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SERVICE MANUAL

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1. ELECTROLYTIC CAPACITORS nin me 2 I RATING Use the high voltage rated one mp 6 3 VOLT 10 VOLT 16 VOLT 25 VOLT 35 VOLT 50 VOLT ii PART No PART No PART No PART No PART No PART No 047 gt 1 121 726 00 1 0 1 121 391 00 22 gt 121 450 060 33 gt 1 121 392 00 gt 1 121 393 00 47 1 121 395 00 gt 1 121 396 00 10 1 121 651 00 1 121 398 00 1 121 738 00 22 1 121 479 00 1 121 480 00 1 121 662 00 1 121 152 00 33 gt gt 1 121 403 00 1 121 404 00 1 121 652 00 1 121 405 00 4 1 121 352 00 1 121 409 00 1 121 410 00 1 121 653 00 1 121 411 00 100 1 121 414 00 1 121 415 00 1 121 416 00 1 121 357 00 1 121 417 00 220 1 121 419 00 1 121 420 00 1 121 421 00 1 121 422 00 1 121 261 00 1 121 423 00 330 1 121 751 00 1 121 521 00 1 121 654 00 1 121 655 00 1 121 656 00 470 1 121 424 00 1 121 426 00 1 121 733 00 1 121 361 00 1 121 810 00 1000 1 121 245 00 1 121 657 00 1 121 388 00 1 123 061 00 2200 1 121 658 00 1 121 660 00 1 123 067 00 1 121 984 00 3300 1 121 661 00 1 123 071 00 r 100 VOLT 160 VOLT 250 VOLT 350 VOLT 0 47 10 1 123 249 00 1 123 252 00 1 123 003 00 1 121 168 00 22 1 123 250 00 1 123 026 00 1 123 028 00 33 1 121 995 00 47 1 123 255 00 1 121 246 00 1 1 10 1 121 126 00 1 121 999 00 71 122325404 1 123 008 00 22 1 121
2. M The capacitan Ce values Marked the units 0 to4 are decided by setting TA D900 53 1 3 53 1 4 3 ow BUFFER 3 Wo IN BUFFER 4 Q407 ai un Q410 AMAO OP o 4 gt 4 4 4 i 1 1 CH 3 OUTPUT BUFFER AMP AN e CH 2 BUFFER 4 10 2 BUFFER 3 0307 OUTPUT BUFFER AMP Q158 160 1 BUFFER 510 BASS BOOST MUTING DRIVE Q802 S8 MUTING VOLTAGE REG 0701 705 VOLTAGE REG 0706 710 VOLTAGE REG 0753 755 VOLTAGE REG Q756 760 N 5 MUTING lt 44 0801 Y fs S J TA D9OC ELECTRICAL PARTS ELECTRICAL PARTS Ref No Part No Description IRef No Part No Description C305 1 131 520 00 TANTALUM 22MF 20 160V C709 1 107 277 00 MICA 0 5PF 1007 C306 130 301 00 FILM 0 015MF 5 100V C709 1 131 520 00 TANTALUM 22MF 20 160V C355 1 131 520 00 TANTALUM 22 20 160V C710 1 107 277 00 MICA 5PF 0 5PF 100V C356 1 130 301 00 FILM 0 015MF 5 1007 1 131 520 00 TANTALUM 22MF 20 160V C405 1 131 520 00 TANTALUM 22MF 20 160V 6758 1 123 687 00 ELECT 2200MF 20 16V C406 130 301 00 FILM 0 015MF 5 1
3. 8265 1 214 869 00 METAL 1 6K 1X 1 24 R352 1 214 158 00 METAL 12K 1 1 40 R266 1 214 869 00 METAL 1 6K 1 1 2W 9353 1 214 163 00 METAL 20K 15 1 4W R268 1 214 816 00 METAL 10 1 1 2 R354 1 214 158 00 METAL 12K 15 1 AM R269 1 214 816 00 METAL 10 15 1 2 R355 1 214 160 00 METAL R270 1 214 848 00 METAL 220 1 1 28 R356 1 214 165 00 METAL 28 077 8271 1 214 840 00 METAL 100 14 1 2 8357 1 214 153 00 METAL 7 5K 1X 1 44 R272 1 214 840 00 METAL 100 1 1 2W R358 1 214 155 00 METAL 9 1K 1 1 44 8273 1 214 840 00 100 1 1 2 R359 1 214 160 00 METAL 15K 1 1 AM R274 1 214 844 00 METAL 150 1 1 2 2360 1 214 162 00 METAL 18K 1 Ad 8275 1 214 844 00 METAL 150 1 1 2 R361 1 214 165 00 METAL 24 1 1 4 R276 1 214 869 00 METAL 1 6K 1 1 2M R362 1 214 169 00 METAL 36k 1 1 44 R277 1 214 869 00 METAL 1 6K 1 1 28 R363 1 214 156 00 METAL 10k 1 R279 1 214 816 00 METAL 10 1 R364 1 214 159 00 METAL 1k 1 1 44 NOTE CAPACITORS Items with no part number and no 4 5 All capacitors are in uF Common ca cription are not stocked because they pacitors are omitted Refer to the are seldom required for routine service following 11515 for their part numbers Items marked are not stocked since MF uF PS thev are seldom required for routine RESISTORS service Some delay should be antici All resistors are in ohms Common pated when ordering these items 1 4W 1 84 and 1 16W carbon resistors D
4. thev are seldom required for routine RESISTORS service Some delay should be antici All resistors are in ohms Common pated when ordering these items 1 44 1 80 and 1 16W carbon resistors Due to standardization parts with part are omitted Refer to the following numbers A AAA AAA XX or lists for their part numbers dote may be different from those used in the lemma ble set 9 MMH mH UH uH 0900 ELECTRICAL PARTS f No Part No Description R560 1 214 162 00 METAL 18K R561 1 214 165 00 METAL 24K R562 1 214 169 00 METAL 36K R563 1 214 872 00 METAL 2 2K R566 1 214 872 00 METAL 2 2K R570 1 214 840 00 METAL 100 R701 1 214 132 00 METAL R702 1 214 151 00 METAL 6 2 8703 1 214 096 00 METAL 33 R704 1 214 128 00 METAL 680 R705 1 214 128 00 METAL 680 R706 1 214 878 00 METAL 3 9K R707 1 214 096 00 METAL 33 R708 1 214 132 00 METAL 1K R710 1 214 128 00 METAL 680 R711 1 214 128 00 METAL 680 R712 1 214 878 00 METAL 3 9K R713 1 214 882 00 METAL 7 5K R714 214 151 00 METAL 6 2K R751 1 214 132 00 METAL R752 1 214 151 00 METAL 6 2K R753 214 096 00 METAL 33 8754 1 214 128 00 METAL 680 R755 1 214 128 00 METAL 680 R756 1 214 878 00 METAL 3 9K 8757 1 214 096 00 METAL 33 R758 214 132 00 METAL 1K R760 214 128 00 METAL 680 R761 1 214 128 00 METAL 680 R762 214 878 00 METAL 3 9K 8763 1 214 882 00 METAL 7 5K R764 1 214 151 0
5. 0900 AEP Model UK Model ELECTRONIC CROSSOVER NETWORK SPECIFICATIONS GENERAL Power Requirements 110 V 120 V 220 V or 240 V ac 50 60 Hz System Filter characteristics 24 dB per octave AEP model 220 V factory preset Bessel function high pass and low pass UK model 240 V factory preset Buffer amp DC amp Power Consumption 15 watts Crossover Frequency UNITO 50 Hz 80 Hz 100 Hz UNIT 1 140 Hz 225 Hz 280 Hz Dimensions Approx 480 w x 80 h x 400 d mm UNIT 2 500 Hz 800 Hz 1 kHz 187 x 3Y h x 157 UNIT3 1 25 kHz 2 kHz 2 5 kHz inches UNIT 4 5 kHz 8 kHz 10 kHz Including projecting parts and controls Weight Approx 8 5 kg 18 Ibs 12 oz net Bandpass Gain Approx 9 5 kg 20 Ibs 15 02 in shipping Inputs 1 volt rated 7 volts maximum carton Outputs 1 volt rated 7 volts maximum 100 Q Harmonic Distortion Less than 0 05 96 at 1 volt output Signal to noise ratio Better than 110 dB 1 volt rated input short circuited input A weighting Frequency Response DC 100 kHz 70 SAFETY RELATED COMPONENT WARNING COMPONENTS IDENTIFIED BY SHADING AND MARK ON THE SCHEMATIC DIAGRAMS EXPLODED VIEWS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS 8 PUBLISHED BY SONY amp SERVICE MANUAL 090
6. 52 2 5 500 Hz t 800 Hz i 82 2 1 1 52 2 WHEN p FLAT 2 HIGH Channel 4 I Z 4 140 Hz Jj _filter 2 1 serre 22 225Hz ier 2 2 UNIT 1 pos 280 FLAT 61 12 1 51 1 3 51 1 4 51 1 5 Wo DAN CH 1 4 v CH 1 BUFFER 1 BUFFER 2 0206 208 210 12dB oct Q201 203 205 filter 1 1 LOW Channe 77 RV 601 Fig 3 The capacitance values marked amp are decided by setting the units O to 4 0900 fs seem 5 47 24dB out out Fig 3 4 CH 3 CH 3 OUTPUT Q410 Q114 12dB oct RV 603 1 HIGH MID HIGH T eee H CH 2 OUTPUT BUFFER AMP 4 F BUFFER AMP Q310 12dB oct MID LOW 24dB oct oO 4103 24dB oct 0900 1 2 BLOCK DIAGRAM CH 4 OUTPUT BUFFER AMP 0117 PRE BUFFER AMP Q101 103 105 CH 4 BUFFER AMP2 L SETTING UNIT 4 CH 3 BUFFER AMP 1 0401 S2 2 2 Ier 52 2 1 52 freq 2 IkHz WHEN SETTING UNITS FLAT CH 2 BUFFER 2 CH 2 BUFFER AMP 1 0301 oJ 140 2 51 frea 1 4 22542 UNIT 1 280Hz FLAT 81 1 1 PME SP 51 455 CH 1 BUFFER AMP 1 o b BUF
7. 52 20 5 RTe 5 20 S 604 20 5 1603 20 6 87602 204 5 LOW MID HIGH Uy Se 08 Se eq 2 treg i treq 3 19 2 freq LEFT ATTENUATOR IGM miconductor Lead Layouts 84 93 364 634 40 10278 534A 2SK120 2541138 25 734 25 2676 5 D 258719 258720 250759 250760 151555 10 10 2 12 51 01 02 cathode 2SK244 1 10YG0 8 10YG1 1 10YG1 5 10YD2 4A SIRB10 SIRBA10 cathode Note e Color code of sleeving over the end of the jacket B pattern s signal path signal path H CH signal path BASS BOOST L BOARD 8488 80051 39 m 5 1 5 4 5 FLAT 6 0 6 6 0 1 5 gt 5 4 4 0 0 4 0 0 3 icc 3 o o 2 1 2 3 5 14 4 INTERNAL CONNECTION PLI POWER REO VOLTAGE SELECTOR PTI POWER TRANSFORMER 0 802 853 852 851 806 807 804 803 802 801 20 5 Low Low Low
8. R112 R113 R114 R115 R116 R117 R119 R120 R121 R123 R124 R126 R127 R128 R129 R133 R134 R135 R136 R140 NOTE ELECTRICAL PARTS Part No 8 729 113 82 8 729 113 82 8 729 167 62 8 729 113 82 8 729 113 82 8 729 167 62 8 729 167 62 8 729 372 02 8 729 376 02 8 729 167 62 8 729 113 82 8 729 113 82 8 729 167 62 8 729 113 82 8 729 113 82 8 729 167 62 8 729 167 62 8 729 372 02 8 729 663 47 8 729 103 43 1 214 173 00 1 214 844 00 1 214 844 00 1 214 869 00 1 214 869 00 1 214 840 00 1 214 816 00 1 214 848 00 1 214 816 00 1 214 840 00 1 214 840 00 1 214 913 00 1 214 840 00 1 214 844 00 1 214 869 00 1 214 869 00 1 214 816 00 1 214 816 00 1 214 848 00 1 214 840 00 1 214 840 00 1 214 840 00 1 214 180 00 1 214 913 00 1 214 872 00 1 214 840 00 1 214 180 00 1 214 913 00 1 214 872 00 1 214 840 00 Description TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL 2541138 2541138 25 2676 25A1138 2541138 25 2676 25 2676 258720 250760 25 2676 25 1138 2541138 2
9. 0117 8 727 313 07 TRANSISTOR 2SK42 3 D160 8 719 210 20 DIODE 10YG2 0 Q151 8 765 640 10 TRANSISTOR 25 244 1 0161 8 719 210 20 DIODE 10YG2 0 0153 8 765 020 00 TRANSISTOR 254884 0162 8 719 210 20 DIODE 10YG2 0 0154 8 729 309 36 TRANSISTOR 25410278 D163 8 719 210 20 DIODE 10YG2 0 Q155 8 765 222 20 TRANSISTOR 25 1963 0164 8 719 210 20 DIODE 10YG2 0 0156 8 765 640 10 TRANSISTOR 2SK244 1 D165 8 719 210 20 DIODE 10YG2 0 0158 8 765 020 00 TRANSISTOR 254884 D166 8 719 210 20 DIODE 10YG2 0 0159 8 729 309 36 TRANSISTOR 25410278 D167 8 719 210 20 DIODE 10YG2 0 0160 8 765 222 20 TRANSISTOR 25 1963 0702 8 719 201 11 DIODE 10 61 1 Q161 8 727 313 08 TRANSISTOR 2SK42 3 D703 8 719 999 64 DIODE 1 0612 Q164 8 727 313 07 TRANSISTOR 2SK42 3 D704 8 719 999 64 DIODE EQA01 06T2 Q167 8 727 313 07 TRANSISTOR 2SK42 3 0705 8 719 201 11 DIODE 10YGl 1 Q201 8 765 640 10 TRANSISTOR 2SK244 1 0706 8 719 999 64 DIODE 01 06 2 0203 8 765 020 00 TRANSISTOR 254884 0707 8 719 201 11 DIODE 10YG1 1 9204 8 729 309 36 TRANSISTOR 25410278 D751 8 719 201 11 DIODE 10YG1 1 Q205 8 765 222 20 TRANSISTOR 25 1963 D752 8 719 201 11 DIODE 10YG1 1 Q206 8 765 640 10 TRANSISTOR 2SK244 1 D754 8 719 201 11 DIODE 10YG1 1 Q208 8 765 020 00 TRANSISTOR 254884 D755 8 719 201 11 DIODE 10YG1 1 Q209 8 729 309 36 TRANSISTOR 2SA1027R D756 8 719 999 64 DIODE 01 06 2 Q210 8 765 222 20 TRANSISTOR 25 1963 D757 8 719 201 11 DIODE 10 61 1 Q251 8 765 640 10 TRANSISTOR 2SK244 1 0758 8 719 999 64 D
10. set screw i j PSP go spring washer spring washer for replace 2 un ment 5 SE hexagon socket set screw ex SC 26 x 4 hexagon PSW pan head screw with binding head B screw and socket PSPW 8 spring and flat washers spring and flat washers for NONE NUT replacement L e round head screw binding head B screw for N Be not replacement E WASHERS K flat countersunk he T TAS em p Ext unk head w flat washer RK oval countersunk head Sw 1 spring washer E screw 1 5 B LW internal tooth lock ex LW3 internal e binding head screw e Waher T truss head screw binding head B screw for LW external tooth lock LW3 external ur replacement washer F flattillister head screw RETAINING RINGS e 1 screw T E Q retaining ring 4 BV braizer head screw G 9 grip type retaining ring T L 1 090 CH 4 OUTPUT BUFFER AMP Q117 BUFFER AMP2 B FFER AMP PRE BUFFER 2101 103 10 J101 5323 053 25 5 LANPUT 5504 2 1 9 8KHz 7 S322 thr 324 m Y 1 10 KHz 228 5 53 FLAT WHEN SETTING UNIT 4 4 BUFFER AMP 1 2324 800 Hz 77 22 2 rd g
11. 1 102 816 00 20 1 102 958 00 130 1 101 081 00 0 001 1 000pF CERAMIC SEMICONDUCTOR CAPACITORS RATING Use the high voltage rated one 25 VOLT 50 VOLT 25 VOLT 50 VOLT CAP uF uF PART PART No PART No 0001 1 161 039 00 0 018 1 161 016 00 1 161 054 00 0 0012 E 1 161 040 00 0 022 1 161 017 00 1 161 055 00 00015 1 161 041 00 0 027 1 461 018 00 1 161 056 00 0 0018 1 161 042 00 0 033 1 161 019 00 1 161 057 00 0 0022 1 161 043 0 0 039 1 161 010 00 161 058 00 0 0027 1 161 044 00 0 047 1 161 021 00 1 161 059 00 0 0033 1 161 045 00 0 056 E 1 161 060 00 0 0039 1 161 046 00 0 068 gt 1 161 061 00 0 0047 gt 1 161 047 00 0 082 1 161 024 00 1 161 062 00 0 0056 1 161 048 00 01 1 161 025 00 1 161 063 00 0 0068 m 1 161 049 00 0 0082 1 161 012 00 1 161 050 00 0 01 1 161 013 00 1 161 051 00 0 012 1 161 052 00 9 015 1 161 015 00 1 161 053 00 TA D900 MYLAR CAPACITORS RATING VOLT 100 VOLT 200 VOLT 50 VOLT 100 VOLT 200 VOLT 50 VOLT 100 VOLT 200 VOLT CAP uF CAP uF T T uF 1 PART No PART No PART No PART No PART PART No PART No PART No PART No 0 001 1 108 227 00 1 108 365 00 1 108 409 00 0 01 1 108 239 00 1 108 377 00 1 108 421 00 91 108 251 00 1 108 389 00 1 108 433 00 0 0012 1 108 351 00 1 108 366 00 1 108 410 00 0 012 1 108 357 00
12. 1 246 448 00 680 750 820 910 1 246 469 00 1 246 470 00 1 246 471 00 1 246 472 00 1 246 473 00 1 246 450 00 1 1 246 474 00 1 246 451 00 1 1 246 475 00 1 246 476 00 1 246 477 00 1 246 478 00 1 246 479 00 1 246 480 00 1 246 481 00 1 246 482 00 1 246 483 00 1 246 484 00 1 246 485 00 1 246 486 00 1 246 487 00 1 246 488 00 1 246 489 00 1 246 490 00 1 246 491 00 1 246 492 00 1 246 493 00 1 246 494 00 1 246 495 00 1 246 496 00 1 246 500 00 Part No 1 246 497 00 1 246 498 00 1 246 499 00 1 246 501 00 1 246 502 00 1 246 503 00 1 246 504 00 1 246 505 00 1 246 506 00 1 246 529 00 2 1 246 507 00 1 246 508 00 1 246 509 00 1 246 510 00 1 246 511 00 1 246 532 00 3 1 246 534 00 3 1 246 512 00 1 246 513 00 1 246 514 00 1 246 515 00 1 246 516 00 1 246 539 00 1 246 540 00 1 246 541 00 1 246 542 00 1 246 543 00 1 246 544 00 1 246 517 00 1 246 518 00 1 246 519 00 1 246 520 00 HARDWARE NOMENCLATURE o 1 246 521 00 1 0M 1 246 522 00 1 1M 1 246 523 00 1 2 1 246 524 00 1 3M 1 210 816 00 1 246 525 00 1 5 1 246 526 00 1 6 1 246 527 00 1 8M 1 246 528 00 2 0 1 246 530 00 2 4 1 246 531 00 2 7M 1 246 533 00 3 3M 1 246 536 00 4 3M 1 246 537 00 4 7M 1 246 538 00 5 1M Part No 1 246 545 00 1 210 814 00 1 210 815 00 1 210 817 00 1 210 818 00 1 210
13. ICON 0106 0020 0304 27 d 3 0304 25 42 BUFFER CNJ5 HIGH Ow 843544 lt IDL ur 4 pos c306 008 jaye 39122 15 0108 00 Ok og 8522 1002 0 8339 TRI 18 4 d me 0 8 100 c30522 6V 5 0107 307 310 111 25 42 0020 22k OV 05 06 07 08 09 CNJ3 e 9407 410 114 25 42 05 06 07 08 0900 G H J UNIT 3A 3B BOARD UNIT 4A 4B BOARD 2009 0009 0009 0062 0002 000 00 441 38 IOkHz 48 C635 C636 C637 C638 C645 0646 C647 C648 0 0047 0 0043 0 0060 00024 0 0012 0 001 0 0016 620p bs dud MAIN BOARD HO 25 1963 AMP s CONNECTOR BOARD 9 R21 220 mee 0 RI26 100 m m I 3 27 BASS BOOST L BOARD a PEDE 014 23 0114 R135 0114 t00 10YD2 0 3 56 25 244 58 254884 0159 254893 0160 2501963 0164 RIBS 0164 10 02 0 CAN 9140 RIAT 100 8 109 Ri 6 106 1 100 107 I IQOV BASS BOOST R BOARD 510 _ BASS 80051 3 4104 L es 105 d 2v 0704 254 138 0703 254 188 0709 25 2676 0708 2562 OUT 1 COMPARATOR COMPARATOR D702 707 h 708 C70 22 504 6 0704 705 10961 0710 258719 QLTAGE CONTRO D 075 250759 0752 757 07611 9 0753 0754 755 10761 0754 2541138 0759 25 2
14. d R557 2 5 0165 3 18 219 10 020 a CNJ12 99 8 97 O6 55 04 03 02 l CNJ 0900 4 2 SCHEMATIC DIAGRAM EACH BOARD SHOWN BELOW 15 CONNECTED WITH 1 UNIT 0A 0B BOARD C601 C602 C604 02 02 0 2 02 50 04 08 C605 C606 C607 608 0 12 0 1 0 16 062 0101 25 244 0104 25 893 L cQ 003 254884 0105 25 1963 0301 25 42 0401 25 CH2 BUFFER AMP I CH3 BUFFI CONNECTOR PRE BUFFER AMP BOARD 0520 53 INPUT Tinto T HI 9312 36 11 1 91020 E 09 08 67 56 5 05 04 03 02 OI CNJ2 CNJA o T 900 OF 1 12 UNIT 1A 1B BOARD 61 C612 C613 C6l4 0 082 0 082 0 082 0 082 E F UNIT 2A 2B BOARD 0022 002 002 002 40 500Hz 24 2256 800Hz 280H7 128 C 6 C 6 C627 0628 0043 059 2 gt M 0016 00662 020 25 244 0204 254893 0206 25 244 0209 254893 0106 2SK244 42 0203 254884 0205 25 1963 0208 254884 0210 9108 254884 CH BUFFER AMP CHI BUFFER 2 OUTPUT BUFF 22 020 _ yt S dE 270 O5 06 O7 08 99 Mc mum 0106 el R221 100 4 11 27 5 909 5 8207 15 8 20 0 an 43 e 1 S 1 24 H 4 0104 gt 51 2 5 4 R33 2106
15. 0 METAL 6 2 8801 214 140 00 METAL 2 2 R802 1 214 172 00 METAL 47K R803 214 156 00 METAL 10K R804 214 172 00 METAL 47K R805 1 214 132 00 METAL 1 R806 1 214 140 00 METAL 2 2K R807 1 244 809 00 CARBON 252 R808 1 244 855 00 CARBON 180 R901 214 888 00 METAL 10K R902 1 214 885 00 METAL R903 1 214 882 00 METAL 7 5K R904 214 880 00 METAL 4 7K R905 1 214 840 00 METAL 100 R906 1 214 937 00 METAL iM R907 1 214 880 00 METAL 4 7K R908 1 214 882 00 METAL 723515 R909 1 214 883 00 METAL 6 2K R910 1 214 890 00 METAL 12K NO Items with no part number and no des cription are not stocked because they are seldom required for routine service Items marked are not stocked since thev are seldom required for routine service Some delay should be antici pated when ordering these items Due to standardization parts with part numbers A AAA AAA XX A AAAA AAA X may be different from those used in the set 1 1 1 1 1 1 1 1 ELECTRICAL PARTS Ref No Part No 1 44 87101 1 224 247 1 4 RT102 1 224 247 1 49 67151 1 224 247 1 24 152 1 224 247 1 2 RT201 1 224 247 1 2W RT202 1 224 247 1 4 1251 1 224 247 1 4W RT252 1 224 247 1 4M 1 44 1 515 323 00 RY2 1 515 323 00 1 4W 1 515 323 00 1 2W RY4 1 515 323 00 1 4W RY5 1 515 323 00 1 44 1 44 RY6 1 515 323 00 RY7 1 515 323 00 1 44 RY8 1 515 3
16. 00 1 214 816 00 1 214 848 00 1 214 816 00 1 214 840 00 1 214 840 00 1 214 913 00 1 214 840 00 1 214 844 00 1 214 869 00 1 214 869 00 1 214 816 00 1 214 816 00 1 214 848 00 1 214 840 00 1 214 840 00 1 214 840 00 1 214 180 00 1 214 913 00 1 214 872 00 1 214 840 00 1 214 180 00 1 214 913 00 1 214 872 00 1 214 840 00 1 214 180 00 1 214 913 00 1 214 872 00 1 214 840 00 1 214 180 00 1 214 156 00 1 214 159 00 1 214 163 00 1 214 156 00 1 214 159 00 1 214 163 00 1 214 156 00 1 214 159 00 1 214 163 00 1 214 156 00 Common ca Refer to the following lists for their part numbers MF yF PF uyF RESISTORS All resistors are in ohms Common 1 44 1 80 and 1 16W carbon resistors are omitted Refer to the following lists for their part numbers F nonflammable Description METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL METAL COILS MMH 090 100K 100K 2 2K 100 100K 51K 150 150 1 6K 1 6 100 10 220 10 100 100 100K 100 150 1 6K 1 6K 10 10 220 100 100 100 100K 100K 2 2K 100 100K 100K 2 2K 100 100K 100K 2 2K 100 100K 10
17. 00 C753 1 131 520 00 TANTALUM 22MF 20 160 C455 131 520 00 TANTALUM 22MF 20 1607 C754 1 123 687 00 ELECT 2200MF 20 16V C456 1 130 301 00 FILM 0 015MF 5 1007 C756 1 131 450 00 TANTALUM 20 35V C503 1 131 520 00 TANTALUM 22MF 20 60V C758 1 131 450 00 TANTALUM 207 35V C504 130 301 00 FILM 0 015MF 5 1007 C759 1 107 277 00 MICA 5PF 0 5PF 100V C553 1 131 520 00 TANTALUM 22MF 20 160V C759 1 131 520 00 TANTALUM 22MF 20 160V C554 1 130 301 00 FILM 0 015MF 57 1007 C760 1 107 277 00 MICA SPF 0 5PF 100V C611 1 130 175 00 FILM 0 082MF 2 1007 C801 1 123 842 00 ELECT 3300MF 20 25 C612 1 130 175 00 FILM 0 082MF 2 00V C802 1 123 842 00 ELECT 3300MF 20 25V C613 1 130 175 00 FILM 0 082MF 2 100 C803 1 123 842 00 ELECT 3300MF 20 25V C614 1 130 175 00 FILM 0 082MF 2 1007 C804 1 123 842 00 ELECT 3300MF 20 25 C615 1 130 174 00 FILM 0 043MF 2 100V 805 1 123 494 ELECT 100MF 20 25V C616 1 130 173 00 FILM 0 039MF 2 100 C806 1 130 232 00 FILM 0 022 204 300V C617 130 126 00 FILM 0 056MF 23 100V C901 1 131 450 00 TANTALUM IMF 20 35V C618 1 130 172 00 FILM 0 022MF 2 100V C902 1 131 450 00 TANTALUM 20 35V C621 130 172 00 FILM 0 022MF 2 100v C903 1 131 450 00 TANTALUM 20 35V C622 130 172 00 FILM 0 022MF 2 00V C904 1 131 450 00 TANTALUM IMF 20 35V C623 1 130 172 00 0 022MF 2 100v C624 1 130 172 00 0 022MF 2 00V CNJ1 C625 1 130 171 00 FILM 0 012 2 100 6 1 561 141 00 CONN
18. 0805 SIRBAIO mem 138 0701 250759 676 7 VOLTAGE CONTROL 0801 804 AE 300F2 RECT Q707 0706 2541138 DRIVE 0851 854 300 2 SUPPLY BOARD 3 5 0760 258719 26 0900 Frequency marked 1 means that it is measured when UNIT 1 is used Frequency marked 2 means that it is measured when UNIT 2 is used Frequency marked 3 means that it is measured when UNIT is used Note e Components for right channel have same values as for left channel capacitors are in uF unless otherwise noted pF uuF 50WV or less are not indicated except for electrolytics and tantalums resistors are in ohms W unless otherwise noted 1000 2 1000 E En nonflammable resistor panel designation bus B bus e Readings are taken under no signal conditions with a VOM 20 Note The coran didt identified i by PU NM and critical for safety Replace only with part nun off Nw 153 105 103 60 158 110 108 151 156 101 106 167 164 161 159 i 109 104 s 154 104 ISI iol 759 754 709 704 758 753 708 703 756 753 706 703 152 2 10 760 751 710 701 755 757 705 707 756 755 706 705 757 752 251 254 754 752 704 702 707 702 201 204 551 457 451 357 351 501 407 401 307 301 253 255 203 205 165 162 160 157 155 15 2 110 107 105 153 166 163 1
19. 1 108 378 00 1 108 422 00 0 12 1 108 363 00 1 108 390 00 1 108 434 00 0 0015 1 108 228 00 1 108 367 00 1 108 411 00 0 015 1 108 240 00 1 108 379 00 1 108 423 00 0 15 1 108 252 00 1 108 391 00 1 108 435 00 9 0018 1 108 352 0060 1 108 368 00 108 412 00 0018 1 108 358 00 1 108 380 00 1 108 424 00 018 1 108 364 00 1 108 392 00 1 108 436 00 0 0022 1 108 230 00 1 108 369 00 1 108 413 00 0 022 1 108 242 00 1 108 381 00 1 108 425 00 022 1 108 254 00 1 108 393 00 1 108 437 00 0 0027 1 108 353 00 1 108 370 00 1 108 414 00 0 027 1 108 359 00 1 108 382 00 1 108 426 00 0 27 1 108 854 00 0 0033 1 108 232 00 1 108 371 00 1 108 415 00 0 033 1 108 244 00 1 108 383 00 1 108 427 00 033 1 108 855 00 0 0039 1 108 354 00 1 108 372 00 1 108 416 00 0039 1 108 360 00 1 108 384 00 1 108 428 00 0 39 1 108 856 00 0 0047 1 108 234 00 1 108 373 00 108 417 00 0 047 1 108 246 00 1 108 385 00 1 108 429 00 047 1 108 857 00 0 0056 1 108 355 00 1 108 374 00 1 108 418 00 0 056 1 108 361 00 1 108 386 00 1 108 430 00 0 0068 1 108 237 00 1 108 375 00 1 108 419 00 0 068 1 108 249 00 1 108 387 00 1 108 431 00 0 0082 1 108 356 00 1 108 376 00 1 108 420 00 0 082 1 108 362 00 108 388 00 1 108 432 00 TANTALUM CAPACITORS RATING Use the high voltage rated one 3 15 VOLT 6 3 VOLT 10 VOLT 16 VOLT 20 VOLT 25 VOLT 35 VOLT OMS SHIT PART No PART No PART No PART No PART No PART No PART No 0 01 1
20. 131 396 00 0 015 1 131 397 00 0 02 1 131 398 00 0 03 1 131 399 00 0 047 1 131 400 00 0 068 1 131 401 00 0 1 1 131 402 00 0 15 2 gt 131 403 00 02 1 131 404 00 0 33 1 131 409 00 1 131 405 00 0 47 1 131 412 00 gt 1 131 406 00 0 68 1 415 00 1 131 410 00 1 131 407 00 10 1 418 00 1 131 413 00 1 131 408 00 1 5 421 00 1 416 00 1 131 411 00 1 131 348 00 22 1 131 424 00 1 419 00 131 414 00 1 131 355 00 1 131 349 00 3 3 1 131 422 00 1 131 41 1 131 362 00 1 131 356 00 1 131 350 00 4 7 1 131 425 00 1 131 420 0 1 134 13 1 131 357 00 1 131 351 00 6 8 1 131 423 00 1 376 00 131 370 00 1 131 358 00 1 131 352 00 10 1 131 426 00 1 131 383 00 1 131 377 0 1 131 1 00 1 131 359 00 1 131 353 00 11 15 11 131 390 00 1 131 384 00 1 378 0 1 131 37 131 366 00 1 131 360 00 22 1 131 391 00 1 131 385 00 I 1 0 1 1 36 10 1 131 392 00 1 131 386 00 1 131 380 00 47 1 131 393 00 1 131 387 00 1 131 381 00 68 1 131 394 00 1 131 388 00 100 1 131 395 00 TANTALUM CAPACITORS i RATING 5 3 VOLT 6 3 VOLT 10 VOLT 16 VOLT 20 VOLT 35 VOLT SAP MP PART No PART PART No PART No PART No PART No 0 033 1 131 273 00 0 04 1 131 274 00 0 068 1 131 275 00 0 1 1 131 276 00 0 15 1 131 277 00 0 22 0 33 1 131 263 00 1 131 279 00 0 47 1 131 169 00 1 131 264 00 1 131 280 00 0 68 1 131 258 00 1 131 265 00 1 131 281 00 1 0 1 131 254 00 1 131 266 00 1 131 282 00 15 1 131 250 00 1 131 267 00 1 131 28
21. 23 00 1 2W 1 24 51 1 552 381 00 1744 52 1 552 381 00 1 4 53 1 552 381 00 54 1 552 381 00 1 4W S5 1 552 381 00 1 4W 1 44 S6 1 552 381 00 1 4 1 2W con 1 4M 1 44 1 44 1 44 1 2 1 2 1 44 1 4 1 4 1 4 1 4 1 4M 1 44 1 2W 172 1 24 1 2 1 2 1 2 1 24 1 24 1 2 1 24 1 24 1 2 CAPACITORS All capacitors are in uF Common ca pacitors are omitted Refer to the Description RES RES RES RES RES RES RES RES RELAY RELAY RELAY RELAY RELAY RELAY RELAY RELAY SWITCH SWITCH SWITCH SWITCH SWITCH SWITCH WITCH SWITCH following lists for their part numbers MFiuF PF uyF RESISTORS All resistors are in ohms Common 1 4W 1 8W and 1 16W carbon resistors are omitted Refer to the following lists for their part numbers F nonflammable ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ METAL METAL METAL METAL METAL GLAZE GLAZE GLAZE GLAZE GLAZE METAL GLAZE METAL GLAZE METAL GLAZE ROTARY SLIDE ROTARY SLIDE ROTARY SLIDE ROTARY SLIDE ROTARY SLIDE ROTARY SLIDE AC VOLT SELECT 100 100 100 100 100 100 100 100 The components identified COILS MMH mH UH by shading and mark critical for safety Replace only with part number specified uH Aare 0900 PRE BUFFER AMP 0101 103 105 J101 10 KHz H 5221 53 Fea UNIT 4
22. 3 00 2 1 131 259 00 1 131 268 00 1 131 284 00 3 1 131 255 00 1 131 269 00 47 1 131 251 00 1 131 171 00 1 131 270 00 68 1 131 260 00 1 131 271 00 10 1 131 272 00 15 1 131 252 00 1 131 261 00 1 131 257 00 1 131 176 00 1 131 253 00 1 131 173 00 4 1 131 288 00 1 131 174 00 1 131 177 00 0900 1 4 WATT CARBON RESISTORS No Q 1 246 401 00 1 246 402 00 1 246 403 00 1 246 404 00 1 246 405 00 1 246 406 00 1 246 407 00 1 246 408 00 1 246 409 00 1 246 410 00 1 246 411 00 1 246 412 00 1 246 413 00 1 246 414 00 1 246 415 00 1 246 416 00 1 246 417 00 1 246 418 00 1 246 419 00 1 246 420 00 1 246 421 00 1 246 422 00 1 246 423 00 1 246 424 00 1 246 425 00 100 1 246 449 00 1 246 426 00 110 1 246 427 00 120 1 246 428 00 130 1 246 429 00 150 1 246 452 00 1 246 453 00 1 246 430 00 1 246 431 00 1 246 432 00 1 246 433 00 1 246 434 00 160 180 200 220 240 1 246 454 00 1 246 455 00 1 246 456 00 1 246 457 00 1 246 458 00 1 246 435 00 1 246 436 00 1 246 437 00 1 246 438 00 1 246 439 00 270 300 330 360 390 1 246 459 00 1 246 460 00 1 246 461 00 1 246 462 00 1 246 463 00 430 470 510 560 620 1 246 464 00 1 246 465 00 1 246 466 00 1 246 467 00 1 246 468 00 1 246 440 00 1 246 441 00 1 246 442 00 1 246 443 00 1 246 444 00 1 246 445 00 1 246 446 00 1 246 447 00
23. 4 156 00 METAL 10K 1 1 4W R389 1 214 840 00 METAL 100 1 2W 8470 1 214 159 00 METAL 1954 71 1 44 401 1 214 156 00 METAL 10K 1 1 44 R471 1 214 163 00 METAL 20K 1 1 4W R402 1 214 158 00 METAL 12 1 1 4W R472 1 214 156 00 METAL 10K 1 1 44 R403 214 163 00 METAL 20K 1 1 4 R473 1 214 159 00 METAL 13K 1 1 44 8404 1 214 158 00 METAL 12K 4MW R474 1 214 163 00 METAL 20K 1 1 4W R405 1 214 160 00 METAL 15K 1 1 44 6475 1 214 872 00 METAL 2 2K 1 1 24 8406 1 214 165 00 METAL 24K 1 4 8478 1 214 872 00 METAL 22K 19 1 24 R407 1 214 153 00 METAL 7 55 1 1 44 R481 1 214 913 00 METAL 100K 1 1 24 408 1 214 155 00 METAL 9 IK 1 44 R482 1 214 872 00 METAL 2 2K 1 1 2M 8409 1 214 160 00 METAL 15K 1 1 44 R485 1 214 872 00 METAL 1 24 R410 1 214 162 00 METAL 18K 1 1 44 8489 1 214 840 00 100 1 1 24 R411 1 214 165 00 METAL 24K 1 1 44 R501 1 214 156 00 METAL 10 1 1 44 R412 1 214 169 00 METAL 36K 1 1 44 R502 1 214 158 00 12K 1 1 44 8413 1 214 156 00 METAL 10K 1 1 44 R503 1 214 163 00 METAL 20K 1 1 4W R414 1 214 159 00 METAL 217 1 44 R504 1 214 158 00 METAL 1 1 1 44 415 1 214 163 00 METAL 20K 1 1 4W 8505 1 214 160 00 METAL 15K 1 1 44 R416 1 214 156 00 METAL 10K 1 1 4 R506 1 214 165 00 METAL 24K 1 1 44 R417 1 214 159 00 METAL 13K 1 1 4W R507 1 214 153 00 METAL 1 1 4W R418 1 214 163 00 METAL 20K 1 1 4W R508 1 214 155 00 METAL IKE 1 1 4W R419 1 214 156 00 METAL 10K 1 1 4W R509 1 21
24. 4 160 00 METAL 15K 1 1 4W 8420 1 214 159 00 METAL Ik 17 1 44 6510 1 214 162 00 METAL 18K 1 1 40 R421 1 214 163 00 METAL 20K 1 1 44 8511 1 214 165 00 METAL 24K 1 1 4W 8422 1 214 156 00 METAL 10K 1 1 44 R512 1 214 169 00 METAL 36K 1 1 4M R423 1 214 159 00 METAL 13K 1 1 44 R513 1 214 872 00 METAL 1 1 2W R424 1 214 163 00 METAL 20K 15 1 44 8516 1 214 872 00 METAL 2 2K 1 1 2M R425 1 214 872 00 METAL 2 2 1 1 2W 8520 1 214 840 00 METAL 100 1 1 24 8428 1 214 872 00 METAL ack 1 2W 6551 1 214 156 00 METAL 10K 1 1 4W R431 1 214 913 00 METAL 100 1 1 2M R552 1 214 158 00 METAL 12 1 1 4W 2 6432 1 214 872 00 METAL 2 2 1 1 2W R553 1 214 163 00 METAL 20K 1 1 4W R435 1 214 872 00 METAL 22 1 1 2W R554 1 214 158 00 METAL 12K 1 1 4M 5 R439 1 214 840 00 METAL 100 1 1 2M R555 1 214 160 00 METAL 15K 1 1 4M R45 1 214 156 00 METAL 10K 1 1 4 8556 1 214 165 00 METAL 24K 1 1 44 D R452 1 214 158 00 METAL 12K 14 1 4W R557 1 214 153 00 21 1 44 8453 1 214 163 00 METAL 20K 1 1 44 8558 1 214 155 00 METAL 9 1K 1 1 44 R454 1 214 158 00 METAL 12 17 1 4W R559 1 214 160 00 METAL 1 1 40 CAPACITORS 5 Items with no part number and des All capacitors are in uF Common ca cription are not stocked because they pacitors are omitted Refer to the are seldom required for routine service following lists for their part numbers Items marked are not stocked since
25. 5 2676 25 1138 2541138 2542676 25 2676 258720 2561364 258734 51K 150 150 1 6K 1 6K 100 10 220 10 100 100 100K 100 150 1 6K 1 6K 10 10 220 100 100 100 100K 100K 2 2K 100 100K 100K 2 2K 100 Items with no part number and no des cription are not stocked because they are seldom required for routine service Items marked amp are not stocked since thev are seldom required for routine service pated when ordering these items Some delay should be antici Due to standardization parts with part numbers A AAA AAA XX or A A555 AAA X may be different from those used in the set R141 R142 R143 R147 R148 R151 R152 R153 R154 R155 R157 R158 R159 R160 R161 R162 R163 R164 R165 R166 1 1 4 8167 1 1 24 169 1 1 2u 8170 12 1 2W 8171 15 1 24 ns 1 1 2M R174 1 1 23 2176 1 1 2 R177 1 1 24 8178 14 1 24 R179 1 1 2M R183 12 1 24 184 1 1 24 R185 1 1 2M R186 1 1 2M R190 1 1 24 R191 1 1 20 R192 1 1 24 8193 1 1 24 R197 1 1 2W R198 14 1 2W R201 14 1 W R202 1 aM R203 19 1 24 R204 1 1 24 R205 1 1 24 R206 1 1 44 8207 1 1 2M R208 1 1 2 R209 15 l 2M 8210 CAPACITORS AM capacitors are in uF pacitors are omitted ELECTRICAL PARTS Part NO 1 214 180 00 1 214 913 00 1 214 872 00 1 214 840 00 1 214 180 00 1 214 173 00 1 214 844 00 1 214 844 00 1 214 869 00 1 214 869 00 1 214 840
26. 61 158 156 258 260 208 210 116 113 1 108 106 255 206 554 460 454 360 354 259 504 410 404 310 304 209 103 4 FD RED a Frequency marked 1 means that it is measured when UNIT 1 is used 1 Frequency marked 2 means that it is measured when UNIT 2 is used 81684 208 5 81683 20 5 Frequency marked 3 means that it is measured when UNIT is used n 3 0900 SECTION 4 DIAGRAMS A B C D 41 MOUNTING DIAGRAM UNIT 0A BOARD UNIT 0B BOARD UNIT 2A BOARD UNIT 1B BOARD UNIT 3A BOARD CONNECTOR BOs MAIN BOARD 01 02 10918 108 208 08 08 508 168 268 68 958 108 208 UNIT 28 BOARD UNIT 4A BOARD F UNIT 3B BOARD 25 25 2 C AMC a m HIGH M Low r x Low j c SE Low ee E E Low C treq 4 tQ 8 gt 2077 E2bHI 28 Gee CCWK I82A 93 32 m J103 M 4 na 2 Ds L CH INPUT DU Aa Ni Rc 5 Sues I 2 ET A RED AD s 5 La INN STA SOSA MUR i ak i ae 1 NS TIMER
27. 676 0753 25 113 0758 25 267 4408 CH3 BUFFER fiv S 0 8 C406 0 015 100V zz 5 R439 5 05 8 0 02 0 05 3 013 22 16V RTEO3 0H 20k S 0307 407 0501 504 117 25 42 CH2 CH3 BUFFER AMP 3 D 117 07020 0310 410 0 015 100V CH2 CH3 BUFFER AMP 4 20 0117 0111 14 CH4 OUTPUT BUFFER AMP CH2 CH3 OUTPUT BUFFER 4 8520 503 OV 51 53 100 j 22 16 050 Q gt 7 CH4 BUFFER LA 225Hz 40 1 X3 FLAT 8 2 5 Q504 CH4 BUFFER 2 V 2 FLAT 800H1 9500H1 829 0251 25 244 0253 254884 R28 0256 25 244 0258 254884 R265 R266 R269 0254 254893 0259 254893 0255 25 1963 0260 25 1963 R286 164 9 Gass ae biis 55 1 1 55 1 2 0156 0156 10 02 0 R389 355 0351 354 25 42 0357 360 16 25 42 Q451 454 25 42 0457 460 164 25 42 C456 1489 C455 DIG 653 HIGH 56 1 5 MID HIGH 0161 10 02 0 0167 0551 554 167 2SK42 0167 07020 FLAT 280H1 225 1 9 140 1 X3 FLAT IOkHz BkHz 5kHz 5 X2 FLAT IkHr 800 1 500 1 PL1 14 0806 10 2 CB03 REO4 47k 2200 2213 12W 2 59 A RB 2 21 Q802 2561364 0 25 UTING DET AN 80 258734 ELAY DRIVE 0807 151555
28. 819 00 1 210 820 00 2 1 210 821 00 1 244 754 00 1 244 755 00 1 244 756 00 1 244 757 00 6 1 244 758 00 1 246 535 00 3 9 1 244 759 00 1 244 760 00 1 244 761 00 1 244 762 00 Screw 3 10 Dr Nut Washer Retaining ring rid Length in L L N3 D Diameter in bx ir Pus noe of usable screw or shaft Type of head Ds Reference designation Indicated slotted head only Unless otherwise indicated it means T Reference E cross recessed head Phillips Designation shape Description Ramena SELF TAPPING SCREWS E TA self tapping screw ex TA P3x10 4 ase pan head self tapping binding head self E5 screw tapping TA B screw for eference inti replacement Designation Shape Description Remarks j 1 1 pan head self tapping bindina head self SCREWS screw with washer face tapping TA B screw and IDEE 9 pan head screw binding head screw for washer fonreplecement s A replacement PTTWH 4 pan head thread rolling binding head B screw and PWH e pan head screw with binding head B screw and face 4 masherfor replacement washer face flat washer for replacement SET SCREWS amp 5 pan head screw with binding head B screw and 5
29. 996 00 1 123 253 00 1 123 005 00 1 123 022 00 3 1 121 997 00 1 121 757 00 47 1 123 251 00 1 121 919 00 100 1 123 084 00 E 4 CERAMIC CAPACITORS RATING 50 VOLT 50 VOLT 50 VOLT 50 VOLT a pF bxc CAP CAP pF CAP PART No PART No PART No PART No 0 5 01 837 00 22 102 959 00 150 1 101 361 00 0 001 1 102 074 00 0 75 101 586 00 24 1 102 960 00 160 1 101 367 00 00012 1 102 118 00 10 102 934 00 27 1 102 961 00 180 1 102 976 00 0 0015 1 102 119 00 15 1 101 576 00 30 1 102 962 00 200 102 977 00 0 0018 102 120 00 2 0 102 935 00 33 1 102 963 00 220 1 102 978 00 0 0022 1 102 121 00 3 1 102 936 00 36 102 964 00 240 1 102 979 00 0 0027 1 102 122 00 4 1 102 937 00 39 1 102 965 00 270 1 102 980 00 0 0033 1 102 123 00 5 1 102 942 00 43 102 966 00 300 1 102 981 00 0 0039 1 102 124 00 6 1 102 943 00 47 101 880 00 330 102 820 00 0 0047 1 102 125 00 7 1 102 944 00 81 101 882 00 360 1 102 821 00 0 0056 1 102 126 00 8 1 102 945 00 56 1 101 884 00 390 1 102 822 00 0 0068 1 102 127 00 9 1 102 946 00 62 1 101 886 00 430 1 102 823 00 0 0082 1 102 128 00 10 1 102 947 00 68 1 101 888 00 470 1 102 824 00 001 1 102 129 00 n 1 102 948 00 75 1 101 890 00 510 1 101 059 00 0 022 1 101 005 00 12 1 102 949 00 82 1 102 971 00 560 1 102 115 00 0047 1 101 006 00 13 1 102 950 00 9 102 972 00 680 1 102 116 00 15 1 102 951 00 100 1 102 973 00 820 1 102 117 00 16 1 102 952 00 110 1 102 815 00 18 1 102 953 00 120
30. ECTOR PC BOARD CNJ12 C626 1 130 170 00 FILM 0 011MF 2 1007 C627 1 130 125 00 FILM 0 016MF 2 00V D101 8 719 210 20 DIODE 10762 0 C628 1 130 168 00 FILM 0 0062MF 2 100 0102 8 719 210 20 DIODE 10 02 0 631 1 130 169 00 FILM 0 0091MF 2 00V 0103 8 719 210 20 DIODE 10YG2 0 C632 1 130 169 00 FILM 0 0091 2 100V 0104 8 719 210 20 DIODE 10YG2 0 0105 8 719 210 20 DIODE 10YG2 0 C633 1 130 169 00 FILM 0 0091MF 2 100V C634 1 130 169 00 FILM 0 0091 2 100V D106 8 719 210 20 DIODE 10YG2 0 C635 1 130 167 00 FILM 0 004 7MF 2 100 D107 8 719 210 20 DIODE 10762 0 636 1 130 123 00 FILM 0 004 3MF 2 100 0108 8 719 210 20 DIODE 10YG2 0 C637 1 130 168 00 FILM 0 0062MF 2 1007 D109 8 719 210 20 DIODE 10YG2 0 0110 8 719 210 20 DIODE 10 62 0 C638 1 130 166 00 FILM 0 0024MF 2 1007 C641 1 130 165 00 FILM 0 0022MF 2 100 0111 8 719 210 20 DIODE 10YG2 0 642 1 130 165 00 FILM 0 0022 2 1007 D112 8 719 210 20 DIODE 10YG2 0 C643 1 130 165 00 FILM 0 0022MF 2h 1007 0113 8 719 210 20 DIODE 10YG2 0 C644 1 130 165 00 FILM 0 0022MF 2 1007 0114 8 719 210 20 DIODE 10 62 0 0115 8 719 210 20 DIODE 10YG2 0 645 1 130 164 00 FILM 0 0012 2 100v C646 1 130 163 00 FILM 0 0011MF 2 100V 0116 8 719 210 20 DIODE 10YG2 0 C647 1 130 131 00 FILM 0 0016MF 2 1007 0117 8 719 210 20 DIODE 10 02 0 C648 1 109 692 00 MICA 620PF 2 500V 0151 8 719 210 20 DIODE 10YG2 0 C701 1 131 520 00 TANTALUM 22MF 20 160V D152 8 719 210 20 D
31. FER AMP2 1 Q201 203 204 Anat decl Q206 208 210 o E 1 RV ee The capacitance values marked are decided by setting the units 0 to 4 0900 53 1 3 53 1 4 2235175 CH 3 OUTPUT BUFFER 0114 3 BUFFER RVv603 4 7 HIGH 2 CH 2 OUTPUT BUFFER CH 2 BUFFER AMP3 Q307 B VOLTAGE REG 0701 705 B VOLTAGE REG 0706 710 B4 VOLTAGE REG 0753 1755 BASS BOOST p 4 Beh B VOLTAGE REG Q756 760 MUTING DRIVE Q802 MUTING DET Q801 S8 MUTING 8409 15 1 0110 0110 0 02 0 1 R506 24019 R503 208 156 R5I2 36k 1 CNJ6 bo 07 015 25 244 0153 25 884 8155 9160 0 54 25 893 0155 2501963 8153 CNJ7 or ror 9 05 04 03 02 CNJ6 R CH RI54 0151 RIS WEBB R25I 10 020 mer We E 54 2 2 54 2 1 4 2 3 54 2 4 0155 833 32 8351 357 219 18 5 055 FS 8 1 lex p 07020 B c 035 835 28 TECTUM 09 08 07 06 15 05 04 0302 CNJ8 07 06 05 04 02 Qi CNJ u 1 e R457 S 2 5 0160 T x x1 DI60 5 2 3 55 2 4 07020 gt 56 2 3 56 2 4 0165
32. IODE 01 06 2 0253 8 765 020 00 TRANSISTOR 254884 0801 8 719 230 02 DIODE 30022 0254 8 729 309 36 TRANSISTOR 2SA1027R D802 8 719 230 02 DIODE 300 2 Q255 8 765 222 20 TRANSISTOR 25 1963 0803 8 719 230 02 DIODE 30DF2 0256 8 765 640 10 TRANSISTOR 25 244 1 0804 8 719 230 02 DIODE 30DF2 0258 8 765 020 00 TRANSISTOR 254884 0805 8 719 510 10 DIODE 518810 0259 8 729 309 36 TRANSISTOR 2SA1027R D806 8 719 200 02 DIODE 10E 2 Q260 8 765 222 20 TRANSISTOR 25 1963 0807 8 719 815 55 DIODE 151555 Q301 8 727 313 07 TRANSISTOR 2SK42 3 D851 8 719 230 02 DIODE 30DF2 Q304 8 727 313 07 TRANSISTOR 2SK42 3 D852 8 719 230 02 DIODE 30DF2 Q307 8 727 313 07 TRANSISTOR 2SK42 3 D853 8 719 230 02 DIODE 30DF2 Q310 8 727 313 07 TRANSISTOR 2SK42 3 0854 8 719 230 02 DIODE 30DF2 0351 8 727 313 07 TRANSISTOR 2SK42 3 Q354 8 727 313 07 TRANSISTOR 2SK42 3 Fl amp 1 552 078 00 TIMELAG FUSE Q357 8 727 313 07 TRANSISTOR 25 42 3 PTI A 1 447 056 00 TRANSFORMER POWER 0360 8 727 313 07 TRANSISTOR 25 42 3 0401 8 727 313 07 TRANSISTOR 25 42 3 0101 8 765 640 10 TRANSISTOR 25 244 1 0404 8 727 313 07 TRANSISTOR 25 42 3 Q103 8 765 020 00 TRANSISTOR 2SA884 Q407 8 727 313 07 TRANSISTOR 2SK42 3 0104 8 729 309 36 TRANSISTOR 2SA1027R 0410 8 727 313 07 TRANSISTOR 25 42 3 0105 8 765 222 20 TRANSISTOR 25 1963 0106 8 765 640 10 TRANSISTOR 25 244 1 0451 8 727 313 07 TRANSISTOR 25 42 3 0454 8 727 313 07 TRANSISTOR 25 42 3 0108 8 765 020 00 TRANSISTOR 254884 0457 8 727 313 07 TRANSI
33. IODE 10YG2 0 0153 8 719 210 20 DIODE 10YG2 0 C702 1 123 687 00 ELECT 2200MF 20 16V C703 1 131 520 00 TANTALUM 22MF 20 160V 0154 8 719 210 20 DIODE 10 02 0 C704 1 123 687 00 ELECT 2200MF 20 16V 0155 8 719 210 20 DIODE 10 02 0 C706 1 131 450 00 TANTALUM 20 35V D156 8 719 210 20 DIODE 10YG2 0 C708 1 131 450 00 TANTALUM 1MF 20 35V 0157 8 719 210 20 DIODE 10YG2 0 0158 8 719 210 20 DIODE 10YG2 0 NOTE CAPACITORS Items with no part number and no des All capacitors are in uF Common ca cription are not stocked because they pacitors are omitted Refer to the The components identified are seldom required for routine service following lists for their part numbers by shading and mark Aare an MF uF PF uuF 183 Items marked 6 are not stocked since 2 critical for safety thev are seldom for routine RESISTORS eee part service Some delay should be antici All resistors are in ohms p Qa Lue pated when ordering these items 1 4W 1 8W and 1 16W carbon resistors Due to standardization parts with part are omitted Refer to the following numbers 4 244 G44 XX or A AAAA AAA X lists for their part numbers may be different from those used in the COILS set nonflammable MMH mH UH uH TA D900 ELECTRICAL PARTS ELECTRICAL PARTS Ref No Part No Description Part No Description 0159 8 719 210 20 DIODE 10YG2 0
34. K 13K 20K 10K 13K 20K 10K 13K 20K 10K mH UH 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 H 1 4W 1 2M 1 24 1 24 1 4M 1 44 1 2W 1 24 1 24 1 24 1 2 1 2W 1 24 1 2M 1 24 1 24 1 2M 1 04 1 24 1 24 1 24 1 24 1 24 1 24 1 24 1 24 1 24 1 44 1 20 1 20 1 24 1 4 1 24 1 24 1 24 1 4 1 2M 1 24 1 24 1 44 1 44 1 44 1 44 1 44 1 44 1 44 1 44 1 44 1 44 1 44 0900 ELECTRICAL PART ELECTRICAL ARTS ELECTRICAL PARTS Ref No Part No i art Description Ref No Part No Description 211 1 214 159 00 METAL 13K 1 1 40 eU Du R280 1 214 816 00 METAL 10 15 1 2 TE R281 1 214 848 00 METAL 220 1 1 24 214 1 214 844 00 METAL 150 1 En 8283 222211 METAL iU ub 12 R215 1 214 869 00 METAL iod 90 24 um ace E 1 6K 1 1 2 R284 1 214 840 00 METAL 100 1X 1724 16 1 214 869 00 METAL 2218 1 214 816 00 METAL 13 er ne aS a R219 1 214 816 00 METAL 10 15 1 2 R220 1 214 848 00 METAL 220 1X 1 2 28 R22 1 214 840 00 METAL 100 1 1 2 CP EUN 214 158 00 12K 1 1 40 R222 1 214 840 00 METAL 100 1 R223 1 214 840 00 METAL 10 1 e R224 1 214 844 00 METAL 150 1 1 2
35. LINE 1 1 CIRCUIT DESCRIPTION The TA D900 is an electronic crossover network designed for use in multi amplifier stereo systems The input audio signal is divided into a number of different frequency bands each band being amplified independently and passed on to individual speakers See Fig 3 for an outline of the circuit diagram Each set of crossover frequency filters have been incorporated into separate plug in type units Suitable crossover frequencies for a wide range of speakers available on the market may be set by plugging in an appropriate combination of the 4 different units The crossover frequency of each unit is de termined by the capacitance of the filters and the frequency selector switches 51 54 For 2 way to 4 way multi amplifier systems the crossover fre quencies are set by adjusting 51 54 and by arranging the filter units in accordance with the crossover frequencies of the speakers employed Levels are also adjusted to match the efficiency of each speaker Note that the following description refers to a 4 way multi amplifier system 1 Pre buffer Amplifier Stage see Fig 1 0101 25 244 0104 254893 0103 25 884 0105 25 1963 PRE BUFFER L CH 8109 B 220 RIO 100 010 10 020 Fig 1 The purpose of the pre buffer amplifier 0101 103 105 D104 is to eliminate the influence of the preamplifier and connecting cord upon the filte
36. METAL 8225 1 214 844 00 METAL 150 1 1 24 EO MED Ne R228 1 214 869 00 METAL 1260 I 1029 R309 17214 16020 METAL CE EV 214 160 15k 1 1 48 8227 1 214 869 00 METAL 8229 1 214 816 00 METAL E EIS ETAL E R230 1 214 816 00 METAL 10 1 1 20 R3 8231 1 214 848 00 METAL 220 1 1 24 TE R232 1 214 840 00 METAL 100 1 1 8 E 115142180000 METAL IM ae ls 214 159 1 1 A 8233 1 214 840 00 METAL 100 1 1 28 234 112141840200 METAL 100 1x 1 24 Rale 1 214 186 00 METAL 15 17 R236 1 214 840 00 METAL 100 1 1 2W R317 1 214 159 1 214 159 00 METAL 13K 1 8251 1 214 156 00 METAL 10k 1 8252 1 214 159 00 METAL DK Odo R319 1 214 186 00 METAL jk 12 R253 1 214 163 00 METAL 20k 1 214 1 8254 1 214 156 00 METAL 10k 18 S ETE R255 1 214 159 00 METAL 13K 1 4 8322 1 214 156 00 METAL 8256 1 214 163 00 METAL 20K 1 1 44 R323 1 214 159 00 METAL m s ques 8257 1 214 156 00 METAL 10k 15 1 4 R324 1 214 163 00 METAL x Ve 8258 1 214 159 00 METAL 13K 4W 214 R259 1 214 163 00 METAL 20k 1 1 44 1 214 902 00 MEE ZA n Vou 8260 1 214 156 00 METAL IOK 1 1 4W R331 1 214 913 00 METAL R26 1 214 159 00 METAL 13k l 1 40 R332 1 214 872 00 METAL 12 12 R262 1 214 163 00 METAL 20k 159 1 4M 8335 1 214 872 00 METAL 2 2K 1 1 2M 8263 1 214 844 00 METAL 150 1 1 2 8339 1 214 840 8264 1 214 844 00 METAL 150 1 1 28 R351
37. STOR 25 42 3 0109 8 729 309 36 TRANSISTOR 25310278 0460 8 727 313 07 TRANSISTOR 25 42 3 0110 8 765 222 20 TRANSISTOR 2501963 0501 8 727 313 07 TRANSISTOR 25 42 3 Q111 8 727 313 07 TRANSISTOR 2SK42 3 Q114 8 727 313 07 TRANSISTOR 2SK42 3 Q504 8 727 313 07 TRANSISTOR 25 42 3 0551 8 727 313 07 TRANSISTOR 25 42 3 0554 8 727 313 07 TRANSISTOR 25 42 3 Q701 8 729 376 02 TRANSISTOR 2SD760 Q702 8 729 167 62 TRANSISTOR 2SC2676 NOTE CAPACITORS Items with no part number and no des All capacitors are in uF Common ca cription are not stocked because they pacitors are omitted Refer to the The components identified are seldom required for routine service following lists for their part numbers by shading and mark Aare Items marked are not stocked since critical for thev seldom required for routine RESISTORS ME part service Some delay should be antici A resistors are in ohne Conmon numo Ers Sp 5 pated when ordering these items 4W 1 84 and 1 16W carbon resistors Due to standardization parts with part are omitted Refer to the following numbers A AAd AAA XX or A AAAA AAA X lists for their part numbers i i COILS may be different from those used in the set uH Ref No 0703 Q704 0705 0706 0707 0708 0709 0710 0751 0752 0753 0754 0755 0756 0757 0758 0759 0760 0801 0802 2101 R102 R103 R104 R105 R107 R108 R109 8110
38. ed when exchanging units will reach the speakers BASS BOOST frequency response select cover Response in dB 20 50 3100 200 500 Frequency in Hz Fig 6 Fig 5 90 1 2 BLOCK DIAGRAM 4 PRE CH 4 BUFFER AMP 98urrtR AMP1 1L Pa 0101 103 105 0501 T ews S3 2 2 tawo WHEN SETTING UNIT 4 FLAT S3 1 1 3 L ANN BUFFER AMP2Le 0404 2241 9 Lo aiit S2 2 5 y 500Hz 27 52 2 4 ov t lo 52 2 1 S2 freq 2 IkHz 1 WHEN SETTING UNITS S2 1 1 2 4 CH 2 2 D RE Y BUFFER 1 BUFFER 216 4 S 0301 0304 A HF AM 1 51 2 3 2 3 5 2 5 Lo Twe Wo O AMW Lui E 5 MW 77 wwo 51 2 4 O 9 AM M 1402 si 225Hz WHEN SETTING 1 UNIT 280Hz FLAT 5 1 3 51 1 4 5 1 5 5 1 2 i 5 M o ow cn i Se BUFFER AMP 1 o W 4 e BUFFER 2 lt 2201 203 204 Laio OMA 9206 208 210 088 2 Lo oe ze s T
39. gnal line and thereby prevents the appearance of any signals at the output terminals when the power switch is turned on and off The pop noises generated at this time are therefore completely silenced Note that this muting circuit is designed to release the output line from ground when the muting relays RY1 RY8 are In addition whenever the frequency response select cover is opened to exchange filter units 58 is switched off and again prevents the appearance of any signals at the output terminals 1 When the power switch is turned on a As soon as the power switch is turned on will commence to charge up C805 will also commence to charge up requiring 2 to 3 seconds as determined by the R804 C805 time constant to be fully charged During this period Q801 and Q802 will remain off thereby keeping the muting relays 8 off as well Therefore no signals will appear at the b c 2 a b TA D900 output terminals effectively muting out the power switching noise 2 to 3 seconds after turning the power switch on the potential on the base of Q801 reaches potential resulting in this transistor turning on As soon as Q801 is turned on Q802 is also turned on resulting in muting relays RY1 RY8 being turned on and the output signals appear at the output terminals When the power switch is turned off At the same time that the power switch is
40. nce current mirror loaded 2 stage differential amplifier similar to the pre buffer amplifier 0101 103 105 D104 The crossover frequency is selected by the freq 1 switch S1 thereby defining the frequency band The filter output signal is then passed via the level adjustment control RV601 on to the output buffer amplifier Q106 108 110 D104 where the impedance is again converted and finally appears on the J102 output terminal The role of this output buffer amplifier is to maintain the crossover frequen cy and the input impedance of the power amplifier 0900 3 MID LOW Channel Stage CH 2 The signal whose impedance was converted in the pre buffer amplifier is narrowed down to a frequency band between fi and f2 according to the freq 1 and freq 2 settings see Fig 3 2 Both the high pass filter and low pass filter feature sharp cut off curves of 24dB oct 12dB oct cut off characteristics in filters 2 1 2 2 2 3 and 2 4 IN PUT 0105 10 2 0 The basic circuitry employed in the buffer amplifiers in each of the filters in the MID LOW channel stage is outlined in Fig 2 Each of these buffer amplifiers source follower amplifiers employing constant current diodes and FETs design ed for high frequency circuits The cascade connect ed high frequency FET is used at the source follower and a 100 negative feedback is applied for high input impedance and low o
41. rs With 100 negative feedback applied to the first stage differential amplifier Q101 by resistor R107 100 9 the pre buffer amplifier has high input 1 OUT PUT impedance and low output impedance In addition a current mirror loaded 2 stage differential amplifier structure reduces distortion to a very low level Furthermore in order to make the low channel amplifier a pure DC amplifier employing no coupling capacitors a dual FET differential amplifier which suppresses DC drift has been used in the first stage Q101 Dual transistors have also been used in the second stage differential amplifier Q103 and current mirror 0105 to further suppress DC drift connecting the base of Q104 to ground the collector voltage of the PNP transistor on the left hand side of Q103 is reduced to almost OV thereby equalizing the collector voltage of both PNP transistors 0103 The dual transistor Pc power input dc to collector are therefore very much the same resulting in the amount of drift in both sides being balanced The impedance converted signal is then passed from the pre buffer amplifier to CH1 CH4 where it is divided into 4 different frequency bands 2 LOW Channel Stage CH 1 The low pass filters employed in this stage achieve a very sharp cut off slope of 24dB oct 12 dB foct at filter 1 1 and again at filter 1 2 See Fig 3 1 Each low pass filter buffer amplifier has a high input impedance and low output impeda
42. t 52 2 kHz SETTING FLAT UNIT 2 e 52 1 1 2 1 2 2 CH 2 VWA lt HHH BUFER AMP 1 HH BUFFER AMP2 ma pu we Pes Wao ST 51 25 Hmon iai Hmon 5 23 5 7 Pwo Wo 9 e1 T 5 ema gt Exi 5122 77 124 lo J 51 trea 1 140 Hz WHEN 4 SETTING 225 Hz 4 UNIT 1 7 d 280 Hz 4 FLAT 1 13 81 14 51 15 L VS 1 MAG ow lt BUFFER v 2 m a201 203 EV ied 1 2206 208 210 x ond gt P S gt T T E hr RV LOW Channel Fig The capacitance values marked are decided by setting the units O to 4 0900 our4 Fig 3 4 3 1 3 53 1 4 53 1 5 d BUFFER 4 OUTPUT 1104 out3 Buren e e 42 6 Neo On 1 o bx es 603 HIGH MID HIGH 52 14 52 1 5 2 m OUTPUT AMP3 0 IW BUFFER AMP 4 Oui B FFER AMP J103 0012 Nveo Oe Q310 Q1 o o4 cf RV 602 h HIGH _ 4 MID MID LOW Fig 3 3 Fig 3 2 TA D900 SECTION 1 OUT
43. turned off the positive potential which had been applied to the cathode of D807 via D806 de creases resulting in the D807 diode being turned on by the forward biasing The charge on C805 is consequently discharged via D807 and R807 resulting in Q801 and Q802 both being turned off The muting relays are also turned off preventing any output signals from appearing at the output terminals The pop noise generated when the power switch is turned off is also effectively muted H F H gt H 25 ae quos 2 uu POWER TRANSFORMER FA T us 4 MUTING 0802 258734 7 QM RELAY DRIVE 15 0807 151555 0805 SIRBAIO Fig 4 TA D900 3 When the frequency response select cover is 7 Bass Boost Circuit opened Fig 5 LOW channel stage CH 1 contains the bass boost circuit which compensates for low frequency of the speakers this circuit response in dB at frequency of 50 Hz becomes 6 dB at maximum in steps of 1 5 dB owing to the T type filter in NFB loop negative feedback loop of the output buffer amp When the frequency response select cover is opened S8 is turned off thereby cutting off the voltage being applied to the muting relays RY1 8 These relays are therefore turned off and no signals will appear at the output terminals So none of the noise generat
44. ue to standardization parts with part are omitted Refer to the following numbers A AAA AAA XX or lists for their part numbers m y be different from those used in the ne set nonflammable TA D9Q ELECTRICAL PARTS ELECTRICAL PARTS Ref No Part No Description Ref No Part No Description R365 1 214 163 00 METAL 20K 1 1 4 1 214 160 00 METAL 15K 1 1 4W R366 1 214 156 00 METAL 10K 1 1 4W 1 214 165 00 METAL 24K 1 1 44 R367 1 214 159 00 METAL 1 1 44 1 214 153 00 METAL 7 5K 1 1 4 R368 1 214 163 00 METAL 20K 1 1 4W 45 1 214 155 00 METAL 9 1K 1 1 4W R369 1 214 156 00 METAL 10K 17 1 4 R459 1 214 160 00 METAL 15K 1 1 44 R370 1 214 159 00 METAL 196 17 1 44 R460 1 214 162 00 METAL 18K 1 1 4W R37 1 214 163 00 METAL 20K 1 1 4W R461 1 214 165 00 METAL 24K 1 1 49 R372 1 214 156 00 METAL 1 1 4W R462 1 214 169 00 METAL 36K 1 4W 8373 1 214 159 00 METAL Y3K 1 1 44 8463 1 214 156 00 METAL 10K 1 1 44 R374 1 214 163 00 METAL 20K 19 1 44 464 1 214 159 00 METAL 13K 1 1 4W R375 1 214 872 00 METAL 2421 14 1 2 8465 1 214 163 00 METAL 20K 1 1 4 R378 1 214 872 00 METAL 71 1 6466 1 214 156 00 METAL 10K 1 1 4W R381 1 214 913 00 METAL 100K 1 1 2M R467 1 214 159 00 METAL 13K 1 1 4W 8382 214 872 00 METAL 2 2K 1 1 2W R468 1 214 163 00 METAL 20K 1 1 4W R385 1 214 872 00 METAL 2 2R 21 1 2W 6469 1 21
45. utput impedance The load for this amplifier is D105 And since it is a constant current load there is very little distortion and no interference from the filter unit power sup plies Since there is no need to operate the MID LOW channel stage anywhere near the DC region coupling capacitors have been employed prior to the RV602 control and the output terminals thereby cutting DC drift and DC offset The capacitor employed in front of RV602 consists of a tantalum capacitor C305 connected in parallel with a film capacitor C306 and has been inserted in order to prevent deterioration of sound quality OUT PUT 6 Fig 2 B The MID LOW channel stage employs an out put buffer amplifier 0111 in the output stage for the same reason as the LOW channel stage 4 MID HIGH Channel Stage CH 3 The MID HIGH channel stage employs the same basic circuit structure as the MID LOW channel stage The frequency band between the f2 and 13 crossover frequencies is set by the freq 2 and freq 3 switch positions see Fig 3 3 5 HIGH Channel Stage CH 4 The circuitry of this stage is basically the same as the high pass filter and output buffer amplifier employed in the MID HIGH channel stage The fre quency band is determined by the f3 crossover frequency set by the freq 3 switch position see Fig 3 4 6 Muting Circuit Fig 4 By activating a relay circuit the muting circuit disconnects the si

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