Here are some interesting write up on mitusbishi/ Chrysler infinity head unit systems. Apparently most of them were built by mitsubishi and thus shared a lot of components.
In case you ever attempted to fix your stock unit, the first one is the same unit that offered in 91 model:
91 double din with CD player
91-92 model probably have a similar unit like this one:
Chrysler infinity IIb
Looks like most of these will have issue with cassette loading mechanism.
There are a lot of info about these head units over there, worth taking a look at.