It is common that in "M" mode that it would work as this circuit gets less use and therefore more likely still working. Did you try shining a bright light into the mount during tests?
Oh! I forgot! Is the tab working? When you move the Aperture tab, the TTL tab and chain should move too.
Which version is the TTL meter?
Honeywell Pentax name badge and an "H" stamp with a ON only switch
Asahi Pentax name badge and the "AOCo" stamp with a ON only switch
Asahi Pentax name with "AOCo" stamp and a ON/OFF switch
Pentax name with a ON/OFF switch
...last I observed, these are know version and I've found one that was fudge together by a seller from a combo of new version badge on an "H" body... "as-is" sale
Last edited by MysteryOnion; 09-15-2011 at 05:53 AM.