Tag Archives: issue

Roland SH1000 recapping

Sometime ago i bought Roland’s first ever synthesizer, for about a quarter of what it goes for these days-it was in dire condition, mind you. The control panel rusty and battered, the silkscreen on a couple of spots barely readable.

I always believed mint condition items belong to museums, not being fit for use, abuse and misuse.. i feel the same way about vinyl records-people who wrap them in polypropylene covers from day one and treat them as if they’re going to break anyday soon.. good grief

I must say that although i truly love the instrument- i also fit the Kenton cv/gate control board a year ago, i rarely ever used it.

The other day i took it out for a spin and the tuning was way off, it was drifting. It wouldnt even span an octave-it was that bad.

Time to recap, i thought, and pulled out the Elnas, the Nichicons and the soldering iron-i figured i’d give a refresh to the power filtering section, part of what the service notes call the “Pulse Sheet Assembly”..

Before
I also upgraded the caps from 35v tolerance to 50v

Just a note: although the unit was in working condition, albeit out of tune, most of the 1uF caps on this board, were off their nominal capacitance-the 2.2 uF cap measuring a whooping 8.5 uF! Of the big 1000 uF caps, two were measuring 1200something uF, whereas the other two were still closer to the 1000 mark-and they all showed low ESR (40+ year old caps!). The three tantalum capacitors on this board were still working great, their value as per specs.

I fired the synth after recapping this board-the sound was a bit more definite, but the tuning was still off.

I decided to check the VCO board, pictured above. But, alas, no electrolytics there to substitute. I checked very carefully the board-and there it was, staring at me:

Polarity is negative at diode soldering onto the board

The diode+resistor combination to the upper far right of the board: the diode was broken in two!

The schematic calls for diode, 1S2473.. i checked a few diodes I had, and landed on a 1N4148 as a fitting substitute!

And.. yes now it IS tuned! The snipped diode was the issue!

Assorted pics of the wiring at the back of the oscillator board

SammichSID Novation Zero SL mkii template

Those geniuses at Novation shipped this controller with a couple of software disks but alas, no TEMPLATE EDITOR for people who dont use a pc to make music.

Download the template editor program from their support pages, connect the Zero SL to your pc via usb, switch it on and fire the software. Press Global options on the SL, choose mem protect off.

Load the syx file provided by yours truly:

Masuto’s SammichSID template 😊

and then.. select

Press Write, and bob’s your uncle.

I saved it in location 20 (empty) and made it the startup template.

To use the drumpads to send cc (mod depth 1,2,3,4,5,6) on the novation zero SL you must first press REVIEW and then use the drumpads-you will see their assigned value increasing because we are using them as step switches.

For your reference, heres a crudely PAINT assembled wildcard:

Happy knob twiddling!