After finishing most of the mechanical work, it was time to start repairing the electronics on a Beogram 4002 (5503) turntable. Replacing all electrolytic capacitors is recommended, as their internal fluid often leaks or dries up. I use high-quality Japanese capacitors to ensure my repairs last as long as possible. Tantalum capacitors, in particular, must be replaced because they can fail dramatically if a short circuit occurs, potentially damaging the circuit board.

Replacing the large power supply and motor capacitors is always satisfying. Here’s a picture of the original components:

The two smaller capacitors on the right are for the motor, while the two larger ones on the left belong to the power supply.

This image shows the back side, facing the motor:

Modern capacitors are more compact, allowing for a cleaner installation using a custom 3D-printed adapter:

This adapter is available to anyone interested - simply send me an email.

Here’s the result after installation:

And from the back:

The adapter fits securely under the original retaining strap, and dedicated grooves help to route the wires neatly.

Next, I replaced all the capacitors on the main board. Here’s the board before, with the orange capacitors often showing signs of damage and the small orange dots indicating tantalum capacitors:

Two more tantalum capacitors are located on the back:

And here is the board after replacing all the capacitors:

And the back:

Several other electrolytic capacitors are present on the secondary boards, like this one on the sensor board:

This capacitor was also replaced:

Another capacitor on the output board, located beneath the keypad, needs replacing. I will address this when I swap the RPM indicator light bulbs with custom-designed LED boards. Removing the RPM indicator panel will provide access to the bolt securing the keypad. More to come!