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
First Im new to this forum and I want to express my appreciation in advance, of any and all help I may receive - it really is kind of anyone to give there time and knowledge freely, thank you to all who do!
I have just started collecting 70's B&O Equipment but ended up with a MCL 2P along the way. Obviously "out of the box" this is of no use to me - i need to trigger the auto on.
Now as far as I can find out this is a Voltage on pin 4 of + 2.5v - 5v and - to Ground on pin 7. I have applied 4.5v from a pack of 3 x AAA (new) with no joy.
All internal fuses are checked as OK. There is no obvious internal re-wiring. But I get zero in terms of output. I take it this means it is not powering up BUT...I must point out the led is permanently lit red, I can not find if this is the "ON" or "Standby" mode.
Q) Does the red led indicate on or off?
Q) Is my pin data (2.5-5V P4/P7) correct?
Q) Is it going in the recycling bin?
StuckInBulgaria: Q) Does the red led indicate on or off? Yes. Red means off, green menas obvious on Q) Is my pin data (2.5-5V P4/P7) correct? Try pin 2 instead of pin 7 Q) Is it going in the recycling bin? Why? These are repairable
Yes. Red means off, green menas obvious on
Try pin 2 instead of pin 7
Why? These are repairable
Beobuddy: StuckInBulgaria: Q) Does the red led indicate on or off? Yes. Red means off, green menas obvious on Thank You - I am not used to things having a light to tell you they are off - LOL. But i did suspect it may change to green Q) Is my pin data (2.5-5V P4/P7) correct? Try pin 2 instead of pin 7 Will Try - Thank you Q) Is it going in the recycling bin? Why? These are repairable I'm English, I live in Bulgaria. Things that are easy and normal in the rest of the world take on a special kind of "near impossible" here.
StuckInBulgaria: Q) Does the red led indicate on or off? Yes. Red means off, green menas obvious on Thank You - I am not used to things having a light to tell you they are off - LOL. But i did suspect it may change to green Q) Is my pin data (2.5-5V P4/P7) correct? Try pin 2 instead of pin 7 Will Try - Thank you Q) Is it going in the recycling bin? Why? These are repairable I'm English, I live in Bulgaria. Things that are easy and normal in the rest of the world take on a special kind of "near impossible" here.
Thank You - I am not used to things having a light to tell you they are off - LOL. But i did suspect it may change to green
Will Try - Thank you
I'm English, I live in Bulgaria. Things that are easy and normal in the rest of the world take on a special kind of "near impossible" here.
MCL "P trigger SPEAKER ON/OFF is via PIN 1, ground is PIN 2, as Beobuddy said. If you have a Beovision or a Beosound as source, it helps, when you solder a bridge in the Powerlink from PIN4 to PIN1.
You can find a lot of useful (wiring) information on the Beotech site.
Hope this helps - welcome to Beoworld.
Stefan
OK - Sorted
Im using the pin numbering as shown in diagrams and schematics from B&O - which is a little confusing. Starting bottom left and going clockwise we have, solder side on a Din plug:
6, 1, 4, 2, 5, 3, 7
On that layout MY unit switches ON with +5v at pin 1 and 0v to any ground.
On the schematic pin 1 is shown as unused.
As far as I can tell I have:
Pin 1 = Power link on with + 5vPin 2 = Signal Ground Pin 3 = Left inPin 4 = Poss Speaker mute?Pin 5 = Right inPin 6 = Poss Data?Pin 7 = Ground to chassis Pin 8 = Poss Overload?
However it does switch on with one heck of a thump - I guess this is what the speaker mute is for. So I need to configure a the position switch so it goes
Standby - Speaker mute
Power on - Speaker mute
Power on - Active speaker
This is to be driven alongside a Beomaster 1400 for now, volume modulation is done via the source.
Just to say a thank you to people - who offered advice. Especially Stefan - why the schematic i had had pin 1 as unused I dont know but it was the one i would never have tried if Stefan had not mentioned it.