Years ago, I bought a non-working Gakken SX-150. Tonight, I finally got around to trying to get it working.Switching it on lights up the led, so that’s a good start. However, there’s no sound output. Either via the built-in speaker or the "output" socket.
I’ve had the meter on the innards, and there is power to the board. There’s a voltage difference of about half a volt across the Variable resistor track, and the end of the stylus is about 3 volts
I’m a bit stuck now.. no amount of fiddling with switches makes any difference.
I’ll do a bit of research and see what happens.
This is a longish story, but I have now tracked down some NOS (New old-stock) AMI S10430 chips.
If you recall the original story, I needed one for my Korg Delta, but couldn’t find any. I then found a (REALLY COOL) guy in Holland who had FOUR untested chips. We did a deal, where I got one chip, and sold the other three for him (after testing). That worked out really well except for the stupidly long gap in the middle where I did absolutely naff-all. (Other projects, bah!)
Anyway, I found a link on a forum where another guy said he may have a couple of untested chips. I got in touch, and when he looked into it he actually had EIGHT, plus some other stuff. We’ve done a deal, and I bought the lot, untested.
I still have the Korg Delta with the socketed S10430 (IC3), so I CAN test them. I plan to keep some as spares, and sell some on. Depends on how many work..Watch this space. I MAY use eBay again, or just sell from this site.
I’m quite interested in the “other stuff” he’s bundling with the S10430s. These are described as “rhythm generators on a chip.”. Again, watch this space..
That’s right. The RX21 I bought in a moment of “Buy-it-now” madness is for sale. I’ve had a play with it and it’s fine. Backup battery is working, as it saves whatever I program into it.But it’s not for me. Grab yourself a bargain. (Check out the front page for details)
Just a note to say I have found the fault with the 4011 replacement: I tested all 14 pins on the IC socket after removing the chip and.. one of the pins does not beep on the meter.. how can an IC socket not have continuity from top to bottom?
Anyway, it doesn’t, so I need another socket.
Maplins in Middlesbrough is still trading, so I’ll give them a try..
Update: not any more. I did buy a new socket before they closed, though.
Still got issues with it. I think some solder traces are damaged. I have bought some new lead-based solder to try and fix this.
The dr-55 schematic suggests that pins 10,12,13 should be connected together, so a continuity test should confirm that.
I have now sold both my Korg Electribes (EA-1 and ER-1). I got £125 for each of them, and I have to say that it was MUCH easier to sell the ER-1 (drum machine).
Here’s a selling tip: include the spec from the Korg website in the listing. I was on the second relist for the EA-1 when I added this, and it sold for the full amount an hour later.
My “Itchy trigger finger” went off again.. this time I bought a “broken” Mattel Synsonics Drum machine.
I’ve always liked these things, but as I remember, the last one I had was very noisy and I didn’t have any way to shut it up at the time.. Pretty sure I sold mine to Shaun, at dubsounds.com, who was compiling a huge collection of drum machines, for sample pack creation.
Anyway, that was then and this is now. The machine would have been delivered on Easter Saturday, IF I’d been in at the time. Nobody else could be bothered to answer the door, so now I have to wait until Wednesday, which is the only late opening for the sorting office.
The one I just bought is rough and non-working, so we’ll see how I get on with that,
No Work Done:
I’ve done absolutely NOTHING on ANY of my projects, (DR-55 / SR-99 / Korg Delta / EK-2). I really MUST get a grip. There are other machines in storage as well.. (M500, SH1000, CZ3000, Big Roland Thing).. the big Roland thing is getting in my way.
Yes I know. Itchy trigger finger on the Buy-it-now button..
This one is a bit scruffy, rusty battery cover, and from the description it looks like another 4011 transplant.
Hopefully I can turn this around before I go off to Bulgaria in a couple of weeks. Already got a 4011ube and a 5501 just in case.. possibly an IC socket as well.
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