CD-4 decoder distorted sound

3 replies
M(
Offline
mirauta (archived2)
Bronze
Posted March 25, 2017 at 22:42 GMT
#2083007

Hello!

My BeoGram 6000 type 5512 sound distorted ONLY when CD-4 switch is ON.
I tested with 4 different cartridges (2 x MMC 4000, MMC 5000 and MMC 6000) and different records but the results were the same.
That happened when plays CD-4 record and sometimes when plays stereo record and CD-4 decoder is automatically activated (the 4CH lamp is glowing) by a certain frequency value of musical sound for example the sound of cymbal.
After cymbal's performance the sound on stereo record is clear and the 4CH lamp is shut down.
Please help me if anyone knows about that.

Best regards,
                         Catalin.

Peter
Offline
Peter
Gold
Posted March 26, 2017 at 16:55 GMT
#2083008

If you are playing stereo records, you need to switch the CD4 decoder off. CD4 records use a carrier frequency that activates the CD4 decoder and certain stereo signals will trigger this. 

My B&O Icons:

BeoCenter-9500.png BeoCenter-9500.png
Beoremote-Beo4.png Beoremote-Beo4.png
Beovox.png Beovox.png
Beovision-11.png Beovision-11.png
Beotime.png Beotime.png
Beosound-Stage.png Beosound-Stage.png
Beosound-Moment.png Beosound-Moment.png
Beosound-5.png Beosound-5.png
Beosound-2.png Beosound-2.png
Beoremote-One.png Beoremote-One.png
Beoplay-Portal.png Beoplay-Portal.png
Beoplay-Earset.png Beoplay-Earset.png
Beomaster.png Beomaster.png
Beolit.png Beolit.png
Beogram-400x.png Beogram-400x.png
Beocenter-2.png Beocenter-2.png
M(
Offline
mirauta (archived2)
Bronze
Posted March 28, 2017 at 20:10 GMT
#2083009

Hello!

Thank you for advice.
I thought it is about an electronic issue (some broken connections/fried resistors/bad capacitors/diodes/transistors/ICs).

Best regards,
                         Catalin

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