The transistors look fine. Have you checked the functions of the sensor arm (lamp/lens/sensor) ? Is there a reasonably well defined white spot of light on the record from under the sensor arm ? If it does not see a record, it won't lower the tonearm, neither automatically nor manually. Martin

Welcome to Beoworld ! It's a combination of a construction flaw and a worn belt, causing the electronics to accept twice the frequency of the motor feedback than normal. If the turntable belt is slipping, the motor will accellerate too easily, basically spinning up with the belt skating on its pulley. It will reach a too high speed and the electronics

Nice work indeed ! And thanks for the photos. We like photos. You may want to strengthen the board at the breaks with a little 2-comp. epoxy or similar to avoid eventual shorts and/or more damage. Martin

Hej Henrik, Tak for svaret. Det er utroligt pænt af dig men hvis dine CX100 kan gøres i stand, vil det være synd at hugge dem op så lad os lige se om der kommer andre svar først. Martin

It definitely sounds like a belt problem. I take it, you have tried different tapes ? You have a PM. Martin

I have one. You have a PM. Martin

Jeg søger en basenhed til Beovox CX50, alternativt den nederste fra en CX100. Den må gerne have dårlige kanter. Evt. en hel højttaler eller et par med optiske mangler. Martin

I'm sure, I can find one if noone's closer. Martin

If you can hear the motor running but the tape doesn't move, it's most likely a belt problem. Most of the autoreverse decks will need new belts now. I can supply new belts if you need. Martin

Sounds like a capacitor problem which would come as no surprise. Check the muting signal on the base of 2TR100 and 2TR200 (or anode of 2D1). A rising DC here will cause a gradually lower and lower volume and eventually complete mute. A voltage ramp like this could suggest a leaking capacitor. If the muting voltage is indeed creeping up, I would check