Roland MKS30
- 2 syncable DCO's with cross modulation for each of 6 voices.
- Velocity sensitivity for amp & filter cutoff.
- Highpass & Lowpass VCF, LFO (sine, square & noise) & 1 ADSR envelope per voice
- 64 patch memory with additional cartridge slot (64 patches per cart).
MKS30 Chip replacement guide
There are six summing resistors used to combine each voice in these synthesizers. In the Roland GR-700 and MKS-30 example, shown above, the resistors bridge across the voice section to the output section.
If you are not sure which voice is causing a problem, you can use a scope to see the VCF/VCA output by touching the left side of each resistor. If you do not have a scope, then attach a wire to chassis ground, and then touch the wire to the left side of each resistor. This will mute the output of the synthesizer voice. When you mute the output of the bad VCF/VCA, the erratic sound should stop.
MKS30 Test mode info by Dougt
As promised -
To put the MKS-30 into test mode, while holding MIDI Ch button press Dynamics button. The display will then show the current voice being played as a long line like this -
, , l , , ,
which would indicate voice 3 is playing.
Oh and you can use the front panel buttons 1 to 8 to play the synth in the mode by holding down MIDI Ch and pressing the 1 thru 8 buttons (1 is C and 8 would be C an octave up).
To put the MKS-30 into test mode, while holding MIDI Ch button press Dynamics button. The display will then show the current voice being played as a long line like this -
, , l , , ,
which would indicate voice 3 is playing.
Oh and you can use the front panel buttons 1 to 8 to play the synth in the mode by holding down MIDI Ch and pressing the 1 thru 8 buttons (1 is C and 8 would be C an octave up).