Spectral Audio ProTone, Service Manual

Page 1: ...yright 1996 2001 by Spectral Audio Switzerland CAUTION All instructions in this manual must be carried out by a professional who observes the valid safety regulations In operation they have got danger...

Page 2: ...ements and explanations 7 4 1 Sense of R174 and R175 7 4 2 Sense of C63 C65 7 4 3 Sense of R174 and R175 8 4 4 Hum Problems 8 4 5 Increasing the Gate voltage to 12V 8 5 Adjustment of the ProTone 9 5 1...

Page 3: ...icht ffnen Avis Risque de choc Electrique ne pas ouvrir SPECTRAL AUDIO GmbH Serial No 1 1 Sockets on the Rear of the Housing 36 Power socket 37 Fuse compartment fuse max 500 mA 250V type 38 Audio outp...

Page 4: ...f VCO 1 9 RINGMOD Volume of the ring modulation of VCO1 and VCO2 10 VOL VCO 2 Volume of VCO 2 VCF 11 CUTOFF Cut off frequency of the filter 12 RESONANCE increases the harmonics at the cut off point 13...

Page 5: ...s remain the same The resonance forms a feedback of the output to the input of the filter and causes an amplification of the frequencies around the cut off frequency The ACCENT regulator 14 sets the s...

Page 6: ...ce Manual ProTone Page 6 of 20 1996 2001 Spectral Audio released The parameters of the envelope can be set with regulators 25 to 28 How the envelope should be imagined is described later on in the glo...

Page 7: ...ectral Audio may send it to you for important reasons please write to info spectralaudio ch 4 Improvements and explanations 4 1 Sense of R174 and R175 These two resistors helps to increase the lower l...

Page 8: ...internal connection from GND to the metal case creates a hum noise because of closed earth loops In this case it may help to cut this internal GND connection You will find it on later Proton s series...

Page 9: ...hapter above The setting of R10 in the MIDI to CV converter is valid for both VCO of course 5 2 1 VCO1 The frequency of the oscillator can be taken from pin 8 of U11 or at the unit output whereby the...

Page 10: ...ncy meter 11 Press key A1 and set the frequency to 55 00 Hz with R156 12 Repeat steps 3 and 4 until frequency values are stable 13 Press the key A5 and set the frequency to 880 0 Hz with R132 Check he...

Page 11: ...Spectral Audio 6 Digital PCB 6 1 Assembly plan 6 2 Part list Resistors Metal Film Resistor 1 R1 220 R2 220 100R R3 220 4k7 R4 1k 24k R5 10k 30k R6 10k 62k R7 1k 91k R8 47k 100k R9 47k 300k R10 2k Tri...

Page 12: ...54 2 x 5 C56 10u Elko 2 d 5 C66 2 2u Elko 2 d 5 C67 2 2u Elko 2 d 5 Semiconductors Q1 TL 431 CLP D1 1N4148 D2 1N4148 D3 1N4148 D4 DF 02 M D13 1N4148 U1 CNY17 3 SFH 601 3 U2 TL 074 CN U3 24C01 02 CB U4...

Page 13: ...e Manual ProTone Page 13 of 20 1996 2001 Spectral Audio W1 Plug Ledge 3 pole W2 Plug Ledge 3 pole Jump1Jumper 2 54 mm assemble on W1 Out Jump2Jumper 2 54 mm assemble on W2 Out 7 Analog PCB 7 1 Assembl...

Page 14: ...Service Manual ProTone Page 14 of 20 1996 2001 Spectral Audio...

Page 15: ...R23 100K R24 100K R25 100K R26 10K R27 15K R28 1K R29 10K Trimmer R30 4K7 R31 10K R32 1M R33 1M R34 300K R35 2K2 R36 390 R37 2K2 R38 470 R39 220 R40 10K R41 1K R42 91K R43 15K R44 10K R45 91K R46 10K...

Page 16: ...9 100K R80 220K R81 5k1 R82 100 R83 1M R84 1M R85 100 R86 5k1 R87 10K R88 10K R89 100K R90 180K R91 470K R92 2M2 R93 470 R94 2M2 R95 220K R96 220K R97 24K R98 300K R99 62K R100 24K R101 300K R102 470K...

Page 17: ...R144 470 R146 15K R147 1K R148 1K R149 4K7 R150 10K R151 24K R152 300K R153 10K R154 47K R155 100 R156 1K Trimmer R157 1K Trimmer R158 30K R159 1K R160 470K R162 470 R163 15K R164 1K R165 1K R166 24K...

Page 18: ...C24 4p7 Ker 2 54 1 8 x 3 5 Philips C25 1u Foil 5 6 x 10 5 EVOX C26 47n Foil 5 2 5 x 7 2 EVOX C27 470p Foil 5 2 5 x 7 2 WIMA C28 470p Foil 5 2 5 x 7 2 WIMA C29 47n Foil 5 2 5 x 7 2 EVOX C30 100n Ker 2...

Page 19: ...Q25 BC 556 B Q26 BC 556 B D7 1N4148 D8 1N4148 D9 1N4148 D10 1N4148 D11 1N4148 D12 1N4148 D14 1N4148 D15 1N4148 D16 1N4148 DL1 2 5 x 5mm Green Assemble with 8 mm spacer Total 17mm DL2 2 5 x 5mm Red As...

Page 20: ...1 EE 1 pole on off Push Push Switch ITT S15 PVA1 OA 1 pole on off Momentary Switch ITT SW1 56P36 01 1 06N 6 pole Rotary Switch Grayhill J12 Connector 18 pole Socket mounted on Solder Side 8 Mechanical...