Aiwa ADF 990 Cssette deck

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I purchased this on ebay for $100. After replacing the main drive belt the deck works fine except that it can't recognise a type 1 or 2 tape and hence can only auto calibrate a metal tape. The detect switches are working ok so it must be a dry joint or HR connector. The wiring loom looks really messy and ditto everything else inside.

Is there anyone who owns one of these beasts that's done a service and might know what common faults there are to look out for.
 
next I'd check voltages at the collectors of Q3 and Q4

see attached schem

servive manual is here

rgds
jms
 

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