ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
I have a Beomaster 2400-2 which is non operational for several years. Only a red LED lights up , None of the touch controls work.
I would like repair it , but have no idea where to start. I don't have the technical Manual as well.
Is it possible to bring it back to life
Thanks
Anil
mehtaanil: Is it possible to bring it back to life
Yes.
Martin
Martin,
Hello, Thanks for assuring me. Please tell me how I should start to bring the Radio back to life
Thanks a lot for your help
We don't know how skilled you are in these matters or which tools and instruments you have at your disposal, butbasically you will have to take a couple of covers off, check things and measure around a bit.
If none of the touch fields are working, you could start by checking if the Beomaster was put together correctly.If not, there's a good chance the sensor pads little bronze forks aren't gripping their respective pins on the underlyingcircuitboard.All fine but still no go? Check the low voltage power supply for amount of ripple and put an oscilloscope to thesignal from the sensor pad circuits oscillator to see if things are as expected.
In short; Put the patient on the bench with your tools and instruments, study the schematics, - diagnose and repair.
As you work your way around the Beomaster and get things to work, you will most likely find that a more thorough replacement ofcapacitors will be in order. some will probably be bad and most will be marginal by now with a loss of capacitance and increased ESR.Alignment trimmers will also be in need of replacement and realignment.The idle current settings in particular - so keep an eye on them if you get the Beomaster to power up, a multimeter (or perhaps two) across theemitter resistors would be fine if your variac doesn't have mains current monitoring.But get it working first - or at least sort of.
Take some pictures too......worth a thousand words
Your ideas are a ray of hope, While I did my soldering & instruments practice in engineering school about 35 years ago. I still feel I could find my way around.
I have a multimeter with me , however no scope, will it be a serious handicap?. You have mentioned changing the capacitors,How do I identify the capacitors rating , is there some readily available list which I can check off.
With the Low Voltage Power Supply, is there any particular voltage to look out? at some TP
And yes I will keep coming back to you if I get stuck somewhere, hope you don't mind.
yes Sir
mehtaanil: How do I identify the capacitors rating , is there some readily available list which I can check off. With the Low Voltage Power Supply, is there any particular voltage to look out? at some TP Thanks
How do I identify the capacitors rating , is there some readily available list which I can check off.
The servicemanual springs to mind as the answer to both.And most caps have their basic specs stamped on them.
Capacitor kits are readily available - but a completely dead Beomaster will most likely not be down to bad capacitors, so I suggest youdo some diagnosing before upgrading/recap'ing.There's always a risk of introducing new faults that would be difficult to find with the original fault(s) still around.
Could I get the manual , so U can refer to it
Hi Martin,
After weeks of fiddling around, I have see that the capacitors C58,60,62,64 are showing shorted, What do you advise
Needs a Nickname:I suggest a full recap with new idle and bias trimmers. Many of those red caps are probably way out spec. Fantastic receiver when it's all done.
Needs a Nickname is right, but as Martin suggest, get the manual, available for silver and gold members onsite, the failing capacitors will not induce a totally dead BM so go looking for more failures (transistors, rectifiers, diodes etc. etc.) before you change caps.
@ Peter: For a nickname I suggest Saint Peter or Beosaint
Collecting Vintage B&O is not a hobby, its a lifestyle.
Many thanks, for your leads, I will sit on it once again over the week end and see if this short is due to some neighbouring Resistor or any other item .
Meanwhile if you think of anything , do let me know.
Hello Martin,
I am also refurbishing a Beomaster 2400 (Type 2901), and am looking for a capcitor kit. Do you know where I might locate one?
Ottar
Capacitor kitLamp kitPotentiometer repair kitOther parts...
Email or PM me.