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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