Hi

Beogram 4002:

Does the motor spin free when you turn it with your fingers?

As I remember the plug from the motor could be inserted in reversed position.

White should be in front of the Beogram

Red in the back.

Test / check following:

1. Take of the MMC pickup and store it at a save place, or put at least the pickup guard on the system, be always carefull

     with this delicate piece. No uncontrolled movement of arms, fingers or tools!!!!

I would try :

2. Turn the ribbed platter without the belt by hand and look what's happening when you press start.

    does the tonearm traveling until the end and driving back to it's home position?

    While this traveling inwards do you hear the speed switch relay?

3. Have a closer look for the power rail comming via 1R13 (10 Ohm) and TR 2 (Emitter around 8,5 Volt)

    Diode 1D13 and resistor 1R12.

4. check the polarity of C5, C8, C 10, C11 not always the printing on the PCB's are correct, compare

    with the service manual.

Beogram 4004:

Check rail voltages at first, check for broken connection wires.

Kind regards

Christian

Thank you for your response - I am waiting to purchase a multimeter. 

I did do some basic elimination work. There is a ground issue on the 4004 (I am assuming) as the two fuses were blown. I checked each external connection (the motor, the control arm, etc.) - plugging each connection into the main PCB (not screwed into the chassis and held up by my hand) one by one and then plugging in the unit to see if it would if it would blow the fuses. None blew the fuses. That said when reattaching the the main PCB to the chassis with the screw in the red area, the fuses instantly blow. That capacitor (C1) looks to be connected to the transistor IC1I.

Any ideas from that?

Ian

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Hi,

I have both of those type of turntables fully restored. They are a couple of my favorites.
I recommend browsing

Hi

I'm not really sure, but are there isolation mica washers underneath the 2 big transistors of the Mainboard even one underneath the big transistor (tonearm solenoid) mounted on the chassis?

Also isolation washers for the screws holding the transistors.

Have a look

Regards Christian 

Any progress so far?

Christian