RZ67: Shutter Not Releasing from Blown Diode and Capacitor
Originally posted on Instagram. Notes from the repair bench, kept here as a searchable archive. View the original on Instagram
This RZ67 came into the shop with the complaint that it would not release the mirror/shutter. First thing to do is check if it is operational on the mechanical setting (orange dot). If so (and this camera did work on mechanical) then we have narrowed the issue down to electrical.
After getting to the main circuit board, the immediate obvious issue is a blow diode. This is the top diode shown in the third photo. Visible is the cracked housing. But, diodes on this camera don’t generally break without a reason so this is actually a secondary issue. Underneath the circuit board lives a capacitor that discharges through this diode and in this case after removing the capacitor, it looked quite ugly as seen in photo four. If just the diode was replaced, the camera would work somewhat for a short while of time before giving up again!
New capacitor and diode installed and all is well again.
