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Beolover SyncDrive: DC Platter Motor Replacement for Beogram 4002 and 4004 (Type 551x and 552x)

Late Beogram 4002 and the 4004 (Types 551x and 552x), which have DC platter motors instead of the earlier synchronous AC motors usually suff...

Showing posts with label cabinet repairs. Show all posts
Showing posts with label cabinet repairs. Show all posts

Thursday, July 22, 2021

Beogram 8002 From North Texas: A couple more cabinet repair tasks

As I was repairing the main PCB mounting post I couldn't help noticing the way this Beogram 8002's aluminum deck lid had been reattached. Like many repairs of these aluminum deck lids someone had used a foam type double-sided tape that is better suited for insulation. It is too thick for this application and results in a visible gap at the seam where the aluminum deck meets the Beogram cabinet frame.

I don't like that. Having the gap there would bother me.



































I decided to pull the aluminum panel from the previous repair attempt and remount it correctly.

Here is the panel removed.  You can see the thick double-sided tape as well as the residue from the original B&O tape. All of that needs to be cleaned off and the surface prepared for some better 3M VHB tape.





















































When removing old glue residue I sometimes use paper towels soaked in isopropyl alcohol.  Most of the time though, I just use a product called Goo Gone.  It squirts onto the areas I want cleaned up and I let it soak for a few hours.



























This Beogram 8002 also has a tonearm deck lid that still had the original B&O double-sided tape...now deteriorated.  So I added it to the cleanup mix.



























Hours later I scraped the old adhesive material off all of the Goo Gone soaked surfaces.
That left me with a nice pile of goop.



























The surfaces are clean now and ready for some good 3M VHB double-sided tape.




















































Here is the tape applied to the clean surface of the cabinet.
Note: Don't forget the small spring that fits between the deck and the aluminum lid. That is for removing electrostatic charge on the deck surface.





















































The aluminum deck fits nice and snug on the cabinet now with minimal gap between the cabinet and the aluminum deck material.











































That is how it is supposed to look and is so much better than before.
Last is the reattachment of the two pieces that make up the tonearm compartment deck lid.

Two strips of VHB are applied to the surface of one of the plates, then they are fitted together.














































Finally, here is the tonearm compartment deck lid back in place.


Tuesday, July 20, 2021

Beogram 8002 From North Texas: Starting with some cabinet repairs

Before jumping right into the Beogram 8002 circuit board restoration tasks I decided to start with a couple of cabinet repairs.  There are two necessary cabinet repairs on this Beogram 8002 that require epoxy and 24 hours of epoxy curing.

The first repair is on the securing post for the main circuit board.
On the Beogram 8002 (and BG8000) the main circuit board mounts onto the underside of the cabinet lid.
There are guides that the circuit board slides onto, then a post with a rubber grommet that secures the circuit board in place.

When the circuit board is installed it should look like this.














The circuit board fits into the slot of the rubber grommet. The grommet slides over the mounting post.

On this current Beogram 8002 project the mounting post for the rubber grommet is missing.



























I have never seen that before. It makes me wonder how that could break like that.
The broken post and rubber grommet were missing...until I removed the Beogram 8002 component parts from the frame.

Underneath the floating chassis was the broken post and the grommet.
Here is a photo of the broken piece along with two candidates for a replacement.

























I could epoxy the original post back in place but I don't think it would be secure enough to last.  It would surely break off again.

My fix was to fashion a replacement post with a hole through the center.
I used a drill bit and an M3 tap to make a threaded hole for a mounting screw that would go through the replacement post and into the Beogram cabinet lid frame.



























With the threaded holes, an M3 screw and some JBWeld epoxy the replacement post should be able to stand up to any pressure against it.
























After the epoxy cured for 24 hours I fit the grommet onto the post.  Everything feels very tight and secure.


























That takes care of one cabinet problem.

The second issue is the typical problem of the fixed hinge catch for the dust cover lid lowering mechanism.

The Beogram 8002 dust cover has a leaf spring with a sliding bracket on the end that fits into the fixed hinge catch on the underside of the dust cover.  That hinge catch needs to be solidly attached to the dust cover.

The original B&O factory installation used double-side foam tape for the attachment. After over 30 years the original foam tape deteriorates and the catch becomes loose. That results in the lowering mechanism for the dust cover to fail.

Here is the hinge catch with the deteriorated tape.





















































I soaked the old tape residue with Goo Gone then cleaned everything up.



























I applied some clear epoxy for this repair and then put some weight on the hinge catch to hold it in place for 24 hours.



























After curing for 24 hours this hinge catch should be ready to use.



























I will put these cabinet pieces aside now and start on the circuit board restoration tasks.