Service Manual incl. manual changes/improvements
Contents
1. GN 008 OF 06 E aep S em cis c NI 50 4506 4204 c E wu o N N EN Rut E R15 821749927 SLOPE CU UOS Z2629HvZ NEPTUNE CC 1998 by Spectral Audio pu JO3 STIFTENLEISTE 18POL LM340T 05 5 Adjustment Keep the following sequence 5 1 Adjustment of 12 000 V Supply Connect a precise DVM to C12 and Ground i e from a potentiometer mounting pin and adjust R19 to 12 000V after a warm up phase of at least 30 minutes 5 2 CV slope adjustment Connect a precise DVM to the output jack of CV Adjust R15 to 3 00V between C1 C4 input over MIDI 5 3 1 The offset for VCO1 is set with ROO3 and the oscillator slope with ROO8 Nonlinearity in the upper frequency range 15 adjusted with RO14 Proceed as follows to make the adjustment 1 Set the MIDI reference note to C1 by pressing the learn key 2 Press key A3 and set the VCO1 frequency with offset trimmer to 220 0 Hz measured with an exactly frequency meter 3 Press key A1 and set the frequency to 55 0 Hz with oscillator slope trimmer 4 Repeat steps 2 and 3 until frequency values are stable 5 Press the key A5 and set the frequency to 880 0 Hz with nonlinearity trimmer 6 Repeat steps 2 to 5 and re adjust if necessary Page 6 5 4 Osc2 Same as above but with R020 as offset RO26 as oscillator slope and RO39 as nonl2. please write to spectralaudio swissonline ch 2 Manual Changes 2 1 Having pulse width modulation PWM for the rectangular wave on OSC1 0SC3 2 1 1 OSC1 remove UO1 pin 13 from Ground it s connected on both side of pcb so you have to heat up the pin with the solder gun and pull the pin out 2 1 2 OSC2 remove U11 pin 9 from Ground it s connected on both side of pcb so you have to heat up the pin with the solder gun and pull the pin out 2 1 3 OSC3 remove U12 pin 9 from Gound here it s more easy just on bottom side you have to cut the connection to the Via The free pin is now the input of a DC voltage in the range to have pwm 0 50 2 2 OSC3 LFO sync with OSC1 or OSC2 For this connect 470pF to Base middle pin of OSC2 or T01 OSC1 2 3 Even faster envelopes To increase even more speed of EG1 Volume you may solder a resistor in the value of 100 Ohm down to 10 Ohm parallel to R118 For the VCF Envelope use R100 Both may be result in some click noise because of the low rise and decrease time of the Envelope 2 4 Increase the tuning range for OSC1 0SC3 It is possible to reduce the value of R001 for OSC1 R022 for OSC2 and R128 for OSC3 Its standard value is 1M5 Decreasing its value may also mean to decrease of R002 R021 and R129 to have the reference note in the middle of the Tune Pot To learn another Reference Note over MIDI is another solution but this decreases the note range 2 5 Genera
3. Neptune FILTER iG e SUB 052 LFO misync e Q7 Power 1 vco 2 e GATE vot vco LEARN rd MIXER LEARN ANALOG SYNTHESIZER MODULATION oH TARGETS Ne o RING MOD 4587 vco 2 V ATTACK FUZZER ATTACK DECAY SUSTAIN RELEASE DISTORTION VOL ENV 567 67 aS e gt SUSTAIN RELEASE ENV MOD SPECTRAL AUDIO Service Manual gt SEU yo Spectral AUO Contents 1 General E 2 Manivial Gang 0S MP 2 1 Having pulse width modulation PWM for the rectangular wave on OSC1 OSC3 sese 2 2 0SC3 LEO syne with OSG1 Or OS G2 2 cho aee areae te i dre pete 2 3 Even faster envelopes t ire i testi reete eleg Pee ERE SERERE ETUR rg eeu arise ba ve ea ede v Pe ero eee dh e ede eddy 2 4 Increase the tuning range for 1 0 3 2 9 General in OuUtputs RR 3 Assembly plan Analogue Print iet tied ord ee dn oie inm ded 4 Assembly plan Digital er e Eod SE Cini Mathie 5 1 Adjusmmentof 12 000 V Supply irre Page 2 1 General Note Fully schematic is not supported by this manual If you think you really need to receive it
4. inearity correction Do it first with Oct switch in 16 pos and correct later the Nonlinearity pot with Oct switch in the highest position until no beats are hear able to Osc 1 5 5 Osc3 Same as above but with R127 as offset R132 as oscillator slope and R142 as Nonlinearity correction Do it first with Oct switch in 32 pos Now all frequencies are half the value of the above Correct later the Nonlinearity pot with Oct switch in the highest position until no beats are hear able to Osc 1 5 6 Filter Put it in self resonation start of Set key follow switch to 100 Measure the generated frequency and set Cut off pot to 100Hz with C1 at MIDI input Input now C4 at MIDI and adjust R152 to 800 Hz Repeat if necessary Have fun Page 7
5. l in outputs 2 5 1 Oscillators The easiest way to get the signals of the Oscillators are the switches 5 02 5 03 and SW11 Amplitude is to 12V Same for the noise generator 2 5 2 Envelopes These signals can be taken on ENV MOD potentiometer for the filter envelope and on the Volume potentiometer for the VCA envelope 2 5 3 Filter The Filter input is at C18 and its output is 007 pin 8 Control voltage is applied to the Base of T05 and R073 Page 3 2 5 4 Distorter The filter output is directly connected to the distorter fuzzer selection input Remove pin 8 from UO7 from the solder pad leave it in the air and connect R105 to it The remaining pad is now the input for the distorter fuzzer selection Output is at U15 pin 14 2 5 5 VCA Input is R176 sold it away from the output of U15 pin 14 Output is pin 12 from UO6 and at the output jack on the rear side Control voltage can be applied to the volume potentiometer Page 4 uA P CT De BEBE UO ms aR 1 Fa N o N NN 5 WE oe 2 Ful F I a 3 Assembly plan Analogue Print 08 R003 lol o ite o a o ire o v o 0 Y e T M 5 oai 4009
Download Pdf Manuals
Related Search