Hi Jason,
If those solder pads look clean, with no traces of old solder, then you probably have one of the "in between" models which had solder pads added to the KLM-596 in preparation for a lithium cell, but never actually had a battery installed. Very early versions of the KLM-596 had no solder pads and no battery. The only way to keep patches was to keep 6 "C" cells in the battery compartment. The next version had solder pads but no battery, and still had the memory connected to the C cells via R1 and D1 (5v Zener diode). The last version had solder pads and a lithium cell soldered in, and R1 and D1 were removed from the board.
Here are some examples I've seen:
S/N 011912 KLM-596-2 - had no solder pads and no battery.
S/N 041368 KLM-596-7 - had solder pads but no battery. R1 and D1 are still on the board.
S/N 073712 KLM-596-8 - had solder pads and a battery. No R1 or D1 exist on the board.
I don't know how many versions of the 596 board made it into production, and I wish I had a list of what serial numbers had what board, but that's all the info I have so far.
R1 and D1 are over in the corner by CN9A where the A/C adapter plugs in. The pads are between IC18, IC19, the (+) terminal is the one closest to IC20 (toward the back where all the switches and jacks are) and the (-) terminal is closest to IC17 and the front edge of the board. In any case, R1 and D1 need to be removed if they exist, before you add a battery (or better yet, a battery holder).
Don B.
Hi,
I got a hold of a poly-800 recently, and it doesn't hold patches so I figured the battery had run out. When I opened it up I found that the place where the various tutorials say the battery should be is just empty, with 2 empty square pads sitting there.
Not sure why this is... I mean, who would desolder the battery out and not replace it?
Anyway, I'd like to solder a new battery in (I'm not so worried about getting a battery holder), but I'm not sure which pad is + or - , and how is the best way to solder it on (or do I ∗need∗ a holder?)
any info would be appreciated, cheers guys
Jason