As I now have my pizza boxes, well and without damages, in my home, its time to start the cleaning and checkup of all the units, here starting with the BG CD50. I have done my homework and read all about the CD on the forum, Die Bogener and Mika, and Beocentral, Notebook.
If you have some good advises or stupid jokes, please reply.
I read that the CD50 is terrible to service, but taking it apart is a lot easier than BM 2400 and 4000.
Today I took it apart, so here we goes.
The CD must have been stored for some time in a dusty place, look at the dust on the CD tray and the back of the unit.
To get of the top cover, loosen the 2 screws at the back of the unit, loosen them until you can push the latch upwards, the tighten the screws lightly, pull the cover 5-10 Mm to the back and lift it straight up.
Here the CD opened, to get the top PCB out take out the screws at the red arrows.
Now lift up one side of the PCB, take a pic to look at when you have to put it back again
Same from the other side
All the cable connectors in this unit are different sizes or colors, so easy enough to put back again, only one wire to desolder, Dont forget it, its gray.The connectors have some lashes use a small screw driver to loosen them, insert the screw driver at the red arrows, pull all plugs.
The PCB out, someone had the great idea to build a Garage in the middle of the board, inside there you will find 8 caps and some other goodies
Below the top board you will find one more, some of the cables are soldered to the board, but follow them to the other end, there you will find the plug, again take out the screws at the arrows, there are 2 black and 2 nickel screw, put them back in the same places, the nickel ones are ground screws. Now lift up the side of the board, side away from the laser unit, as high as you can, then slide and wiggle it out to the back of the unit, taking care not damage the small jacks or pull out wires.
Board out, at the arrow you see the 7 pin DIN and RCA board, its fitted to the chassis with 3 small plastic expander, with a screw driver, between the board and the jacks, press out the center pin of the expander then from the chassis side, you can pull out the whole plastic piece with a screw driver and one good finger nail, be careful its plastic 30 years old.
The laser unit comes out after taking out the 4 screws that hold it to the rubber buffers, just turn it out to the side of the chassis, do not desolder the wires going to the small contacts. As this laser is "upside down", there is is no dust to speak of.
I placed a soft piece of cotton with tape over the laser for protection, as I know I will move it without thinking of what I'm doing.
The screw drive and the gearwheels looks clean and the grease is still soft
To get out the disc loader, move the gears by hand to the outer most position (check the small contacts below the gears), mark the gears, take of the arm for the front door, then take of the stop and the 4 plastic guide pieces, lift the sledge of the gear and take it out to the front. Forgot to take pics, I was so exited. The red arrows point to adjustments of open and closed position of the front door, dont touch the left one and bring the right one back to where it was, if the door was ok closed and open.
And now to the fun part, checking some of the caps with my new Blue ESR meter, I found one or 2 bad ones (over max limit) and many near the max limit, where max limit is 1 Ohm, they went 0.8-9 Ohm, and so on, I'm going to change some 70+ caps the ones below 1 uF with Wimas MKS2 and the rest with Nichicon high temp.
More to come
Location: Mexico city
Printing machine technician
Restored various 1960-70 items
Rock and Roll music
Collecting Vinyl
Restored Jukebox Wurlitzer 1050
