MOTM

Hey, this means I won't be alone in the next couple of nights of
troubleshooting *my* recently-built 300.

Mine seems fine except that the sine and tri wave outputs are weak and
buzzy; I haven't been able to calibrate it yet, so maybe that will put
things right. Life can really get in the way of building/calibrating
modules--what a pain! ;)

David.


> -----Original Message-----
> From: bruce@... [mailto:bruce@...]
> Sent: Thursday, February 22, 2001 1:47 AM
> To: motm@yahoogroups.com
> Subject: [motm] Question about MOTM-300 Troubleshooting guide
> 
> 
> I have a question about the troubleshooting guide in the back of the 
> MOTM 300 instructions.
> 
> The third check box has several lettered steps.  Step (b) says to 
> check the VX voltage, and make sure it is close to +4.8V, and 
> mentions 
> the right side of R3.
> 
> Looking at the schematics, it looks like R3 is involved in the fine 
> tune voltage, whereas R37 is closer to where one might find VX.
> 
> Comments?
> 
> Oh yeah, I have an MOTM-300 that is not playing nice at the moment.  
> All of the voltages seem to check correctly (with the exception of VX 
> as noted above), now it is down to verifying that all of the 
> components are in the right spot...
> 
> Part of me is wondering about O-Scopes and if that might help me find 
> the trouble sooner.  There is no sound at all out of the module, 
> except from the pulse jack, if I turn the coarse tune knob to 
> just the 
> right spot, it outputs noise that can be changed by moving the PWM 
> pot.  8-)
> 
> Wahoo! (translation: this should keep me occupied for the next couple 
> of nights)
> 
> Bruce
> 
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