Vintage HiFi Audio Forum

Repair / Help Forum => Repair / Help => Topic started by: gdv on November 28, 2019, 10:54:27 AM

Title: Mackie HR 824 Studio Monitor...
Post by: gdv on November 28, 2019, 10:54:27 AM
Again, Happy Thanksgiving....

My brother & I were talking this morning about his repair issue...

If anyone has any insight or experience, replies would be greatly appreciated...

Thank you so much for considering.... 
George


Mackie HR 824 Studio Monitor will not turn off when in the auto off mode.
Have tried cleaning all switches and pots and this worked for a couple of days for one of the units.  Re-cleaning switches again has not helped.  One of the Mackies has a rear heat sink which gets quite warm when it fails to power off.  Help is needed...
Title: Re: Mackie HR 824 Studio Monitor...
Post by: MacGeek on November 28, 2019, 11:47:55 AM
Might there be a signal leaking to it?
Title: Re: Mackie HR 824 Studio Monitor...
Post by: gdv on December 02, 2019, 09:16:08 AM
One "bump" into December...  :)

Hope everyone had a great Thanksgiving...


George
Title: Re: Mackie HR 824 Studio Monitor...
Post by: rgpit on December 02, 2019, 11:15:01 AM
George,

Does this still happen if the speaker is disconnected from any input? Can you hear any hum or high frequency oscillation in the bad unit?

Ron
Title: Re: Mackie HR 824 Studio Monitor...
Post by: gdv on December 02, 2019, 12:08:14 PM
Klaus & Ron, thanks for comments...  Will pass on to my brother for response...

Thanks again...
George
Title: Re: Mackie HR 824 Studio Monitor...
Post by: gdv on December 02, 2019, 02:25:54 PM
Reply from bro...

No signal; input disconnected

No Hum  or audible hi freq  Have not checked it with a scope for >20khz freqs

Title: Re: Mackie HR 824 Studio Monitor...
Post by: MacGeek on December 02, 2019, 03:52:57 PM
So, it still fails to power off when disconnected from a signal source?
Title: Re: Mackie HR 824 Studio Monitor...
Post by: gdv on December 02, 2019, 04:17:06 PM
Correct...
Title: Re: Mackie HR 824 Studio Monitor...
Post by: MacGeek on December 02, 2019, 04:23:00 PM
I am no tech, but a stab in the dark leads to a possible bad sensor