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Electronics => Beginners => Topic started by: BluesCam on December 30, 2015, 10:13:20 pm

Title: Mackie 1402 VLZ mixer hum on main output
Post by: BluesCam on December 30, 2015, 10:13:20 pm

Hello. My 1402 VLZ Mackie mixer has immediate hum when turned on and with no inputs. I took the back off and it looks
like the power supply caps are on a separate small board that is riveted to the main board. Any idea how to separate it?
Thanks!

Title: Re: Mackie 1402 VLZ mixer hum on main output
Post by: BluesCam on January 03, 2016, 06:13:31 pm

Doah! They are tiny Allen screws! These old eyes finally realized that.

Title: Re: Mackie 1402 VLZ mixer hum on main output
Post by: Richard Crowley on January 03, 2016, 07:02:10 pm

Do ALL of the outputs hum?  That would indicate a "systemic" problem, likely failure of a power bulk filter capacitor, etc. What test equipment do you have access to?

Title: Re: Mackie 1402 VLZ mixer hum on main output
Post by: BluesCam on November 12, 2017, 12:25:05 am

Sorry I missed your reply. I think you are right. Since it is a very old mixer now, I don't want to try to repair it. Thanks for your input!

Title: Re: Mackie 1402 VLZ mixer hum on main output
Post by: Richard Crowley on November 12, 2017, 05:25:20 am

If you want to dump it, I will take it.  What scrap value do you put on it?