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
hi i have a pair of mk1 penta speakers 1988 i have tried to get into the amp but can find no way in ,the amp is not coming on ,i have checked all the obvious avenues like the fuses so it must be internal ,i've removed the amp from the speaker but cant seem to see how you get the amp out from casing can any one help me please. cheers debs
someone must know how to get the amp out of the casing !
The short answer is, you don't.Normally all service can be done while the amplifier is inside the case, which actually doubles as cooling fin.Taking off the bottom and the top will allow access to most parts.
Martin
thanks for that but how can you see if there are any loose joints or test caps if you cant get in ,it must come out to be able to replace certain parts!
Maybe these pictures can help you to see how it looks like when the amp has been dismantled.
(link disabled)
Brengen & Ophalen
Generally speaking, you don't fault find or repair items by pulling everything apart! If for instance the amp is blowing fuses, you would put on a variac or use a bulb to limit current, then take measurements with a meter, which as Martin suggested above is easy enough with the bottom plate removed. I guess you checked the 40mA fuse?
Olly
Step1:Generally speaking, you don't fault find or repair items by pulling everything apart!
Well I did!
I'm sure it's interesting for some to see how these things looks like completely dismantled!
Leslie I wasn't attacking you in any way! I am just saying it isn't the best way to do things and running the amp without heat sink is a big no no... They were interesting pics I have never seen the board out like that despite loosing count of the number of pentas I have looked at lol!
HI THANKS FOR ALL THE HELP I AM COMPLETELY IN THE WORLD OF THE UNKNOWN , I THOUGHT I COULD LOOK INSIDE AND FIX IT , HOW STUPID CAN I BE, THE PICS SCARED THE HELL OUT OF ME, I DONT KNOW WHATS WRONG WITH THE AMP BUT IT SEEMS FROM READING OTHER PEOPLES PROBLEMS WITH PENTAS THAT THE AMP IS CLIPPING OUT , IF THATS THE CORRECT TERM TO USE, IT WOULD NOT COME ON THEN IT WOULD HAVE A RED LIGHT THEN GREEN AND NOW AMBER OR YELLOW,DO I NEED TO GET B & O TO REPAIR IT AS I NOW KNOW I CANT, OR IS SOME ONE ABLE TO GIVE ME A PRICE AND I CAN SEND IT TO ONE OF YOU FOR REPAIR.
THANKS FOR THE ADVICE DEBS X
Yes if the amp is showing a delayed fault it is likely the idle current that is out, if you tell people where you are then we can point you in the right direction.
YEAH I AM IN ASHFORD KENT UK
THANKS