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Saturday, December 14, 2019

BeoGram CD X: Restoring the door motor

In the previous post about this BeoGram CD X unit I got it working again by reworking the board vias. While the CD X was playing CDs again its motorized door was struggling with opening and closing.

I ordered a new belt for the door motor and received it from Martin Olsen this week.

This post shows the opening back up of the CD X and changing out the belt motor plus checking capacitor 2801 (220uF, 10V) of the door's motor drive circuit. The capacitor is sometimes faulty.
I will also show the restored vias on the Servo board (PCB 04) as I promised in the first CD X post.
Here is the CD X with the bottom cover removed. You can see the door motor assembly on the left.

















































I removed the top cover from the main CD assembly to make easier work of the belt replacement.




While the CD assembly is out I will take this time to show photos of the Servo board (PCB 04) I restored the vias on earlier.






















Continuing with the CD X motor belt and capacitor 2801 replacement, this next picture shows the CD X top cover with the door motor assembly.


















The door motor belt cannot be replaced without some more disassembly so the next few pictures illustrate taking the motor assembly apart to get at the belt.


























To remove the gear blocking the extraction of the belt there is one of those pesky C-clips. Pesky because they are very easy to lose.






















I had to loosen the two screws on one door switch assemblies to give enough clearance to remove the large, white, plastic gear. Finally the belt as accessible.
























I installed the new belt and reassembled the motor assembly.























Now it is time for the 2801 capacitor.  I de-soldered and removed it. Sure enough the 220uF capacitor only measures 65uF.






















Replacing it I can continue the reassembly of the CD X.






















A test of the restored door motor assembly now shows the door opening and closing with ease.
This CD X is ready to go back into service.








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