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Technics Tuner amplifier SA190L

Hello ... could someone help me out with a service book for Technics tuner-amplifier SA190L
Problem is situated in the tuner (false display-reading) and no "back-up" of fave-stations
For that last problem I think I'll have to change the soldered battery but it could be something else



Technics Tuner amplifier SA190L

I would first check all the solder connections on the display tube; if even one looks bad I would resolder them all. If that doesn't fix it I would check capacitors around the display tube, then power supply to this circuit.
If your memory is not keeping the station pre-sets I would check the battery, then the large value capacitor on the 5 volt line for the microprocessor. The SA190 is listed in the library; C908 is .047F (that's farad--these caps are often green). It's on the Vdd line on the microprocessor.

Technics Tuner amplifier SA190L

Thank you for this response ... I'll try that ...
The tuner is working but display shows wrong frequency (0.5mhz-shift)... and memory is totally not reliable
I found the schematic but not the entire service-manual ...