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Spectral Audio ProTone Service Manual

Midi analog synthesizer
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ProTone
MIDI Analog Synthesizer
Service Manual
Copyright © 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 dangerous voltages in the instrument. Spectral Audio
GmbH accepts no liability for personal injury or material damage.
Service Manual ProTone
Page 1 of 20
© 1996-2001 Spectral Audio

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Summary of Contents for Spectral Audio ProTone

  • Page 1 All instructions in this manual must be carried out by a professional who observes the valid safety regulations. In operation, they have got dangerous voltages in the instrument. Spectral Audio GmbH accepts no liability for personal injury or material damage.

  • Page 2: Table Of Contents

    4.2 Sense of C63 – C65 4.3 Sense of R174 and R175 4.4 Hum Problems 4.5 Increasing the Gate voltage to +12V Adjustment of the ProTone 5.1 Digital PCB (MIDI to CV converter) 5.2 Analog PCB (VCO1 and VCO 2) 5.2.1 VCO1 5.2.2...

  • Page 3: Description Of The Operating Elements

    41. Gate input/output (dependent on the jumper setting inside the unit, standard setting: output) 42. CV input / output (dependent on the jumper setting inside the unit, standard setting: output) 43. MIDI Thru socket 44. MIDI IN socket Service Manual ProTone Page 3 of 20 © 1996-2001 Spectral Audio...

  • Page 4: Front Panel Controls

    30. GROUNDLEVEL: Ground level of the unit. This also includes the volume increase influenced by the accent. 31. PAN: Regulates the relationship of the volume from the left and right-hand channel Various: 32. LEARN Key; Switches the ProTone to the learn mode 33. GATE / LEARN indicator 34. Switch-on indicator 35. Main switch...

  • Page 5: Functional Description

    Before the signal leaves the ProTone, it arrives at the VCA (Voltage Controlled Amplifier) which is available in the ProTone in stereo form. Here the input signal is multiplied with a control signal. In this way, the volume can be influenced by a control signal which comes from the envelope generator and the MIDI converter. The volume of the ProTone is controlled with the GROUND LEVEL regulator (30) as well as via the MIDI controller EXT (7).
  • Page 6 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 glossary. Service Manual ProTone Page 6 of 20 © 1996-2001 Spectral Audio...

  • Page 7: History Of Series

    R174, C63-C65 inbuilt; R174 and R175 (NTCs) added (by hand); GND Connection to case This manual describe the last serie. This manual contains no the hole schematics. Spectral Audio may send it to you for important reasons, please write to info@spectralaudio.ch.

  • Page 8: Sense Of R174 And R175

    Apart from this, port 1.3 (pin 4) of the microprocessor must be connected to GND that the gate signal output from the microprocessor is inverted. The circuit change appears as follows: Service Manual ProTone Page 8 of 20 © 1996-2001 Spectral Audio...

  • Page 9: Adjustment Of The Protone

    Proceed as follows to make the adjustment: 8. Set trimmers R131, R156 and R132 to the base settings shown below. 9. Set the ProTone MIDI reference note to C1 by pressing the learn-key if not done yet. Service Manual ProTone Page 9 of 20 ©...
  • Page 10 VCO1 open, too. If so, adjust R132 in that way that no beats are audible. 14. Repeat steps 3 to 6 and re-adjust if necessary. 15. done! Service Manual ProTone Page 10 of 20 © 1996-2001 Spectral Audio...

  • Page 11: Digital Pcb

    6 Digital PCB 6.1 Assembly plan 6.2 Part list Resistors Metal Film Resistor, 1%: 100R 100k 300k Trimmer Service Manual ProTone Page 11 of 20 © 1996-2001 Spectral Audio...
  • Page 12 27C64 Q200 LM 2940CT-12 74HC573 N LM 7805 U10 LM 7912 Various Socket for U6 28 pin assemble with EPROM "ProTone V1.04" QZ1 12 MHz (HC 49) BV 030-7010.0 L Transformer S16 V20212MS02Q C&K DIN 5pol Socket DIN 5pol Socket...

  • Page 13: Analog Pcb

    W1 Plug Ledge 3 pole W2 Plug Ledge 3 pole Jump1 Jumper 2.54 mm assemble on W1 "Out" Jump2 Jumper 2.54 mm assemble on W2 "Out" 7 Analog PCB 7.1 Assembly plan Service Manual ProTone Page 13 of 20 © 1996-2001 Spectral Audio...
  • Page 14 Service Manual ProTone Page 14 of 20 © 1996-2001 Spectral Audio...

  • Page 15: Part List

    7.2 Part list Resistors 100K * 270K * 220K 100K Trimmer 100K 100K 100K 100K Trimmer 300K 100K * Service Manual ProTone Page 15 of 20 © 1996-2001 Spectral Audio...
  • Page 16 300K R100 R101 300K R102 470K R103 R104 R105 R106 R107 R108 R109 R110 R111 R112 R113 220K R114 R115 100K R116 R117 R118 R119 270K * R120 R121 Service Manual ProTone Page 16 of 20 © 1996-2001 Spectral Audio...
  • Page 17 NTC 68k mounted with hot glue on U16 parallel to R86 * must be a Metal Film Resistor, 1% 47K LIN TUNE VCO1 Solder Temp. 235 Grad Celsius max, Service Manual ProTone Page 17 of 20 © 1996-2001 Spectral Audio...
  • Page 18 Foil 2.5 x 7.2 WIMA 2.2u Elko Elko 100p Foil 2.5 x 7.2 WIMA 100n 2.54 3.2 x 5.1 100n 2.54 3.2 x 5.1 100n 2.54 3.2 x 5.1 Service Manual ProTone Page 18 of 20 © 1996-2001 Spectral Audio...
  • Page 19 TL 074 CN CA 3046 TL 074 CN XR 2208 CP LM 13700 N LM13700 N TL 074 CN TL 074 CN LM13700 N LM13700 N U26 CD 4001 BCN Various Service Manual ProTone Page 19 of 20 © 1996-2001 Spectral Audio...

  • Page 20: Mechanical Part List

    1 Inlet IEC Socket with Fuse Box 1 Fuse 250mA 1 Cable blue with thimbles 4.8mm 2 Cable brown with thimbles 4.8mm 1 Cable yellow-green with thimbles 1 Power switch 1 pole with 4.8mm terminals Service Manual ProTone Page 20 of 20 © 1996-2001 Spectral Audio...

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