I have put a lithium batt in across what was C88 and cut the diodes from the track - all seems OK. )My previous post I should have said there was 4 V across the c88). Loaded the replacement patches from here http://www.geocities.com/SunsetStrip/Studio/3507/ex800info2.html It took quite a lot of tria...

Thanks guys, my particular unit serial #013263 has no mounting tracks between IC 18 & IC 19 however the other parts and tracks are there and C 88 has 9V across (running on 9V power supply) Looks like if I cut the tracks add the link and remove the bits I should be able to put a lithium batt across w...

Hi I just joined up as i'm resurrecting a neglected Poly800 for playing about with It is the earliest model and has no internal backup battery Anyone know where to fit one (I will download the schematics soon but I suspect they only show the MK2)? As it is now, there are some sounds, no.53 seems hal...