VU Meter Replacement

[xrockradio]

Hey Gang,
First, allow me to thank you for your time in reading my question!

Ok, I recently put into service a Yamaha MR1642 console. To my surprise, only 1 of 6 VU meters work. The only one working is fine...the other 5...are pegged over the red to the right and not moving.

So, my question, are these just "stuck" or do they need replaced?

All levels are within normal limits, just in case you would suggest the levels are screaming hot. LOL

Well, again, I wish to thank you for your time.

Pamela Lee
X Rock Radio
Radio Station - X Rock Radio

 

[JonSnell Electronic]

If they stay on maximum when the mixer is not powered up, then replace them and fix the cause.
If they relax and return to 0 fix the fault and leave the meters alone as they are not the fault, look around ICs with the suffix *07, eg IC207/307/407 etc.

 

[xrockradio]

Thanks for your reply.

May I request what this means, please?

" look around ICs with the suffix *07, eg IC207/307/407 etc"

Ok, we powered the console down and the VU's stayed in the hard over position.

So, it looks as if the VU's will need to be replaced.

Any direction from this point?

Pamela Lee

 

[MAAC0]

look around ICs with the suffix *07, eg IC207/307/407 etc

I believe he meant looking at the schematics or the labelling on the boards.

Ok, we powered the console down and the VU's stayed in the hard over position.

What happens if You shake them ?
They usually have a coiled spring to bring the needle to 0. Check if it is broken.
Check if the needle is bent and touching the scale.

 

[xrockradio]

When I tap on them...they will move a little to the left but not much.
I would be more than happy to check the units...if I knew how to open the console.
Yes, there are screws and yes I took them out...but something is holding the raised portion on the console in.

I guess I am just tired and didn't come to a conclusion as to how to open the console containing the VU meters.
If ya'll have a solution...please let me know.

Pamela Lee

 

[turk 182]

access is from the bottom and requires the console upside down resting on the meter bridge for the removal of two circuit boards, the input section and the meter board itself, not for the faint of heart!!


Yamaha MR1642 Service Manual (Page 15 of 22) | ManualsLib

 

[turk 182]

Ok, we powered the console down and the VU's stayed in the hard over position.

how long did you wait to see a change? i've seen meters stay "pegged" for several hours unless there's a means to drain the power supply filters.