Poly 800 mk1 top segment of LED not lit
2012-09-19 by tombarndt
I ve been searching the forum for this issue and haven t found it yet, the issue is the top segment/line of the LED display isn t lit. Everything else work
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Re: Just made a trade for a broken poly 800! Problems at first glance!
2012-09-18 by mcdonaldtavish
Oh, I was actually considering replacing a few of the capacitors that had a weird residue on them, and I thought c88 was missing but it turns out on my version
Re: Just made a trade for a broken poly 800! Problems at first glance!
2012-09-18 by mcdonaldtavish
okay good to know about cap 88, thanks. Actually I was using the cap and resistor as random examples, I should have made that more clear. I looked at the
Re: Just made a trade for a broken poly 800! Problems at first glance!
2012-09-18 by bimmerfan222
Cap 88 was not installed in my Poly 800 M1. Never was there in the first place. R32 on the MAIN board is a 47K Ohm resister.. on the CHORUS board, R32 is 10K
Re: [korgpolyex] Re: Just made a trade for a broken poly 800! Problems at first glance!
2012-09-18 by Gordon JC Pearce
... You d have to check the service manual for that. I can t see any of the images, because Yahoo! s files area is borked at the moment. It sounds like the
Re: Just made a trade for a broken poly 800! Problems at first glance!
2012-09-18 by mcdonaldtavish
I powered up the 800 and looked at that those diodes, the first row of diodes actually lit up, the diode that was attached by a former owner did not, at closer
Re: [korgpolyex] Re: Just made a trade for a broken poly 800! Problems at first glance!
2012-09-18 by Tavish McDonald
Thanks it started working again I guess yahoo had a hiccup.
Re: [korgpolyex] Re: Just made a trade for a broken poly 800! Problems at first glance!
2012-09-18 by Michael Hawkins
You should be AOK in the group. You are not in any naughty bin. At least, not as far as I can tell. Mike ________________________________ From: Tavish McDonald
Re: Just made a trade for a broken poly 800! Problems at first glance!
2012-09-18 by mcdonaldtavish
Okay something weird was happening but now I can access the member only area again. Here are the pictures. What do you think those two caps are for? Also,
Re: [korgpolyex] Re: Just made a trade for a broken poly 800! Problems at first glance!
2012-09-18 by Michael Hawkins
Actually, the early Poly s had LED s in those steering diodes. So the LED is not entirely out of place. It s certainly not the first place to start looking,
Re: Just made a trade for a broken poly 800! Problems at first glance!
2012-09-18 by bimmerfan222
Im having problems with Yahoo too. I can post msgs, but couldnt access the files section. might try getting a photobucket or Flickr account to host your
Re: [korgpolyex] Re: Just made a trade for a broken poly 800! Problems at first glance!
2012-09-18 by Tavish McDonald
Good guess, from what I can tell it turns out they did do exactly that. I turned the board over and found a some wires connecting the jack to where the battery
Transistor Q1
2012-09-18 by bimmerfan222
I read that a tech used a NTE378 to replace Q1 transistor... http://sounddoctorin.com/synthtec/korg/poly800.htm said he reversed the leads? Guess the leads
Re: Just made a trade for a broken poly 800! Problems at first glance!
2012-09-18 by bimmerfan222
Hard to tell from the pics, but I wonder if the prev. owner/butcher managed to somehow re-route the external power connection direct to the battery terminals
Re: [korgpolyex] Re: Just made a trade for a broken poly 800! Problems at first glance!
2012-09-18 by Tavish McDonald
Yeah this thing is definitely going to need some work, I thought getting it cleaned up would be a good place to start while I find parts. I have powered it on
Re: Just made a trade for a broken poly 800! Problems at first glance!
2012-09-18 by patrioticduo
Some of the brown looking crud looks like you might have had a battery or two in the battery compartment go stale and drop its gooeey guts in your Poly 800.
Re: Just made a trade for a broken poly 800! Problems at first glance!
2012-09-18 by bimmerfan222
I think you have more problems than simply cleaning those PCB s up. Q1 is a tr2sb731 PNP transistor. You should be able to find a suitable replacement. How
Re: Just made a trade for a broken poly 800! Problems at first glance!
2012-09-18 by mcdonaldtavish
Here are pictures of parts of the inside I thought looked rough/curious. This board definitely isn t in the best of shape. I would like to clean it up nice and
Re: Data Dial Encoder Project - WORKING!!!
2012-09-17 by bimmerfan222
I don t think it s capable of holding both UP and DOWN at the same time. It can steady ON Up or Down, but not both at the same time. I get a glitch once in
Re: [korgpolyex] Re: Data Dial Encoder Project - WORKING!!!
2012-09-17 by Michael Hawkins
Yeah, it would just be much cleaner I think to use a power up reset - yes, just like a CPU power on reset. Though, I also think you should keep in mind that
Re: Data Dial Encoder Project - WORKING!!!
2012-09-17 by bimmerfan222
So you re suggesting I make a circuit that is like a power on RESET signal for a CPU? Think a 1Mega ohm resistor and 4.7 uF electrolytic capacitor would create
Re: [korgpolyex] Re: Data Dial Encoder Project - WORKING!!!
2012-09-17 by Michael Hawkins
I would recommend that you use a simple reset circuit to hold the two flip flops in the dormant state for a second after power up. A simple resistor and
Re: Data Dial Encoder Project - WORKING!!!
2012-09-16 by bimmerfan222
... I guess I m at a disadvantage at how to use the schmitt triggers to accomplish this. Any pointers? The LS package was the only one I had in my TTL/CMOS
Re: [korgpolyex] Re: Data Dial Encoder Project - WORKING!!!
2012-09-16 by Michael Hawkins
You could use the two spare schmitt triggers in the 74HC14. By the way, you should use HC series, not LS. Mike ________________________________ From:
Re: [korgpolyex] Re: joystick for EX800...
2012-09-16 by Michael Hawkins
The HAWK is the same code in original Poly, EX-800 and MK2. So using POTS on the EX-800 is absolutely doable. Mike ________________________________ From:
Re: [korgpolyex] Re: Data Dial Encoder Project - WORKING!!!
2012-09-16 by Michael Hawkins
I could change the boot code for you. Such as, hold down Bank Hold and then Up or Down to engage the clear function. Easy to do. Mike
Re: Data Dial Encoder Project - WORKING!!!
2012-09-16 by bimmerfan222
I m thinking if I just add a 555 oneshot multivibrator for each output of the flipflop, I can adjust the pulses with the proper combination/ratio of
Re: CC issues...
2012-09-16 by bimmerfan222
... OK... how about something simple like this? LFo1 Freq, LFO1 Mod Depth, LFO2 Freq, LFO2 Depth, SLFO1 Freq., SLFO1 modulation depth of LFO1 FM, SLFO2
Re: joystick for EX800...
2012-09-16 by bimmerfan222
I couldnt find a schematic for EX-500 on here, but I can t see why you couldnt add a 10K joystick into one. It probably has the same Main PCB as a Poly 800
Re: [korgpolyex] Re: Data Dial Encoder Project - WORKING!!!
2012-09-16 by Ullrich Peter
Hi! I also designed a datadial with discrete electronics some years ago. Worked but the partcount was quite high. So I designed a version that works with a
Re: Data Dial Encoder Project - WORKING!!!
2012-09-16 by bimmerfan222
... Well this is an unforeseen consequence. I looked for info about the software clear command in the docs.. couldnt find it. I did make a schematic and
Re: [korgpolyex] joystick for EX800...
2012-09-16 by Michael Hawkins
Q: isn t the joystick used for entering parameter data on the poly800 mk1+2 kybd versions? A: The joystick can be used to change programs and parameter data on
joystick for EX800...
2012-09-16 by k9k9dog
how about a Sony Playstation type joystick knob for the EX800, since it doesn t have one? doesn t stick too far out (also has additional click down action
Re: [korgpolyex] Data Dial Encoder Project - WORKING!!!
2012-09-15 by Michael Hawkins
Holding down Chord and Hold during power up causes the HAWK to clear all patch memory. Holding down either Up or Down during boot up will cause HAWK to clear
Re: [korgpolyex] Re: Just made a trade for a broken poly 800! Problems at first glance!
2012-09-15 by Peter van Beerendonk
I had some problems like this also. Batterij terminals where corroded but seemed to be working. When I removed the batteries and used an adapter (9V 1.5A)
Re: Just made a trade for a broken poly 800! Problems at first glance!
2012-09-15 by mcdonaldtavish
Okay thank you, amazingly I forgot to mention one of the most important things that I noticed, there were signs of corrosion in the battery compartment, but
Re: [korgpolyex] Just made a trade for a broken poly 800! Problems at first glance!
2012-09-15 by Martin Ator
Sounds like problems with IC s. It will need opening up. Have a look to the right hand side of the main circuit board for battery damage. It might look like
Just made a trade for a broken poly 800! Problems at first glance!
2012-09-15 by mcdonaldtavish
Hi, just made a trade for a broken poly 800. At first glance this is what I have noticed about my broken unit. Let me start by saying I have yet to open this
Data Dial Encoder Project - WORKING!!!
2012-09-14 by bimmerfan222
Yes. A REAL working data entry knob! Go watch the vids of it in action! http://www.youtube.com/user/Synthetech After figuring out what to tap into on the
Re: CC issues...
2012-09-06 by bimmerfan222
Can you give me a # you had in mind?
Re: [korgpolyex] Re: Hawk-800 / Atomahawk Preset Query
2012-09-06 by Michael Hawkins
The EX-800 and Poly-800 (original PS-800) have the same patches and sequencer in the default sysex dump. The MK2 is quite different. Glad you got it all
Re: [korgpolyex] Re: Hawk-800 / Atomahawk Preset Query
2012-09-06 by Dave Mooney
Hi Mike, I’m running boot version 1.95. I thought I had the latest software v2.53 but I couldn t be sure, the synth technician I got to install the hardware
Re: [korgpolyex] Re: Hawk-800 / Atomahawk Preset Query
2012-09-06 by Michael Hawkins
I assume you re running the latest boot version 1.95 and software version 2.53 - correct? If not, you should upgrade. I just tested my own Poly using MIDI-OX.
Re: [korgpolyex] Re: CC issues...
2012-09-06 by Michael Hawkins
Too many. ________________________________ From: bimmerfan222 To: korgpolyex@yahoogroups.com Sent: Wednesday, September 5, 2012 5:22 PM
Re: CC issues...
2012-09-05 by bimmerfan222
if you provide a short list of those you want to control, then I can have a look at implementing them. Short list eh? Well I tried to make it short, but
Re: [korgpolyex] Re: Hawk-800 / Atomahawk Preset Query
2012-09-05 by Dave Mooney
Cheers Mike, I ve just tried what you said and have gotten better results however I am still having issues: If I set the sysex at the levels suggested in the
Re: [korgpolyex] Re: CC issues...
2012-09-05 by Michael Hawkins
There are quite a few simple CC values that are not being used by the HAWK implementation at this time. So if you provide a short list of those you want to
Re: CC issues...
2012-09-05 by bimmerfan222
I don t see why using NRPN s would limit you It s due to my complex setup of the pots and switches and the limitation of the MIDI CPU that translates their
Re: [korgpolyex] Re: CC issues...
2012-09-05 by Michael Hawkins
Q: I began to assume they were ref# s meant for the firmware and not actual MIDI CC s. A: I shall revise the document. It is confusing. Q: I m guessing it
Re: CC issues...
2012-09-05 by bimmerfan222
... Yea, it d simplify things.. but we cant have both 100% proprietary to the HAWK CC s and Standard CC s. I think I see why Mike did it this way.. so the