Beogram 4004 carrier won't return

4 replies
filip_kbh
filip_kbh
Bronze
332 posts
Posted February 17, 2024 at 08:51 GMT ? Edited May 4, 2024 at 19:27 GMT
#688648
I have a Beogram 4004 with two problems:
  1. Reaching the ES, it lifts the arm but the carriage does not return. Also when pressing stop, it lifts the arm but you cannot use the stop button to return the carriage. The > button works fine. In the service manual it says to repair the switch if the carriage does not return but since the stop/off button can also not make it return, I think it is not the switch that is the problem.
  2. The platter motor does not work after someone previously connected it to the LED connector. I have taken it apart and measured that the coils are good and also there was one of the three small snubbers on top of the motors that was not okay, so I replaced all of them with the appropriate VISHAY SMAJ6.5CA-E3/61 Transient Voltage Suppressor. The motor vibrates ever so slightly but it does not turn. The motor receives around 8.6V from the board.
Any help is appreciated.

Location: Copenhagen

filip_kbh
filip_kbh
Bronze
332 posts
Posted February 17, 2024 at 22:00 GMT ? Edited February 17, 2024 at 22:18 GMT
#707675
Looks like resistor 1R54 is defect as well as TR17.

Location: Copenhagen

filip_kbh
filip_kbh
Bronze
332 posts
Posted February 22, 2024 at 00:39 GMT
#707791
Update: D31 was faulty. After changing D31 and R54, the carriage now behaves the way it should. Nice! Regarding the motor: it also started working after I pulled it apart, gave it a drop of oil (yes, I know it will not last forever) and changed the order of the small plastic discs. Now the deck was working kind of great - however, the 45RPM was not stable, and when I tapped the board with the speed relay, it would lower the speed significantly. So, I decided to take a look at the National relay. I cleaned it with a fiber pen and put on the plastic lid again. After this, the motor only spins one second - and I am not sure what to do.

Location: Copenhagen

Mark-sf
Mark-sf
Bronze
592 posts
Posted February 22, 2024 at 22:12 GMT
#707820
You should replace the relay. Beolover has a replacement at https://beolover.com/products/siemens-relay-replacement-for-beogram-4000-4002-and-4004 You can find new impregnated motor bearings at https://www.beoparts-shop.com/product/motor-bearings-set-for-beogram-4002-4004-6000-dc-motor-versions/    
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