[sdiy] Real Easy Juno 106 Question (plus a TR-707 whine at the end)

[media.nai at rcn.com]

At 4:40 AM -0500 03/23/02, Chromatest Pantsmaker wrote:
>
>On the bender board, what is the value of C1, it looks like it should
>be an electrolytic. It's just at the top of the board, just below the
>center connector.

I no longer have a 106, but I kept the schematics (I always keep the
schematics :)  Anyway, C1 is labeled "10/16".  I have no idea what the
@#$%& that is supposed to mean, but it is the same as C2 and C4.  I'd read
and measure one of those.  Imho, as power supply filters, their value
shouldn't matter much, and anything between 10uF and 22uF should work.

>Oh, if you're there, what are the values of R1-6

R1  18K
R2  10K
R3  10K
R4  10K
R5  33K
R6  2.2M

Aren't they color-coded??

>and D1-2.  For the Diodes, I used 1N914's  is this okay?  I can't tell
>what was supposed to be there.

It doesn't say, but based on the voltages, that's what I would try.

>that's all... TR-707 problems follow.
>
>everything works apparently properly (LED's, sounds, triggers, etc)
>except the sequencer portion when it resets to step 1.  It glitches
>everytime here.  If there is a sound (say BD1) at the first step, it
>will usually trigger that sound/step twice before resuming the pattern
>normally.  Also, when I select a pattern, I can only select
>every-other one.  When I select pattern 3 (from any bank) 3 will
>flash, and 4 will light up.  When I select pattern 4, 3 will flash,
>and 4 will light up.  When I select pattern 5, 5 flashes, 6 lights up,
>etc.  The only one different from this is pattern 1.  Pattern 1 will
>not play.  Pattern 2 will though.  Select pattern 2, led lights, 1
>flashes.  Press 1 and it flashes (no light at 2) and it won't start.
>
>pressing BD1 manually will trigger the sound though, so the button
>itself is okay.
>
>any ideas?

Yes, for less than $100, you can buy a working 707 :)