That looks like a sequencer step display. Did you accidentally move the sequencer enable switch on the back?
Don B.
Sent: Wednesday, March 18, 2015 5:27 AM
Subject: [korgpolyex] Poly800 Mk-1 Battery Mod - have I damaged something? Error 1.85001 [1 Attachment]
Hi,
I bought a Poly800 last week which worked: I was able to load the factory presets via a .wav file and most of the keys worked. I repaired the keys by cleaning the contacts.
While I had the synth open I decided to apply a battery modification which I found at this location http://analog.no/cms/index.php?option=com_content&view=article&id=50&Itemid=49
![\"image\"](\"https://ec.yimg.com/ec?url=http%3A%2F%2Fanalog.no%2Fcms%2Fanalog_files%2Fimages%2Fmods%2F%2Fpoly800_1.jpg&t=1572481758&sig=ddGUa5oWs6icGAfscYT6fQ--~E\")
I confirmed all of the connections and tested them using my multimeter.
This mod is not the same as the one I've now discovered in the file section.
I removed C87, C88, D23 and D15. I bridged the trace at D15 and cut the trace close to C106
I have not touched R1 or D1
This is a Mk-1 Poly800 which didn't come with a memory backup battery. There are two 'pads' where the battery holder can be soldered.
When I powered up the synth it started ok and I made a simple patch to test that all the keys worked.
I then tried loading the factory presets from a .wav file played back from my phone.
The tape load failed and when I re-started the synth I got the error message 1.8 50 01 on the display (see attached image.
I'm puzzled as to whether something corrupted when I tried loading the factory presets or have I fried something while soldering?
I put all of the removed components back into the synth and re-bridged the cut trace.
The synth is still showing the same error message.
Any suggestions on what I might try next? I'd like to try resurrect the synth and fix whatever I've done.
thanks,
Peter