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Telex BTR-200 Series Network Card User Manual

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1. a 3 15 Receive Assembly 676522 Pants tu u u uu uu e a PCB Receive Assembly 878662 T AS 3 24 Audio Board pude tese 3 27 Audio Board Circuit Description 3 27 Receive Expand nora it 3 27 Microphone ADD a Auxiliar Input Im HE id 3 27 Intercom Di uu Z abc nc ERO Ur rU Fi REI 3 21 O eer 3 28 Headsetand Speaker uu uyu ota Z near rsen aqu na 3 28 Transmit Mixer and Filter X 2 28 Sapa mt qapa upa alaq 3 28 Remote si u aus upa DOR ee eee 3 28 Power SUDD k M 3 28 AMC PROCS e uyu ttem p 3 29 Ea pe arcte enm PD 3 29 zi PR c Pe v FF rn um ee 22 0 n w r Page Chapter 3 Transmit Receive amp Audio Circuit Boards Continued Audio 22 0 24 1 02222221 0010 160000000 eee ada a sess s sois iD tea Continued PCB Audio Assembly 878520 Versions I thru 6 Parts List esee enn 3 45 Display Board 3
2. Kon 1 i E e c ii i 3 E STE 1 m 1 zl L M i L 1 i 11 Z 1 x L QX TL E i ig ue wer i A a r lL Ia foe tT a if CIB l 1 27 L z A101 0 T Q J I J 1 k mix sit LL SUL t x A EXCEL EY Al Me 4 She MEd Run Ln CET ZU OD SIZE vU Jd 7 sat BS p X tL So mid K SN 2 AA UU POR EN MM C ft ERN Ho y iW ae one n n A m Dam Y gt k m ut E bim es 1 eo 207 9544 AB Bm 2 aa Moe m m i E DIED Some EY uo I S l gU i LI cae eSI Sie poe L m tr r m 4 i ean EL w demit 22 Sete VT qe _ mr ed LH A u EN four j a HR nem EE e AA IDLE EM I CI 8 CEU m I why at TIN AA m T
3. d UA n IOS SA ar Hh e i E ER L INN ue 79 Hp FC TINS F i ote M ON ul NM ACAD uui Hi A es i ME M BLAN UI UU mL pense Se DT LL dd m MM I pee FIGURES 26 AND 27 FOR DIFFERENCES IN VERSIONS 3 4 AND 5 NOTE Fieure 28 Audio Board Component Layout Side Version 6 3 40 te U112 A C183 10PF NES7 ih PORTABLE C159 e 10 SELECT E 10 au EL 128 2 R130 TI el 5105 jour 1 5K Sa R195 ES ins pet 21945 R196 C182 4 5 100K lt 1006 de 10UF 7 PORTABLE 1 1 zm 4 MPS3702 SER J103 2109 zl unzc 56 pnis 7 AUX OUT 3 3K C160 PORTADLE 2 SELECT 10UF 1120 27 6174 mus isa gt 5 5108 nu J108 k 100K gt 100K 0156 PORTABLE 2 UF U113 A 1 G167 NE575 T gt gt PORTABLE 3 R225 118 ci of 1K ME h T unsa SELECT Z 5532 01133 TOUF NE575 C175 C178 gt 10UF 5707 103 1 5K M gt T C198 ES L R202 2 5 620 re s 100K gt 100 00180 t 169 POR1ABLE 3 E W 1000 T Z vise i lice R185 P3 575 30K 10K T LY Eu pecs Jno gt R204 2
4. 2044 Y 4 Win L47 o fo 1321 b si Y TAS yao OMV MA Ag E LA a JE IN y nar HERI UI E qp SS ART M En t n NRE UT ee R493 4 sy LL 5 UY a OR R383 7 1 1 A K o Ly 8 n MEA 52 Cs 0424 gt gt DIA in 230924 Z igh fy 170374 Eu 27 wg r o eC 47777 6389 CIP Ae RING h t EL i if 14 E i n EE lx CRL oq A pe SI VE 18 O 2 NE Ail 1 NI Y ean 2 1 Sha Bly FUN r ti ST SEG pro pp o dp oo 0 d gl ej UE EI At Li BE Opn vm 1 EC P AE A OES 43 7 GE3 e NU Win f 1 53261 eR po 20416 7 mt Ss Tb Goss MENO So 2 Ae gt 0 05 60 HH U x 66 M 25 98 Ji F j e To ce 8 d 3 Ao qi bk oes EA Aq uiid 2520226 Qo RG D YSI gd EM io TE US yw ix SS UTR 3 Sard
5. B is 555975 5108 our 330 OUF REMOTE 5111 3 4168 18 OFF o cor nina 1 10K lt 100K j 1K TRANSMIT PORTABLE 2 UF AUDIO LEVEL j R162 8183 UVA 3 10K t k 1 525 100PF i PORTABLE 3 I TRANSMIT HOARD J112 4 of 10 y cuna SELECT x UE nd 10UF 1688 6178 0178 8157 sour 107 10UF Ay in P 2 166 9 Bii L jroo R202 8532 R261 190K gt 100K 1K 0189 PORTASLE 3 C106 100UF T 4115 17 ET I CA101 vi Pm 51 RIBS 1 Fo NES75 3 6K ma ow SELECT a ET od tour wen 1 e 190 E M ae our sioe sour 10K B B INTERCOM 1 R151 IHTERCOM RIBS R203 2 R205 ma GAIN 100K e OVERLOAD 1 1K 01802 245 9180 0151 0902 RAO 0402 e 5 1292 21 2132 f104 aurip 4 1 8154 2 0128 pio BALANGE I 1N4148 R187 TIEN 12K lt 10 gto FIM Sur y RESSS2 gt 25k C120 100PF tour ab 1 20 imy uma 2m R122 C113 R123 ie 4 150K R158 C135 TE t jk lt ei 180 105 our 112 Y R135 1238 fier We L4 AA 5192 1007 560 WF U107 A 2i R 8239 WE3532 U 6197 954 amu 8157 1 2134 8168
6. L L COME 5 D ul lt nse gt TC ab 0441 0448 i R3 i Jt mM 10K Troup E 1 uu cl L o o SL 21 nar DD1SLIF R376 10K n 4311 ird MPS2704 C451 Figure 13 L Schematic Diagram Receive Board _ ___ _ __ _ _ __ 70714000 PCB Assembly 878522 da C304 Cb 0 303 p eo oo C377 zio 2200 0 C306 C3230 0 E ect gas 4 ocs 9 9 c32er 243 R31 8985 5 Q 1303 5 B oO TS L305 O 4 2 oa 5316 sf E 5 5 e amp R332 3061103 FL304 59 3 1502 3 1304 FL3070R3 680 988 Japon 955 556 Japos Lees _ 886 o a 985126 425 2 52 1506 CE Es E g 22325636502 Es lo ogg ys E ER 250 O 52000 FL301 R314 Ferd ORS 1 Ex 58 NES 202 Es P313 v6 303 5 9 9 R3D3 R302 C308gep 99301 R304 a E q o gt Fil a 1304 lo __ jp Es 4 t 9 030216 A 317 C319 ORIOIG 3 17 lon o 0 el 2 dp 9 C340 Ty 9 e pc 4T R345 R346 72 C385 R327 9832890 OR3
7. 148 FEL 4104 J105L C15a 4113 o ee Esta A122 o2 J103 255 R194 20000 Pf C101 02 s m O R171 R192 e O cw __ ES mm U101 P 0000 o E 5 R101 O i of lo 52 209 eint d C155 o lo R188 cle 108 9143 2 9110 C107 Es Q z C120 el 113 PSN lens i k a Sh am 0 114 0102 8120 lt gt 0105 Ris 108 gf o lt gt ay o lo lt gt aaa o o 159 C181 8137 ras lt gt o a C165 9103 C gt o o 5 O Ri4e C11 A220 C188 ol la ol lo A jo cis C162 o 0 188 9185 P107 7 O oj o o o E nim 8219 Q 194 9 R119 o m 50 cla 9 9 9 9 are o o ol lo B a R 35 ci ol Aja cain N Ri50 a 9110 maD e n 029 cum FS O in 9 pts le LJ Apres R203 R151 o lt gt n n222 lt gt a 9991 P102 2 R198 a AE 5 Y 0 00 U106 e 9118 ol 9900 0115 091 A215 a jo Ra 183 108 109 J110 U 25 me 204 5183 gt gt e lo YH101 C128 o R152 cih 8 A190 lt gt o jo SEE 59 gt R21 o FIGURE gt 154 114 R162 A lt gt 182 4 nu R121 m25 lt gt cua
8. os Este L306 C306 1212 e 1303 1302 j gt C309 gt C313 lt lt gt 1305 c2 5 A308 304 ACA Wm EN D Es osos oie cima Sir AS 4 PO A nd E LEON 4T COM C abt ICON EPS be al VEs08 que ait Jb 4 m XL iae CJ gc iMi rn 31 0 d 91 15 ao T paot ve roc 1B 204 2 Meant 0 CU ad a Ly dE lt gt Root 6303 6302 1 acas A303 r cee 58 2 10 0302 2419 i Ez R306 1307 308 147 0319 2303 1371 2 gt s araw e R430 URAI E T E 1 7 A TERT NE 19420 to Rago lo 02000902 Beso 73 R pam a x 1423 I s CX EU 1 2323 i f c wa MC us UE y ROSE AY ROR baog gt RAZO case ORT NE C ac ST SOF caso TTT ge TRE bd A y C420 oJ pe 1 2338 I t ANY QU C369 TEREE mi H i 1 I i ut i tn i YE ICF420 Y n wc Fab ICF470 1 20 0320 d caro ao
9. C118 C120 C121 C122 C123 C124 C125 C126 CI32 C13312 C133 PCB Audio Assembly 878520 Versions 1 thru 6 Description Printed Circuit Board Audio Capacitors Electroly c 2 2 Poly film 0022 Ceramic 100 pF Electrolytic 1 Ceramic 01 Electrolytic 1 Electrolytic 10 Electrolytic I Electrolytic I Electrolytic 1 Ceramic 100 pF Electrolytic 100 Ceramic 100 pF Ceramic 47 pF Electrolytic 22 Ceramic 01 Electrolytic 1 Electrolytic 16 Electrolytic 1 Electrolytic 1 Blectrolytic 47 Biectrolytic 1 Ceramic 100 pF Electrolytic 1 Ceramic 100 pF Ceramic 1000 pF Ceramic 100 pF Ceramic 27 pF Electrolytic I Electrolytic 10 Electrolytic 22 70723000 All capacitors in microfarads unless noted 51821107 52719053 35693019 51821106 52676107 51821065 52723008 51821106 51821065 1821106 35693019 52723004 35693019 35693015 52723009 52676107 51821065 52723008 51821106 51821065 51821105 51821106 35693019 51821065 35693019 35693030 35693019 33693012 51821106 52723008 52723009 159 162 C163 C164 C163 C167 C168 C169 C170 Ci71 CI178 181 C182 C183 C184 C185 CiB6 CI8812 195 213 Ci95 C19679 19739 19836 C206 C209 Electrolytic 10 Ceramic 100 pF Electrolytic 1 0 Electrolytic 100 Electrolytic 1 0 Ceramic 100 pF Electrolytic 1 0 Electrolytic 100 Hlectrolytic 1 0 Electrolyti
10. R301 R302 R303 R304 R305 R306 R307 R308 R309 R310 R311 R312 R313 R314 R315 R316 R319 R320 R321 R322 R323 R324 R325 R326 EE Description Crystals and Filters Crystal Filter Insulator Crystal Insulator Mixer ASKI Crystal Reeeive 171 005 MHz Crystal Receive 207 8 Crystal Receive 213 8 MHz Crystal Receive 10 245 MHz Crystal Receive 12 015 MHz Crystal Receive 11 53 MHz Crystal Receive 12 815 MHz Crystal Receive 2 155 MHz Crystal Receive 12 555 MHz Crystal Receive 12 955 MHz Filter 10 7 Crystal Filter 455 kHz Ceramic Filter 11 56 MHz Crystal Filter 11 075 MHz Crystal Filter 11 56 MHz Crystal Filter 11 075 MHz Crystal Filter 455 kHz Ceramic Filter 12 36 MHz Crystal Filter 11 7 MHz Crystal Filter 12 36 MHz Crystal Filter 11 7 MHz Crystal Filter 455 kHz Ceramic Filter 13 1 MHz Crystal Filter 12 4 MHz Crystal Filter 13 1 MHz Crystal Filter 12 5 MHz Crystal Filter 49595 kIIz Ceramic Not Used E 450471 450474 760382 780092 1 780092 2 780092 3 780088 780088 6 780088 3 780088 7 780088 4 780088 8 780088 5 780087 0 723088 780087 4 780087 7 780087 4 780087 7 723088 780087 5 780087 2 780087 5 780087 2 723088 780087 6 780087 3 78008 7 6 78008 7 3 620088 52154060 52154036 52154096 52154108 52154060 52154301 52154048 52154036 52154084 2154068 52154036 52154052 52154020 32134058 52154076 52154016 5215
11. RUP GU sas UE me Rigs gt citi 100 PORTABLE i _ gamsi 103 ANG PORTABLE 2 AUX SELECT I NESTS IM 124 pn 5108 yp 4 7 REMOTE 5311 noa 1 gt OFF 9 Lr 1008 CONT PORTABLE 2 T 1 i V qpaes ur C187 T mika L 5 3 a 1 PORTABLE 3 U115 A 2112 QI MM Md 7 Ug SELECT R228 my q 19UF TIE RIJ 33k HE5532 TRANSMIT gt gt ti d 200 R207 6708 Ms b s MX HOK 3 PORTABLE 3 orl EN ONH YE LERS 2185 RECENT RESTS PORTABLE 4 36k BOARD I 1 ciiz SELECT TOuF CT VHS axi a WF syoB Yer page 3110 INTERCOM REUS OmERLCIAD cron S WOK INDICATOR gu gt pir o E 5802 I a n I I 0101 a Ms NOTE COMPONENTS IN DASH gis Ly CH MOR 128 Pil4 sane Do NES552 140 91028 BAN R23 BORDER AREAS ARE LOCATED ON HE HESSI 1 ma 4 mo THE DISPLAY BOARD me set23 HEL gt yo TF 155 4 10K R238 6125 2 1 RHB Seay Ya 2154 RISA AUF 104 51049 uel 5 I 1161 51042 S104 ar 20128 gt RUF m 51043 51045 SVDS E gt
12. obs gee 4 n gs 9o 2 D lbs ROMs vom E dir s ines vo 20 5 gm s Bs IUE DHL O 9 oa 59 oes Tie Peng Oo 9 D 9 Bi did L 70714 000 SIDE REV A Figure 6 Location of Rev Level for Versions 1 and 2 Early production units came with 70714000 and 750309 Rev A boards are verston 750309 was installed in later units 70714000 came in two versions that differed slightly See 750309 Rev B and C boards are version 2 below Some early version 1 boards did not have a shield Version 2 was built only with Rev C boards over the oscillator section Version was built with Rev B or C boards The different revisions on this board were manufac turing changes that did not change the schematic 70714000 R381 VR302 Version o r EUM 2 2 TRANSMIT BOARD S A i u 70724 000 REV A COMP Figure 7 Location of Rev Level for Versions and 2 Rev A boards are version 1 Rev B boards may be version or 2 R503 Rsa csa 30 S 772 31 BOTH SIDES TYPICAL 3 PLACES e 32 31 TYPICAL 4 PLACES PCB TRANSMIT 29 10 9 12 9 TYPICAL 10 9 12 4 PLACES TYPICAL SEE DETAIL A 4 PLACES
13. 22Uf 00 150K 194 51049 136 po RIS E RIM M C130 S104 2 4 Tio N 10K Rise 1QUPF RIB 120K a Sid T J Q105 47K tM C 77 20126 c120 5104 40UF P a7 0148 u 510 4n R1 781048 22UF c103 47K O022UF Law C101 INTERCOM 2 2Uf SELECT AUX IH U117 78105 5102 R105 82K 0193 C104 I AUF 1 R206 1 MIC 470 7 g ININCATORS C141 0181 0108 C106 Rig 1UF R208 50 R207 4574 18 2K 47 Q103 mai n MPS3702 VR103 9 100K 2444 R209 1N4004 EXTERNAL AUF 0143 EXTERNAL 19 88 SPEAKER s 3 220UF SPEAKER a7 INTIS VOLUME 4108 R222 1K I PEGI gt _ POWERI 121 u102 8 2 10k gt NESS32 AES T 2 u 100K 6138 5 R178 10 114 5110 quo LAUF 2 im 811078 i oF HEADSET TALK HE NEDSM 10Uf 13K SPEAKER 9 Nona gt hg RPS8704 MPS3704 ls R216 BK R211 cies 28216 Lan R217 100K mue 470 sox 0608 Te T T Od 2 j 1 Ted Figure 24 Schematic Diagram Audio Board Version 2 3 36 RECEIVE BOARO NOTE COMPONENTS IN DASH BORDER AREAS ARE LOCATED ON THE DISPLAY BOARD 3H4004 4 J p t L ale Example FIO POWER F 4107 ASSEMBLY C124 AND C125 WILL BE LOCATED ON THE NOTE VERSION 1 D
14. 35693007 52676113 35693023 51821106 35693023 51821109 51821071 51821525 52676113 51821524 51821065 52676113 35093024 52723008 51821538 52723008 51821106 35693019 52723008 51821109 51821071 52676101 3 45 101 DIDI 5102 D103 D107 D108 D110 D108 D112 Intergrated Circuits 7101 0104 0105 0106 110 11081 01086 11109 0110 ULLI 0112 0113 1114 ulisi 1711556 0116 0117 3118 01192 0118 1011926 Diode 134148 Diode 1144004 Diode 144148 Diode 144148 NE5532AN LM393 NE5532AN IC LM2895P LM383 IC LM392 NB5532AN IC MC34119P IC NE575N IC LM358 IC CMOS 4002 Not Used IC CMOS 4013B 781 05 Not Used NESS32AN Diodes and LEDs Diode Photoelectric VTLSC1 58693001 52228000 85759002 52228000 322285000 53295001 53284000 53295001 760381 59521000 53295001 760374 1 53277003 53227004 53266003 53266095 54660005 53295001 _ m w PCB Audio Assembly 878520 Versions 1 thru 6 Continued Ref No Description Part No R126 52154036 Description Connectors 12 1101 Connector 3 Pin XLR Female 1 59803001 6 32124014 J102 Not Used 1103 Connector 3 Pin XLR Male 59892001 11991
15. 5 6 pF 35693004 2 35 o T d 35693003 Ceramic 43 pF 35603070 Ceramic 1 pP 35693054 C303 Ceramic 82 pF 2007003 Cone PH x pr 52007000 Ceramic 50 pP 55693049 Ceramic 56 35693016 C305 Ceramic 5 pR 52007000 icu 2 Ee C305 Ceramic 33 pP C369 C372 Ceramic 01 52676107 C306 Not Used 373 Ceramic 470 35693026 C307 C308 Ceramic 100 29009019 C37322 Ceramic 560 pF 35693027 C374 C375 Ceramic 24 pF 35693060 E C376 Ceramic 470 pF 35693026 ic 0 5267610 C313 Ceramic 1 2 pF 52007009 oF pid i 3307 Ceramic 43 pF 35693070 23 E C381 Ceramic 01 52676107 C315 Ceramic 2 2 pF 33693000 C382 Ceramic 1 52676113 Ex TER C383 Ceramic 100 pF 35693019 eramic 01 52676107 C318 Ceramic 56 23022019 e 10 52723008 C319 o 47 pF Be C386 Ceramic 1500 pF 35693032 poule ir 35693008 2 2 222 B C388 Poly Film 0022 52719053 C324 Ceramic 9 1 pF 35693056 E 522 C390 Ceramic 330 p C325 Ceramic 10 pF 35693007 C391 Ceramic 01 52676107 3706 C327 Ceramic 01 52676107 Ceramic 43 pF 3 5693070 7328 Ceramic 56 pl 35693016 47 pR 35693015 2329 Ceramic 470 Pf 35693026 Ceramic 230 pF 45693024 C330 Ceramic 82 E See IG C393 Ceramic 390 pF 35603025 o 2d C394 Ceramic 68 pF 35693017 of Use ic 75 pF 35693061 C333 Ceramic 8 2 pF 35693006 5 2 x B C
16. As the level creases so does the gain and this results in a 2 1 linear expander characteristic This complements the processing done in the transmitter The audio 15 then buffered and delivered to the remote select switches Microphone Amplifier From the headset connector the microphone signal is amplified by U103 Depending upon which type of microphone is used 102 is set by the user to dynamic or electret The electret position provides an 11 dB drop in gain to compensate for the extra output The amplifier is peak limiting and responds to either positive or negative peaks ex ceeding about 1 1 volts in amphtude Peak detec tors Q106 and 0107 charge C120 and C121 driving 0105 toward pinchoff This reduces the gain momentarily until the input signal is reduced Visual indication of peak limiting 15 provided D608 which ts driven by U105 when the voitage at pin 6 exceeds half a volt DI11 version 3 and later isolates the time constant of the amplifier from that of the LED driver The latter is much shorter than the former and causes the LED to extinguish im mediately upon removing the input signal On versions 1 and 2 the LED will remain lit for several seconds VR604 15 adjusted by the user for maxi mum input with minimal limiting Q104 is used to turn the microphone on and off and is driven by the push to talk latch circuit When 5110 is pressed in and held the state of U116B follows the switch and turns on 0110
17. JROKCATOR 0102 8167 PORTABLE 4 zj 144446 47K 21 5132 R104 gt 09 Ad 1UF 1M 5 101 185 154 Ja C189 1101 1 Pils 4 UF 5800 tg HEADSET MK 3 123 2 2 2135 0112 R214 wor 360 10K G117 R166 22ur 294 51043 EN RIM pe 5104 2 5104 4 S 10K 2 i 38 Mo S143 104 5 510 Ur 47K lues E 104 7 1048 j c103 gt 5104 6 0022UF INTERCOM SELECT C101 224 AUX I lt JOTA C102 10 8102 HF BRK 29 2 R107 100 105 cioa prop 1UF 47 BER 10K 101 4177 C181 EXTERNAL 02 R183 42295 18K C146 plac Y 11215 U102 B trina PEU 10K 5532 E T TT T 7 7177 6130 gt Ri78 T n LA pe pir 2 1 LIEN 1 Mas pose ek RET 1 Figure 29 p Schematic Diagram Audio Board Version 3 3 4 227 F208 br R209 J112 TRANSMIT 4113 NOTE COMPONENTS IN DASH BORDER AREAS ARE LOCATED ON THE DISPLAY BOARD YT e tee bec LT TS 622 F 109 PORTABLE 1
18. Mur spur Riss Ri cis T 3 mur 26 gt d LOA ms 9104 4 MESSIS i iS Ni 2146 2143 2123 157 nias gt Ke 150K AUF 794 51043 ni pu 8 Dae 4107 MEM Siok 91063 Jd 47H ursi pa NI 2 100PF no E l sgal Example 28 1UF SET w kanaa 1 T TU ei T d 22UF oe ECT 51047 cial I iur external 199 SPEAKER J106 T 2132 142 1 ATE T m en 2156 DO I1 0147 POWER Ger iii 10k al eaim 220 ue RD 14 M HEAGSET E ATA SPEAKER 0110 ee 10 Sa MPEG 7 215 le CM 55 T 0155 pP Figure 23 ei Schematic Diagram Audio Board 1 Version 1 Wawan a O TR X 0163 NES S 1 bord PORTABLE 2 10X SELECT 01128 C172 NES7S qour 105 104 88 6159 9 10K 5 2 ee gt 4109 Miri 0150 67 mes 8107 5 b 100K 100K T 4 ciat PORTABLE 1 MPS3702 1UF 3 4103 o 20 R210 ner U112 C 1 m NE525 AUX OUT gt C160 PORTABLE 2 r 10 U112 D 0191 TAME SELECT 017 0174
19. PCB AUDIO DETAIL A TYPICAL 4 8 PLACES i 25 TYPICAL 26 8 PLACES gt amp 19 21 24 18 TYPICAL 6 PLACES 19 Figure 8 Exploded View 200 DETAILA 26 878519 54460001 878320 51847011 878560 52264005 0086300 970011 1 50049003 51845038 51847003 450520 51856001 270229 57722000 450464 1 450463 1 53431002 PCB Display Receptacle crunp PCB Audio Screw 4 40 x 1 4 flathead Wireset Connector Housing 5 Pin Copper strip 343 x 005 Fish Paper Lock washer Screw 4 40 x 1 4 pan head Screw 2 56 x 1 8 flathead otandotf Screw plastite 2 28 Lug Connector antenna Sprocket Volume Control Knob Switch Button rectangular DETAIL Pak EA R3 RO d OG DO C me Oe Lh 53431005 878517 59908001 150024 3 878439 3 875430 878521 51845091 878662 31845093 51845055 878431 51845074 557000 500322 760386 DETAIL B Switch Button round Not Used Connector bracket Connector Switcheraft Telex label Front Panel Chassis Transmit Board screw 6 32 x 3 16 Receive Board Screw 6 32 x 3 8 4 40 x 3 16 pan head Cover Not Used screw 86 32 x 1 4 pan head Mut 86 32 hex Screw 46 32 x 3 8 hex head Insulator Pro impreg bo mms y x x CHAPTER 3 TRANSMIT RECEIVE amp AUDIO CIRCUIT BOARDS BTR 200
20. The version 3 and 4 schematics show these inputs as they are un modified that is connected to the right side of the resistors On versions 5 and above 0115 is replaced with Q112 0113 Q114 and 0115 and modifications are necessary Power Supply 2108 0114 form 10 volt regulated power supply On versions 1 and 2 2101 is used as the 5 volt reference while on later versions this comes from U117 U112 and are also supplied by 1117 m M lt Fvrr H ssssIsr GA C ALIGNMENT PROCEDURE Equipment Required Signal Generator Audio Generator Deviation Meter Audio Voltmeter Connect the audio generator to the AUX IN jack and set the output to 20 mV at 1 KHz Selectthe AUX pushbutton on the front panel Adjust VR601 located just under the YC push button on the front panel to maximum counterclockwise If the base is configured for an RTS intercom connect the load to the jack on the rear panel Connect the audio voltmeter to the AUX OUT jack on the rear panel Adjust VR101 for a minimum reading Disconnect generator and meter from the AUX Jacks and de select the AUX pushbutton on the front panel 8 Connect signal generator to the Receive Antenna jack Set the deviation to 3 KHz at 1 KHz Set the output to 1 mV Set the frequen cy to the channel 1 frequency listed in the chart of the receive board alignment Select t
21. 32134057 52154108 52154012 52154060 52154012 52154060 52154012 52154060 52154012 52154060 52154012 52154068 52154092 54045 162 54045169 52154048 52154012 52154026 52154996 52154012 52154036 52154028 52154054 52153043 32154036 32134060 32134041 52154036 52154031 52154024 52154018 52154002 52154012 32154020 52154036 52154031 52154012 52154988 52154080 52154000 52154078 52154068 57148067 57148060 57148013 3 47 1 2 3 4 5 6 5101 5102 5103 5104 5105 5109 510 111 112 Description Switches Switch push button Switch 2 position slide Switch push button Switch Dip 9 position Switch push button Switch momentary push button Switch 3 posilion slide Switch DPDT Transformer 57604001 700127 57604001 700128 1 57604001 57604002 700126 700991 Transformers Indicates the Version number in which that part is used VR6OI VR602 VR603 VR604 600 601 1 0602 LED603 LED604 1 80605 LED6006 LED607 LED608 LED609 PCB Display 878519 Description J601 J602 Cable Assemhly Cable Assembly Sprocket Piher Potentiometer 00K Piber Potentiometer 1009K Volumne Potentiometer Piber Potentiometer 100K PCB Display LED Red LED Green LED Green LED Green LED Green LED Yellow LED Yellow LED Red LED Green 640063 3 640063 3 450464 724719 724719 723087 724719 70716000 58713000 87 1
22. 48 PCB Display 378519 Parts Lists ee AO Figure tn Aa ww 10 11 12 13 15 16 IFA 17B 28 29 30 31 33 34 List of Illustrations Description Page Headset XLR Connector Wiring a a s eese nenne nenne snae ten 1 2 Front 200 2 2 1 1000060006 h aa aaa ad ee ute nna rran 1 3 Rear Panel B TR 200 aa 1 4 Location of Rev Level for Versions and 2 Audio Board 2 1 Location of Rev Level for Versions 3 thru 6 Audio Board 2 1 Location of Rev Level for Versions and 2 Receive Board 2 2 Location of Rev Level for Versions and 2 Transmit Board 2 3 Exploded View BTR 200 2 4 Transmit Board Component Layout Foil 3 4 Transmit Board Component Layout Component SIde 1 3 4 Schematic Diagram Transmit Board Version l 3 5 Schematic Diagram Transmit Board Version 3 6 Schematic Diagram Receive Board n neos 3 16 Receive Board Component
23. 6104 7 5048 j Example 0308 510 27 CS 4 22UF gt INTERCOM CMM ull 51041 828 d SELECT V X 10 I i qu 1228 rio 162 R103 RICA i 2004 5112 47 la FB 0103 109 2181 2172 R235 2130 ovr Hak 1 16 2K AUF D ros Rm C138 Rios amp 4 74 P caos RIOS bii mm gt OM ie nit ek 010 wor EXTERNAL 16 9 TIE tur HESS SPEAKER 8121 10 R152 2142 1 470UF 412145 0150 0801 0716 i ATOUF ae 6147 200 LPF 1 mos d TUF 1H E hi HEADSET 121 0109 R220 VOLUME 114148 5 1K gt r7 Cit REZA wor 13H c 8803 roma Lily HPSX704 56 MPS3704 2164 mite R117 n EN TOK I w um i i Lo Figure 30 Schematic Diagram Audio Board Version 4 3 42 Li 12 z 0163 17 PORTABLE 1 0155 y SELECT ADE P as a UDEA mu ni gt jour 5105 4 9K pS Mar p pe PORTABLE 1 MP S3702 10 2 010 011225 I Jj Pd PORTABLE 2 ge E 1 ul 12 0 SELECT BE p C14 pas gt HESIO 5100 4 7K 73 RISE 0113 gt iK wey 1829
24. Adjust VC301 for a peak indication adjust VR301 to just extinguish the number LED on the front panel 9 Adjust VC302 for a null indication 22 Set the signal generator to the channel 2 fre 10 Adjust VC303 for a peak indication 3 10 quency x 23 24 25 26 27 28 29 Adjust 310 311 312 T313 T314 for maximum DC voltage at pin 5 of U304 Set the signal generator output to 1 mV and adjust T315 for maximum audio at pin 7 of U305 Adjust VR304 for 140 mV of audio at pin 7 of 1305 Set the signal generator output to and adjust VR303 to just extinguish the number 2 LED on the front panel Set the signal generator to the channel 3 fre quency Adjust T316 T317 T318 T319 and T320 for maximum DC voltage at pin 5 of U306 Set the signal generator output to mV and adjust T321 for maximum audio at pin 7 of U307 30 Adjust VR306 for 140 mV of audio at pin 7 of 3 2 33 34 35 36 U307 Set the signal generator output to 1 uY and adjust VR305 to just extinguish the number 3 LED on the front panel Set the signal generator to the channel 4 fre quency Adjust 7322 T323 T324 T325 and T326 for maximum DC voltage at pin 5 of U309 Set thc signal generator output to 1 mV and adjust 1327 for maximum audio at pin 7 of U310 Adjust VR308 for 140 mV of audio at pin 7 of U310 Set the signal generator output to 1 WV and ad
25. BOARD CIRCUIT DESCRIPTION PCB 70714000 This unit is a four channel single conversion receiver consisting of one front end and four LF strips Signals entering the board procced through 3 tuned circuits Q301 and 3 more tuned circuits to the mixer MX301 is a doubly balanced diode mixer and receives 7 dBm from the oscillator 0302 a Colpitts oscillator with the collector tuned to the second harmonic Y301 operates on the fifth overtone with C319 and L308 acting as mode suppressor L310 is used to set the oscillator on frequency From the mixer the stgnal continues through a broadband filter to line driver Q303 VR309 is used to set the collector current to 20 mA 0303 drives the four LE strips beginning with crystal filters FL301 FL308 The four LF strips are the same cxcept for component values Also the 10 7 MHz LF substitutes a ceramic filter for two tuned circuits For the remainder of the description the parts in 10 7 MHz LE will be referred to The LE signal is amplified by 0304 and U301A and limited and detected by U301B U301B contains a quadrature detector which is tuned by T309 Squelch is of the amplitude type the D C voltage at pin 5 of U301 varying in proportion to the signal strength With no signal 1302 pin 1 is low and the audio outputis squelched When the recetved signal causes the voltage at pin 3 of U302 to exceed that of pin 2 of 0302 pin I goes high and the squelch opens VR301 sets the threshold at
26. E possu P328 c352 325 V3SOK 8328 i 320 220 Rad ra c io A DUE U328 C CN 16 MC3359 26 C335 Ter maw VR321 T E CY 74 653 N MPS3704 C316 jp T 1510 61 UF R314 2 2K 6312 RISI 470 5 189 1 MPSH10 4370 19 C384 R378 isk 20K csao USTIA R371 NESS32 2 2K 1567 C 4 PST 3 m ose Vsak gt R376 cnm 12 Ur 9 220K Kane FE371 R PER 1 Q371 00 1UF r t NHPS3704 NC3359 Nas N MPS3704 aie 1UF U37e D 1 MC3358 FREQUEN Xl 2 g 4 m 18 427 A 100 9420 CF420 42 UF cy omi 68K 206 208 MHz 14 7 pF 50 pF pF 33 pF A 1 21 88PF C434 R428 9428 1UF 13K 20K 6439 R429 q U42 A U421 B U421 A C435 18K 10K 18K L ESEN eee 1K C422 17 B 28421 gt C429 AO47UF C440 Q421 qwe 16 40 MPSI704 C433 a R42 gt 1UF 1905 19 we 1451 6477 108 UF R472 I 86K X 204 cana gt 8479 U471 8 U471 A AUF 220K NES532 848 NE5532 220K Figure 15 Schematic Diagram Receive Board Version 1 750309 PCB Assembly 878662 ewe ser
27. Layout Component Side Versions and 2 70714000 22 Schematic Diagram Receive d Version 2 750309 3 18 Receive Board Component Layout Component Side Version 1 3 19 Receive Board Component Layout Foil Side essen 3 18 Receive Board Component Layout Component Side Version 2 750309 3 19 schematic Diagram Receive Board Version 1 750309 3 20 Block Diagram Versions I and 2 eene eene ener nenne 3 31 Block Diagram Versions 3 thru 6 3 32 Audio Board Component Layout Component Side Versions land 2 3 33 Audio Board Component Layout Foil Sde aaa 2 24 schematic Diagram Audio Board Version 3 35 Schematic Diagram Audio Board Version 2 ees essence rennes 3 36 Details of Board Differences Between Versions and 2 2 3 37 Details of Board Difference in Versions 3 4 5 and 6 a nenne 3 38 Audio Board Component Layout Component Side Version 6 with Detailed Areas Showing Differences of Versions 3 4 5 and 6 3 39 Audio Board Component Layout Foil Side Version 6 a sU 3 40 schematic Diagram Audio Board Version 3 asr 3 441 Schematic Diagram Audio Board Version 4 3 42 Schematic Diagram Audi
28. R165 52154012 RIII 52154032 R 166 52154996 RLi2 52154036 R167 52154020 1137 52154028 R16813 52154016 R113 2154030 1684 6 52154032 R114 2154020 R169 52154036 115 52154988 R1701 52154035 R116 7 52154046 R170 52154016 11675 52154036 R170 9 52154036 R117 52154032 R171 52154072 52154028 R172 173 52154036 1182 52154030 R174 32154072 R119 52154048 R175 52154020 R120 52154945 R175 52154022 R121 52154036 2176 52154988 R122 52154042 p 1771 2 52154020 R123 52154052 2177736 52154040 R124 52154033 R178 52154988 R125 52154036 R179 52154012 R1257 52154022 R180 52154028 11253 52154041 Rig 52154091 R125 52154044 Rig1 Not Used An AA C PCB Audio Assembly 878520 Versions 1 thru 6 Continued All resistors in ohms 1 8 watt 5 unless noted Resistars amp Potentiometers Continued 1 1 4 watt 18K Not Used 3 6K 204 1 1 4 watt 6 8K Not Used 6 8K 68K 10K R192 R193 R194 R195 R196 R197 R198 R199 R200 R207 R208 R209 R210 R211 R212 R213 R214 R215 R216 R247 R218 R223 R236 7 Not Used n223 R2247 R2257 226 R2277 622835 R229 22307 R231 R2327 R233 223436 R235 R2362 5 R237 R239 Not Used R237 R23825 R2397 R240 R240 6 VR101 VR102 VR103 Not Used 2 5K variable 10K variable 100K speaker potentiometer 52154909 32154030 52154077 32154047 54042294 52154040 52154040 52154016 52154036 52154065
29. T504 501 and VC502 for maximum power Note If adjustments are sevetly out of alignment and no output can be obtained it may be necessary to first adjust T502 and T503 for maximum DC voltage at the emitter of Q502 Then adjust T504 for maxi mum DC voltage at the emitter of Q503 Now adjust VC501 and VC502 for maximum power 3 Adjust T501 for the correct frequency _Y501 Marking Frequency 154T570 154 570 1771500 177 800 4 Repeat Steps 2 and 3 as necessary 5 Deviation will be adjusted in the audio board alignment Voltage Tables Transmit Board 878521 3 Karri NS Pag DEVICE 2 PIN NUMBER 0503 EEES C E E B TAREA A 7 CD STD sasa gH gm m 3 3 T TES jai 9 amp 6 22 EN a HR 025 uu e e 502 y 55505 2020204 i e mS054 ie QUU 2 12 u C5 52 4 af 4 Er AE slo Hr me E 7 Figure 9 Transmit Board Component Layout Foil Side You 2512 C501 _ ii U502 C511 526 522 47512 O 1501 050 5302 R517 osos OF CSOs S 1503 5505 eS q ges C329 O Figure 10 Transmit Board Component Layout Component Side 3 4 R504 C507 R503 512 lU 4 7 0522 C526 R520 47 c
30. Transmit Board Version 2 No PCB500 PCB Transmit Assembly 878521 PCB Transmit Capacitors Part No 70724000 All capacitors in microfarads unless noted Ref No Description 501 502 504 505 C506 C507 C508 509 510 511 512 C513 C514 C515 C516 C516 C517 C518 C519 7 C519 520 2 C520 0531 0522 52312 5233 C524 C524 5242 C525 C526 C527 C528 C529 C529 C530 C530 Electrolytic 100 Eiectrolytic 1 Electrolytic 4 7 Ceramic 100 pF Electrolytic 1 Fitm poly Electrolytic 4 7 Electrolytic 10 Ceramic 01 Ceramic 100 pF Ceramic TC 47 pk Ceramic TC 68 pF Ceramic 22 pF Ceramic 27 pF Ceramic 01 Ceramic 1 5 pF Ceramic 30 pf Ceramic 39 Ceramic 75 pF Ceramic LOO pF Ceramic 100 pF Ceramic 201 Ceramic 2 pF Ceramic 18 pF Ceramic 27 Ceramic 24 pF Ceramic 33 pF Ceramic 001 Ceramic 100 pF Ceramic 3 3 pF Ceramic 100 pF Ceramic 47 pF Ceramic 68 pP Ceramic 15 pF Ceramic 20 51821524 51821106 51821109 35693019 51821106 52719007 31821109 52723008 52676107 35693019 52713002 52713003 35693011 35693012 52676107 35693047 35593046 35693014 35693061 35693019 33693019 5267616 35093008 35693010 35693012 35093060 35693013 52676101 35693019 35693002 35693019 35693015 35693017 35693009 35603048 T501 T501 T502 T503 Coil Coil Coil Coil Coil Air Wound Coil Air Wo
31. and 0110 This lights D609 and gates on the microphone audio Releas ing 110 turns off the microphone 3 27 AUDIO BOARD UII6A does not change state under these condi tions because C182 is discharged when the clock 15 pulsed If however 5110 is depressed twice in quick succession C182 will be charged for the second clock pulse and this will set UI16A Now the microphone is latched on via D109 and will remain on until 5110 is depressed once again resetting ULIGA Auxiliary Input Amplifier Audio from JIOT 1s attenuated and converted from balanced to single ended by U102A Q101 QIO2 and Q103 form a peak limit ing amplifier identical to that described for the microphone above 5101 not only enables the audio path for the auxiliary input but also lights D607 to half brilliance to indicate active auxiliary When peak limiting occurs shorts out R 120 and D607 is brought to full brilliance Intercom Driver UIO7A is configured as an AC current source whose output current equals the Input voltage at C125 divided by the value of RI58 Thus the voltage gain 15 dependent on the value of the load In this way many such intercom stations can be connected in parallel without each successive sta loading the line A single load resistor 15 usually located in the power supply for the wired intercom On versions 3 and later UIO7B is used to drive the lower end of TIOL This section 1s not a c
32. gt TELEX Service Manual PROFESSIONAL WIRELESS INTERCOM SYSTEM BTR 200 SERIES TELEX Table of Contents 3 Page Chapter 1 General SCHIP NON sch uu asha el Spee cationes BTR 200 IE N E LAM Li EE 1 1 Controls and 1 2 Front Pawlu u uuu A Vee hl A 1 5 Chapter 2 Identification of Circuit Board Revision Version L 2 1 det ica 2 2 Trone mt B Mem 2 3 Chapter 3 Transmit Receive amp Audio Circuit Boards BTR 200 Instrument Disassembly io land 3 1 Me AAA Sas 3 2 Circuit Description 3 2 Alignment Procedure ae c TENE 7 Voltage Tables Transmit Board 878521 3 3 PCB Transmit Assembly 87852 1 Parts List esee eee eene eene nennen nnne nnne 3 7 Receive odo uvis ov dp aba ee C ETT 3 9 ae Circuit Deserptrom TUD tt 3 9 Circuit Desenpion to B 730309 i u u 3 9 Adipgnment Procedure din nce ebd oU 3 10 Receive Board 7071000 uu 3 10 I quip nt ets A EM LAM E EE 3 10 Receive Board 750300 3 11 Eguipmient a 3 11 Voltage Tables Reccive Board 70714000 ed LA Voltage Tables Receive Board 750309
33. pin 2 and thus the squelch R320 provides hysteresis Q305 is used to drive the LED on the front panel From 0301 the audio ts amplified by U303A R389 R328 and C354 set the de emphasis at 115uS VR302 is used to com pensate for variations in detector output level U303B is a 3 pole Butterworth Iow pass filter with a cutoff frequency of 10 KHz 3 9 PCB 750309 This unitis a four channel dual conversion receiver consisting of one front end and four LE strips Signals entering the board proceed through 3 tuned circuits Q301 and three more tuned circuits to the mixer HY301 is a doubly balanced diode mixer and receives 7 dBm from the oscillator 302 is a Colpitts oscillator with the collector tuned to thc second harmonic on version 1 boards and the third harmonic on version 2 301 operates on the fifth overtone with C311 and L308 acting as mode sup pressor L307 is used to set the oscillator on fre quency From the mixer the signal continues through Q303 to filter drivers Q320 Q370 Q420 and Q470 On version boards the signal 15 rcsis tively coupled to the filters On version 2 boards it is inductively coupled The four LE strips are the same except for component values For the remainder of the description the parts in the 10 7 MHz LE will be referred to U320A mixes the incoming signal with a 10 245 MHz oscillator to produce the second LF of 455 KHz The other three oscillators operate at 455 KHz above their respective inp
34. 00 pk Ceramic Z5U 0047 Ceramic 120 Ceramic 250 1 Electrolytic 1 0 Mylar 015 Ceramic 30 1 Mylar 0022 Mylar 0056 Ceramic 330 pF Ceramic 751 001 Not Used 35693004 35693003 52007003 52007000 52007000 52007012 33693019 52076101 52007000 32007012 52007009 52007012 52076101 35693013 35693015 52676105 52007000 52007012 52676107 723023 102881301 52676107 35693022 35693016 35693017 33693023 52676113 35693019 52676108 35693020 52676113 52723025 52719058 52676113 32719053 32719068 35693624 52676101 52676107 35693022 35693049 35693017 35693023 52676113 35093019 52676105 35693020 32676113 52723025 52719058 52676113 32719053 52719068 35693024 52676101 C425 C427 C428 C429 C430 C431 C432 C433 C434 C435 C436 C437 C438 C439 C440 441 469 C470 C471 C472 47223 C473 C474 475 477 C478 C479 C480 C481 C482 C483 C484 C485 C486 C487 C488 C489 C490 Ceramic ZU 01 Ceramic 150 pP Ceramic 180 pF Ceramic 43 pF Ceramic 50 Ceramic 68 pl Ceramic 220 pF Ceramic 250 1 Ceramic 100 pP Ceramic 50 0047 Ceramic 120 pF Ceramic 250 1 Electrolytic 1 0 Mylar 915 Ceramic Z3U I Mylar 0022 M ytar 0056 Ceramic 330 pl Ceramic 2517 001 Not Esed Ceramic 2530 Ceramic 156 pr Ceramic 39 pF Ceramic 43 pF Ceramic 68 pF Ceramic 220 pF Ceramic ZU i Ceramic 100 pF Ceramic 2511 2047 Cera
35. 2 152 Vox L oTa 18 8 uni K m Pa a zu T AS VR RAUS 49 sal oc c Be mes t EE TUM iz D C R165 lt ae 2 mit I 19 x o 8126 Fa E SRA gt A e A I 2 art _ 8130 ar tee m r s Fipure 22 Audio Board Component Layout Foil Side Versions 1 and 2 PORTABLE 1 2155 SELECT 6171 MW c 7 Wr 3905 aque A190 E TUUM PE r PORTABLE 1 PORTABLE 2 SELECT 2174 R131 pe mn NESIS 5108 BAK 08 gt Rig R199 1006 100K PORTABLE 2 PORTABLE 3 SHIT SELECT TRAN 5175 CS mpm BOARD 100 5107 Bey PA pp 5200 REA 100K 4113 ku 01006 Rid R1B85 Lu BOARD 3 68 anand PORTABLE 4 i Rigs SELECT 0178 177 R133 3 Ur 5108 0102 A BUE 31 nim 240 Nd 1X 144148 un DAA 0132 KC dl gt NOTE COMPONENTS IN DASH gue PM mA CITY cc BORDER AREAS ARE F C154 aro n well THE DISPLAY BOARD 1414 LIK 2140 Ridi M nx 0122 2 p NESS32 GH
36. 2 52154036 724770 724774 724774 52228000 Ls m Ref PCB Receive Assembly 878662 Description Printed Cireuit Board Receive Capacitors Part 750309 All capacitors in microfarads unless noted C3011 30123 C302 C3027 C303 30323 C304 C305 C306 C3071 c307 C308 C3087 C309 C310 C3H C312 C313 C31325 C314 C316 C317 C318 C319 C320 C321 C322 C323 C324 C325 C327 C328 C329 C330 C331 C332 333 C334 C335 C336 C337 C338 C339 C340 C341 C360 C370 C371 C372 C373 C374 0375 0377 C378 C379 C380 C381 C382 C383 C384 C385 C386 C387 C388 C389 C390 C391 C419 Ceramic 5 6 pF Ceramic 4 7 pF Ceramic 82 pF Ceramic 5 pF Ceramic 5 pP Ceramic 33 pP Ceramic 100 pF Ceramic 2301 001 Ceramic 3 pP Ceramic 33 pr Ceramic 1 2 pF Ceramic 33 pF Ceramic Z5U 001 Ceramic 33 pF Ceramic 47 Ceramic 7 511 0047 Ceramic 5 pF Ceramic 33 pF Ceramic 731 01 Ceramic 100 pF Ceramic 001 Used Ceramic 230 01 Ceramic 180 pP Ceramic 56 pF Ceramic 98 pF Ceramic 220 pF Ceramic Z5U 1 Ceramic 100 pF Ceramic 2511 0047 Ceramic 120 pF Ceramic 50 i Electrolytic 1 0 Mylar 415 Ceramic 50 1 Mylar 0022 M ylar 0056 Ceramic 330 pF Ceramic Z5U 001 Not Used Ceramic 311 01 Ceramic 180 pF Ceramic 30 pF Ceramic 98 pF Ceramic 220 pF Ceramic 29 1 Ceramic 1
37. 2 32154036 4104 Connector 3 Pin XLR Female 59893001 R 12939 52154036 J105 Connector 3 Pin XLR Male 59892001 R130 1331 52154016 Jack speaker 1 4 phone 53326000 R130 133 Jack power 2 1 mm 59697001 57154044 P102 P103 Header 11 pin 670061 52154066 2114 Header 5 pin 52263005 R136 R137 52154072 R138 52154020 R139 R140 52154988 Transistors R142 52154028 R142 52154030 0101 Transistor 1177 54687003 Ri43 52154032 0102 Q103 Transistor MPS 3702 54713000 R 1441 52154046 0104 0105 Transistor 1177 54687003 R144 52154036 0106 Q107 Transistor MPS 3702 54713000 1451 52154028 2108 Transistor TIP 30 760384 R145 52154030 0109 Transistor MPS 3702 54713000 R146 52154032 0110 Transistor MPS 3704 54712000 Ria47 52154006 Q112 Q1 15 7 Not Used R148 R149 52154036 0112 011529 Transistor 2N4124 35573000 R150 R151 52154060 R152 52154049 Miscellaneous R153 32154035 F101 F se 710081 r154 4 52154034 FC101 FC102 Fuse Holder 710082 R 154 52154042 2154 52154038 resistors in ohms 1 8 watt 5 unless noted RIS 5 R 157 54046150 Resistors amp Potentiometers 158 6 52154072 R158 52154079 R1011 52154014 R159 54046150 1014 52154005 160 52154036 1102 52154052 p 16112 52154025 R103 5 52154014 R161 52154032 R103 52154005 R162 52154052 104 R 105 52154052 216223 52154037 R106 52154046 1624 6 52154046 R107 S2154084 R163 52154036 R108 52154036 2164 52154088 109 R110 52154972
38. 24 Tur a 1 A _ LL iul uL cL EN LL cl lI 22200222 2x RIGS 15k 412 Casi cios 0308 bans dena 7 305 owe T Kasus CAU 194545 n 1 2 IPE L UF clue CIMA Po lee 120 cim 7 4 ok C384 IF t 4 V 1 us d 7 0414 DM 2359 Toe rate p OLIM T38 Pl aco NT EE U30688 o g U307 8 1 p uel NEGI 3 ol U t gt L pn Ag 7 Tens 220b Mal Mn 3 1318 p ki 2410 ee ates coso 8 Path 8352 UF if 220 ki F IF taba sso page 20417 AAA 100 10H T 10 LL R307 cate __ T RIAI IDK ET 47K Re E TOL 825 wd Tk B AA n 10K L 2309 MPS3704 SK UJOG A cus 1 lur R373 C444 eaj T426 L 016 044 la teas our MPS3640 6453 114140 _ T 322 MU Dur _ 19 gt 12438 525 cae il un kun 445 l AT RIGA laa 111 1 H _ TIE _ U3OEH a ski UM D T Tema a Py gpl ness L SI T T f cass L C453 I al m 5 E T3224 Tar E 1323
39. 301 y301 Y301 FL302 71 303 FIL 30322 1304 FL30422 21 305 305 R302 R303 R304 R305 R306 R307 R308 R3082 R300 R3 1 R312 R313 R314 R315 R316 R317 R318 R319 R320 R321 R322 R323 R324 R325 R327 R328 R329 R331 R332 R333 R334 R335 R336 R337 R338 R339 R340 R34I R342 R343 R345 R346 R347 R349 R350 PCB Receive Assembly 878522 Continued Crystal Filter Insulator Mixer ASK 1 Crystal Receive 171 905 MHz Crystal Receive 207 800 MHz Crystal Receive 213 800 MHz Filter 10 7 Crystal Filter 11 56 MHz Crystal Filter 11 075 MHz Crystal Filter 11 56 MHz Crystal Filter 11 075 MHz Crystal Filter 1236 MHz Crystal Filter 11 7 Miz Crystal Filter 12 36 MHz Crystal Filter 11 7 MHz Crystal Filter 13 1 MHz Crystal Filter 12 5 MHz Crystal Filter 13 1 MHz Crystal Filter 2 5 MHz Crystal Filter SFE 10 7 MHz J red AH resistors in ohms 1 8 Watt 5 unless noted Resistors 1 5 16K 220 330 1 5K 10M 1 4 watt 10K 22K 00K 220K 10K 68K 10K 4 7K 1 5K 16K 220 1 5 10M 1 4 watt OK 22K 100K 220K LOK 68K 10K 4 7K 450471 760382 780089 1 780089 2 180089 3 780087 0 780087 4 780087 7 780087 4 780087 7 78008 7 5 780087 2 780087 5 T50087 2 780087 6 780087 3 T7T80087 6 780087 3 32990001 52154060 32154036 5215408 52154108 52154060 52154084 52154068 52154078 521540
40. 36 52154100 52154075 32154044 52154056 52154031 52154076 52154072 32134056 52154185 52154036 52154028 52154012 52154004 52154036 52154016 52154036 52154044 52154056 52154031 52154076 52154056 52154185 52154036 52154028 52154012 52154004 32154036 52154016 52154036 52154044 R351 R352 R353 R354 R355 R356 R357 R358 R359 R366 R361 R363 R364 R365 R367 R366 R369 R370 R371 R372 R373 R374 R375 R376 R377 R378 R379 R381 R382 R383 R385 R386 R387 R390 P301 P307 p308 P311 P312 P313 1301 T303 T304 T305 1306 1307 1308 1324 1301 2304 F169 505 174 905 LSK 16K _ 220 1 5K 10M 1 4 wait 22K 100K 220K 10K 68K 4 7K 1 5K 16K 220 L5K 10M I 4 watt 10K 22K 100K 220K 10K 68K 22K Connectors Not Used 3 Pin Header Not Used 3 Pin Header Transformers Transformer Transformer Not Used Transformer Diodes Diode 1N4148 c i a w v AA o_eme u m a 3 52154056 52154031 52154076 52154056 52154185 52154036 52154028 52154012 52154004 52154036 52154016 52154036 52154044 32154056 52154031 52154076 52154056 52154185 52154036 52154028 52154012 52154004 52154036 52154010 52154036 5215405
41. 4000 58714000 58714000 58714000 58676000 58676000 58713000 58714000 DISPLAY BOARD LED 09 A P LED604 _LED606 16606 AW poo 050 j 960 UT EST ad y 1 u A ae 2 i WA gt gt i T 4 i AE 3 4U SEES LT 7 E gt il 425 POPES Faa fe IH Figure 33 Display Board Component Layout Foil Side A 4601 LED606 LED607 LED60S 1 0604 _LED603 LED602 602 LEDGOB JO YA501 VR603 VAGO4 Figure 34 Display Board Component Layout Component View 3 48 TELEX PN 802482 24 MAR 1993 Printed in U S A
42. 4056 52154060 52154000 52134004 mw xo ___ 2 _ PCB Receive Assembly 878662 Continued Resistors Continued R327 52154012 R427 52154012 R328 52154033 R428 57154033 R329 R330 52154004 R429 R430 52154004 R331 52154084 R43 52154084 R332 R334 52154036 R432 R434 52154039 R355 R369 Not Used R435 R469 Not Used R370 52154058 R470 52154058 R37 52154076 R47 52154076 R372 52154016 R472 52154016 R373 52154056 R473 52154056 R374 52154060 R474 52154060 R375 52154000 R474 52154000 R376 52154004 52154004 R377 52154012 52154012 R378 52154033 52154033 R379 R380 52154004 R479 R450 52154004 R381 52154084 R481 52154084 R382 R384 52154036 R482 R484 52154036 R385 R419 Not Used Connectors R420 52154058 R421 52154076 3 Pin Header 670062 R422 52154016 3 Pin Header 670062 R423 52154056 3 Pin Header 670062 R424 52154060 3 Pin Header 670062 R425 52154000 3 Pin Header 670062 R426 52154004 3 26 C AUDIO BOARD CIRCUIT DESCRIPTION The audio board receives signals from the receive board the headset microphone intercom input and auxiliary input and outputs to the transmit board the headset an external speaker intercom out and auxiliary out see block diagram Receive Expanders Audio from the receive board 1s routed through 1108 1109 J110 and J111 to U112 and U113 The gain of these devices is controlled by the audio level at the rectifier pins 4 and 16
43. 471 0372 0421 0422 x Q471 Q472 0322 0372 079 o NOSIGNAL 0422 0472 0321 0371 867 934 94 UNSQUELCED L Quem ju 3 15 C348 j _ _ _ _ _ _ _ ___ u AAG E119 1 5K 1 5 TIEF 2327 au cmo cao NOAH TEAS mur 104130 20 TETT Lpy I SFEIQ J _ ss eme ros Lea r al C __ 9328 1305 om Buc dur Re mu wm JJ A 5 E zB x Sener POPE Ea 88 HE qum cs elem Ier 3 HOPF F i T P108 exu E _ _ R328 pared Aur C a ease Bak e345 323 R25 160253 lt F325 c101 1 oye E WK Lu po Lt E R3Bi wh r Ig o O cl _ S R329 220 TH LM 20 Die 108 i n 305 308 i 0334 2 2365 C364 c365 c366 C367 c373 caso MPSYTDA 20 wow 123 _11 56MHZ 0010 39 1 50 470 39PF ee T Y 205 214 MHZ MHZ 17 07 5h 6 2 56PF 2 75PF 1 1FF 4 PF 1 1PF S6PF hBOPF 43PF Y PF S6PF 4 d Lo o a _ 2 4 FREQUENCY 16901 163027 30510901 315 0315 508 ROB ri01 _ _ pe __ A LL
44. 900 6 ps vR304 E SO OR3486 9 C388 35 VR303 S C o O 2 VR3O1 i o R339 4 h 322 O x 07675 a 2 2 Q307 l 0305 Figure 14 Receive Board Component Layout Component Side Versions 1 and 2 70714000 SR SER R350 M FL308 2 EER ITA 16 999 ese E 953706 3539 PUE 3520 Y 0999 0 47 C393 x R3510 47 4 ime ds NET O o O EP 0408 5278 9 C410 o rr 85055 908 4364 L 4044 E lt oo 1501 R3579 Bp 3420 C3810R3190 R3240 C77 0 5750 52 6 R3780 0455 983550 EET HD O R338 9 OR341O0 O R320 9 9085259 Q R374 0 083770 356 0 OR3590 38492 OR3430 C352e Cp 9832560 244849 0R3790 54 49 4164 gt R3619 R382 R363 R364 ide gt 90 5880 4189 R387 95 OY loj 9j foj 0 452 nt OR3669 o C421 O O eT C196 5620 R365 oc aT anrr x es lt lt ee m _ C327 108 AUF R322 C334 R328 VARIZ 13K 20K gt R320 U321 B U321 P391 AUF 220K gt 6 25552 8332 R333 1534 NESS32 19K 10K 10 c337 L o33e L 1
45. 92 S112 A cast Yo ik oe er meros Y Yan demo NOTE COMPONENTS IN DASH 211 STUF 5600 1 20 10 5532 9140 OUTPUT j 150K AIF 113 R123 2 2 gt i HEADSET HIG IN 5102 ETE n234 E 1 10K MES S UR 03 BORDER AREAS ARE LOCATED ON gt AE THE DISPLAY BOARD C127 8135 01259 580 150 2134 4 1 ON 8 A 3N IN4140 MPS3792 180K l T ar 8133 t cii C210 a 6178 I ATH iw l Vi 1 C120 I L Li C205 AUX SELECT Example i cio e nix R21 AUX IN 20K HOLS 2 Tur R218 3112 98 AT OUT IH FB J107 e 2179 T o mb LI pepe 57M 1 97 I i 0104 124004 0407 t M358 dons EXTERNAL 1 0K je SPEAKER 68 t mii 2141 i amp TOUF ACTAS e cis l yo ATOUF 2 Power m luto mal jour i Rta pid 2314 y 6138 5 178 ure I 16 012 FADSET wow T 1 vaso LARP MA ES 7 HEADSET 7 150 R179 5217 225 ant el 4414 4 wur ATOE ass Sur I 2 Figure 42 Schematic Diagram Audio Board Version 6 3 44 Ref No PCB 100 200 C101 C102 C104 C105 C105 C107 C108 C109 12 Cil4 CLES
46. Ceramic O1 Ceramic 39 pr Ceramic 43 pi Ceramic 270 pF Ceramic 330 pF Ceramic 62 pF Ceramic 68 pl Ceramic 43 pP Ceramic 50 pF Ceramic 82 pl Ceramic 30 pF Ceramic 33 pF Ceramic 82 pF Ceramic 39 pF Ceramic 43 pF 2431 C432 Ceramic 270 pF 43223 Ceramic 330 C433 C436 Ceramic 01 C437 Ceramic 390 pF C437 Ceramic 470 pF C438 Ceramic 18 pF C438 Ceramic 20 pf C439 Ceramic 18 pF C439 Ceramic 20 pf C440 Ceramic 270 pF 441 442 Ceramic 1 Ceramic 2 2 pF Ceramic 30 pF Ceramic 33 pF Ceramic 01 Ceramic 1 Ceramic 100 pl Ceramic 01 Electolytic 10 Ceramic 1500 pF Electrolytic 1 Poly Film 0022 Poly Film 0056 Ceramic 330 pF VC301 VC307 Capacitor Variable 35603048 35693000 35693048 35693060 35693024 35693076 52676107 35693000 35093078 35693014 52676107 52676113 35693019 52676107 52723008 35693032 51821106 52719053 52719068 35693024 52676107 35693014 35693070 35693076 35693024 35093071 35693017 35693070 35693049 724711 35693046 35693013 724711 35693014 35693070 35693076 35693024 52676107 35693025 35603026 25693010 35693038 35693010 35693038 35693076 52670107 35693000 35693046 35693013 52676107 52076113 35093019 52676107 52723008 35693032 51821106 52719053 52719068 35093024 723086 4 Intergrated Circu
47. Coil 2 2 CT 10 mm Inductor 56 pH Inductor 10 uH Coil 2 1 4T 1 4 Tap 10 mm Not Used Inductor 10 pH Inductor 3 95 Coil 455 kHz discriminator Coil IF 10 7 MHz Not Used Inductor 10 WH Inductor 3 95 Coil 455 kHz discriminator Coil IF 10 7 MHz Not Used Inductor IO Inductor 3 95 Coil 455 kHz discriminator Coil IF 10 7 Not Used Inductor 10 Inductor 3 95 Coil 455 kHz discriminator Coil IF 10 7 MHz Ferrite Bead Ferrite Bead Ferrite Bead GAASTET NE 25139 Transilor 5901 JFET Transistor 10 Transistor MPS3704 Transistor MPSH10 Transistor MPS3704 Transistor MPSHIO Transistor MPS3704 Transistor MPSH10 Transistor MPS3704 Part No Potentiometers 57148071 57148072 57148071 57148072 57148071 57148072 57148071 57148072 Coils and Chokes 724778 724756 724775 724765 723403 3 723403 2 723403 1 35689047 35689041 724766 35689020 3568901 724765 35689011 724774 52982000 33029000 35689011 724774 52082000 53029000 35689011 724774 52982000 53029000 35689011 724774 52982000 53023000 56632007 56632007 56632007 760392 760376 54722000 54736000 54712000 54736000 54712000 54736000 54712000 54736000 54712000 3 25 Ref No CF320 CF321 CF322 CF3701 CF37022 CF371 CF3712 CF372 C420 CP420 21 cr4214 8422 CF4701 CF4707 CP471 CR47 12 CP472
48. INSTRUMENT DISASSEMBLY 1 Remove 6 each 6 pan head phillips and 7 each 14 head phillips screws and remove cover Refer to Figure 8 Unsolder coax cables from transmit and receive boards Unsolder 3 copper straps from receive board if present Remove transmit and receive boards Early versions are equipped with snap on nylon stan doffs and later versions are held with 4 head phillips screws Remove ring nuts from the two RF connectors Remove the hex head nylon screw and nut holding Q108 to the chassis Remove 8 each 4 flat head phillips screws holding the four XLR connector housings to the chassis On some early versions the upper PEM nuts will be replaced with nuts and Iock washers Using an XLR tool or small flat bladed screwdriver unlock the XLR housings by turn ing the locking screw counterclockwise Then remove the XLR housings by pulling them to the rear 3 1 12 13 15 Unplug the cable harness at P114 and the two ribbon cables at P102 and P103 Remove 10 each 6 pan head phillips screws holding the circuit board to the chassis Slide the circuit board forward and lift up and out from the rear Remove 8 cach 6 pan head phillips screws holding front panel to chassis Remove 2 each 4 pan head phillips screws holding headset connector bracket to chassis and remove front panel Remove 7 each phillips screws holding front circuit board to front pane and rem
49. OES NOT HAVE THE SWITCH BOARD AUDIO BOARD RATHER THAN ON THE SWITCH BOARD Detail A NOTE VERSION 1 DOES NOT HAVE THE ADDED CAPACITOR C203 LOCATED NEXT TO THE TRANSFORMER Figure 25 Details of Board Differences Between Versions 1 and 2 3 37 S H m Um x J eS m b m C11 69 009000000 8000050600000 h cC Detail A C148 C146 Detail B Figure 26 j O NOTE THIS AREA OF THE BOARD WILL LOOK LIKE THIS ON VERSION 3 AND 4 BOARD ONLY VERSIONS 5 AND 6 WILL REFLECT WHAT IS SHOWN ON PIGURE 27 NOTE THIS AREA OF THE BOARD WILL LOOK LIKE THIS ON VERSIONS 3 4 AND 5 BOARD ONLY VERSIONS 6 WILL REFLECT WHAT IS SHOWN ON FIGURE 27 Details of Board Difference in Versions 3 4 5 and 6 3 38 4113 3 1165 O 2150 CY 164 2 ct a SEE NLIS FIGURE 26 e DETAIL B E 6156 un 1 pisi 27 185 1194 mes e m 5 Rt 1 C188 O 195 m 1 5111 T 5 5 de x Ol R210 114 4 6158 Ri Ong ms owe 8 I ee 61 R143 Lla TO R142 cio Cit ES ux 7 5 R145 212 i o 0113 0123 io 2 85 a O RI
50. P AS ac Op Ea gg ais J l ZA dures o uits one ies gt woz R201 el J118 Jii ezei 21 Kaza c131 Rt 114 hy R164 SEE A aie 1 FIGURE 26 JE 802 dos 5 ciH DETAIL A 1 6127 R127 nt28 ci 8119 8112 PCIA O 1 5194 C cT4a 31 21 Are r m ATS 2 OO C in 5101 s105 106 EN 1 HF i Figure 27 Audio Board Component Layout Component Side Version 6 with Detailed Areas Showing Differences of Versions 3 39 3 d 5 and 6 rin JEN 8 R221 ca C 6111 R219 a ress R135 quia J112 mili 2 P ujia m m 2153 Des 182 R212 E C195 p226 18 y c3 C197 5118 SILKSCREEN REV G a s ri m ar m _ s _ _ AA A E o ZR ae T DEI da sor a 4 ia aa pA s Do r om Temm P PEN I ae pet fr Ao laine SU ERS E 1 BEEN 24 OEA 27 1 Fa CARE OS asas Y 08 i gt GN ME R o e ut _ x SS am PEE Vom MB UM un XE 4 1 x
51. SET CONNECTOR AUXILIARY LEVEL CONTROL AUXILIARY ENABLE SWITCH LOCAL MIC GAIN CONTROL INTERCOM LEVEL CONTROL LOCAL PUSH TO TALK INDICATOR INTERCOM ENABLE SWITCH MIC ON PUSH TO TALK LOCK TO TALK SWITCH Figure 2 Front Panel BTR200 27160 002 AUXILIARY OUTPUT CONNECTOR RECEIVE ANTENNA CONNECTOR AUXILIARY INPUT CONNECTOR INTERCOM CONNECTORS TELEX COMMUNICATIONS INC Receive Antenna Auxiliary Intercom FCC 1 0 BSDRTR200 MAGE IN U S A Audio Input Power Transmit Gain d prd Headset M c un LEE 2 AN Eit Cent OH Remate Spea ker 4007 ov TRANSMITTER SWITCH POWER JACK TRANSMIT ANTENNA HEADSET MiC SELECT SWITCH SPEAKER GAIN CONTROL CONNECTOR SPEAKER LOCAL MONITOR 8 N MIN Figure 3 Rear Panel 200 Ext Intercom Switch Level Control and In dicator This switch cnables the wired intercom interface when IN and disables it when OUT For RTS intercoms the IN position is channel A and the OUT position is channel A screwdriver adjustable control 18 provided to control the input level of the wired intercom Auxiliary Audio Enable Switch Level Control and Indicator The switch enables and disables the Auxiliary interface when IN and OUT respec tively The function of the level control here is the same as that described for the intercom REAR PANEL Refer to Figure 3 Transmit Antenna Connector Connect 5 8 wave antenna supp
52. T SELECT pias 1OUF 0172 RIJ 10H d HESTS 5105 47K ne Ks Soy mel gt 171 0150 TT A b R198 190 ABD gt THK PORTABLE V RRA 56 2184 iZ Sea Ay MPS3702 1 4193 E in af d AUX OUT PORTABLE 2 SELECT LE n me GUD aos 017 nun RX Qu gt gt Perl iQyrF 42K gt X30 REMOTE 547 4108 s 5 copa e 1 THE 1 PORTABLE 2 Y 2160 RIES esas j mu C157 San AN gt HESTS lD oe RG E l XE a T SELECT Mur HES7S 0175 176 R132 6 2K 18 MESSI TRANSMIT gt four 51307 4 7K Wipe C195 C187 gt de iD Teeter TD 0114 gt L 4 E s 1 Ww 100 100 AM SUF 1DU 0189 PORTABLE 3 T _ Y 113 I 1 E uie RECEIVE 9785 T NES 5 3 8K BOARD d 0182 kala CT 8128 133 1 m 10UF Your 4 22 RZU4 TERTON M MP5S320 ue ITERCOM RIAS gt 66 1205 a 205 K GAIN 100 OVERLOAD cono b 100 gt 1008 Dr QJ INDIATOR Q Ried PM PORTABLE 4 5 2240 TUE F NF 194145 aoe x 470 gt m gt HE5532 mes 1 108 0101 14 Balance Pew 154148 1 s lt onm E 102
53. V 1 100K y PORTABLE 2 E 2 U112 1 GIEF E BE575 1 mm no RIOS PSU gt lt R210 I li dr C185 G184 4 ie 1 i 1 PORTABLE 3 ciat of 10 pK SELECT Ld Tour RESIS C173 176 mia TRANSMIT 0114 Pa gt T ue 5107 R201 gt gt BOARD 1117 MES 1K YN R20 RZ Z cil N W le 10065 100K 4113 PORTABLE 3 uL ZE j fag R204 0115 m CIE 422 1401 Pid 1122 RIJ LEVEL C124 piss 50K THE DISPLAY BOARD 2127 0125 1002 294 Sio T1 1 amp 104 2 510474 2428 AUF 126 D gt 103 eZ LF HERG SELECT ciel RIOJ 105 Ecur DOR aK 2106 AUF 4 7 RIGA C143 108 RIS 0142 1 1 00 TK LM2695 C148 4 nina 47008 HEADSET SPEAKER VOLUME 0148 140 r UT 1913825 R178 dur gt ju U119 B 5903 5532 100K gt I ier R ped 100K 5138 mien I Figure 31 Schematic Diagram Audio Board Version 5 3 43 NOTE COMPONENTS IN DASH BORDER AREAS ARE LOCATED ON m ee ee ee PORTABLE 1 G159
54. ___ 12 189 172 MHZ 5 6PF QPF 4 7PF on ex 470 _ T Aaa T l ran 15K lt 206 214 WHZ 4 zer soar 33PF 33FF 53PF12 10H I RID 216 caos C381 FRIOS G3 418 R336 N 7 _ i om IH gms 1314 1 L _ 1 cody uk UC pt gt P Mna LIU 5 4 RM R34 1310 r383 mt i NERIS 328 8 o A NESS M LOK n VISO me 71 il HEGIA MAAA AW P NESE cae cedew L 3 Mcd SRI rr T WI T T Pr 1312 gt c 2 6320 cya d n _0058UF aan PIB ne 1 I Tur mur i feas ta EN t IE 7 T 1 C377 241 R344 2383 R3 43 i H eur pe 1 10 ipur gt 10 _ ___ Loo n aan 300 2 Faa 1 1 VI 47k TOR QO Sue vw 10K FL305 uius FREUE j wi 10K FREQUENCY FL506 _ 0392 393 63840395 0398 C397 407 0408 2 169 172 MHZ 12 3607 43 330FF 36 E ezar 205 214 MHZ 11 72 lares 39DBF 75PF 62FF oer xoPr ji aPr a7Pr S90PF 470PF
55. a ox x CJ ME JR lis an Souls L ANE i LUOTO O g 8 vo WA m f i i vu PM y HI wl 8 7 etn Yo His ja NY Nu ed E e I r n 8 A d TUE PAX 1472 Na 2 y V SX pn LAA 2384 M 3 Va ee GP 3 8 ml ITA 152222 Q371 Caza A 2435 i 110434 8 AA wer HOA C355 E 10 A C344 1322 e j vot UN y I E 1 me e 1 1 308 4 gt 5 6315 TP C3067 Figure 16 Receive Board Component Layout Component Side 0 Q L304 d gt gt C305 L303 lt gt 1 302 VC303 annali Q C303 L301 C301 3 19 Version 1 750309 Figure 17A Receive Board Component Layout Foil Side 1306 HYa01 O 120122 26314 1310 1313 Cc lt gt Lor R313 R321 o 8940 C338 lt 02539 FB321 Q320 L T gt y 94707 1 R00 D Razo n c D 80 0 C439 cass 3 CF420 50 a relin 00 128 pt 59 2 0 oo C433 3 e o 2t Di c R42 C385 Lao 312 9302 TT 938815816 R429 Jur 1470 i MX Y470 433 DT o C Q371 C435 P420 Figure 17B Receive Board Component La
56. aer de ooiur 4 1504 100PE 1501 C527 501 3 3PR 502 503 C519 R513 6525 R517 C530 CY Naso1 1503 VK N aso 8 2K N TT C529 csos i C514 2N5770 C520 2 5770 y Y MPS901 47K lt R510 47PF R51B 47UE 0510 SR506 C dl 470 PEER DE 47K MV2108 ie R511 5 C521 T R519 C528 5K R507 820 100 1 56 100PF C513 Y 100 WC502 Y MV2108 1501 FREQUENCY DEPENDENT COMPONENTS TABLE FREQUENCY C516 C519 523 0524 529 C530 1501 154 570 MHZ 27PF 39PF 100PF 18 33PF 6 20PF 000 177 800 MHZ 75 12PF 27PF 47PF 15PF 002 185 730 MHZ 22PF 3OPF 75PF 12PF 24PF 47PF 15PF 002 L Figure 11 Schematic Diagram Transmit Board Version 1 3 5 R502 R501 SOK SOK 512 R504 C507 10K 1UF 501 504 37 wampu U502 78105 R512 47 R520 6511 0512 0526 10UF TUE T502 a 100PF _ 1501 1 C518 7 1 5PF gt C527 VC501 S SPF Y501 R517 530 Cy N a501 1503 9 21 C509 C514 2N5770 MPS901 m 47PF C510 gt R506 4 470 4 7UF lt 47K 105 R519 _ C528 VR501 68PF as 820 56 6513 LRN 100PF f 100PF 183 730 MHZ 22PF Figure 12 Schematic Diagram
57. c 10 Electrolytic 2200 35W V Electrolytic 1 Electrolytic 1 Ceramic 01 Electrolytic 1 Electrolytic 10 Ceramic 01 Poly Film 018 Not Used Not Used Electrolytic 4 7 Not Used Ceramic 001 Not Used Ceramic 1 Not Used Ceramic 1 Not Used Poly film 015 Poly film 0015 Ceramic 560 pF Ceramic 820 pP Electrolytic 10 Electrolytic 100 50v Electrolytic 100 Electrolytic 100 50v Blectrolytic 1 0 52723008 35693019 52723025 52723004 52723025 35693019 52723025 52723004 52723025 52123008 51821232 51821065 51821106 52676107 51821106 52723008 52676107 52719183 51821108 52674101 52676113 52676113 52719008 52719052 33693027 35693029 32723008 51821115 51821524 51821115 52723023 52676107 35693007 C210 C211 Ceramic 01 C212 C213 9 Ceramic 10 pF 134 Electrolytic 51821065 13512 C1357 C136 C137 C138 C139 C140 141 C142 C143 C150 CI51 CI52 CI53 C154 CI55 C156 C157 C158 Ceramic 01 Ceramic 10 pF Ceramic 1 Ceramic 220 pF Electrolytic I Ceramic 220 pF Electrolytic 4 7 Electrolytic 470 Electrolytic 220 Not Used Ceramic 1 Hiectrolytic 100 Not Used Electrolytic 1 Ceramic 1 Ceramic 330 pF Electrolytic 10 Electrolytic 22 63 WY Electrolytic 10 Electrolytic 1 Ceramic 100 pF Electrolytic 10 Electrolytic 4 7 Electrolytic 470 Ceramic 001 32676107
58. di erm TS E eni a A 996 a V j AIST S Y Ear feo Li E af 47 20 00 tg hd EB Sp AB GU Taos oe Y BAY TH ew A oct At 126 i Y lg 5 Dc i 3 27 n a PIGS uis 3 ifs E p te pr la a E m dU i E ri i AR Sagas Apes E La Fs MAD z 211 AA Y AS CIN 208 6 191 388 to iy y Es 8212 2 P Xo D ud 4 a 9164 x FE ere CE 22 11 1 19 s AN j 2 qo Sk Ae Y j d gqE Y iii o i d iy u qu iro am Haa WI relie ris 2119 MEE 1 UM s 9180 uU Acad Ww ul P eA mide A Hi 2 Te ap ARA U113 52 une Dico 7 195 jo ED del pz Ya 1 UR dos C183 i Ayn H 1 i il 1 5 E Fi R222 og T Gy i E E j 8 y g NEM CHER 0i ate eli n xxn di TI ENIM ud Lpi 8201 oj Ce UE Vin Y fei 1 a il D308 23 1 og I 16 215 il a gl ayy GU v 7
59. distortion Version 2 Adjusut L421 L422 and L423 for minimum distortion Adjust VR420 for 140 mV of audio set the signal generator output to 1 uV Adjust VR421 fully clockwise then turn it counterclockwise until the number 3 LED on the front panel just comes on Set the signal generator to the channel fre quency and increase the output to mV Move the audio hook up to U321 pin 1 Adjust L322 for maximum audio Version 1 Adjust L321 and L322 for minimum distortion Version 2 Adjust L321 L322 and L323 for minimum distortion Adjust VR320 for 140 mV of audio Set the signal generator output to 20 Adjust VR321 fully clockwise then turn it 2 22 23 24A 248 25 26 27 28 29 30 318 32 33 34 counterclockwise until the number the front panel just comes on Set signal generator to the channel 2 fre quency and increase the output to m V Move audio hook up to 0371 pin 1 Adjust 1372 for maximum audio Version 1 Adjust L371 L372 for minimum distortion Version 2 Adjust L371 L372 and L373 for minimum distortion Adjust VR370 for 140 mV of audio Set the signal generator output to UV Adjust VR371 fully clockwise then turn It counterclockwise until the number 2 LED on the front panel just comes on set the signal generator to the channel 4 fre quency and increa
60. eramic 01 ss 39523 Ceramic 62 pF 35693071 er Carme C396 82 pF 724771 pate C336 Not Used C396 Ceramic I pF 35693054 C337 C340 Ceramic Ol 52676107 C397 Ceramic 36 pF 35693078 C341 Ceramic 560 pH C397 Ceramic 39 pF 35693014 C344 Ceramic 470 pF 35693026 Ceramic I pF 35693054 C345 C346 Ceramic 01 52676107 Ceramic 43 pF 35693070 C347 Ceramic 2 2 pF 35693000 47 pF 45693015 alk p p Ceramic 330 pF 35693024 x 350 5 2676113 Ceramic 390 pl 35693025 E TAR C401 404 Ceramic 01 52676107 22 Ceramic 100 C405 Ceramic 390 pF 35693025 Ee 5 5 cans Ceramic 470 pF 35693026 7354 Ceramic 1500 pF 35603032 C355 Electrolytic 1 51821106 C356 Poly Film 0022 52719053 878522 or ropa one sous ceramic 330 pP C359 Ceramic 01 52676107 169 505 171 905 MHz C360 Ceramic 50 pF 35693049 206 000 207 800 MHz x 5 c t 3 E amp E 8 e BH PCB Receive Assembly 878522 Continued Ceramic 20 pl Ceramic 24 pF Ceramic 20 pF Ceramic 24 pF Ceramic 330 pF Ceramic 270 pl Ceramic 01 Ceramic 2 2 pF Ceramic 36 Ceramic 39 Ceramic 01 Ceramic 1 Ceramic 100 pF Ceramic 01 Electolytic 10 Ceramic 1500 pP Electrolytic 1 P oly Film 0022 Poly Film 0056 Ceramic 330 pF
61. he channel 1 pushbutton on the front panel 10 Connect the deviation meter to the ANT TRANS Jack Connect the andio voltmeter to U106 pin 7 12A On version 1 and 2 audio boards adjust VR 102 12B 12C 13 for 300 mV of audio On version 3 and later audio boards with ver sion transmit boards adjust VR102 for volt of audio On version 3 and later audio boards with ver sion 2 transmit boards first move the audio voltmeter to 0501 pin 16 on the transmit board Then adjust VR102 for 140 mV of audio Adjust VR501 for 4 2 KHz deviation 3 29 3 30 Blank oe RECEIVER 1 RECEIVER 2 EOENER 3 m RECEMER 4 DYNAMIC ELECTRET HEADSET MICROPHONE _ AUX IN 3 31 HIGH LOW MIC GAIN f gt AUX GAIN Figure 19 Block Diagram Versions 1 and 2 INTERCOM GAIN ON VERSION 2 ONLY gt AUX OUT INTERCOM SPEAKER 69 TRANSMIT OUT 1 AUX OUT TRANSMIT OUT RECEIVER 2 EXPANDER INTERCOM GAIN HIGH LOW e RECEIVER 3 MEXPANDER ex a gt F RECEIVER 4 pd A MIC GAIN INTERCOM QUU DYNAMIC ELECTRET Wa gt HEADSET HEADSET b MICROPHONE gt AUX GAIN 7 SPEAKER AUX IN gt gt Figure 20 Block Diagram Versions 3 thru 6 144 145 0 U105 R181 ntaa 20
62. its IC NE614 160375 IC LM393 53284000 IC 5532 53295001 NEG6 14 760375 IC 5532 53295001 IC NE614 760375 IC NE 5532AN 53295001 IC LM393 53284000 NE614 760375 IC 5532 53295001 57148068 5K Potentiometer 20K Potentiometer 57148071 Potentiometer 57148068 20K Potentiometer 57148071 SK Potentiometer 57148068 20K Potentiometer 57148071 5K Potenliometer 57148068 20K Potentiometer 57148071 50K Variable Resistor 72309 1 1 Coils and Inductors 1 301 L302 Coil 2 0mm 724778 Coil L 72477 Coil 1 144T 724766 Coil 1 3 47 724111 Coil LAT 724766 Coil 120 red w case 724775 Coil 14T red wicase 724705 Coil 1 3AT 724777 Cail IMT 724760 Inductor 15 3508904 Inductor 1 WH 35689045 inductor 1 mH 35689035 Coll MC 20 blue w case 724107 Coil MCE20 green wicase 724769 760488 760376 54734000 54712000 54734000 54712000 54734000 34712000 54734000 54712000 Transistor NE 25137 Transistor MPS 901 Transistor MPS 3640 Transistor MPS 3704 Transistor MPS 3640 Transistor MPS 3704 Transistor MPS 3640 Transistor MPS 3704 Transistor MPS 3640 Transistor MPS 3704 878522 206 000 207 800 MHz y remo escritos PartNo RefNo Description Crystals and Filters MX301
63. just VR307 to just extinguish the number 4 LED on the front panel Receive Board 750309 Equipment Required signal Generator Sensitive RF Voltmeter Audio Distortion Meter LJ Spectrum Analyzer VHF Monitor AF Voltmeter C SINAD Meter Y 301 Marking 182 605 218 5 71 905 207 800 171 R905 207 R800 213 213 R800 IA Version 1 Place the RF voltmeter probe tip inside the top of L309 and adjust VC307 for a peak indication IB Version 2 Place the RF voltmeter probe tip 2245 5 213 800 3800 21345 212 8 800 _ 213 425 inside the top of L313 adjust VC307 and C308 for a peak indication Connect the signal generator to a short piece of wire and set it to the oscillator frequency as shown in the chart below Using either a spectrum analyzer or a monitor ad sa ien L307 for a zero beat 171 045 170 245 169 505 207 425 206 800 206 000 212 000 9 IDA 10B 17B 19 Connect the signal generator to the Receive Antenna jack Set the deviation to 3 KHz at i KHz Refer to the chart and select the channel 3 frequency Connect the AF volimeter distortion meter and SINAD meter to 0421 pin 1 Adjust VR421 to maximum counterclockwise Adjust VC301 VC302 VC303 VC304 VC305 and for best SINAD Increase signal generator output to mV Adjust L422 for maximum audio Version Adjust L421 and L422 for minimum
64. lied to this connector Antenna color should match connector dot on BTR 200 Receive Antenna Connector Connect 5 8 wave antenna supplied to this connector Antenna color should match connector dot on BTR 200 Transmit Switch Slide switch that allows the operator to select one of three transmit modes In the OFF position the transmitter is always off This mode may be used if the base is functioning solely as a monitor In the CONT position the transmitter is always on This continuous mode is recommended over the REMOTE mode In the REMOTE position the transmitter is enabled only when one or more portables are active Headset Microphone Select Switch This switch allows the user to select either an Electret or Dynamic microphone This switch 15 factory preset to DYN Position NOTE All Telex headsets that are used with this infercom are dynamic type microphones Intercom Connectors Connections to interface the BTR 200 with a wired intercom system Auxiliary Output Input Connectors Can be used for 2 way four wire input and output to the BTR 200 as a simplex input or output Typical uscs are 4 wire low level intercoms tape recorders public address inputs or outputs or when operating two BTR 200 units simultaneously Power Jack For external AC wall supply adaptor supplied or any filtered 12 to 14 VDC 300 mA source 13 0 VAC RMS 300 mA source Speaker Jack Allows the user to connect an ex te
65. lt gt RI c184 C135 LE wt g T lt gt ES 157 of lo DETAIL A C FENO 0000 o c 2 Rin t EA ase 140 liber doo A 0194 R191 SEE 9 lt gt Y 0900 C154 R175 DETAIL B T o C135 Ev mo 0149 20 a 2080 j R156 1 o e ec ac AZOS TUE i lo O gt ye 2 10 to Q amp C PO O cial I o jo 172 174 C178 C178 m l _ o lo cn oL lo S103 5101 Stos 5410 S105 1 5194 Wa 1449 kt xf Figure 21 T 1111 MAT Audio Board Component Layout Component Side Versions 1 and 2 QU CUM 4 i e u x Dur iid o y O AS a vr I e Loe E f J o l al MER E AJ Qon TM 7 ae NE TC ele T dd _ 1 AL M 1 HE Hu b D 0 ttr LA UI 4 ip S E Toll E m e Du a 1 te 100152 T tit 7 ae HERI EDD 1 re a TEC o Am Y 20221 1 i QUU lg oe Ben E 2 RI I M gene 9 9 A4 os O cist o cs oT io ZEE z il Ir T 14 20 A A R226 7 es BM Adie ZEE o n
66. mic 120 Ceramic 2511 Electrolytic 1 0 Mylar 015 Ceramic 50 1 Mylar 0022 Mylar 0056 Ceramic 330 pF Ceramic 2 51 001 VC301 VC308 Capacitor Trimmer Intergrated Circuits MC3359 MOT IC NE 5532 IC MC3359 MOT IC NE 5532 IC MC3359 MOT IC NE 5532 IC MC3359 MOT IC 5532 w 171 MHz 207 MHz 213 MHz 52676107 35693021 35693022 35603070 35693049 35693017 35693023 52676113 35693019 52676105 35693020 52676113 52723025 52719058 52676113 52719053 32719068 35693024 32676101 52676107 35693021 35693014 35693070 35693017 35693023 52676113 35693019 52676105 35693020 52676113 32723025 52719058 52676113 352719053 32719068 35693024 32676101 723086 4 760454 53295001 760494 53295001 760494 53295001 760494 33295001 Ref No 1301 1302 L303 L304 L305 1306 L307 1 3072 13073 L308 1308283 1309 1310 L311 L312 1313 1324 1369 L370 1371 1372 L373 L374 L419 L420 1421 Q303 0320 0321 9322 0370 Q371 Q372 Q420 0421 Q422 Q470 Q471 Q472 PCB Receive Assembly 878662 Continued Description 20K Potentiometer 50K Potentiometer 20K Potentiometer SOK Potentiometer 20K Potentiometer 50K Potentiometer 20K Potentiometer 50K Potenliometer Coil 2 121 10 min Coil 2 12 CT 10 mm Coil 2 10 mm Coil 2 47 1 4 Tap 10 mm Cail Red Coil TOKO Brown Coil TORO Black Inductor 22 uH Incuctor 15
67. nables the local headset microphone audio func tion NOTE DOES NOT control base station RF transmit Local Push to Talk Indicator Will be il luminated whenever the talk function is on Local Microphone Gain Control and Over modulation Indicator A screwdriver adjustable control 1s provided to control the input level of the local headset mic This input is protected from overloads by means of a gain compressor whose operation is signaled by the gain LED indicator Portable Enable Switches and Indicators When in the IN position the Enable switches allow the user of the corresponding portable unit to be heard by others connected to the system When in the OUT position the respective portable will be muted but this portable will still be able to hear all other selected remotes and interfaces The in dicators normally show the presence of a portable transceiver in use on the channel corresponding to that indicator 27160 B OOLA INTERCOM INDICATOR POWER ON INDICATOR AUXILIARY ENABLE INDICATOR PORTABLE CARRIER INDICATORS LOCAL HEADSET VOLUME Ext intercom Aux Audio ws V A 200 Qo 95 Mic On Push Twice to Late 777 i Fleadsel Controls 7 POWER ON OFF SWITCH oo Portable Station Connect gt ENABLE SWITCHES PORTABLE TRANSMITTERS Volume C LOCAL MIC OVERMODULATION INDICATOR LOCAL HEAD
68. o Board Version 5 2 43 schematic Diagram Audio Board Version 3 44 Display Board Component Layout Foil 5 011 3 48 Display Board Component Layout Component Side a 3 48 11 CHAPTER 1 GENERAL DESCRIPTION The BTR 200 is base station which communi cates with up to four portable units simultaneously in full duplex It may be used alone with a headset interfaced to other equipment such as a hardwired intercom system 1 1 a MEHREREN mn CONTROLS and CONNECTIONS FRONT PANEL Refer to Figure 2 Power ON OFF Switch Push this switch once to turn power ON push it again to turn the power OFE Power ON Indicator The Power ON Indicator 15 illuminated when the Power ON OFF Switch is pushed m the ON Position It remains illuminated while the Transceiver 1s on Local Headset Connector 4 Pin XLR Connector for Input Output The headset jack will accept 6 different Telex Model Headsets Compatible with other intercom headsets with four pin XLR connec tors that are wired as shown in Figure MICROPHONE GROUND 9 BALANCED OUT O O 2 5 MICROPHONE AUDIO Figure 1 Headset XLR Connector Wiring 1 2 Local Headset Volume Adjusts volume to Local Headset DOES NOT AFFECT MICROPHONE GAIN Mic On Push to Talk Lock to Talk Switch E
69. ove circuit board NOTE When refitting this circuit board the volume control on the front panel must be positioned so that the pins and slots mate properly Reassembly is the reverse of these procedures TRANSMIT BOARD CIRCUIT DESCRIPTION US IC is an amplifier whose gain is controlled by the level of audio entering the rectifier at pin 16 As the level here increases the gain is decreased and this results in a 2 1 compression characteristic Pre emphasis is added by U501B R504 R505 and C508 set this at 115uS C531 rolls the response off above 10 KHz to further attenuate the 20 KHz call signal see Audio Board Circuit Description 0501 is a Colpitts oscillator with the collector tuned to the third harmonic 501 VVC501 and VVC502 are added in series with the crystal to allow frequency modulation of the oscillator The oscillator 18 operated 10 KHz below the series resonant point of the crystal This improves linearity at the expense of some stability Q502 is a tripler and 0503 1s a straight through amplifier The carrier frequency is thus nine times the crystal C529 C530 and L503 function as a low pass filter and matching network ALIGNMENT PROCEDURE I EQUIPMENT REQUIRED POWER METER FREQUENCY COUNTER DC VOLTMETER Connect the RP power meter and frequency counter to the Transmit Antenna jack Make sure the Transmit switch on the rear panel is set the the Cont position Adjust T502 T503
70. rnal speaker 8 ohms minimum to the unit Speaker Gain Control Screwdriver adjustable Adjust the gain control clockwise to increase speaker gain or counterclockwise to decrease speaker gain NOTE Leave setting counterclockwise if no speaker is attached 1 5 1 6 Blank C CHAPTER 2 IDENTIFICATION OF CIRCUIT BOARD REVISION AND VERSION AUDIO BOARDS Version 1 and 2 use Rev A circuit boards The This board is installed in the holes for C124 and location for the Rev letter is shown below Version Ci25 sce below Version 1 does not have this 2 contains a small circuit board with a switch See switchboard For Rev C and higher the location Figure 4 for the Rev letter is shown in Figure 5 AUDIO BOARD RECEIVE BOARD SWITCHBOARD 70723 000 REV A COMP aa Figure 4 Location of Rev Level for Versions 1 and 2 AUDIO BOARD REV LEVEL LOCATED UNDER TRANSMIT I 22222 01 I pra r 70723 000 REV C TRANSMIT BOARD Figure 5 Location of Rev Level for Versions 3 thru 6 2 1 Rev C boards can be either Verion 3 or 4 The Rev D boards all version 5 differences are all parts values Rev E boards are all version 6 O was not produced R101 R103 R125 R130 R131 R132 R133 n R162 R168 R170 Ce ee see LSK 5 6K 2 zu RECEIVE BOARD The BTR 200 uses one of two receive boards 750309 COMP REV og o oc ioc des pts E
71. rs 0111 and U119B U107B in versions I and 2 drive the headset while U108 drives the external speaker jack On versions 1 and 2 this signal was derived by mixing the microphone signal with the intercom output via R175 and R177 On later versions the intercom output alone is used being first amplified SII2B maintains the headset speaker level constant when switching intercom output levels Transmit Mixer and Filter U1O6B mixes the intercom input auxiliary input microphone and receive board signals together to modulate the transmitter VR102 is used to set the level going into the transmit compressor for proper tracking On versions 3 and later U118 acts as a four pole Chebyshev Iow pass filter with a cutoff irequency of 5 KHz This is to prevent transmis sion of the 20 KHz tone which Telex intercoms use as the call signal 3 28 Output UIIOA mixes together intercom input microphone and receive board signals UIIOB inverts the resultant to provide a balanced output Remote Transmit Circuit When the transmit switch on the rear panel is in the remote position the transmitter will only operate when at least one recetve squelch is open On versions 1 through 4 this is done with U115 which turns on Q109 Versions 3 and 4 have a circuit board error however which prevents this option from working To correct this move the inputs of 015 to the left side on the schematic of R195 R198 R201 and R204
72. se the output to m V Move the audio hook up to U471 pin 1 Adjust L472 for maximum audio Version 1 Adjust L47 and L472 for minimum distortion Version 2 Adjust 1471 L472 and L473 for minimum distortion Adjust VR470 for 140 mV of audio Set the signal generator output to 1 uv Adjust VR471 fully clockwise then turn it counterclockwise until the number 4 LED on the front panel just comes on NOTES Voltage Tables Receive Board 70714000 Q308 0310 o Q305 Q307 Q309 0311 pices uti AE reis 0 005 609 2 07 4 PIN NUMBER 3 0301 0304 0306 M UN TU U309 EE EET h 5 dum 22 a HHTHH 07 Pa 98 rt t ta AA 44 6 HHH A Voltage Tables Receive Board 70714000 Continued Voltage Tables Receive Board 750309 Continued DEVICE DEVICE PIN NUMBER L EEE Xa ome De is Jafo usos ro ss s NEL n alot ere baal U320 037 0420 0302 0303 0305 0307 0308 0310 PIN NUMBER DEVICE Pad designations are the same PNNUMBER PIN NUMBER NOTE if this part is pevice venston Q302 0320 0370 0420 0470 0320 0370 x 0420 0470 EN 0321 0371 x 3 079 077 NO SIGNAL Q421 Q471 Q321 Q371 035 UNSQUELCBED Q321 0322 0371 Q421 Q
73. tenna jack Set the deviation at 3 KHz at KHz Refer to the frequency chart below Look at the marking on the Y301 and set the generator to the corresponding ALIGN fre quency 15 Place the RF voltmeter probe tip on the collec tor of Q303 and adjust T301 T302 and T303 for a peak indication Marking 171 905 171 045 207 800 207 425 213 800 J f 169 505 206 000 212 000 170 245 206 800 212 800 eee 171 R905 207R800 2138800 213 425 2 Adjust VR309 for 0 44 VDC across R312 16 In the following alignment unless otherwise directed adjust the signal generator output 3 Place the RF voltemter probe tip inside the top level to maintain a DC voltage of between and of L307 and adjust VC307 for a peck indica 1 5 volts tion 17 Set the signal generator to the channel fre 4 Set the RF voltmeter to its most sensitive scale quency without stray pickup 18 Adjust T304 T305 and T308 for maximum 5 Place the RF voltmeter probe tp inside the top DC voltage at pin 5 of 0301 of L301 19 Set the signal generator output to mV and 6 Increase the signal generator output level until adjust T309 for maximum audio at pin 7 of the RF volimeter indication just begins to rise U303 7 When adjusting reduce the signal generator 20 Adjust VR302 for 140 mV of audio at pin 7 of output rather then reducing the RF voltmeter U303 sensitivily 21 Set the signal generator output to 1 and 8
74. und Coil Air Wound Coil Ar Wound Coil Air Wound Coil Air Wound Crystals Crystal 177 800 MHz Crystal 183 730 MEI Crystal 154 570 MHz 52978000 32978002 52979000 52977003 63725000 63725005 63725000 63725005 63725000 63725005 52989120 52989214 52989100 All resistors in ohms 1 8 Watt 595 unless noted R501 R502 R503 R503 R504 R505 R506 R508 R509 R510 R511 R512 R513 514 R515 R516 R517 R518 R519 R520 R521 R521 R522 Kesistors 30K Version 1 15K Version 2 1 5 47K 820 47 47K SOK 100 47 6 2 K 470 56 47 Version 1 68K Version 2 LOK Connector 52154025 52154044 52154032 52154036 52154056 52154020 52154036 52154062 52154092 52154020 52154042 52154084 52154092 32154038 52154068 52154090 52154092 52154036 52154016 52154036 52719004 52676101 C531 Ceramic 0033 Version 1 C531 Ceramic 001 Version 2 Header 3 pin 670062 Variable Capacitors V C501 VC502 Variable Capacitor 35837007 i Transistors 0501 0502 Transistor 2N5770 54689000 Q503 Transistor MPS 901 760376 Integrated Circuits 1501 IC NE575N 53277003 11502 IC 28108 54680005 Diodes Diode MV2108 58675000 V VC5D2 Diode 2108 58675000 Variable Resistor 57148068 3 7 3 8 Blank Frequency 177 800 MHz 183 730 MHz 154 570 MHz SK Vartable resistor RECEIVE
75. urrent source and was added to provide more headroom To this end U107 is operated from the higher voltage ahead of the regulator 5104 isa 9 section D1P switch which is used to configure the base for compatability with a specific wired inter com 5103 functions as either an Intercom on off switch Telex Clearcom standard or as a channel A B switch RTS Cleatcom TW In the case where the intercom interface is disconnected by 5103 RI86 functions as the load resistor The full secondary of T101 is used for 300 ohm intercoms the tap is used for 200 ohm systems On version 2 and later 5112 allows selection of either low output 100 mV or high output 800 mV Intercom Input since U107A is a current source signals arriving from an external intercom appear unloaded at pin and are coupled via C126 and R154 to 9106 To prevent intercom output signals from appearing at the output of 0106 these signals are nulled by the branch containing C124 and R152 UIOGA and 1109 form a peak limiting amplifier similiar to that described for the microphone amplifier above except that CA TOI is used instead of a JEET to control the gain The reason for this is that the higher level signals being handled by UIOG6A would cause high distortion if a JFET were used CAIOI is merely an LDR light dependent resistor together with an LED in the same package More current through the LED reduces the value of resistance Headset and Speaker Amplifie
76. ut frequencies U320B contains a limiter and quadrature detector which is tuned by L322 U320C functions as a 94 KHz bandpass filter for operating the squelch With no signal a large amount of noise is present at U320 pin 3 and a portion of this 1s rectified by Q321 If the emitter rises above 7V U320D clamps pin 16 to ground muting the audio and drives pin 5 low extin guishing the LED on the front panel via 0322 When a signal is received the noise at U320 pin 13 drops and lowers the voltage at the emitter of Q321 releasing the audio clamp and lighting the front panel LED Since the LED current flows through R331 the voltage drop acts on 0321 and provides hysteresis VR321 adjusts not only the noise amplitude delivered to 0321 but also the D C bias and is used to set the squelch at 1 microvolt From 1320 the audio is buffered and filtered by U321 R328 C335 and VR320 set de emphasis at 11545 0321 Ais a three pole Butterworth low pass filter with cutoff frequency of 19 KHz F TTT TTT es ATT ee _ ALIGNMENT PROCEDURE Receive Board 70714000 11 Place the RF voltmeter probe tip inside the top of L304 Equipment Required LJ Signal Generator Sensitive RF Voltmeter DC Voltmeter 1 AF Voltmeter 12 Adjust VC304 for a peak indication 13 Adjust VC305 for a null indication 1 Connect the signal generator to the Receive 14 Adjust VC306 for a peak indication An
77. yout Component Side Version 2 750309 9329 WESH J 2321 ran ki t 1 TE ena 384 Cum T OA AN X woz 1305 IM AJO 1 Lat i Y T Ra 1 2x 470 MPH ME EMI RI REL LL 10 10 ANA NARS nhs UE 1 7 25252 1 FREQUENCY DEPENDENT COMPONENTS TABLE FREQUENCY 1 2207 css 0422 care 5 ager 3 2Pr sore 1158 1208 MPS 33PF XIPF ang d 4 33PF 33er ager 33PF 1805 aer Wate 11 20r F RARI mz 1 5 qua hr WRA7O Rid 10 wee CAD cu 2 1 1 ____ _ Figure 18 Schematic Diagram Receive Board Version 2 750309 PCB Assembly 878662 3 20 x PCB Receive Assembly 878522 Ceramic 390 pH 35693025 Ceramic 75 pF 35693061 Ceramic 82 pF 35693018 Ceramic 68 pR 35693017 Ceramic 75 pF 35693061 Ceramic 1 35693054 ic 1 1 2 C301 Ceramic

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