BEOSOUND 9500 Lower keyboard issue => doesn't work

16 replies
spassmaker
Offline
spassmaker
Bronze
Posted December 5, 2022 at 08:51 GMT
#1651313
Hi

It seems that all signals are present.

If you switch the beocenter on with the remote are the sensorbuttons working as expected?

You could compare the measured signals with the service manual page 7-8.

Pic 1: maybe a different timebase could be OK

Pic 2: ENABLE maybe a different timebase could be OK

Pic 3: KEY DATA seems to be ok

Pic 4: CLP seems to be ok

Did you measure 0 V at IC4 Pin 2 (RESET)?

What happens if you go to testmode  by short circuiting the TESTMODE contacts on board 43?
OS
Offline
osaca78
Bronze
Posted December 5, 2022 at 21:50 GMT
#1651324
Hi Spassmaker

If I switch on with the remote , only remote buttons work and LED are OK but the sensor buttons don't work

I will make the Test mode wednesday because not at home Tuesday
Thanks for your helping !

Regards
OS
Offline
osaca78
Bronze
Posted January 23, 2023 at 11:59 GMT
#1653095
Finally, the problem comes of the MM5450 on lower panel . After changed , it's OK

Regards

Stephane
spassmaker
Offline
spassmaker
Bronze
Posted January 23, 2023 at 14:03 GMT
#1653098
Hi Stephane

Never thought that this IC could be the reason , lesson learned.

Could you discribe what the cause of the problem was, e.g. PIN 21 CLP or PIN 22 SER DATA to ground? something like that?

Regards

Christian
OS
Offline
osaca78
Bronze
Posted January 23, 2023 at 21:11 GMT
#1653112
Yes, the  Pin 21 to ground which bugged the bus and prevented the 4044s from operating normally
spassmaker
Offline
spassmaker
Bronze
Posted January 24, 2023 at 08:13 GMT
#1653122
Thanks for information

Now everything is clear.

 
or
BeoWorld Gold Membership card
Join BeoWorld

Register to access the forums, reference material, and exclusive member benefits — including our monthly prize draw.

Become a Member

December 2026 Prize Draw

Gold Members Only

As a Gold member you're automatically entered into our exclusive prize draw — your chance to win iconic Bang & Olufsen products. A unique benefit of BeoWorld Gold membership, every draw brings a new opportunity to win something special.

View Prize Go For Gold