I was about to give up on my dead BeoSound 4 today, having told my cousin that I can't fix it.

However, I plugged it in for one last time - no response other than red light, and the glass door will open for control and CD loading.  Then I used the Beo4 to press SHIFT 9 0 2 5 8 and was surprised when this opened the Service Menu - very strange because this is not how the Service Manual says that the Service Menu is entered.  (The manual says MENU GO, then 0 0 GO.)

(The SHIFT 9 0 2 5 8 sequence is actually the button sequence for Service Mode on a BeoSound 1, and possibly other systems).

Anyway, the Service Mode is the first time I have seen anything on the display.  I can scroll through options, check SW versions and faults/errors*, but when I 'test' the CD it does not respond to test commands.

I have tried reset to default settings, and although this doesn't make the system work, the next time I enter the Service Menu it goes to 'initial setup', starting with Language Selection (English).  The display then goes to ... DAB AERIAL ADJUST and just locks up with that on the display until I power down.  There is a DAB aerial attached.

I'll keep experimenting with the Service Mode but I am not sure how to proceed.

* Errors as follows - none are included in BS4 Service Manual decode list - but I'll have a look in BeoSound 1 Service Manual:

NVEM: TP_MODULE_HW_ERROR_APOS (keeps re-appearing, even if I manually clear error)

VMEM:  As above plus MLSL_STATUS_ERROR (VMEM errors are cleared by unplugging)

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Then I used the Beo4 to press SHIFT 9 0 2 5 8 and was surprised when this opened the Service Menu – very strange because this is not how the Service Manual says that the Service Menu is entered.  (The manual says MENU GO, then 0 0 GO.) (The SHIFT 9 0 2 5 8 sequence is actually the button sequence for Service Mode on a BeoSound 1, and possibly other systems).

Great work thinking out of the box, but very weird that this works. Maybe different software version did change something, but nok very smart in regards to servicing. On thing that came to mind in this regard is, could it have been updated with a wrong software? Do you have a history of it being used before not working anymore?

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NVEM: TP_MODULE_HW_ERROR_APOS (keeps re-appearing, even if I manually clear error) VMEM:  As above plus MLSL_STATUS_ERROR (VMEM errors are cleared by unplugging)

I also looked in the BS4 servicemanual but could not find anything either. Then I tried a google search, and some references to the Beocenter 2 servicemanual came up. Looking at that the MLSL_STATUS_ERROR seems to be ML related, but have different error types, so you might want to look that up to see if you can spot anything usefull. Also a thread here with a BC2 with a similar error message, but no solution /forum/general-discussion-and-questions/beocenter-2-will-not-power-up Being in the ML mindset I would suggest taking a good look at the ML connector to see if any legs are bent and touching each other. If not a survey of the ribbon cables between the socket board and the main board could be worth doing.    

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On thing that came to mind in this regard is, could it have been updated with a wrong software? Do you have a history of it being used before not working anymore?

I'll have to ask my cousin, as I am not at all sure about the history.  And, yes, the different software (at least for entering Service Mode) is very strange, so I will try to find out if it was changed.

I got a master control panel 6500, a Beocenter 7000, a Beocord 5000, a Beocord 8500, and a Beomaster 2400 along with five non-B&O tape decks and a couple receivers in a "Dude just wanted his livingroom back" $5 special. Not sure what works, I want to start in on testing and, if possible, repairing what I can. They're a tad banged up but I'd really like to see if I can inject some new life into them and get them running!

Starting on the Beomaster 2400! Any advice is more than welcome as I've never worked with this equipment before. Sounds like I'll want to start by replacing caps given its age and the blown fuse.

That's great -- wonder what the MCP 6500 was used with, given that it's not a natural pair for any of the other equipment?

There are some useful service parts available for the 2400 here:

I cleaned the volume slider on my Beomaster 4400 as it worked not only as a volume slider, but also controlled the balance. Quite difficult to get to and open up, but works like a charm again.

Hi,

Currently stripped down my Lab 6000s, I purchased these second hand many years ago. Only recently came across the degrading foam issue so figured I'd open them up to have a look, no surprises as to what I found. I have ordered replacement foam, cabinet seal kit and a replacement speaker for the poorly repaired one. Noted I've got 2 different tweeter styles, both have corresponding numbers (2404 256 32512). I'm wondering what is the correct one for these speakers, was there an upgrade over the years, been advised the right hand one is the one they would have been supplied with. Does it matter they are different, ideally I'd like them to be the same type, you understand, so I can sleep at night. Any help on this is greatly appreciated.

Type 6822

Serial Nos. 12190122 & 12190119

Thanks

Mike

A little bit of Beolab 2500 insulation replacement with parts from DSP. Didn't think I needed it until I checked...