Search found 18 matches

by Jonathan40
Fri Feb 09, 2018 5:37 pm
Forum: Gear Services & Other Goods
Topic: CS-80 Question: 70 ohm Resistance Between+15V and GND
Replies: 7
Views: 3339

Re: CS-80 Question: 70 ohm Resistance Between+15V and GND

Here are the resistances I'm getting between the power rails on my CS-80 and ground: +15V = 70.3 Ohms -15V = 64.5 Ohms +8.5V = 337 Ohms -6.5V = 878 Ohms +10.6V = 540 Ohms The rails can be accessed on the power supply just behind the output molex connector. The +15V is the brown wire at the top and t...
by Jonathan40
Wed Feb 07, 2018 5:55 pm
Forum: Gear Services & Other Goods
Topic: CS-80 Question: 70 ohm Resistance Between+15V and GND
Replies: 7
Views: 3339

Re: CS-80 Question: 70 ohm Resistance Between+15V and GND

Well, I heard from another CS-80 owner, and he's getting 69 ohms from the +15V rail to Ground. Things are looking up!
by Jonathan40
Tue Jan 30, 2018 1:53 am
Forum: Gear Services & Other Goods
Topic: CS-80 Question: 70 ohm Resistance Between+15V and GND
Replies: 7
Views: 3339

Re: CS-80 Question: 70 ohm Resistance Between+15V and GND

Of course working load and unpowered resistance are two different things so there still could be a problem. Just saying it's not like it's a dead short or something, and at least it makes somewhat reasonable sense. I get 187 ohm on the CS-50 from the ground rail to the +15 rail. Please let us know ...
by Jonathan40
Tue Jan 23, 2018 5:43 pm
Forum: Gear Services & Other Goods
Topic: CS-80 Question: 70 ohm Resistance Between+15V and GND
Replies: 7
Views: 3339

Re: CS-80 Question: 70 ohm Resistance Between+15V and GND

Thanks, Scott. The 500mA fuse blew on the power supply before I did all this testing, and a tech told me to check for shorts between the 15V rail and ground, hence my question. Need to make sure everything's safe before powering this thing up again.
by Jonathan40
Thu Jan 18, 2018 10:31 pm
Forum: Gear Services & Other Goods
Topic: CS-80 Question: 70 ohm Resistance Between+15V and GND
Replies: 7
Views: 3339

CS-80 Question: 70 ohm Resistance Between+15V and GND

With the power off, I'm getting a 70 ohm resistance between ground and the +15V card riser supply rail on a Yamaha CS-80 - does anyone know if this is this normal? Not sure if the decoupling capacitors on the new 4000-series sockets are contributing to this.
by Jonathan40
Sun Feb 21, 2016 8:04 pm
Forum: Gear Services & Other Goods
Topic: Roland sh-101 LFO/CLK RATE problem
Replies: 6
Views: 2622

Re: Roland sh-101 LFO/CLK RATE problem

Cleaning doesn't always help, but worth a shot. If it were me, next step, I would de-solder the slider and test it with a DVM. Think I'll be giving that a try, as the cap and a resistor in the circuit tested out OK. I tried comparing the ohms of the LFO/CLK slider to the other good ones while all w...
by Jonathan40
Fri Feb 19, 2016 4:16 am
Forum: Gear Services & Other Goods
Topic: Roland sh-101 LFO/CLK RATE problem
Replies: 6
Views: 2622

Re: Roland sh-101 LFO/CLK RATE problem

garranimal wrote:Might try cleaning the slider with some contact cleaner.
I tried cleaning the slider with Caig MCL and had no luck. Also did a D/A converter adjustment...back to square one..wondering if it could be a bad diode, op amp, or transistor.
by Jonathan40
Fri Jan 15, 2016 1:37 am
Forum: Synth Shootouts
Topic: Roland Jupiter 8 vs. Studio Electronics Omega 8
Replies: 6
Views: 6251

Re: Roland Jupiter 8 vs. Studio Electronics Omega 8

I've never played a Jupiter 8, but did own an Omega 8 with the stock filters a few years back. Presets weren't very good in my opinion, but I found I could get some great sounds out of it with some editing. However, it would freeze up once in a while, and I found their customer support rather inadeq...
by Jonathan40
Mon Jan 11, 2016 2:13 am
Forum: Gear Services & Other Goods
Topic: Roland sh-101 LFO/CLK RATE problem
Replies: 6
Views: 2622

Re: Roland sh-101 LFO/CLK RATE problem

I'm having the exact same problem with my SH-101, and haven't found any LFO/CLK adjustment on the schematic or circuit board. May I ask if the issue was ever resolved?
by Jonathan40
Mon Dec 14, 2015 9:00 pm
Forum: Gear Services & Other Goods
Topic: ARP 2600 Power Supply Capacitors
Replies: 0
Views: 2452

ARP 2600 Power Supply Capacitors

These are the capacitors located in the power supply for my 2600. Does anyone know if they are original, or perhaps older replacements? Any help is appreciated. Image
by Jonathan40
Sat Oct 17, 2015 4:15 am
Forum: Gear Services & Other Goods
Topic: ARP 2600 notes stuck on
Replies: 6
Views: 5165

Re: ARP 2600 notes stuck on

Never mind - I figured it out. I've realized that turning VCF down and VCA up in the mixer section solves the problem. Thanks.
by Jonathan40
Thu Oct 15, 2015 11:50 pm
Forum: Gear Services & Other Goods
Topic: ARP 2600 notes stuck on
Replies: 6
Views: 5165

Re: ARP 2600 notes stuck on

I don't have a keyboard for my 2600 and trigger it from a Roland SH-5. Does the 2600 make sound when the keyboard is unplugged? Yes, when I disconnect the cable, the 2600 drops down to a lower note that remains on indefinitely. DC voltage coming from the 2600's gate out goes from 10V (note on) to 0...
by Jonathan40
Thu Oct 15, 2015 3:03 am
Forum: Gear Services & Other Goods
Topic: ARP 2600 notes stuck on
Replies: 6
Views: 5165

Re: ARP 2600 notes stuck on

Actually, the initial gain is having an effect after raising the sliders underneath it. I took the keyboard apart today and found nothing noticeable, except a broken J-wire that shouldn't be causing the problem.
by Jonathan40
Tue Oct 13, 2015 6:29 pm
Forum: Gear Services & Other Goods
Topic: ARP 2600 notes stuck on
Replies: 6
Views: 5165

Re: ARP 2600 notes stuck on

Z wrote:You've got the Initial Gain set to "0", right?
Yes, and it doesn't seem to affect the sound at all, at any setting.
by Jonathan40
Tue Oct 13, 2015 2:56 am
Forum: Gear Services & Other Goods
Topic: ARP 2600 notes stuck on
Replies: 6
Views: 5165

ARP 2600 notes stuck on

I have an ARP 2600 with a Model 3604-P keyboard, and when I play notes they won't turn off. I've tried everything on the front panel, but nothing has worked. Something is keeping the Gate open. Anyone seen this before or have any ideas?