ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hello all,
without any special reason my 3300 stopped working correctly. Actually plays through CD/Tape & Phono inputs but after about 5 minutes from turning it on. Radio does sound but noise only also after the same time.
I checked the forum and replaced the two 6800uf capacitors for new ones and checked c67 & c68 also.
Any help would be greatly appreciated.
Thanks!
Josep
Beocenter 3300 does not have a CD input.If this is instead a Beomaster 3300, check the voltages from the power supply when cold.- Ripple frequency in particular.
Martin
Sorry! Beomaster. Edited!
Dillen: Beocenter 3300 does not have a CD input.If this is instead a Beomaster 3300, check the voltages from the power supply when cold.- Ripple frequency in particular. Martin
Sounds like a cold solder too!
Any ideas where to search?
Beo_Jean: Sounds like a cold solder too!
joerenfield: Any ideas where to search?
Did you read/try what I suggested?
Hi yes about voltage 24.5v which seems correct, but I don't have the knowledge to check the frequency... :(
Put a scope on the supply rail.
There's a 5V, a 10,2V, a 15V, a 31,5V, a -33V and two 33V.Which one measured 24V?
I will test again later, I will also search for the bad solder joints.
Dillen: There's a 5V, a 10,2V, a 15V, a 31,5V, a -33V and two 33V.Which one measured 24V? Martin
Check the rail providing power to the common failing inputs and start from there. Weak solder joints are difficult to see, you may just want to redo them. Especially check the jumpers and piggy connectors...
I have re-done many suspicious solder joints but no improvement. Seems to slowly be dying. Yesterday 5 minutes and today takes about 15 minutes to play since power on...
Beo_Jean: Check the rail providing power to the common failing inputs and start from there. Weak solder joints are difficult to see, you may just want to redo them. Especially check the jumpers and piggy connectors...
Another question, which would be the modern replacement for the brown capacitors like the one photo? From the service manual they are 22nf 40v but I don't seem to find this values in electrolytic capacitors.
What was 22nF in year 1990 is still 22nF,but I see no brown capacitors in that photo (?)And unless physically damaged I wouldn't suspect capacitors in that range.
I mean this dark red type.
Can you address me to where I can buy this type of capacitors?
joerenfield: I mean this dark red type. Can you address me to where I can buy this type of capacitors?
Martin is selling cap kits but you can get replacement from Mouser, Digikey and other places.
Personally, I would use a Nichicon UPW 68uF 63V -->
Oh BTW,
Replace all the red caps while you are there, they are nasty!
Even if technical manual says 22nf?
Thanks!!!
Beo_Jean: joerenfield: I mean this dark red type. Can you address me to where I can buy this type of capacitors? Martin is selling cap kits but you can get replacement from Mouser, Digikey and other places. Personally, I would use a Nichicon UPW 68uF 63V --> UPW1J680MPD1TD
joerenfield: Even if technical manual says 22nf?
Of course not!- And it doesn't!2C67 is 68uF - that's the red Roederstein in the power supply - the one visible in the photo.It's 1C67 that is 22nF - that's in the tuner...
Don't get me wrong, I mean the very best, - and safest, for both you and the Beomaster, but are you sure, repairing this is a task for you?I have a lot of respect for people wanting to have a go at DIY, but I have even more respect for people realizing when the job is betterleft with someone else, - someone with the skills and knowledge to do it right.
got confused reading the technical manual. Supposed only one C67 was in the Beomaster. I have dismantled it and mounted again about 10 times in the last 6 days... I have the knowledge to soldering and unsoldering components and checking capacitors... Anyway I'm going to give up and buy a new unit, I don't get a clear idea of the problem.
It's a very specific problem but I suppose it can come from anywhere. Was working perfectly 10 days ago! Now each time takes longer to play through CD input and no radio signal, only noise. It takes about 30 minutes. After that the sound is clear and powerful.
Dillen: joerenfield: Even if technical manual says 22nf? Of course not!- And it doesn't!2C67 is 68uF - that's the red Roederstein in the power supply - the one visible in the photo.It's 1C67 that is 22nF - that's in the tuner... Don't get me wrong, I mean the very best, - and safest, for both you and the Beomaster, but are you sure, repairing this is a task for you?I have a lot of respect for people wanting to have a go at DIY, but I have even more respect for people realizing when the job is betterleft with someone else, - someone with the skills and knowledge to do it right. Martin