SR-52A rebuild project (SR-52A 942058 LTA4176)

[albertofenini]

Hi everyone

while restoring the SR.52 we have, a couple of spare units came out from our drawers
these are pretty beaten up, but we should have almost all the parts

we started yesterday with one of the two, and thanks to the contribution of
Klaus Overhage we also have pictures of how to re-connect the card reader

these models are different, probably earlier versions, from the two we restored last weekend

card reader is attached in a different position and components layout is also different

one doubt we have is the following : in our model close to the upper battery contacts there is a transistor,
but there are also markings for another one called Q4, this is missing on both our spare units

we don't recall if we removed or not, but looks like those marking are untampered ...

anyone can tell us what kind of transistor is ?

pictures of the restoration can be seen here : SR-52 942058 LTA4176