I will have to service 10 of these amps
these are almost 10 years old and probably from the first class D amps that Crown produced
These amplifiers have been operating for the latest 10 years they have been actually powered on for 10 years even though signal was passing from them only afternoon hours between 16.00 till 21.00 for 3 shows per night of about 1.5 hours each .
The specific amps also worked inside a filtered and air conditioned booth with a steady temp of 21 degrees inside .
the level used was often just a bit close to 0db no clip or over drive at no time Load was easy 8 ohms per ch ...
I will check all the big capacitors for any signs of problems and probably replace them all
I see as a problem small electrolytics of smd type to be an issue and i will have to find out what is also happening with them ...
As we speak all amplifiers are working while the costumer wonders either to service them or replace them .
Any suggestions ?
these are almost 10 years old and probably from the first class D amps that Crown produced
These amplifiers have been operating for the latest 10 years they have been actually powered on for 10 years even though signal was passing from them only afternoon hours between 16.00 till 21.00 for 3 shows per night of about 1.5 hours each .
The specific amps also worked inside a filtered and air conditioned booth with a steady temp of 21 degrees inside .
the level used was often just a bit close to 0db no clip or over drive at no time Load was easy 8 ohms per ch ...
I will check all the big capacitors for any signs of problems and probably replace them all
I see as a problem small electrolytics of smd type to be an issue and i will have to find out what is also happening with them ...
As we speak all amplifiers are working while the costumer wonders either to service them or replace them .
Any suggestions ?
Keep them. There is no reason to replace them unless your customer wants more power, or smaller amps.
I would make sure all the power devices have a fresh layer of thermal compound. Replacing caps never hurts and the smd caps are the worst because they are very prone to leaking...at least the ones from that era. IIRC, there are a lot of those on the board so it may take a while.
Also, there is a little daughter board off to the side, make sure that the power device on that board has good compound and all of the pins are cleaned. It can cause the whole amp not to work.
I would make sure all the power devices have a fresh layer of thermal compound. Replacing caps never hurts and the smd caps are the worst because they are very prone to leaking...at least the ones from that era. IIRC, there are a lot of those on the board so it may take a while.
Also, there is a little daughter board off to the side, make sure that the power device on that board has good compound and all of the pins are cleaned. It can cause the whole amp not to work.
Thanks for the info really useful
Well the choice keep them or get new ones is not mine the costumer will decide after all .
Will keep this in mind
Thank you
Well the choice keep them or get new ones is not mine the costumer will decide after all .
Will keep this in mind
Thank you
They have been working 24x7 for 10 years! That is quite some good reliability there. You know what they say, "if it aint brroke, don't fix it." 🙂
"if it aint brroke, don't fix it."
I have been referring to this expression before and i find it as the most childish thing i heard in my life ...
Especially in amplifiers that they may produce music while having a million of stability problems ..
Sorry
Not for me
I have been referring to this expression before and i find it as the most childish thing i heard in my life ...
Especially in amplifiers that they may produce music while having a million of stability problems ..
Sorry
Not for me
= broken
Hey, I was just joking... 🙂
Seriously, that is still some great reliability and anything running that long needs mechanical cleaning of dust bunnies, look for bulging caps, discolored resistors, and do a smell test to see if you detect something acrid or burnt like hot bakelite, pvc, etc.
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