Beogram 4004 restoration

21 replies

Hello B&O lovers. This is my first post here: I hope I would be accepted in this community, since I found a beautiful (and cheap) Beogram 4004 on eBay and I didn't resist to its charm… When I was a young boy and couldn't afford a proper hi-fi system, it was one of my dreams, so I decided to make myself a gift :-)

The eBay seller told me the turntable wasn't working properly, but after I fixed some false contacts and replaced some capacitors, it started up… but the arm assembly travelled toward the center and back, without lowering on the record. I found that the main board relay wasn't working (broken winding) and I replaced it with its twin from the second board. Then I managed to install a different relay on that board, much less cluttered.

I should have test the turntable at this point…  but I decided to replace all the capacitors instead. It was a big mistake… now there's a short circuit somewhere and the Start button doesn't work anymore :-(

I'm sure I'll find the fault, but it won't be an easy task and it'll take time. Before discovering this forum, I downloaded a 4002 service manual with an addendum for 4004: unfortunately the print quality is terrible and the board pictures (completely different from 4002) are missing. Could anybody tell me about the quality of the service manual available here? I'll probably upgrade my membership anyway, but I would be glad to get the right 4004 service manual: my job would become much easier.

Thanks in advance for your collaboration. Any suggestion is appreciated.

Hi. One of the new tantalum cap was faulty (shorted) 😠 

I don't know if it was defective or if I toasted it replacing the relay… But now the turntable is working 🤩

Now it's time for alignment, but first I'm gonna find a new belt. 

Can anybody suggest me where to buy the right belt for the 4004?

Many thanks in advance.

Contact user Dillen (Martin) on here using private message, he sells belt kits for the Beograms. Best to get a new platter belt and a belt for the arm servo.

Drew

As Drew mentioned Dillen for belts, he sells the rights ones, welcome to the forum, and nice to see something happening in the vintage forum, please keep us updated when you have got your belts.

Location: Mexico city

Retired
Printing machine technician
Restored various 1960-70 items
Rock and Roll music
Collecting Vinyl
Restored Jukebox Wurlitzer 1050

Thank you guys. I already replaced the arm motor belt and I sent a message to Dillen, I'm waiting for his answer…

PMs are called "Conversations", correct? I didn't find nothing else about Private Messages on this forum.

They used to be called "Private Messages" or PM's for short on a previous version of the BeoWorld forum software.

Now called "Conversations"

I just bought the drive belt. Dillen wrote he'll send it out tomorrow. I can't wait...

The turntable has a strange behavior, by the way: when I press Start, the arm travels to the right position (30 or 17 cm) then returns to home. If I press another key to stop the "auto-return" movement and I use the Up/Down key to lower the arm, the turntable plays… although sometimes it stops all of a sudden and the arm returns home 😉

I'll wait for the new belt, before to check adjustments and fine tunings. In the meantime, does anybody have any suggestions or advices?

Thanks a lot, guys.

Hmmm. I just upgraded my membership to Silver and downloaded the service manual for my BG4004. Unfortunately, it's the one I got already… the BG4002 manual with an addendum about the differences from 4002 and 4004. No schematic diagrams and PC board drawings. 🙁

Anybody could help me ? Thanks in advance.

Can you give us the 4-digit type number (53xx or 55xx) ?

Martin

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