[sdiy] MN3007 Chorus Acting Weird

[Richie Burnett]

What input signal are you testing it with?

-Richie,


-----Original Message----- 
From: Jacob Watters via Synth-diy
Sent: Saturday, February 15, 2025 9:17 PM
To: SDIY
Subject: [sdiy] MN3007 Chorus Acting Weird


I am repairing a Yamaha KM602 mixer, which has a builtin MN3007 circuit. The 
chorus circuit behaves a bit odd. Instead of being a modulated delay that 
causes a pitch shift, it seems to behave like an auto-pan circuit. The sound 
level increases on one side, while decreasing on the other, and alternates 
back and forth. It is labelled as CHORUS on the front panel, so that is not 
the behavior that I expected.

Is this normal, or is something wrong with the circuit?

I tried finding a pdf of the service manual online, but I was unsuccessful. 
Does anyone have the service manual and can provide some input as to how the 
circuit should work?


Thanks for your help!

Best regards,

Jacob Watters
JacobWatters.com





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