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beomaster 7000 volume display question

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nitro2
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nitro2 posted on Sun, May 20 2012 4:27 PM

the volume display on my bm7000 is acting up a bit lately .

i can see bars  appearing and disappearing whilst adjusting the volume ( the rest of the display led's seem to be ok ) .

Can it be the mm5450 responsable for this ?? or are there other causes??

i have replaced the processor a couple of years ago ...................

 any info welcome

 nitro2

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solderon29
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Do you mean the display on the Beomaster,or the Master Control Panel?

Nick

Dillen
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Dillen replied on Sun, May 20 2012 5:11 PM

Or maybe on a Beolink 7000 ?

Martin

Step1
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Step1 replied on Sun, May 20 2012 5:55 PM

I think he means missing segments, as the 5450 is a serial in / led out which the 7000 uses to drive the front panel displays... Do the segments only disappear when volume changed? Maybe check the back up battery and general operation of the processor? I think the 5450's are pretty hardy chips!

Try storing a new volume level after checked the lithium battery and see if anything changes?

Olly

nitro2
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nitro2 replied on Sun, May 20 2012 6:17 PM

Hi martin ,

 it is maybe better described  " blinking  segments " on the 2   7-segment led displays.

you only see those when changing volume , so a volume of 30 will be visible with various odd segments visible or with segments missing  ( for example as 89 ) .

 it has nothing to do witn BL.

 

 nitro2

 

 

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nitro2
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nitro2 replied on Sun, May 20 2012 6:20 PM

Hi step1 ,

i have just answered dillen , please see there what is going on .

i don't understand what the lithium has to do with this serial communication or the driver to the led's .

( altough changing the lithium might also be one of the things to be done in close future ).

i will see if i can make a liitle movie of the problem.......................

 any suggestions are welcome .

 nitro2

 

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nitro2
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nitro2 replied on Wed, Jul 25 2012 3:36 PM

Hi forum ,

 Please assist me in finding the cause of the problem .....................

Now the problem gets bigger ( but maybe it reveals its cause ) .

 Not only the 7 segment led dislay ( front panel bm7000 )  is acting up , "loudn" and "radio " joined the problem ( blinking randomly ).

But another one is acting up too , the mute relay is also clicking in sequence with the display...................

 

 any info highly appreciated.

 

nitro2

 oh yes , backup battery has been replaced

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Dillen
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Dillen replied on Wed, Jul 25 2012 4:58 PM

First thing would be to replace capacitors in the power supply regulator circuits and at the processor and front panel boards.
The small ones between the cooling fin and the mains transformer are important.

Martin

nitro2
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nitro2 replied on Wed, Jul 25 2012 7:06 PM

martin ,

 thank you ,  i will ghet the tools out ( again ).

 nitro2

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tournedos
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While you're at it, also check the solderings on the front panel PCB and the connectors leading to it. I've seen a couple that did random things due to problems there.

--mika

nitro2
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nitro2 replied on Thu, Jul 26 2012 1:06 PM

martin ,

 

where to find the test point 4TP1 ??

i cannot find it marked in the silkscreen on the processor pcb .

 

nitro2

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nitro2
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nitro2 replied on Thu, Jul 26 2012 2:39 PM

martin ,

 Replaced all i could see as suspicious ( not all components available ).

Found 4TP1 finally behind the rf shield on pin 32 of  after the r58 r 48  , went to testmode and on query 5 i got 37 as an response.

 Can you please tell me what the three does indicate ( first digit in my manual is 1 and 0 , second digit 7 should indicate all ok ) .

Powered on the unit , all display steady and as it should .

No clicking mute relay , response to bl1000 okay.

 Hooked it up to the speakers and cd player , NOTHING Sad no sound from the speakers ( total silence ).

Every source is silence , looks like a missing link between pre-amp and end-stage.

verified the mute relay again , it measures out okay , and responds to the insertion of a headphone.

ofcourse headphone is silence too.

i can hear the famous power-on click in the speakers and headphone .

 So i started measuring voltage levels , all seem to be okay.

I did not touch anything except for the wires to the processor board , and the display board.

I replaced the processor ( with a new one ) , same result.

 i am a little confused here ...................Embarrassed

 

 

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Dillen
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Dillen replied on Thu, Jul 26 2012 3:46 PM

Check if you inadvertently pulled a plug somewhere.
Maybe the amplifier input  or something on the processor module.

Martin

nitro2
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nitro2 replied on Thu, Jul 26 2012 4:22 PM

Martin ,

an little addition to the list ;-)

- 2 way communication gone too................................any help there welcome.

2 processors give the same results.

bl7000 and bl5000 ( 2 of those ) say no connection , i assume it must be processor or front panel related................not happy.

any idea on the result " 37 " in diagnosis number 5 ?

 

--> But the good point is that i got the unit sound-wise back alive , cd playing on the background   ALL THANKS for your INPUT !!

Not quite sure what caused the silence , but i resoldered most of the points and there is was ..................sweet music ( after 2 days of a silent house ).

 

nitro2

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Dillen
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Dillen replied on Thu, Jul 26 2012 7:10 PM

Did you reset the NVRAM settings ?

Martin

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