Beogram 4004 (5526): Restoration of PCBs and Reservoir Capacitor

After the restoration of the arm lowering mechanism of the Beogram 4004 (5526) that I am restoring right now, it was time to look after the PCBs and the reservoir capacitor. This shows the main PCB in its original condition:

and a detail shot of the 'RPM control' section:

I replaced the electrolytic capacitors, the RPM relay and the RPM trimmers. The original electrolytic capacitors often fail at this point in time, and the relay/trimmers are often oxidized, which can cause platter RPM fluctuations. This shows the rebuilt board

and the RPM section:

I did the same to the output/remote control PCB:

This is a detail shot of the output section:

I replaced the capacitors and the relay, and also added a switch that allows connecting the system and signal grounds together if there is a hum issue (often an issue when using RCA adapters without ground breakout):

The final step of this part of the restoration was to replace the reservoir capacitor. This shows the original unit:

And the modern replacement:

On to the RPM LEDs and the platter motor restoration!