Hi,
I am currently trying to calibrate my Roland Juno 60, but I am facing the following problems:
Section 5-2 VCA OFFSET: no change when turning VR5 of channels CHx.
Section 7-3 LFO OFFSET: signal oscillates around ground potential, no matter into which direction I turn VR3.
Section 8-7 VCF LFO GAIN: SM says to adjust to 6 Vpp, but truning VR8 allows only for 4.1 Vpp max.
(See attached picture. I think I read about this problem somewhere before, but can't find the respective post anymore.)
Not sure how to attach videos showing oscilloscope readings.
Any hints on how to solve the issues above are highly appreciated. Thanks.
HELP! Roland Juno 60 calibration problems
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cornutt
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Re: HELP! Roland Juno 60 calibration problems
Obvious question first: did you check the power supply voltages? The last problem in particular looks like a power issue.
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Re: HELP! Roland Juno 60 calibration problems
Hi,
yes, I calibrated PSU supply voltages to spec.
Best,
Dan
yes, I calibrated PSU supply voltages to spec.
Best,
Dan
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madtheory
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Re: HELP! Roland Juno 60 calibration problems
What are the issues with the synth? Slightly out of tune? Filter not tracking accurately? Something else?
Are you using an insulated screwdriver for the trimmers? Uninsulated/ metal can cause problems. Do you have a good 0V ref for the measurements? Is it connected to some kind of amplifier? Maybe the scope is causing a grounding issue? What kind of scope is it?
Are you using an insulated screwdriver for the trimmers? Uninsulated/ metal can cause problems. Do you have a good 0V ref for the measurements? Is it connected to some kind of amplifier? Maybe the scope is causing a grounding issue? What kind of scope is it?
Re: HELP! Roland Juno 60 calibration problems
Hi,
I followed the calibration instructions in the SM and all steps went fine except the three ones I mentioned.
I am using an USB scope (Voltcraft DSO 1052, i.e. 50 MHz, 150 MS/s), they synth is connected to an isolation transformer and of course I use special plastic screwdriver build for calibration tasks. There is no particular issue with this synth, just wanted to calibrate it before installing Tubbutec 66 Midi mod. Actually, some settings were out of spec which I corrected during calibration. The synth is not connected to an amp. For CPU board calibration (e.g all related to TP4 like 8-7 VCF LFO Gain)I used the particular ground pin from there.
For calibration tasks related to TP19 (panel board A) i used the PSU heat sink as ground.
Regards,
Dan
I followed the calibration instructions in the SM and all steps went fine except the three ones I mentioned.
I am using an USB scope (Voltcraft DSO 1052, i.e. 50 MHz, 150 MS/s), they synth is connected to an isolation transformer and of course I use special plastic screwdriver build for calibration tasks. There is no particular issue with this synth, just wanted to calibrate it before installing Tubbutec 66 Midi mod. Actually, some settings were out of spec which I corrected during calibration. The synth is not connected to an amp. For CPU board calibration (e.g all related to TP4 like 8-7 VCF LFO Gain)I used the particular ground pin from there.
For calibration tasks related to TP19 (panel board A) i used the PSU heat sink as ground.
Regards,
Dan
Re: HELP! Roland Juno 60 calibration problems
Make sure the scope is set to DC for the issue of oscillating near ground potential. I made that error and hope this might be helpful to you