Help me resurrect my DR 110!

creekree · Last edited by creekree on Mon Mar 22, 2010 7:11 am; edited 1 time in total

Hi all,

many moons ago I decided to take the voicing board out of my DR 110 and mod it heavily. The project was a success and I really enjoy the drum sounds I get out of it.
Now, Sebo posted a PCB layout for the DR 110 here on e-m.com, and I thought it might be nice to rebuild my DR 110.
That being said, I need to know: what kind is transistor Q19 in the power supply section?
If someone with a DR 110 could have a look it'd be greatly appreciated!

The schematics just show a PNP and the annotations say "all PNPs are 2SA1115F", but I recall that Q19 was something else and physically twice as high as the other PNPs. I cant have a look at my original analog board because I pulled every component that is not responsible for the drum sounds because I had some noise issues.

I want to get the power supply and clock sources for the micro working first, before I start rebuilding the voices.

Many thanks!

Chris

andrewF · Posted: Wed Mar 17, 2010 7:44 am Post subject:

you are correct it is not the same. It looks like two transistors joined together.
it is marked

8647
c

36 2

from this page it looks like the 8647 is a datestamp and the device is a Motorola TIP36C

Futurlec have them (follow link to see datasheet) but in a different package. Probably any PNP power transistor will do if you can't find exactly the right one.

good luck on your noble quest!! Very Happy

Sebo · Joined: Apr 27, 2007 Posts: 564 Location: Argentina

Hi Creekree:
Mine says B647 C, I don't know what it is.
Good luck with this project, I abandoned mine, may be I continue it in the
future.

andrewF · Posted: Wed Mar 17, 2010 9:16 am Post subject:

i need my eyes checked Shocked

it is B!

look for 2SB47
futurlec have them
http://www.futurlec.com.au/transistors/2SB647.jsp

creekree · Posted: Wed Mar 17, 2010 9:40 am Post subject:

thanks guys, 2SB647 is easy to get in germany.
i'll keep you posted about my progress.

ickystay · Joined: Nov 15, 2006 Posts: 143 Location: Oregon

creekree · Posted: Thu Mar 18, 2010 2:31 am Post subject:

Sebo posted it quite some time ago, and after 15 mins of threadhunting I could not find it.
I hope Sebo does not mind me reposting it.
Just to make this clear: SEBO did all the work of scanning/retouching the image! Thanks Sebo!

Also: please be aware that this PCB differs from the PCBlayout as shown in the service manual floating around the net. The headphone section is different, the voice/clock/power section the same.

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Dan Lavin · Posted: Thu Mar 18, 2010 5:50 am Post subject:

Thanks Creekree and Sebo!
Just a note to anyone attempting to build this: Roland uses 1/8W resistors, although I suppose one could use 1/4W and bend them around into pseudo-radial parts.

creekree · Posted: Thu Mar 18, 2010 8:30 am Post subject:

Sebo · Joined: Apr 27, 2007 Posts: 564 Location: Argentina

Hey, great you find the PCB usefull, as I said before I'd put this project in hold.
Just note that if you want to use Press'n'Peel you need to flip the image.
Cheers.

ickystay · Joined: Nov 15, 2006 Posts: 143 Location: Oregon

creekree · Posted: Mon Mar 22, 2010 7:10 am Post subject:

So I worked a little on the DR 110 and it seems I have hit a wall that I cant climb across.

After dropping in the correct transistor I got the power supply working, and it was a matter of about 45 minutes to have the internal clock and the tempo clock set up as well.

I hooked up the digital board, but nothing happened. The screen stays blank and button presses will not produce any trigger signals whatsoever.

I checked right at the CPU if a)it receives power, and b)if the internal clock signal arrives. Both is the case.

I keep my head up high and will not yet accept defeat. So:

The 4011 (IC3) on the digital board still gives me headaches (it is not broken, it is a new IC and I swapped it with a known good one).
The Tempo clock goes to pin2. I can also read the clock signal at pin 3.
Pins 1,5,9 and 12 are tied together and the schematics tell me that I should be able to see at least something on my oscilloscope when I probe at their junction.
Please see the attached schematics - I dont know how to properly describe this.

I am not electronics savvy enough to fully understand what is going on here (I'm more the paint-by-numbers guy, really).
Should I be able to read something all the time or only when a button is pressed?

If someone could explain I'd really appreciate it. (The DAN201 diode arrays are ok, btw).

Cheers, Chris

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