Beogram 6500 output issues

10 replies
AL
Offline
alf
Bronze
Posted January 4, 2025 at 09:48 GMT
#1644311
Hi All,

i am struggling with my Beogram 6500 turntable, no output signal at all.

it looks like the RIAA board is ok and the cartridge is fine which led me to believe the mute switch

might hung itself?

i disengaged the little spring which helps the leaver to push or release that switch so it is now open but still
no sound.

the RIAA board is getting supply voltage…..so, what else could it be ??

would some of you have any pointers for me what else to check ?

that would be great, thank you

ALF
DI
Offline
Dillen
BronzeModeratorFounder
Posted January 4, 2025 at 16:14 GMT
#1668004
Which amplifier are you using? And how are they connected?

Does the needle track the record?
Can you hear sound from the pickup cartridge itself when playing a record, if you put your ear close to it?

Martin
BE
Offline
beouser19
Gold
Posted January 4, 2025 at 16:23 GMT
#1668006
How have you test that the riaa stage is ok?

 
AL
Offline
alf
Bronze
Posted January 5, 2025 at 01:43 GMT
#1668015
Hi Martin,

thanks for chiming in 👍

Yes, the needle is tracking perfectly and I can hear it when my ear is close.

I connected it to a Beomaster 8000, first into TP1 with its 7pin input, next into TP2 with its 5pin input, next into the RCA connectors with a 5pin adapter…..all silent.

i will try the Beomaster 650o next but unlesss the wiring to the BM8000 is not compatible I wouls expect the same result ?!?

ALF
AL
Offline
alf
Bronze
Posted January 5, 2025 at 01:44 GMT
#1668016
So far I only did a complete capacitor check on the RIAA board and checked for any broken wires or suspicious soldering but not the two ICs yet.

ALF
AL
Offline
alf
Bronze
Posted January 5, 2025 at 04:09 GMT
#1668017
Hi Martin,

one thing I forgot to mention:

shouldn’t I be able to see a signal on its 7pin DIN connector pin 2 & 3

the resistance changes between those pins from about 900 ohm to 15 kohm

I connected the table to my Beomaster 7000, the data link works but still no audio signal

ALF
DI
Offline
Dillen
BronzeModeratorFounder
Posted January 5, 2025 at 17:10 GMT
#1668034
Have you tried using a different pickup cartridge?

Martin
Mark-sf
Offline
Mark-sf
Bronze
Posted January 5, 2025 at 22:05 GMT
#1668038
I would also disconnect the cartridge signal cables from the RIAA board and check the resistance between the two signal wires of both channels. Depending on cartridge it should be between 800 and 1K ohms. If it's open or shorted you've got a bad cartridge.
AL
Offline
alf
Bronze
Posted January 6, 2025 at 05:29 GMT
#1668040
Hi Martin,

good news, I swapped the fitted MMC4 for a MMC2 and bingo, the sound was back !!

to be honest, I never suspected the cartridge as stylus & cantilever look perfect and its suspension

is fine.

i wonder what happened internally ?

many thanks for  your guidance 👍

brst regards, ALF

 
AL
Offline
alf
Bronze
Posted January 6, 2025 at 05:33 GMT
#1668041
Hi Mark,

thanks to you too for your support and perfect pointer, much appreciated.

i can’t remember that I ever had a shorted cartridge…..suspension breakdown, cantilever broken, stylus dead yes, all of these but this one looks and tracks perfectly 😳

best regards, ALF
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