What's wrong with my Beocentre?

It is normal to see this center will go of after a few minutes when it is in tape player mode or CD player but no playing. Only in mode "Aux" and "radio" it is permanently "on" until "off" by hand or remote. . If problem persists in all modes then obviously something is not right with control system. You may try "my" idea - switch off, remove mains cable plug and press remote key for example "radio" like normal control. After plug mains back and check if changed. In my center I have other than yours control malfunctions and I do not blame unit but electronic interference or mains voltage defects.

The Phono/Aux input has a slider switch to the left of it to choose whether to make it a regular line-in jack or to utilize the phono stage. The ground terminal is just above the jacks. The Beogram 4002 likely has a muting circuit that's in effect when the tonearm is in the lift position, which would explain the lack of hum til the stylus lowered to the record.

this old timer probably has an output amplifier fault.with a circuit diagram any competent engineer shoulb able to locate the problem with the turntable removed access is easy and so is replacing parts

It is likely the audio output ic has failed, check the speaker wires for shorts, if okay! you will need a professional to take care of this.

If the take-up spool (r/h) doesnt turn the autostop will activate.Both these spools get clogged with old grease with age, remove and clean/regrease them,check all belts while apart and replace any limp ones.Removing the tape deck requires some knowledge.

the turntable wont spin unless a record is on the platter,the centre 45 adapter weighs the record to determine 33/45.try pressing 33 and turning the platter by hand(remove expensive cartridge first!),if it starts to spin the motor leaf switch is at fault.is the belt in position.the motor pulley can become unglued.

its likely you have 2 seperate faults.parts for the tape deck are discontinued.check belt on turntable, if its ok not much else can be done,no spares!

You will have to pay for the labor, if it's just truly broken RCA phono jacks, you can have them replaced by any ham radio guy or electronics guy with a soldering iron. It won't look perfect, but it will work just fine if it's only the jacks and not the switching circuitry. Radio Shack even carries (carried) single RCA chassis mount jacks to fix this.

this sounds like a beosound 9000, if so it requires a new cd mech assy.