>Do I recall a few months back, someone had a problem with their Juno not >plaaying every 6th note? Something to do with the DCO dying a death? > >Well guess what... :( Bummer! > >All advice as to how to deal with this problem (i.e. how to fix it - I'll >contact a proper dealer but I intend fixing it myself, I mean, I'm an >electrical engineer anyway, and I can't afford to pay someone 30 quid to >do some soldering)... is welcomed. Oh yeah, how much am I looking at >spending? I had a similar problem a while back. Problem was - it wasn't the VCO that was dodgy, but the VCF hybrid. If you put the Juno into test mode, it is easy enough to find out which voice is gone. Here's some stuff I put together for Analogue Heaven a while back : (Oh, and BTW, the VCF Hybrids are about 25 quid from Roland in Swansea.

============================================================================== | SWITCH | FUNCTION DURING TEST MODE | ============================================================================== | KEY | POLY 1 | UNISON: All six modules are assigned simultaneously | | ASSIGNMENT | | to a key being pressed. | | |--------|------------------------------------------------------| | | POLY 2 | NON The voices are assigned to the keys played | | | | ROTARY: in the order of CH1 to CH6 as long as the | | | | previous keys are held down. | | | | One-key staccato always sounds CH1 only. | | | | | | | | The display window indicates current channel number. | | |--------|------------------------------------------------------| | | POLY 1 | ROTARY: The voices are assigned in a cyclic manner; | | | & | 7th key steals the voice from the 1st key. | | | POLY 2 | | | | | | | | | The display window indicates current channel number. | ============================================================================== | BANK | GROUP A| HOLD OFF | | GROUP | GROUP B| HOLD ON | ============================================================================== | TAPE | SAVE | MIDI FUNCTION II CHECK | | CHECK LED | VERIFY | MIDI FUNCTION I CHECK | ============================================================================== | MIDI CH | | Turns D/A output to 0V | ============================================================================== Pressing BANK buttons also evokes Test Program and sets the front panel controls as below. PATCH buttons have no effect in the test mode. ============================================================================= |B| TEST |LFO| DCO |H| VCF |VCA| ENV |C| |A| FUNCTION |---|-------------------|P|---------------|---|------------|H| |N| |R|D|R|S |S |S |N |L|P|P|F|F |R |E|E|L|K |~|L|A|D |S |R |O| |K| |A|E|A|Q |A |U |O |F|W|W| |R |E |N|N|F|Y |/|E| | | | |R| | | |T|L|N|U |W |B |I |O|M|M| |E |S |V|V|O|B |S|V| | | | |U| |N| |E|A|G|A | | |S | | | | |Q |O | | | |D | |E| | | | |S| |O| | |Y|E|R | | |E | | |M| | | | |P| | | |L| | | | | | |.| | | | |E | | | | | |O| | | | |O| | | | | | | | | | | | | | | | | | | | | |D| | | | |L| | | | | | | | | | | | | | | | | | | | | |E| | | | |A| | | | | | | | | | |-|------------|-|-|-|--|--|--|--|-|-|-|-|---|--|-|-|-|--|-|-|-|---|--|---|-| |1| VCA OFFSET |5|0|8| | | 0| 0|0|0|M|1|10 | 0|0|N|0|10|~|5|0| 0|10| 0|0| |2| SUB OSC |5|0|8| | |10| 0|0|0|M|1|10 | 0|0|N|0|10|~|5|0| 0|10| 0|0| |3| VCA/CF GAIN|5|0|8| | | 0| 0|0|0|M|1|6.3|10|0|N|0|10|~|5|0| 0|10| 0|0| |4| RAMP WAVE |5|0|8| |ON| 0| 0|0|0|M|1|10 | 0|0|N|0|10|~|5|0| 0|10| 0|0| |5| PWM 50% |5|0|8|ON| | 0| 0|0|0|M|1|10 | 0|0|N|0|10|~|5|0| 0|10| 0|0| |6| NOISE LEVEL|5|0|8| | | 0|10|0|0|M|1|10 | 0|0|N|0|10|~|5|0| 0|10| 0|0| |7| VCF HI/LO |5|0|8| | | 0| 0|0|0|M|1|10 | 0|0|N|0|10|~|5|0| 0|10| 0|0| |8| RE-TRIGGER |5|0|8|ON| | 0| 0|0|0|M|1|10 | 0|0|N|0|10|~|5|0|1.3| 0|1.3|0| ============================================================================= Edit functions are also active in test mode; when an edit is made, display window lights a dot. To return