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Pro Soloist Service Manual

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2. ENVELOPE 2 VOLTAGE CONTROLLED GENERATOR AMPLIFIER BOARD B ENGL YS 36 E VOICE CODE 0 0 1 1 2701 VOICE FLOW CHART VOICE SPACE REED 2701 BOARD TEST POINTS RE FER TO THE SCHEMATICS FOR BOARDS A B amp C FOR THE LO CATIONS OF THE TEST POINTS BOARD A WAVEFORM GENERATOR BOARD PULSE OUTPUT SAWTOOTH OUTPUT lt s s s ee ee lt a lt s n s s s PULSE AMPLIFIER SAW PULSE MIXER 0 HIGH O PASS FILTER RESONATOR BANK 3 5 RESONATORS VCF VOLTAGE CONTROLLED FILTER LOW PASS ADSR ENVELOPE GENERATOR AR 2 ENVELOPE GENERATOR VOLTAGE CONTROLLED AMPLIFIER _ __ Qm er BOARD B 27 2701 VOICE FLOW CHART VOICE SAX 2701 BOARD TEST POINTS RE FER TO THE SCHEMATICS FOR BOARDS A B amp C FOR THE LO CATIONS OF THE TEST POINTS BOARD A WAVEFORM GENERATOR BOARD PULSE DYNAMIC SAWTOOTH OUTPUT POSE OUTPUT BOARD C PULSE AMPLIFIER SAW PULSE MIXER HPF HIGH PASS FILTER CELLO 2 CELLO 3 E BASS J Q OBOE RESONATOR BANK 3 5 RESONATORS B D lt m es wt s
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4. 3 ON 5 aas 7 539 unay A1775 o e _ EE W3 223 ANISIVANM ONIOVA SAOLSIGNVYL S3 A 73A 3 LON 62 BOARD A REFERENCE 27 219 214 223 24 25 26 25 22 4 9 222 218 711 12 713 16 721 718 210 17 220 215 1 2 3 4 5 6 Q1 Q2 Q6 7 O8 Q5 03 04 C17 18 045 15 C20 C19 R29 R24 37 49 R38 R40 R11 R32 P2 P3 S1 BOARD B REFERENCE 76 74 75 71 72 73 01 4 6 03 78 02 5 CR1 27 C2 C3 C12 J4 5 ARP PART NUMBER 5602104 5700401 1400801 5602106 1401901 1401701 1402801 1402501 1402701 1402401 5601801 1402101 1401801 5700501 5600701 1200301 1304601 1302401 1301701 1302801 1301601 7502601 1100612 1100601 1100602 1101104 1000901 1000909 5700703 5700702 5700701 5700704 2200805 2200806 1900801 ARP PART NUMBER 1400801 1401701 1401901 5600801 5600901 5601001 1304601 1301701 1302801 1200301 1101103 1100608 1100611 2101302 2101301 PARTS LIST ARP MFG NUMBER C 8000 005 7405 2701 011 8 2801 009 C 8000 005 7412 C 8000 005 7403 C 8000 005 7400 C 8000 005 74121 C 8000 005 7473 C 8000 005 7493 C 8000 005 7454 A2801 008 C 8000 005 7410 C 8000 005 7402
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8. OJo o o O O OJO o o O O OJO O O 5 OO O O O O O O O O a OO O O O O ni O O O O O 1 1 0 0 0 1 0 2701 R O M TRUTH TABLES VOICE CODE 2701 BOARD TEST POINTS RE FER TO THE SCHEMATICS FOR BOARDS A B amp C FOR THE LO CATIONS OF THE TEST POINTS ONLY OM KEY DOWN SN 10 CELLO 2 2701 VOICE FLOW CHART BOARD A WAVEFORM f GENERATOR BOARD PULSE SAWTOOTH OUTPUT i OUTPUT PULSE AMPLIFIER SAW PULSE MIXER HPF HIGH PASS FILTER CELLO 4 CELLO 3 RESONATOR BANK 3 5 RESONATORS VCF VOLTAGE CONTROLLED ADSR FILTER LOW PASS ENVELOPE GENERATOR VOLTAGE 69 ENVELOPE CONTROLLED GENERATOR AMPLIFIER URN ERIS qe VOICE BASSOON VOICE CODE 2701 VOICE FLOW CHART VOICE ENG HORN 2701 BOARD TEST POINTS RE FER TO THE SCHEMATICS FOR BOARDS A B amp C FOR THE LO CATIONS OF THE TEST POINTS BOARD A WAVEFORM GENERATOR BOARD PULSE SAWTOOTH OUTPUT 4 OUTPUT BOARD C PULSE ANPLIFIER SAW PULSE MIXER HPF CELLO 4 CELLO 3 HIGH PASS FILTER 0 2 RESONATOR BANK 3 5 RESONATORS VCF VOLTAGE CONTROLLED 3 ADSR FILTER LOW PASS ENVELOPE GENERATOR AR
9. AB4 ano 425130 Iw 32A trates frumos auo v awvoe von 04 Aha OQ n Q td a 18 ert 0A e WA feeupaf yu 5 X 5 Dwr V 4794 epe 2 yr c en NO O LC 1 9 wors 270 i9 702489 30 nues q HE ge i 9 e Atg o ef E k 5 gt I 440 32 A 21001 SNIH21I AAS YOIYNOS3 2 S O ASY TAIT TW ECO IOLT 296 4131 SLIM 1399794174 o 49 ff i SIATA wey 33v 2x40 SHO NT SIAYA 001515939 162 082 bly 5390 sz y 2 12 PIO 82 1190 way 7 38 512 MO 2911 PONE AIAN dois 4 PQ 3i Lf 3 b LC 1 g uf ito o 9 L PLU 3093 i 99 60 210 8 L L i x ww 3 20m 4 T t L y qg word S LS0 lOLC V 150 lOL2 V N3339 3518 id dwv asind P 39 3 dih O4 OL 80
10. 1 1 0 0 0 0 0 1 1 0 O0 O0 0 0 1 0 0 1 1 0 O O O O O O 1 1 SELECT AR ATTACK A H P BOARD B Z3 00114101111 100 1 1 1 1 1 01 10 0 0 111010 9 LOGIC 1 SELECT VCF ENV ATTEN D 0O01 0 1 01 0 1 1 0 0 1 1 1 1 1 1 1 1 1 0 0 1 010 7 LOGIC 1 SELECT VCF ENV ATTEN C 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 111100 6 LOGIC 1 SELECT VCF ENV ATTEN B 1 1 1 1 1 0 1 11 11 1 1 11 1 1 1 1 1 1 1 0 1 1 1 0 0 5 1 SELECT ENV 00 1100111 1 1 11 1 1 1 1 1 1 1 1 0 1 1 1 1 0 4 1 ROUTE ADSR TO VCF 0 1 1 1 1 1 1 11001 1 1 1 1 1 1 1 1 1 1 1 1 11 1 1 0 3 LOGIC 1 ROUTE ADSR VCA 1 10 0 1 1 0 0 0 0 0 0 1 1 0 0 0 0 0 O O 0 0 1 2 LOGIC 1 ROUTE AR TO VCF 1 00000 00110 0 1 1 0 0 0 0 1 1 0 1 0 0 0000 1 LOGIC 1 ROUTE AR TO VCA 2701 R O M TRUTH TABLES 2701 TRUTH TABLES a ul fae Oca 5 Uu Q E zu 2 o ju o NE Z Z 528 lt r 5 x 9 r ju 2 w 1 ul o jO Cir lt o ml Z pm 5 lt m O uj SWI E tu N2O00 Te d g NZ u ziouounvio N NZuu o22 F 2 I 2 54 12 wc 20 5 l
11. ovy O cs ANIM 9 QLY AQ ved bL 19 2 OLY La S QL t OLY 56 OLY Va 21 9 OCLC 0 0 3e lt lt weg tod Let g 0154 474 i 5 Td 33 LSM Siva g3dis H10 HeINavA AYITD ABAOD NI MOVIE 9016 9NI vHO SIHL 40 dWVLS MN39gna v 39 38 ASSY Q3HCINIS S LZ NAHL YZ Iuvdu3 lNnOD 7vNOOvIO S l ANY TMOQ QN3 2 27 30 32w d 2 69 gQvav4O2ld d 2407 BAY xol vavo o 4E H UH dat SWHO 3elv San IVA 2Q1SIS3S2 OL 03 dO Qaui 3dC ACINABHLO 3 v SALON 2 H2 NYHL 8192 338 2270 2 BOIS SIHL 2 L v 3399 033 3 3 33 9 N UU Iu Oa d 92 J gt Ot u 62 H2 42226 22u2 S212 0 t 282 22220 C SATE EAI UI 115 sis 2e 8 ue ec es s PC ec 25 A 7 d 2792 wind g TE 6u2 guo LYD 990 EY ED TZ 9 e 9 Q Q 2 LJ CI o J e D 8 2A H t SPP PSI
12. 2 9 3 M PEL q EX 5 p oor q N2 E uu 4 SEEDS TEE 5 SN L k ogy 2 N33u5 4185 N HL H2 T 3 LON AQIS 2 BOIS dWOD 390 9 SBIvV Id 2 539105 831 132 8 30 65 57 kI we Aiddng 1 g Lyx Aor PI29 q 072 5 PORE So ost Ll 55 Oc des 82 8 7 x c 3 c ina i JILVIN3HOS 5 0 0 Tene V ore 22 SI 9 m yi loon N1 oty 232 ANI S id e a 2 52 ASE ol Q2 HO O ZEZAN lt 2 21 m 7 5 3 9 7 ond 035 XV 52 T ay ME E gt RE Bh hh NI Q T ASE i 2 27 3 AOS ma Woes z 22 yov Si D i 9 omy 2 i SAMO 135 TY haora 8 MBIA 58 ORIGINAL BOARD LAYOUT epis 1080 429 sx 820 1022 4 59 VD ONITIWISN 3803438 WHIT OI 1v 4 DNIA NON UNNI WOT 0 1 do 8
13. ONY 62 6 58 u pte JILVIN3HOS V 1012 uar vedre APY E aA LN3LYd 5 H3aNn 038 13 92 HOO Opa 30 Q SE SPL O12 ez lt 17 ep 8 122 Ep wor Sa 5 999 se UPL d d D w 2701 BOARD A LAYOUT 45 n W S x 13 HOS g 41353u4 VIA OL v a 116344 OL 94 DI 2 907 ino 3499 atvara Q Qwd 2 4 lt Qa NI 2119 9 6 E 290 q IY A o euler 3 SC pw LSPHOIH L 47229192 NM Sw d XI n AT QUSIAN3QI SINTWA 4d 3 8 NI 3 n71vA 5 6 NI SINIYA 11v 13Q32wJA1S 8 ua3W4 0 91 984 Lw3cau ANO Ni and NAD Lawl 3990 gg 219005 91 3 0 23735 Fen ga 320 gt ZLY AOULNOD eo gt 7 2 A gjs o v gt 2 o win v 91 99 x98 OLY Pi Finyap 4 gt 1 2 gt n t L O IOLT W 7
14. BOARD G REFERENCE 21 Q5 9 10 Q4 7 Q8 Q1 6 Q3 Q2 CR1 2 3 4 7 CR5 6 R2 R17 R5 R13 C7 C2 3 C8 C4 C5 C6 T1 F1 51 52 17 21 2 23 24 25 26 7 1403201 1402501 1200301 11006102 2101302 2200803 ARP PART NUMBER 1401701 1403701 1901001 1901002 2101301 2101302 2200804 ARP PART NUMBER 1401301 1301701 1302801 1302601 1303401 1302201 1301801 1200401 1200201 1000310 1000108 1000915 1100607 1100612 1101701 1101702 1101501 5702201 1700403 BOARD PRO DGX 1901002 1902901 1403701 1401701 1400501 1403001 1405601 C 8000 005 8601 C 8000 005 7473 IN4148 TAGOO 3 3 20 10 10 16 511 10 B 2701 070 1 B ARP MFG NUMBER C8000 005 7400 SN74148 02 481 0009B 02 481 0010B 14 511 10 16 511 10 B2701 070 2 ARP MFG NUMBER UGA7723393C 2N5172 2N6076 2N5494 2N6179 2N5367 2N5232 IN4448 IN4001 1 4 5 4 7 BWH 2 0 270HM U201R104B TAGOO 47 35 20 20 TAGOO 10 35 20 20 B41283 250 10 B41010 250 50 16T3300 C 2701 028C MDV 02 481 001D DIGITAST ST 2N74148 2N7400 CA3086 2N74174 2N74145 RETRIGGERABLE ONE SHOT 4 BINARY COUNTER DIODE SI SIGNAL CAP TANT 3 3uf 10 20V SOCKET 16 PIN PLUG TO PLUG ASSY 14 PIN DESCRIPTION I C Quad 2 INPUT NAND GATE PRIORITY ENCODER SWITCH ROCKER DPDT BLACK SWITCH ROCKER DPDT WHITE SOCKET DUAL IN LINE 14 PIN SOCKET DUAL IN LINE 16 PIN PLUG TO PLUG ASSY 14 PIN DESCRIPTION I C VOLTAGE
15. board E on 4 6 and J4 7 Z5 pin 3 provides a logic 1 which allows R64 to charge the integrating capa citor O4 and O5 follow the voltage and supply it to the switching circuitry to be routed to either the VCF and or the VCA is a peak detector comparator When the ADSR output reaches the maximum voltage about 5 volts 06 resets the R S flip flop output Z4 pin 3 to logic 1 The voltage on C3 then discharges through CR16 CR 17 or CR18 to the voltage level on the junction of R30 R31 and R32 sustain level When the gate on J4 6 is no longer present all keys up the remaining voltage on C3 discharges through CR20 and pins 3 4 or of Z1 to zero AR The gate voltage is supplied to the AR circuit from Z5 pin 8 to charge capacitor C2 through CR2 or CR4 When all keys are released the voltage on C4 discharges through CR5 or CR6 back to pin 8 of R O M Z3 selects which envelope ADSR and or AR is to be routed to P6 16 the VCA control input Z3 also selects which envelope is to be supplied to Z6 R1 R2 and R4 attenuate the envelope before it is processed through Z6 Z6 sums and inverts the ADSR or AR envelope the growl signal from board D and the touch brilliance voltage from board D The envelope must be inverted because the VCF accepts negative going control voltages The output of Z6 is connected to the control input of the filter via the brilliance silder on board A 07 Q8 and Z4 pi
16. m m o Lp A c c m e wm 211 0221 Depressed pulse updates 6 bit memory VOICE CODE TRUTH TABLE 6 6 Board 11 Circuit Description In order to minimize the number of interconnecting wires between the Voice Select board and the rest of the Pro Soloist the 15 Voice Select switches are encoded into five bit binary words In this manner it is possible to send over five wires all of the informa tion necessary to say which of the 15 switches has been depressed Separate wires are also brought out for the portamento switch In addition a Voice select squelch line is also brought out which indicates when none of the switches are on OFF OFF Buzz Bassoon Bassoon Saxophone English Horn Space Reed Oboe Telstar Clarinet Song Whistle Flute Noze Tuba Pulsar Trombone French Horn Trumpet Comic Wow Mute Trumpet Steel Guitar Cello Harpsichord Violin Space Bass Electric Bass Electric Piano Banjo Fuzz Guitar Steel Drum Country Guitar Fuzz Guitar 11 O O O O Oc O OOO OOO O gt O 6 7 Board G Power Supply Counts 1 9 31 63 pin 10 An apparent malfunction of th
17. D 0010 DH 0011 0100 F 0101 0110 0111 GZ 1000 A 1001 Af 1010 B 1011 Not used 1100 1101 x Tn 1110 u 1111 Octave1 0 Octave2 01 Octave 3 10 Octave 4 11 High C only In order to generate these coded outputs the cir cuitry on board E is designed to scan the keyboard about 100 times per second When the scanning cir cuitry comes to a note which 15 pressed down by the performer the number corresponding to that note is loaded into the 6 bit memory at the output and a gate and trigger pulse are generated An oscillator Z2C Z8D Z8B and C3 produces a square wave at about 150 KHz The output of the oscillator is fed into a six stage frequency divider Z4 amp Z5 The first four stages of the frequency divider Z4 are wired to a data selector chip Z11 The outputs of the six stage frequency dividers pro duce a six bit binary word which counts from 00 0000 to 11 111 0 to 64 The first four divisions 6 STAGE FREQUENCY DIVIDER OUTPUTS of the frequency divider are connected to the data selector chip which moniters the changing code The last two divisions octave information are decoded so that only one bus rod is enabled at a time enabled is logic The inputs of Z11 are wired to the keyboard contacts such that all C s are wired to pin 8 CZ s to pin 7 etc When a key is depressed one of the outputs of the octave decoder is connected to one of the inputs of the data selector chip
18. P3002 0 11 JL wht 314 9 105 aco E 9 200 1022 0 ILO IOLT ILO IOLT q TIL 69 s SONON10313 3 QuvomA3x V 3 i TT 90853 WA OL YA Til 45A ei 1065 69 10 7 T RT Coane UEM 111153 7 5 6 a j a o 5 Ir 7 91 9 j 5 gt 2 0 00 0 p T 2 5 id i M 0 2 0 s tots 100 1022 2 LU pesos 790 169 06 3904 nyw 18111111 4 oT 0 _ O ouvoa x 9 pried F po FAR 0 00 agaga l Id 91 is vd T 23 9 pl 1 4 6444600000600 g n u AS b 4 5 agh 4 1676 191771917 s ieu LEY 9 allas or _ lt g OL vA ES 6 9 334 EE 00 10L2 0 H 900 1022 2 5 58 3 39
19. Pin 10 of Z11 will be logic 1 only when the following occurs 1 A key is pressed to enable a particular input of Z11 2 The octave decoder output is enabled occurs only when the octave code is correct and 3 The code on pins 11 13 14 and 15 matches the enabled input Example D input is enabled AND code 0010 is present on the data selector input A logic 1 on pin 10 of Z11 indicates that at that in stant the codes on the output of the six stage fre quency divider matches the key and octave depressed The output of Z11 pin 10 is processed through the strobe gate and the R S flip flop to update the 6 bit memory by pulsing the clock inputs of the D type flip flops Thus the outputs of the 6 stage frequency divider are quickly memorized before the number changes Since the only time the R S flip flop changes state is when a key is being depressed the gate memory cir cuit monitors the output of the R S flip flop to provide gate signal 5 volts for as long as a key is depressed The leading edge of the gate signal bar is differentiated and processed through the one shot circuit to develop a 15msec delayed trigger pulse whenever a key is depressed When one key is being held additional triggers are obtained from the 6 bit code change detector The exclusive OR gates provide pulses to the one shot delay circuit only when the key or octave code change when a different key is depressed
20. VOLTAGE CONTROLLED AMPLIFIER ENVELOPE GENERATOR nm r 11 VOICE CODE 12 2701 BOARD TEST POINTS RE FER TO THE SCHEMATICS FOR BOARDS A B amp C FOR THE LO CATIONS OF THE TEST POINTS I BOARD C VOLTAGE 2701 VOICE FLOW CHART VOICE OBOE BOARD A WAVEFORM GENERATOR BOARD 2 9 PULSE SAWTOOTH OUTPUT f OUTPUT PULSE AMPLIFIER SAW PULSE MIXER HPF 9 G9 61 62 63 CELLO 1 CELLO 3 HIGH PASS FILTER RESONATOR BANK 3 5 RESONATORS 29 VCF CONTROLLED ADSR FILTER LOW PASS ENVELOPE GENERATOR AR VOLTAGE ENVELOPE GENERATOR CONTROLLED AMPLIFIER 68 ___ __ _ _ __ m y a lt s s MM VOICE CODE 2701 VOICE FLOW CHART VOICE FLUTE 2701 BOARD TEST POINTS RE FER TO THE SCHEMATICS FOR BOARDS A B amp C FOR THE LO CATIONS OF THE TEST POINTS BOARD A WAVEFORM _ GENERATOR BOARD PULSE SAWTOOTH OUTPUT _ OUTPUT i BOARD C PULSE AMPLIFIER SAW PULSE MIXER HPF HIGH PASS FILTER CELLO 2 CELLO 3 VIO RESONATOR BANK 3 5 RESONATORS B C
21. c March 1976 by ARP Instruments Inc 3rd Printing updated March 1977 1 Introduction Included in this service manual are troubleshooting references which if used properly can greatiy reduce the repair time of the Pro Soloist Section 2 covers the signal flow through the Pro Soloist Section 3 describes design techniques unique to the product Section 4 describes where to start when a problem occurs The circuit descriptions in section 5 should be consulted once a faulty circuit has been identified by the use of the R O M truth tables and Voice Flow charts in sections 7 and 8 VOICES AND EFFECTS Bassoon Buzz Bassoon English Horn Sax Oboe Space Reed Clarinet Telstar Flute Song Whistle Tuba Noze Trombone Pulsar French Horn Comic Wow Trumpet Mute Trumpet Cello Steel Guitar Violin Harpsichord Bass Space Bass Piano Steel Drum Banjo Country Guitar Fuzz Guitar Fuzz Guitar 2 Theory of Operation The Pro Soloist is a hybrid of digital and analog cir cuits The internal flow of the audio signals is in most respects quite similar to any of our other synthesizers That is a raw signal pulse or sawtooth wave is processed through a voltage controlled filter and a voltage controlled amplifier to the output of the instrument Two envelope generators ADSR and AR are available to control the and VCA to determine the attack and decay characteristics of the instrument In addition to the voltage
22. from the VCF output to the input for wow effects 6 4 Board D Circuit Description Board D provides the touch sensor effects Vibrato Pitch Bend Wow Repeat Growl and Brilliance Z3 is a low frequency oscillator producing a triangle wave for vibrato and tremolo and a square wave for repeat triggers Z4 and Z5 are a voltage controlled amplifier exclu sively for the vibrato signal Q3 O4 and O5 delay the Vibrato VCA from turning on for certain voices such as violin producing a delayed vibrato upper voices have delayed vibrato if used at all lower voices have undelayed vibrato 240 and Z4E switch the output of the Vibrato VCA to either P7 11 for vibrato or P7 16 for tremolo Vibrato and tremolo are never on at the same time Tremolo affects the VCF on board C vibrato affects the pitch of the oscillator on board A Z2 B and Z2C are an astable flip flop oscillating at 32 Hz to produce the growl signal This signal is gated into a band pass circuit Z2D and Z2E through CRS The growl output is applied to the control input through Z6 on board B 6 5 Board E Circuit Description The keyboard electronics generate three signals which are routed to other parts of the instrument 1 Pitch information 4 bit key code and 2 bit octave code 2 Gate 5 volts while a key is down 3 Trigger short pulse on each new key depression i The codes for each key are as follows C 0000 CH 0001
23. 0 5 L22212 25704 5 t 9 0 7 JILVIN3HOS 10 2 48 2701 BOARD LAYOUT 000000 AMOS Nid 9 Nid 7 32065 LE S LSO 10Ll v NIRO C pon LISA 49 684 596 2 627 026 2 5 JILVIN3HOS 1042 LN3LVd 5 vo Ww 9966 54 0006765 v 2 460 10L9 V Aq 900 819 AY SK 1990 waw 98S0 i049 9 ASSY W 0 10413 BAS 16 7 MLO MENNA AYNI BDA TY MAMIE PARANA NI SBMA Prien IPGK Ww Y Pp NOULISO NI NOMS TY F 470 Yep OVER BBS 140195 wont SANYA 010 10 2 BES WowdwsiN DOM 159 20 so EMITE We AU E _ Gl H L4 0193 Mve NOVI sra 1 sy DO 6 5 62 7 00 6 T Sim 7 8 322 022 02 Seo OU ere 22 OND T jo 9 50 82 12 et AMO apio Tor 709d 32256 wir eS Ale 3
24. CAMPLITSDE DURIN amp KEY DEPRESS VCF VOLTAGE CONTROLLED ADSR FILTER LOW PASS ENVELOPE GENERATOR AR VOLTAGE ENVELOPE GENERATOR CONTROLLED AMPLIFIER Q8 s s BOARD B s s s K I L ayp c 14 VOICE CODE 2701 VOICE FLOW CHART VOICE TUBA 2701 BOARD TEST POINTS RE FER TO THE SCHEMATICS FOR BOARDS A B amp C FOR THE LO CATIONS OF THE TEST POINTS BOARD A GENERATOR BOARD SAME FLOTE C DOWN 3 Oc TYrvv es Shae aS PULSE SAWTOOTH OUTPUT OUTPUT BOARD C PULSE AMPLIFIER SAW PULSE MIXER HPF HIGH PASS FILTER CELLO 2 CELLO CELLO 3 RESONATOR BANK 3 5 RESONATORS B VCF VOLTAGE CONTROLLED ADSR FILTER LOW PASS ENVELOPE GENERATOR AR VOLTAGE CONTROLLED AMPLIFIER ENVELOPE GENERATOR BOARD B o M s h s s s s e 4 i lt r 15 VOICE CODE 2701 VOICE FLOW CHART VOICE ELEC BASS 2701 BOARD TEST POINTS RE FER TO THE SCH
25. E VOICE CODE 1 1 2701 VOICE FLOW CHART 2701 BOARD TEST POINTS RE FER TO THE SCHEMATICS FOR BOARDS A B amp C FOR THE LO CATIONS OF THE TEST POINTS VOICE HARPSICHORD BOARD A WAVEFORM GENERATOR BOARD PULSE SAWTOOTH OUTPUT OUTPUT PULSE AMPLIFIER SAW PULSE MIXER HPF CELLO 3 HIGH PASS FILTER CELLO 2 RES BANK 2 RESONATOR BANK 3 RES 3 5 RESONATORS VCF VOLTAGE CONTROLLED FILTER ENVELOPE GENERATOR LOW PASS AR e ENVELOPE l VOLTAGE CONTROLLED GENERATOR AMPLIFIER 29 D E VOICE CODE 0lo 1 01 0 2701 VOICE FLOW CHART VOICE TELSTAR 2701 BOARD TEST POINTS RE FER TO THE SCHEMATICS FOR BOARDS A B amp C FOR THE LO CATIONS OF THE TEST POINTS BOARD A WAVEFORM GENERATOR BOARD PULSE SAWTOOTH OUTPUT OUTPUT PULSE AMPLIFIER SAW PULSE MIXER HPF HIGH PASS FILTER CELLO 2 CELLO 3 21 m ul 9 gt K RESONATOR BANK 3 5 RESONATORS RES BAN B C sh qu s lt e m W e p r m q ma s s s SOR NUES VCF VOLTAGE ADSR CONTROLLED FILTER LOW PASS ENVELOPE GENERATOR AR 2
26. I C QUAD 2 1 GATE I C QUAD 2 1 NAND GATE O C COLL PROGRAMMABLE R O M PROGRAMMABLE R O M PROGRAMMABLE R O M TSTR TSTR SI NPN TSTR SI PNP DIODE SI SIGNAL CAP POLY luf 1076 100V CAP TANT luf 10 35V CAP TANT 3 3uf 10 35V SOCKET 16 PIN SOCKET 14 PIN BOARD C REFERENCE 71 72 3 74 75 76 77 78 Q4 5 6 12 Q11 01 2 37 8 9 13 14 CR1 2 R45 X R20 54 M1 C43 C31 C39 C2 3 4 C41 BOARD D REFERENCE Z5 23 22 4 21 Q5 01 2 34 CR1 9 R20 C12 C14 C11 C10 S1 7 P6 P7 BOARD E REFERENCE Z7 78 76 75 79 21 73 71 2 10 ARP PART NUMBER 1400401 1401101 1402001 1401901 5601101 5601201 5601301 1301701 1304601 1302801 1200301 1000901 1000913 7201001 1101102 1100143 1100606 1100612 1101104 2102302 ARP PART NUMBER 1400801 1401101 1400501 5601401 1301701 1302801 1200301 5601802 1100609 1100610 1100612 1100606 1901002 2200805 2200806 ARP PART NUMBER 1401701 1401801 1401901 1402501 1402601 1402901 1403001 1403101 ARP MFG NUMBER B4023 006 2 A 2801 008 C 8000 005 7405 C 8000 005 7403 A2701 057 5 A2701 057 6 A2701 057 7 2N5172 TZ 81 2N6076 4148 U201R101B U201R503B 4034 004 PL C 225P47391WD3 LTMD TAGOO 47 35 10 10 TAGOO 10 35 20 20 225P 22492XD3 16 511 10 ARP MFG NUMBER A2801 009 A2801 008 CA3086 A2701 057 8 2N5172 2N6076 IN4148 B2801 010 2 TAGOO 1 35 20 20 TAGOO 1
27. REGULATOR TSTR SI PLASTIC NPN TSTR SI PLASTIC PNP TSTR SI PLASTIC NPN PWR TSTR SI PLASTIC NPN PWR TSTR SI PLASTIC PNP TSTR SI PLASTIC NPN DIODE SI LOW CURRENT DIODE 51 MED CURRENT RESISTOR CARB FILM 5 6 5 1 2W RESISTOR WW 0 270HM 10 2W POT TRIM 100K CAP TANT EPOXY 47uf 20 35V CAP TANT EPOXY 10uf 2096 35V CAP ELECTRO ALUM 250uf 450 1096 CAPACITOR ELECTRO 250 UF 10V CAPACITOR ELECTRO 33 UF 16V TRANSFORMER FUSE PIGTAIL SLOW BLOW A SWITCH ROCKER DPDT WHITE SWITCH PB SPDT IC ENCODER 8 LINE PRIORITY IC GATE 4 X 21 NAND IC TSTR ARRAY IC FF HEX TYPED IC DECODER EELZ 13800 LO 6LZ4 38 A18W3SSV 9 auvog X9Q OMUd E OG E y hii O 212 ae 2215 19 064 5 62 2 3 9 OSL e jo HO eco 220 Lvo ds 9 LM Hz A S veo Spo 7 2 Hee DOGEN W21 19 0S2 NOISIA3H SONIMVHG 19 3387 8 2JI1VW3HOS 2 2212 0212 STAGOW X9G OHd cel 8 ERAZ IPPON XDG OUd m x 912 Kolm TON 59448 Gs aoe 22 2 3 MOLY 55 8 BORO ys 509 43 U ANYS 20 VNOS33 wi SEVE 241521339 512 l OSI 964 88 onn Or SOI 21 ONY lai Xo too 2
28. controlled filter there are fixed band pass filters which shape the raw waveforms for particular voices In variable synthesizers such as the ARP Odyssey or the ARP 2600 the signal paths oscillator waveforms and filter characteristics are adjusted manually In the Pro Soloist each of these settings are programmed by a digital memory Read Only Memory or R O M Referring to the block diagram Board A is the CONTROLS Portamento Enables the pitch to slide from note to note Portamento Speed Regulates the time required to slide from note to note Touch Sensitivity Controls the over all amount of keyboard touch sensor effects Brilliance Permits the addition or subtraction of brilliance Volume Regulates the over all volume of the instrument Repeat Creates the rapid pick strokes of string instruments Vibrato Repeat Speed Controls the vibrato speed and repeat rate Octave Transpose Switch Transposes the instrument up and down one octave Waveform Generator board A sawtooth wave and a pulse wave are supplied at the correct pitch to Board C the Filter board Board C contains the voltage controlled filter VCF the voltage controlled ampli fier VCA and 14 fixed filters The signal paths through board C are determined by the R O M out puts which select one of several paths through the different filters Board B provides the ADSR or AR output to the VCF and or the VCA again dete
29. 1 oo o olo 210 ole najo oO Xu e d gt 28 1 ROUTE NO 3 RES 1 ROUTE NO 3 RES TO VCA 1 ENABLE OBOE RESONATOR 1 1 ENABLE E BASS RESONATOR LOGIC 1 ENABLE E PIANO RESONATOR LOGIC 1 ENABLE VIOLIN 1 RESONATOR LOGIC 0 ENABLE RES 1 amp 2 CELLO 1 2 amp 3 LOGIC 0 ENABLE RES 1 amp 2 VIOLIN 2 3 ENABLE GROWL B MAX ENABLE GROWL A B ENABLE VIBRATO C MIN ENABLE VIBRATO B MED ENABLE VIBRATO A MAX ENABLE VIBRATO 0 TREMOLO ENABLE FILTER OFFSET C D ENABLE FILTER OFFSET D 0 10 ojl olo o ojo gt ojo ojo OIO O O O O OJO O gt OIO OIO O IO O O O gt I O
30. 1 3 552 BEY vow 409 5 91 eeu dots IMIA 61 42 ea wee ONIADVUL HE 0777 8 1 x ll a 988088 ae a 4 te 2 HP s v gt WERDE was 1 Mu 5 i M ant m aa 5 HE T HH 8 i eH poses wowed 6 10 9 2 am x alo oc els eni 1 1 2 Sac gentem E 2 ise 2 2 S 3 2 cete E 5 3 lt 5 0 2 DN 8 0 fy 35 38 ree m E 88 45 z 5 eo 2 38 3 55 595 3 i ge i ar fF gt 3 2 z a 3 BO 123139 3302 802101113860 32012 21U04429 3 3 009 1042 prsren 7 Osr gt ino 3 hd 3320181 282 IY 39 410 0 SU y bE lo 4 13 9073 tz Su amp T 9 3 MER 2 ur oliz 320 L 8 Aa 152 t 5 ty Av130 LOHS 3NO Sts DNE 29
31. 5 35 10 10 TAGpp 10 35 20 20 TAGOO 47 35 10 10 02 481 0010 B B2701 071 1B 82701 071 28 ARP MFG NUMBER C 8000 005 7400 C 8000 005 7402 C 8000 005 7403 C 8000 005 7473 C 8000 005 7474 C 8000 005 74150 C 8000 005 74174 C 8000 005 7242 DESCRIPTION I C OP TRANS RCA CA3080 OP AMP NSC SL 19988 I C HEX INVERTER O C COLL I C QUAD 2 1 NAND GATE O C COLL PROGRAMMABLE R O M PROGRAMMABLE R O M BLUE I C PROGRAMMABLE R O M VIOLET TSTR SI NPN TSTR SI NPN TSTR SI PNP DIODE SI SIGNAL POT TRIM 100 OHM POT TRIM 50K ENCAPSULATED MODULE V C F CAP POLY 047uf 10 100V CAP CER 0022uf 10 50V CAP TANT 47uf 10 35V CAP TANT 10uf 2096 35V CAP POLY 22uf 200V 1096 SOCKET 16 PIN DESCRIPTION AMP LM301AN DUAL LM1458 TSTR ARRAY NPN PROGRAMMABLE R O M GRAY TSTR SI NPN TSTR SI PNP DIODE SI SIGNAL POT ROT 100K LIN CAP TANT tuf 20 35V CAP TANT 1 5uf 10 35V CAP TANT 10uf 20 35V CAP TANT 47uf 1096 35V SWITCH DPDT WHITE PLUG TO PLUG ASSY 16 PIN 9 PLUG TO PLUG ASSY 16 PIN 15 DESCRIPTION I C QUAD 2 1 GATE I C QUAD 2 1 NOR GATE I C QUAD 2 1 GATE O C COLL DUAL J K FLIP FLOP L C DUAL TYPE FLIP FLOP I C DATA SELECTOR HEX D TYPE FLIP FLOP QUAD 2 1 EXCL NOR GATE 63 64 210 24 CR1 C1 J3 04 BOARD REFERENCE 73 21 2 51 15 17 516 FORZ3 FORZ1 2 P5
32. 8 TOA panoh Nr TAI OD 26 1 gt 39 9P9 T 331nd 463438 32504 Amo sroves andy tt TIN noL 97 THE 7 DIL g ow UA be 249 Hild 0 3 2 9 9 e 9 5 Ube b Ob V ais 59990 7 oiy gt NIS NC v thy Y pis 91 125230 O D PE 9 S xe Rory v 93 09 2 Ves es vis 45 7 329N 4 38438 0028 0208 9 x 53 Yi H24 ld vas wows 1239 PD O e 3 17 2 6 Sild MOT 07 m im 2S EM DT Eee n uil T EE S ma 9 4 O E E EEE T T 5 LO 2701 BOARD D LAYOUT sz ep 4 SION 13S 9966 NS 2896 75 mE Lo md Iz 51 BOARD E LAYOUT 340 ry FY ul I Ag 10 5 DIWWYAD 9 40 215 25 GOI Axoa3 won 13 1 mo 170351 218 48 A ZS HIMA NOOUVD 01535 Dy i
33. 8 04 BALON 5 5 SSSINN NI SBNIVA DOLD TY 2 CORNAS BAI Ad SHIO SEBANA SWHO NI SANA OILS TY l 1 309 7777774 UA jo LLiWy 0d BION 40 H 325 NANY 2 v Y DWALI 2 6 26654 244 van 684 896 ANY 627 026 2 SH381AQN 5 YAQNN 030 613 0 BOARD G II SCHEMATIC REVISED 115 1012 v U EYIL IS LUD 2 s Sry NI ol Juv amp 307v MOLDED 13v Gru 9u wA X 3 ZU 30 SINIYA 3nd Wy BSIMWSHLO 99 I gos DOLENZ ISILON 41 Oru 4 99 AS Nu9 S QNO 8 594091 Qu AS va D 4 ol HDLIMS YIMOd 60 61 BOARD G LAYOUT REVISED gt ed AO 0 0 Y v lt UY S307 Y NI AWA S3w Ww QAI ASIMBBRLO 55 2
34. A2701 057 1 2701 057 1 IN4148 2701 057 18 2 5460 2 5172 2 6076 2N4870 APL4027 008 TAGOO 10 35 50 20 TAGOO 22 16 20 20 TAGOO 3 3 20 10 10 225P22492XD3 U201R 101B 020181038 8 2801 006 30 B 2801 006 2D B 2801 006 1D B 2801 006 4D B2701 071 1B B2701 071 2B 02 481 0001 ARP MFG NUMBER A 2801 009 C 8000 005 7400 C 8000 005 7403 A2701 057 2 A2701 057 3 A2701 057 4 2 81 2 5172 2N6076 4148 225P10491WD3 TAGOO 1 35 10 10 TAGOO 3 3 35 10 10 16 511 10 14 511 10 DESCRIPTION I C HEX INVERTER O C COLL CERMET RESISTOR PACK OPERATIONAL LM301AN I C TRIPLE 3 1 GATE O C COLL I C QUAD 2 1 GATE O C COLL QUAD 2 1 NAND GATE ONE SHOT MULTIVIBRATOR I C DUAL TYPE J K FLIP 4 BINARY COUNTER I C 4 WIDE 2 1 INVERT GATE I C DUAL NSC SL19988 TRIPLE 3 GATE I C QUAD 2 1 NOR GATE I C CERMET RESISTOR PACK PROGRAMABLE R O M DIODE SIGNAL TZ 81 TSTR FIELD EFFECT P CHANNEL TSTR SI NPN TSTR SI PNP TSTR SI UNI JUNCTION TSTR ASSY NPN PNP CAP TANT 10uf 35V 450 2096 CAP TANT 22uf 16V 2096 CAP TANT 3 3uf 20V 1096 CAP POLY 22uf 200V 1096 TRIM POT 100 OHM TRIM POT 10K POT SLIDE 100K LIN POT SLIDE 100K LOG POT SLIDE 1M LOG POT SLIDE 1K LIN PLUG TO PLUG ASSY 26 PIN 9 PLUG TO PLUG ASSY 16 PIN 15 SWITCH ROCKER DPTT DESCRIPTION I C OP AMP NSC 19986
35. ARD B 1 011110 0 1 1 1 1 1 1 1 010 001 01 1 O 1 1110000 9 LOGIC 1 ENABLE ATTENUATOR 0000 11323 1232311 100 1 00 1 0010 1011111 7 LOGIC 1 SELECT ADSR S R B 1011 1 1 1 1 1 1 1 1 0 0 1 1 1 0 0 1 1 1 111 1 1 1 1 1 1 6 LOGIC 1 SELECT ADSR S R A 1 1 0 1 1 0 1 0 O O 0 1 001 1 1 011011 1 0 1 0 0 O 1 _5 1 SELECT ADSR RELEASE 101 1 0 01 0 0 0 0 0 1 0 0 1 1 1 1 11101 11100 01 4 1 SELECT ADSR RELEASE 1011 0001010 00 11111 11001110 1 001 LOGIC 1 SELECT ADSR RELEASE 0001 1 1 1 1 1 1 1 1 0 0 1 0 0 0 0 1 0 0 0 1 1 1101 1 1 2 LOGIC 1 SELECT ADSR SUSTAIN B 0011 1 0 1 0 01 0 1 0 0 1 0 O O 0 0 1 1 0 0 O0 1 1 1 1 0 1 1 1 SELECT ADSR SUSTAIN r BOARD B Z2 SELECT ADSR DECAY B 0000 0 ojo o o ojo o o 1 1 1 o ojo 1 o 1000110001 9 LOGIC 1 0010 0010000j0001j0100j0101j1111j0001 7 LOGIC 1 SELECT ADSR 1100 1 0 1 0 1 1 1 0 0 0 0 1 0 1 0 0 1 0 0 0 1 0 0 0 0 0 6 LOGIC 1 SELECT ADSR ATTACK C 1 1 0 1 1 O 1 0 0 1 1 0 O 0 0 1 0 1 0 0 O0 0 0 100 011 0 5 1 SELECT ADSR ATTACK 1 1 1 1 0 0 0 0 0 0 1 0 0 0 1 1 1 1 1 1 0 0 0 0 0 11 000 4 1 SELECT ADSR ATTACK A 0000 0 0 0 1 1 0 0 0 0 1 0 1 O0 0 1 1 0 0 1 0 0 01 0 1 1 3 LOGIC 1 SELECT AR RELEASE A 1000 1 0 1 1 1 1 1 1 1 0 1 1 1 0 1 1 1 1 0 1 0 00 1 10 2 LOGIC 1 SELECT AR ATTACK
36. CONTINUED ON NEXT PAGE 2 Make a list of a the defective voices is in the suspected circuit Caution The R O M 3 Consult the Voice Flow charts in this manual is often falsely accused of being defective the to determine the circuit which is common only failure rate of the R O M s is actually very low to the voices listed above Example Oboe Electric Bass and Electric 4 Consult the schematics Voice Flow chart Piano are dead Violin and Cello are not cor test points and the R O M truth tables to de rect Conclusion defective resonator bank 3 termine the code outputs of the R O M which board C change Z2B 5 Tuning and Calibrations REF TRIMMER TRIM PROCEDURE BOARD A R37 VCF TRACK R29 SET B TOUCH SENSITIVITY R24 TUNE Pin low C on the keyboard 2 Moniter TP 1 J2 4 with a digital voltmeter Adjust trimmer R37 for exactly zero volts Pin low C on the keyboard Turn ON the VIOLIN voice switch Put the vibrato switch DOWN Adjust trimmer R24 TUNE so that the Pro Soloist is tuned to low C on an organ or strobe tuner 5 Pin the B1 key on the keyboard 6 Adjust trimmer R29 so that the output of the Pro Solist is tuned to B on the organ or strobe tuner Aa 1 Turn ON the TRUMPET and PITCH BEND switches 2 Put the TOUCH SENSITIVITY slider on the front panel in the MIDPOSITION 3 Adjust trimmer R49 for the amount of pitch bend desired by the cu
37. EMATICS FOR BOARDS A B amp C FOR THE LO CATIONS OF THE TEST POINTS P3sese ON CGY DAMM WD v S rosa SAME AS rP 2 EXCEPT v e a O mamme CELLO 2 BOARD A WAVEFORM GENERATOR BOARD PULSE pyn SAWTOOTH OUTPUT Poise OUTPUT PULSE AMPLIFIER SAW PULSE MIXER HPF 9 9 2 63 HIGH PASS FILTER VIO 1 CELLO 3 RESONATOR BANK 3 5 RESONATORS cee Q s s s n lt s 0 8 VCF VOLTAGE CONTROLLED ADSR FILTER LOW PASS ENVELOPE GENERATOR AR 5 l l dd VOLTAGE CONTROLLED GENERATOR AMPLIFIER BOARD B z ARI 21 VOICE CODE 1 1 1 1 2701 BOARD TEST POINTS RE FER TO THE SCHEMATICS FOR BOARDS A B amp C FOR THE LO CATIONS OF THE TEST POINTS 24 s s a s s lt DD s s m r m s m gt s c s s lt s n s s s n n aam 2701 VOICE FLOW CHART s lt s w s lt BOARD C CELLO 2 BOARD A WAVEFORM GENERATOR BOARD P
38. L 1 83003 A35 3 V4 LN3u3adla 2701 BOARD A BLOCK 9 Q8 3 48 WOU 3 41 2701 BOARD C BLOCK DIAGRAM ae UoI uny 259 4 320 s239 32v 2160 SFP j sandu D smossy FION AVS 2929 0470 4993 gt 0 2 82 Z 20199022 2 OA l 8 Z y 9 4903 2 191A 12 gt Jo 2 90 9 GE jo 203000522 2 w 3 0 993 5598 214397935 S 92 Lo lt M 4 GALE 45 16093 O 9122 yo usop 4544603 Lo 4903 2129325913 h 92 82 O AIA 3914993 G 82 WA 219073 82 y O 2 9A O 2 91272 233 VO 92 azz atz YOLVNOS Y WOIVNOS IY YAUN IOSIA 3120 3 4 on Us owt mew ne 6 92 37 lt h LZ JO Jo 2 gt 2 Lf N NIN 9 YO 8 2 2 lou J O 049492 bell O MPS S L2 LO 8 5i d 24849 IWAMA NL Al LC O YO 1 02 08 LNO2 SNWNOS3 eUlNHo2 LNS2 92 4 v 831314 331313 O d311991N0 5 55974 3 3end 1 d d TEE BOWLIOA 5 3 00 HS H
39. PRO SOLOIST MODEL 2701 PRO DGX MODEL 2720 TABLE OF 5 Lc RAO __ ea wer 4 2 2 Theory Ol GS u uu Z t Ho eg 2 3 General ace au Rote a OE ed E 3 4 Trouble Shooting Procedure sa e dea Re SU RR 3 5 Tuning and Calibrations 4 E fre a LE Sd 4 DO FCU DIDESCHBEIDDSE ee nS AUR D EE Ss TIL 8 O Sas 10 9 Interconnection Diagram ss us NO OA 40 10 Block Diagrams Board amp 41 43 11 Schematics amp Layouts Boards amp 44 61 b ty uay EOE TAGS 62 INFORMATION CONTAINED HEREIN IS CONFIDENTIAL AND PROPRIETARY TO ARP INSTRUMENTS INC IT IS DISCLOSED TO YOU SOLELY FOR PURPOSES OF INSTRUCTION AS TO OPERATION OF THE EQUIPMENT AND MAINTENANCE AS APPROPRIATE IT IS NOT TO BE USED BY YOU FOR ANY OTHER PURPOSE NOR IS IT TO BE DISCLOSED TO OTHERS WITHOUT THE EXPRESS PERMISSION OF ARP INSTRUMENTS INC ARP INSTRUMENTS INC 45 Hartwell Avenue Lexington MA 02173 617 861 6000 Document No 9001801
40. ULSE OUTPUT SAWTOOTH OUTPUT PULSE AMPLIFIER SAW PULSE HPF HIGH PASS FILTER CELLO 3 OBOE RESONATOR BANK 3 5 RESONATORS VCF VOLTAGE CONTROLLED FILTER LOW PASS ADSR ENVELOPE GENERATOR AR 9 VOLTAGE CONTROLLED AMPLIFIER ENVELOPE GENERATOR s s lt s ss BOARD B F _ ee SHE qn u yu VOICE FUZZ GUIT I D E VOICE CODE 0l1 111 l 2701 VOICE FLOW CHART VOICE FUZZ GUIT 11 2701 BOARD TEST POINTS RE FER TO THE SCHEMATICS FOR BOARDS A B amp C FOR THE LO CATIONS OF THE TEST POINTS BOARD A WAVEFORM GENERATOR BOARD SAME 45 FOZZ PULSE pv SAWTOOTH OUTPUT m lt G s s s r w s w lt m oe n n e PULSE AMPLIFIER SAW PULSE MIXER HPF 727 T 3 HIGH 55 FILTER RESONATOR BANK 3 5 RESONATORS VCF VOLTAGE CONTROLLED FILTER LOW PASS ADSR ENVELOPE GENERATOR AR ENVELOPE l I VOLTAGE CONTROLLED GENERATOR AMPLIFIER zu IEEE ata 25 D
41. e power supply may be the result of shorts or other problems on other boards in the Pro Soloist If there is any doubt about the power supply being defective remove P1 from board C and clip on set of dummy loads as follows 15V to ground 270 ohm 1 Watt 15 V to ground 330 ohm 1 Watt 5 V to ground 5 ohm 10 Watt Observe the following color coding of power supply wires 15V Red 15V Violet b V Orange Ground Black 2701 R O M TRUTH TABLES lt ul z total HL p ume 2 2 2010 5 o 2 G Des aoln u gt IG 2 lt m N J J lt Q NZ 1 N 2 FS 2 02 25 4 oS 0 BOARD A 215 ENABLE DOWN 2 OCTAVES 1l0 0 0 olo 0 0 0 0 0 0000 9 1 SELECT DYNAMIC PULSE 1 11 0 0100 7 LOGIC 1 SELECT 1 14 PULSE 1 olo o o ojo o o o o 0 o 0 1000 6 LOGIC 1 SELECT 1 9 PULSE o olo o o ojo o 0 ojo o o 0 0100 5 1 SELECT 1 64 PULSE 1 0 00 1 0011 4 1 SELECT 1 2 PULSE 001100 0000 000 0 0100 3 LOGIC 1 SELECT 2 11 PULSE 11100 1 11010 1 0 10 1 1001 2 LOGIC 1 ENABLE DOWN 1 OCTAVE 1 0 100 110 0 01 0 lo100 1 s O A fF r r BO
42. e volts per octave trimmers in the standard ARP synthesizers except that it only affects the interval between C and B on the keyboard rather than from low C to high C The voltage from the D to A converter is fed through a differential amplifier to the voltage controlled oscillator circuitry Here the control voltage now 1 V OCT is supplied to a linear voltage to exponential current converter O3 and O4 O4 determines the charging time on capacitor C7 C7 and O5 are a uni junction oscillator operating at about seven or eight octaves higher than the pitch that is heard on the output of the Pro Soloist Q6 makes the sawtooth from Q5 compatible with TTL circuitry and supplies it to the frequency to voltage converter Z3 and half of Z1 are divide by two chips which are enabled by the two bit octave code from board E Depending in whichoctave a key is being depressed none one two or three of these dividers are enabled to supply Z22 one shot with a pulse wave which is either at the same frequency as the oscillator or one two or three octaves lower Since the pulse width on the output of the one shot is constant the repetition rate fre quency of the pulses is integrated to provide an off set voltage to the differential amplifier thus provid ing the octave control over the oscillator 4 octaves Theoutput of the differential amplifier will have a large AC component which is filtered by C4 and 05 to yield a DC control voltage 1V OCT
43. gnal is stopped B grounds out the signal A LOGIC 0 0 VOLTS It is necessary in some circuits to add externally a pull up resistor 22K typical from the 5 volt power supply to the output of an open collector type gate so that the logic level can be identified with a DVM or oscilloscope Always verify the logic state of these chips in this manner before assuming the device is defective 4 Trouble Shooting Procedure INSTRUMENT DEAD When the Pro Soloist is to tally dead the following should be checked 1 Power supply Check the 15 volt 15 volt and 5 volt outputs If the power supply board G is malfunctioning re move the power connector from board C and connect the supply to a dummy load while trouble shooting see the power supply section for dummy load values 2 VCA signals in the Pro Soloist are routed through the VCA therefore the output of the VCA should be checked while a key is depressed If there is no signal check the output of the If there is still no signal check the sawtooth and pulse outputs of board A VOICES MISSING INCORRECT OR DEAD When some of the voices are correct and some incorrect the defective circuit common to the incorrect voices must be identified Proceed as follows 1 Check the voice code output of board F This code addresses ALL of the Read Only Memory chips in the Pro Soloist See the board F circuit description section for the voice code truth table
44. ns 9 10 and 11 are the squelch cir cuit which provides a momentary pulse to the VCA control input to turn it off to prevent transients from being heard when a voice switch is turned on 6 3 Board C Circuit Description Board C contains a voltage controlled filter VCF a voltage controlled amplifier VCA four high pass filters HPF and ten band pass filters arranged in one of three banks R O M s Z6 Z7 and Z8 determine the signal paths through each of these filters and determines the settings for the VCF The sawtooth waveform supplied from board A is processed through the Sawtooth Pulse Mixer and is routed through one or more of the High Pass Filters The output of the HPF is routed through the VCF and the to the output of the Pro Soloist The pulse waveform from the pulse amplifier can take either of two paths through the Sawtooth Pulse mixer or through the resonator banks Resonator banks 1 2 and 3 are supplied with the pulse wave form only R O M Z8 determines which if any of the resonators in each bank are enabled The output of Resonator Bank 1 and 2 may routed only to the input of the VCA The output of Resonator Bank 3 may be routed to the input of either the VCF or the again determined by R O M Z8 The VCF Tracking circuit determines whether the VCF will track at one volt per octave 2 volts per octave 5 volts per octave or not at all The Res onance circuit determines the amount of feedback
45. on 2 4 The output of the voltage controlled oscillator is also supplied to the Programmable Octave Dividers Depending on the voice selected R O M 215 will in struct half of Z1 and Z8 to either send the signal through the circuit or divide it either once twice or three times down 1 2 or 3 octaves The manual Octave dividers divide the signal even lower depending on the position of the Transpose switch The signal then enters the Six Stage Frequency divider circuit whose output is processed in the Saw tooth Sum circuit Each of the divisions is weighted and summed to produce a 10 volt sawtooth made of 64 small steps CIRCUIT DESCRIPTIONS SECTION 6 The Pulse Generator circuit monitors the outputs of the six stage dividers to develop the following pulse widths 1 14 1 9 1 64 and 2 11 Additionally the Dynamic Pulse Converter circuit develops a variable dynamic width pulse wave All of the pulse waves are supplied to the Pulse Selection circuit where one is selected by R O M 215 and routed to the pulse output 6 2 Board B Circuit Description Board B is the Envelope Generator Board Z1 Z2 and Z3 R O M s program the attack time decay time sustain level and release time of the ADSR envelope generator and the attack and release times of the AR envelope generator ADSR The output of the attack R S flip flop Z4 pin 3 changes from logic 1 to logic O when a gate and trigger are supplied from the keyboard electronics
46. rmined by the R O M s Board E keyboard electronics sends a 6 bit 6 line code to board A to control the pitch of the oscillator Board E also supplies the envelope generators on board B with a gate and trigger Board the Voice Selection board generates a 5 bit code which addresses all of the R O M s eight total which in turn program the signal paths and filter settings The Special Effects board D generates the touch sensor effects vibrato growl wow volume brilliance and pitch bend PITCH BEND VIBRATO WAVEFORM GENERATOR PULSE KEY amp OCTAVE CODE 6 LINES BOARD E KEYBOARD ELECTRONICS BOARDD SPECIAL EFFECTS BOARD A BOARD F VOICE SELECTION TRIGGER TREMOLO WOW BRILLIANCE VOLUME BOARDC FILTER BOARD VCF VCA AND FILTER BANKS ENVELOPE TO VCA ENVELOPE TO VCF BOARD B ENVELOPE GENERATORS AR amp ADSR PRO SOLOIST BLOCK DIAGRAM 3 General Information The digital circuits in the Pro Soloist employ open collector TTL devices This means that a logic 1 is an open circuit and a logic O is ground The voltage level on the output of this type of gate does not necessarily relate to the logic level Illustrated below are two uses for the open collector type gates which will be found in the Pro Soloist C IN A B 5 V A B LOGIC 1 Signal passes A LOGIC 1 5 VOLTS from A to C B is open B LOGIC 0 Si
47. s gt gt ETYM VCF VOLTAGE CONTROLLED FILTER LOW PASS ADSR ENVELOPE GENERATOR AR 8 VOLTAGE CONTROLLED AMPLIFIER ENVELOPE GENERATOR BOARD B gt s Ao w lt _ am s n w q s q s eee eee ss ama _ q s L 38 2701 BOARD TEST POINTS RE FER TO THE SCHEMATICS FOR BOARDS A B amp C FOR THE LO CATIONS OF THE TEST POINTS BOARD A WAVEFORM GENERATOR BOARD PULSE OUTPUT OUTPUT PULSE AMPLIFIER CELLO 3 E BASS OBOE RESONATOR BANK 3 5 RESONATORS VCF VOLTAGE CONTROLLED FILTER LOW PASS VOLTAGE CONTROLLED AMPLIFIER am DO C r l L ap como s s O r olololol4 2701 0 FLOW CHART VOICE Buzz Bassoon SAWTOOTH s r au saw lt wa W ga s t a n lt m m t s s 62 6 2 lt S 3 O 7wvevtioQ v Q9 ons Q LOOD aote WA ADA OL Nea 4 MN e d fg cC oi ei
48. stomer on a firm key depression usually maximum 1 This control is used to tune the Pro Soloist to the same frequency as other instruments it is being used with It is adjustable from the front for the customer BOARD C TRIM PROCEDURE R20 VCF OFFSET Turn ON the FLUTE voice switch CALIBRATE 2 Put the BRILLIANCE slider on the front panel MIDPOSITION Adjust R20 for the best flute sound possible R45 VCF CONTROL 1 Turn ON the HARPSICHORD voice switch REJECT VCA CONTROL 2 Adjust trimmer R45 for minimum thump on key depression turn amplifier up 1 Adjust trimmer R45 see above 2 Turn ON the HARPSICHORD voice switch Adjust trimmer R54 for minimum thump on key depression turn amplifier up 2701 BOARD LOCATIONS 6 1 Board A circuit Description The 4 bit key code from board E is converted to an analog control voltage in the D to A converter Although the 2 bit octave code is also fed to the D to A converter it serves as a correction voltage the octave control over the voltage controlled oscillator is in the Frequency to Voltage converter circuit The output of the D to A converter is 5 volts when any C key is depressed When any key is depressed _ the D to A output increases to about 45 3 volts The highest voltage produced by the D to A converter is 9 volts when any B key is depressed Trimmer R29 set B trimmer sets the interval between each key and is equivalentto th
49. t 3u uamuul oruli ruojloumoiuouoc uoirvozsoliazorinomo BOARD C Z6 PIN LOGIC 1 SELECT MAX FILTER RES LOGIC 1 SELECT MED FILTER RES LOGIC 1 SELECT NO FILTER RES ENABLE NO TRACK ENABLE TRACK 5 V OCT LOGIC O ENABLE TRACK 2V OCT LOGIC 0 ENABLE FILTER OFFSET B LOGIC 0 ENABLE FILTER OFFSET A O IO O Q O ooo 2 OQO IO O O O O O O ojlo O O o O O jea O j 00 mje a 6 l 2 O Q oj nn O O 00 000 O O 00 27 LOGIC ENABLE E HORN amp NO 2 RES LOGIC 1 ENABLE PULSE 10 dB LOGIC 1 ROUTE PULSE TO HPF INPUT LOGIC 1 ROUTE SAWTOOTH TO HPF LOGIC 1 ENABLE HPF D LOGIC 1 ENABLE HPF C LOGIC 1 ENABLE HPF B LOGIC 1 ENABLE HPF A 9 7 6 5 4 3 2
50. y 30990 8 182 v 14 vulva qt 6 od do Mp o 5 6 53 Lavan 203 ZZA oNV id 3 BOARD 1 SCHEMATIC 4 55 2212371 1 Lis S OTIC 43 SAHOO L coe 5 4 30 Ni 72 TUE Bev Vw IDBVAS 3 6 Ni 30 83063 v 015193 qA 0 Q34 AOS AGIAWEHLO 00 5 ain NINOIA 9 7 a e WWLIND 33319 OANIAD 0 8 3 vara wan sand ST mes jue ep sva saos vena rive saan seve ovas No sws sawya oio esa wies was annur awa sun mom s ssesacsr ven 3 sowa SSS C Me e 5666 aa 1 weessvs hibike ev ov SA 29 331 721WO02 Nuon HON add wv S a 1AN O9 wow 19005 LO TAG BOCA 1 DNOS ALN 4 3 060 TION XY NUOH n 115N3 NOOSSYA 7Z 8 NOOSS YQ e iu 5 LIS 1 a MBIA 3Y ed 28 YY H

Pro Soloist Service Manual

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