Bang & Olufsen Beomaster 2400

This beautiful piece of design from Bang & Olufsen is now 36+ years old. Some features include touch sensitive controls (pioneered on the Beomaster 1900 a year earlier), an ultrasonic remote control and 5 preset FM stations.

As with most electronic equipment, electrolytic capacitors are common points of failure. A summary of why this can happen is explained here (Aluminum electrolytic capacitor failure). Replacing these and the bridge rectifiers, also known to be a problem point, will significantly extend its useful life.

It’s quite a complicated assembly, mainly due to its compact design.

The replacements are all smaller than their 70’s counterparts and long-life versions have been chosen where possible. The rectifiers have been swapped for uprated versions.

The replaced components can be found in the table below and have been highlighted in the BeoMaster 2400 Service Manual.

B&O REFERENCETYPEVALUEREPLACEMENT PART #MFGVRATED HOURSLINK
4200098Cap100uFEEUFR1H101Panasonic50V6000 @ 105°CLink
4201065Cap10uFEEUEB1J100SPanasonic63V5000 @ 105°CLink
4200298Cap1uFEEUEB1J1R0SPanasonic63V5000 @ 105°CLink
4200296Cap2.2uFEEUEB1J2R2SPanasonic63V5000 @ 105°CLink
4200332Cap2200uFMAL202117222E3Vishay40V8000 @ 85°CLink
4200097Cap220uFEEUEB1E221SPanasonic25V5000 @ 105°CLink
4200100Cap22uFEEUEB1H220SPanasonic50V7000 @ 105°CLink
4201061Cap4.7uFEEUEB1J4R7SPanasonic63V5000 @ 105°CLink
4200092Cap47uFEEUFR1J470Panasonic63V5000 @ 105°CLink
4200305Cap5000uFECOS1VP682CAPanasonic35V3000 @ 85°CLink
4200109Cap470uFEEUFR1C471Panasonic10V6000 @ 105°CLink
8310275B.RGSIB2520-E3/45Vishay / I.RLink
8300277B.RVS-KBPC602PBFVishay / I.RLink
5370174Pot220RCB10LV221MTycoLink

19 thoughts on “Bang & Olufsen Beomaster 2400”

  1. I have a 2400 that generally works well on radio or tape. But when I play a record, it gets really distorted after playing for short time. I’m assuming that something is broken in the preamp circuitry. Does this make sense? Would it likely be a full teardown as described in this post?

  2. Hello people,
    Hope everyone is keeping well during this Covid time.
    I have a beomaster 2400 and have one channel not working. I’m wanting to check the fuses first but I’m only finding 1 fuse, I thought there were 3 of them in total.
    Can anyone advise me we’re and how to get at the other two 2A 250v are.
    Thanks in advance.

  3. Hi,

    Thanks for doing this. Capacitor voltages: I have mountains of new 50V electrolytic capacitors. I see that you reference list shows 63V throughout. I do not see any voltages near that in the circuit, correct? I assume that 50V would work fine, right? best regards, Bo

  4. Hello-As anyone had trouble with, and suggestions for 1970’s Beomaster 2400 not holding radio channels and skipping between them. Also, while the turn table is playing, it will skip to a radio station. Any thoughts??

  5. Hi Oliver-
    1 have 2400, but the left speaker channel is not working, so I can not get a stereo. When the speaker is connected to #1 speaker or 32 speakers on the left, there is no sound. After adjusting the balance, it will only generate the sound at the top of the balance adjustment control.

    Is there a way to fix the left side, yes. Is there a fuse that is broken or is it something else?

  6. Hey Oliver,
    looks like you are very tech savvy!

    Are you also familiar with the Bang & Olufsen Beolit 12?
    I was wondering if a specialist like you could give me a hint on this problem:

    Everytime I plug that speaker into the power outlet, I have to manually turn on the speaker by its power on button. After this, I have to wait until it booted to turn on the wifi. Which is very annoying.

    My other Bang & Olufsen speaker, the A8, boots up and starts wifi once I plug it into the power outlet.

    Is this also possible for the Beolit 12 with some of your hacks?

    Kind regards,
    Stefan

  7. Hello Oliver. Thank you for posting your experience and especially for providing the conversion table.

    I currently have a beomaster 2400 lying around that “has not been functioning properly” as in it’s sound is off (buttons and lights are fine). I suspect this to be the capacitors. Preferably I’d just order all the replacement parts as a ‘kit’ and take the machine apart only once to replace every capacitor in it. However, to do this I’d need to know the number of capacitors I’ll have to order. Do you happen to know how many of each capacitor you replaced?

    Thank you in advance.

  8. I have taken the Beomaster 2400 covers off. Then i plugged it in and using a pair of headphones I can hear the FM radio playing, but at low volume. As stated above, I can switch between the channels and functions (phono and tape) by touching the pins that the copper “springs” usually touch. BUT the pins that control the volume up and down are completely unresponsive. I went through the board on which the volume (up and down) pins reside and reflowed a number of the soldering points, though seeing none that were obviously flawed.

    The sliders work well and responsively asI’ve used some Fadbrlube on them. .

    Any suggestions beside replacing ALL the caps on the Beomaster? How much does a “capacitor kit” cost?

  9. Great Blog Oliver. I bought a Beomaster 2400 at a garage sale for ten bucks. I cleaned it up as it was filthy, it looks okay now. When you switch it on, the power light turns on. The problem is that when you touch the pad to choose a function, the display lights up, then shuts off. The only thing you get is a click when you go down the functions…If you wait a bit…it will resume the display problem. Any ideas?…..Thanks, Joe.

    1. I followed the service manual, linked in my post above which is a pretty good guide. It’s fiddly and need a bit of patience though. Good luck!

  10. Hello I recently acquired a Beomaster 2400 and the FM 1 does not light up, or when pushed turn off any other FM that is lit up. What is the easiest fix?

  11. Solder all suspect joints. Those diode bridges don’t fail as much as the solder joints on them do. Thick leads and heated thru use. There are these signs that you can use to find suspect joints. External jacks that are mounted on the circuit board, another failure point. Still have the cassette deck somewhere, it is 12 volt internally you could put it in a car.

  12. What would the most likely cause of a Beomaster 2400 taking several minutes to warm up? Until the unit warms up the unit hums.

    Thank you,
    Marc

    1. Hi Marc – The two large 5000uF capacitors in the power supply (see part #ECOS1VP682CA). The whole unit is quite awkward to take apart – good luck!

  13. Hello Oliver, I spotted your link on the B&O Facebook site regarding this recent repair of yours to the 2400, most impressive! I own the 3500 which looks very similar on the inside. Recently I blew something like a fuse while attempting to insert my headphone jack when a CD was still playing (silly move I know, now!) anyhow I had hoped it would be an easy task replacing the ‘blown fuse’.. well I’ve only found 3 fuses and they all appear to be ok. Do you by any chance have a suggestion as to what else it might be I could look for? I’ve had the Beomaster hooked up to a nice pair of powered BeoLab 2500’s so unless they have something installed which might have blown?… or the Beogram CD3500 itself?
    Any worthwhile suggestions or links to further information would be greatly appreciated, heres hoping:)
    Kind regards
    Wayne Gibson
    PS: also the internal Din plugs connecting to the Phono & CD leads seem a little fragile (only one Phono channel working) so I’m keen to track down a source for replacement Din sockets also.. cheers.

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