Well I've bought two of these off eBay now, and neither work. The first one has a bad photovoltaic cell, needle doesn't move. The one I just got the needle moves fine, but the ISO selection dial has no effect, it appears to be stuck around 2500 ISO (reads correctly on the low-scale at that ISO at any rate). Grr!!
Now, I know I can send it in for repair. The point of getting one of these old clunkers was that it would be cheap and nothing about sending gear in is cheap Besides it would blow my medium-format entry budget of $200 (lots of free expired film and a C220 on the way)
The new one (with the cell that works but ASA dial doesn't) makes grindy noises when I turn the ASA/ISO dial. This leads me to believe there's probably a bunch of gunk on what I assume it's attached to, a big potentiometer. So if I open it up and give it a clean (smells old and attic-y anyway) the dial should work again. Or maybe swap it out with the other meter (I'm OK at soldering)
I'll probably just dive in and open the case on the one with the broken photocell before I even get a response to this, but any tips and/or service manuals (a long shot) would be much appreciated. Looks like those two hex heads on the back are the way in....