON 330 mV OUTPUT KHZ HE NEN lt gt DC VOLTAGE AT NO INPUT SIGNAL VV See POTENTIOMETERS lt A DC CURRENT AT NO INPUT SIGNAL D VA VRg LEVEL CONTROL n TN MASTER VOLUME f 87v VRa PAN C220 dx Ca 2 225 27 a hs i AWM OSG E Fn To 19 Miscellaneous Parts CAPACITORS Symbol CAPACITORS IN uF UNLESS OTHERWISE NOTED pF e RESISTORS IN 9 AW UNLESS OTHERWISE NOTED M Description Part No C1 C2 C3 C4 C5 C6 Ceramic 0 01 Ceramic 0 01 Ceramic 0 01 Ceramic 0 01 Ceramic 0 01 Ceramic 0 01 POTENTIOMETERS Description ACGO01 0 ACG 003 0 CKDYF 103Z 50 CKDYF 103Z 50 CKDYF 103Z 50 CKDYF 103Z 50 Part No 11 2 SWITCH CIRCUIT B ASSEMBLY AWS 061 0 OTHERS Variable resistor 100k A2 LEVEL Variable resistor 100k A2 LEVEL Variable resistor 100k A2 LEVEL Variable resistor 100k A2 LEVEL Variable resistor 100k A2 LEVEL Variable resistor 10Qk A2 LEVE L Variable resistor 100k A2 MASTER Variable resistor 250k AC PAN POT Variable resistor 250k AC PAN POT Description ACX 003 0 ACX 003 0 ACX 003 0 ACX 003 0 ACX 003 0 ACX 003 0 ACX 106 0 ACV 128 0 ACV 128 0 Part No Microphone amplifier assembly
18. del SE 305 effective in sealing out the outside sound HONO INPUT TERMINALS CH 1 CH 2 This set of terminals is for connecting a stereo turntable You should use a moving magnet type phono cartridge m MICROPHONE INPUT TERMINALS Microphones should be connected to these jacks The MA 62 functions superbly whether you use low or high impedance microphones The upper jacks are used to connect 5 pin DIN type plugs and the lower to connect usual phone type plugs When in simultaneous connections to both terminal sets only the phone type jacks are operative GROUND TERMINAL f the turntable used has a ground wire it should be connected to this terminal 4 FRONT PANEL FACILITIES INPUT SELECTOR SWITCHES These switches are to select the various program sources connected to the terminals on the back panel of the MA 62 CH 1 and CH 2 MIC When microphones are being used as a source PHONO When a turntable is being used as a source CH3 CH4 CH5 and CH6 MIC When microphones are used as a source LINE When tape decks tuners and suchlike are used as sources OUTPUT CHANNEL SELECTOR SWITCHES CH 1 CH 2 CH 5 CH 6 These switches select the output channels for each input L The input source appears at the left output terminals R The input source appears at the right output terminals L amp R The input source appears at both the left and right output terminals MIC LOW CUT SWITCHE
19. e power switch again the power will be shut off and the lamp will go out r MEMORY MARKERS e NY FFEFRYN Eege Setting the MEMORY MARKERs to which the MASTER VOLUME and INPUT LEVEL control settings correspond can easily remind you of the level positions later Also convenient for memorizing optimum levels even if the levels are changed by these controls r MASTER VOLUME CONTROL The MASTER VOLUME control sets the level of the output volume It is advisable to usually set the control at about 6 7 on the scale With the level controls of the MA 62 properly adjust each of inputs of tape deck and pre amplifier to which the MA 62 is connected N PUT LEVEL CONTROLS These controls are used to adjust each of inputs from input terminals When the input level is low the INPUT LEVEL controls should be raised and when the input is high it should be lowered 5 BLOCK DIAGRAM 9 5 52 16 PHONO 51 1 MIC amp PHONO EQ AMP CH 1 d MIC 0 25mV FLAT AMP FLAT AMP OUTPUT L CH 1 330mV 2 VR7 a HEADPHONE AMP OUTPUT R CH VR7 b SWITCHES 1 MIC ATTENUATOR OdB 20dB Sa INPUT MIC PHONOor MIC LINE S3 LOW CUT FILTER OFF ON 54 OUTPUT L L amp R R POTENTIOMETERS VRi VRe LEVEL CONTROL VR MASTER VRe VR9 PAN POT 6 CIRCUIT DESCRIPTION Signal Path 1 The signals from the microphone termi
20. e headphone output signal for monitor ing purposes is a portion of the output which appears at the output terminals am plified by an integrated circuit The Microphone and Equalizer Amplifier Stage Figure 1 is a simplified circuit diagram of the microphone equalizer amplifier for channels 1 and 2 The switching between the equalizer funetion and the mike amp function is effected by the switch marked S The microphone input terminal has a sensitivity of 0 25 mV while the phono input sensitivity is 2 5 mV at 1kHz in each case so altering the gain by merely switching the CR element of the closed loop NFB would cause instability which would lead to distortion and noise Therefore the amount of the current NFB from first stage transistor Q1 is changed by Sa and the CR element is switched to determine the frequency characteristics by Sb INPUT OUTPUT PHONO lt MIC PHONO lt gt MIC 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 RM thru RM 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 resi
21. film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film 100k 22k 22k 560k 560k 47k 47k 33k 33k 5 6k 5 6k 33k 33k 4 7k 4 7k 180k 180k 100 100 47k 47k 1 2k 1 2k 47k 47k 10k 10k 680 680 120 120 100 100 1k 1k 150 270 1k 1k 3 3k 3 3k 3 3k 2 2k 2 2k MICROPHONE AMPLIFIER ASSEMBLY RDAPS 104 RD PS 223 5 223 RD4PS 564J RD APS 564J RD PS 473 RDAPS 473 RD PS 333 RD APS 333 RD4PS 562J RDAPS 562 5 333 RDZPS 333 RDAPS 472 RDXPS 472 RDXPS 184 RD4PS 184 RD PS 101 RDXPS 101 RD1 4PS 473 RD4PS 473 5 122 5 1225 5 473 5 473 RDAPS 103 5 103 5 681 RDAPS 681 RDAPS 121 5 121 RDAPS 101 RDAPS 101 RDAPS 102 5 1025 5 151 RDAPS 271 5 102 RDAPS 102 RDAPS 332 RDAPS 332 RD PS 332 RDAPS 2225 RD PS 222 al Transistor Transistor Transistor Transistor Transistor Transisto
22. ion RESISTORS Description SWITCHES Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Description 0 018 0 018 0 018 0 018 0 018 0 018 470 470 Slide switch INPUT Slide switch INPUT Slide switch INPUT Slide switch INPUT Slide switch INPUT Part No nb SW COMA183K 50 COMA183K 50 COMA183K 50 COMA183K 50 COMA183K 50 COMA183K 50 Part No 471 RD PS 472 5 471 5 472 RDAPS 471 RDAPS 472 RDAPS 471 RD4PS 472 RD4PS 471 5 472 RD PS 471 5 472 ASH 010 0 ASH 010 0 ASH 009 0 ASH 009 0 ASH 009 0 MA 62 Slide switch INPUT Slide switch MIC LOW CUT Slide switch MIC LOW CUT Slide switch MIC LOW CUT Slide switch MIC LOW CUT ASH 009 0 ASH 009 0 ASH 009 0 ASH 009 0 ASH 009 0 Slide switch MIC LOW CUT Slide switch MIC LOW CUT Slide switch MIC ATTENUATOR Slide switch MIC ATTENUATOR Slide switch MIC ATTENUATOR ASH 009 0 ASH 009 0 ASH 009 0 ASH 009 0 ASH 009 0 Slide switch MIC ATTENUATOR Slide switch MIC ATTENUATOR Slide switch MIC ATTENUATOR ASH 009 0 ASH 009 0 ASH 009 0 35 12 PACKING METHOD AND PART NUMBERS CARDBOARD SIDE PAD L a AHA 044 0 VINYL COVER AHG 016 0 S
23. m Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film 30 Part No RDAPS 683 4 5 683J RD4PS 222 RD PS 222J 102J 102 RDYPS 913 RD PS 913 184 RDZPS 184 5 102 5 102 RD4PS 124 5 124 224 RD4PS 224 RD PS 304 304 272 RD PS 272 183 RD PS 183 683 RDAPS 683 RD4PS 222 RD PS 2225 334J 334 334 334 334 334 334 RDAPS 334 RDAPS 334 RDPS 334 RD PS 334 RD amp PS 334 RD PS 222 RD 4PS 222 RD 4PS 2255 RD PS 225J RDAPS 125 RDAPS 125J RDAPS 364J RD 4PS 364J RDAPS 152J RDAPS 152 RD4PS 623 RDAPS 623 MICROPHONE AMPLIFIER ASSEMBLY MA 62 Symbol Description Part No SEMICONDUCTORS Description Part No R101 Carbon film 100k RD PS 104J R102 R103 R104 R105 R106 R107 R108 R109 R110 R111 R112 R113 R114 R115 R116 R117 R118 R119 R120 R121 R122 R123 R124 R125 R126 R127 R128 R129 R130 R131 R132 R133 R134 R135 R136 R137 R138 R139 R140 R141 R142 R143 R144 R145 Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon
24. nals and the phono terminals of channels 1 and 2 only are amplified by the two NPN transistors in the direct coupled NFB type amplifier after selection with the input switches 2 Both the standard jacks and the DIN type connectors can be used for the microphone inputs but as the standard jacks defeat the DIN connector it is not possible to use the standard jacks when a microphone is con nected to the DIN type connector for the same channel If two microphones are plugged into the same channel at the same time only the one plugged into the standard jack can be used 3 The amplified signals from the microphone or turntable are next fed to the resistors in the mixing stage through the slider type level controls of each channel except 3 and 4 which have pan pots and the output chan nel selector switch 4 The signals mixed by the resistors in the mixing stage are then amplified in the direct coupled amplifier by the PNP and the NPN transistors 2 transistors in all 5 The signal taken from the NPN transistor emitter emitter follower passes through the MASTER VOLUME potentiometer to be amplified in another two transistor direct coupled amplifier and then sent to the output terminals from the emitter follower VMA 62 6 The output terminals have both phono jacks and a DIN type connector The two pairs of phono jacks and DIN type connector are wired in parallel so they can be used simul taneously if necessary 7 Th
25. r Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor IC IC Diode Diode Zener diode 2SC1344 E or D 2SC1312 G or F 2SC1344 E or D 2SC1312 G or F 2SC1344 E or D 2SC1312 G or F 2SC1344 E or D 2SC1312 G or F 2SC1344 E or D 2SC1312 G or F 2SC1344 E or D 28C1312 G or F 2SC1344 E or D 28C1312 G or F 2SC1344 G or 2SC1312 G or F 2SC1344 E or D 2SC1312 G or F 2SC1344 E or D 28C1312 G or F 28C1344 E or D 2SC1312 G or F 2SC1344 E or D 28C1312 G or F 2SA725 G or F 2SA763P 5 or 6 28C1344 E or D 2SC1312 G or F 2SC1344 Eor D 2SC1312 G or F 2SC1344 E or D 28C1312 G or F 2SA725 G or F 2SA763P 5 or 6 2SC1344 E or D 2SC1312 G or F 2SC1344 E or D 2SC1312 G or F 2SC1344 E or D 2SC1312 G or F 2SD313 D or E 25 945 R TA7066P TA7066P SIBO1 02 1S1886 51801 02 151886 WZ 130 MICROPHONE AMPLIFIER ASSEMBLY 32 11 4 SWITCH CIRCUIT A ASSEMBLY AWS 060 0 O gt ud 171525 18 22 24 19 21 30 35 3237363840 33 42 45 50 4151525355 54 57 O O O TYY Q Cymu mm ymn y UI R Ri 470 4 7K 10 12 29 41 43 A w Foil Side AWS 060 0 Parts List of Switch Circuit A Assembly AWS 060 0 CAPACITORS Descript
26. stances of 330kQ 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 Q4 to the base of in the mixing amplifier This not only helps to reduce distortion and noise the effect of NFB but also keeps the input impedance of very low maintaining stable operation LEVEL CONTROL OUTPUT SELECTOR To Mixing Circuit R Channel 10 MIXING CIRCUIT L CHANNEL RM RM ISOLATION RESISTORS 330k 2 RNF NFB RESISTOR 560k 2 Fig 2 MA 62 7 LEVEL DIAGRAM EQUALIZER MIXING MIC AMP RESISTORS FLAT AMP FLAT AMP MIC AA OUTPUT PHONO o o i e HEADPHONE AMP gt LINE a HEADPHONES _ i l MIC t l l l I i i i I j 1 1 0 i i T _ r l 1 u QUTPUT 330mV 1 j j d 1 CH I Sa I st eo 20 t rh 1 SE 1 LINE 50mV pe J E HEADPHONES EN L _ 40nV
27. ut Sensitivity Impedance MIC PHONO LINE MIC Attenuator MIC Overload Level PHONO Overload Level Output Rated Output Level Harmonic Distortion Maximum Output Channel Separation L R Panoramic Potentiometer 0 25mV 4 7kQ 2 5mV 50kX 50mV 50kX2 0dB 20dB 250mV rms at attenuator 20dB 250mV rms at 1kHz Stereo x 2 parallel 330mV Less than 0 296 at 1V output 5V T H D z 0 596 50k9 load More than 70dB at 1kHz Cross talk More than 70dB at 1kHz Freguency Response MIC 20Hz to 15kHz dB PHONO RIAA Equalization 0 5dB LINE 20Hz to 25kHz UN dB MIC Low Cut fc 200Hz 6dB oct Less than 1dB Less than 0 05mV Channel Interference Residual Hum amp Noise S N IHF Short Circuited A Network MIC 52dB PHONO 60dB LINE 67dB Headphone Output Maximum 260mV 89 MISCELLANEOUS Power Requirements AC 120V 60Hz Power Consumption 5W Dimensions 400 W x 132 H x 264 D mm 15 3 4 x 5 3 16 x 10 3 8 in Weight Without Package 5 8kg 13 Ib With Package 7 3kg 16 Ib FURNISHED PARTS Connection Cord with Pin Plus 1 Operating Instructions 1 NOTE Specifications and the design subject to possible modification without notice due to improvements MA 62 2 CONNECTION DIAGRAM SPEAKER SYSTEMS STEREO TAPE DECK STEREO TAPE DECK LEFT CHANNEL RIGHT CHANNEL for recording for playback h 4 h 4 e TN I f
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