Beogram 4004 (5526): A New Arrival from Pennsylvania - Initial Assessment and an Interesting Find

A Beogram 4004 (5526) in need of some TLC recently arrived. I had a first look:

The cosmetic condition of this Beogram 4004 is pretty good. The aluminum panels are almost spotless:

Even the keypad is still in pretty good condition with only minor signs of use:

The platter has a few small blemishes:

We will see if they are permanent or can be cleaned away.

The plinth is pretty nice with good corners:

The plexiglass hood has the usual damages:

But it should be possible to polish it back to a pretty nice condition. Luckily, there seem to be no significant damages on the inside of the hood.

A look under the aluminum panels revealed some 'human activity':

Most remarkable is the non-spec motor from a later Beogram:

The type label reveals a manufacturing date of 1985:

This is an interesting find. I was not aware that one can scavenge motors from later Beograms of the 5xxx/6xxx series and implant them into 4004/4002s.

A look around the main PCB revealed a 'creative interpretation' of replacing the main reservoir capacitor:

Apparently, it was believed that 'more is better'. I suspect the reason for this arrangement is that the solenoid does not activate when this Beogram is started. During the attempted repair the lead to the solenoid was jumped with an additional wire:

The thick white wire seems to bridge the standard connection that runs through the white wire-to-board connector. All this suggests that the hypothesis behind this repair attempt was that there is too much impedance in the connections to activate the solenoid. Further investigation will reveal the real root-cause of the solenoid malfunction.

Otherwise this Beogram is in pretty good condition and at this point I do not see any major obstacles to bringing it back to its original glory.