hifi engine

National Panasonic RS 269


I am looking for a National Panasonic RS 269 Service Manual.

I just got this beauty, but unfortunately after cleaning the head and pinch roller (with isopropyl alcohol 99%), the sound is highly pitched and flanger-ish.

I tried different cassettes that play normally in my other decks. I let a cassette to play over for long time, and sometimes it stops unexpectedly. I checked the belt and it doesn't seem to be in a bad condition.

Any ideas?

Thank you for your time.