hifi engine

Fisher 175 T

Hello tech-heads,

I acquired a Fisher 175 T that I am having trouble changing the stations on the tuner. There appears to be a "brake" on the changer to keep the station from wandering, but I don't see and on and off switch for it. When I look inside the case the tuner wire is intact, but it will not budge the tuner.

The wire "slips" (with difficulty) when the turner knob turns. I can move the actual turner that the wire is wrapped around, thus changing the station, but it is there inside the tuner that is binding things up.

I researched the data and don't see a "locking" mechanism on the tuner. Could someone advise me on how to get the turner moving freely again?

Thanks very much.
Napa, CA