MOTM

From: Nathan Alan Hunsicker <nate@...>
To: MOTM Newsgroup <motm@egroups.com>
Sent: Monday, May 08, 2000 7:03 PM
Subject: [motm] Thank God!!!


> I finished building my 410 today. After replacing that pesky TL074 op
> amp I put in backwards, I was ready to power up the module and test it.
> When I connected it to the power supply and turned it on, everything
> stopped working, the light on my LFO was showing a dim green and was not
> oscillating. Of course I immediately turned the PS off and disconnected
> the 410, powered back up and everything works fine. Now I'm thinking
> something is shorted out so I take one last look at EVERYTHING, not one
> thing wrong (except for a resistor not facing the same way as the
> others.) my next thought was does my PS have enough power to run all my
> modules? I only have a 300, 320, 110, 120, 420, 410 & three 800's, it
> couldn't possibly be the PS, but just in case, I disconnect one of the
> 800's and try again, SUCCESS!!! So now I'm thinking I need another PS as
> I prepare the module to put in my rack, I plug it back in, bolt it to
> the rack rails, power up and WHAMMO, it happens again. I'm totally lost,
> just as a last resort I try switching the MTA cable to the one that was
> powering the 800 and it works! For some reason, when the bad MTA cable
> is not connected to a module, it is fine, but as soon as I connect it to
> a module (any module) it shorts out. I am so glad that it was the cable
> and not my module. NOW, what was the reason I typed all of this you ask?
> Just in case you build a module and can't figure out why it doesn't
> work, don't forget the obvious, test the power cable. -Nate
>
> ------------------------------------------------------------------------
> You have a voice mail message waiting for you at iHello.com:
> http://click.egroups.com/1/3555/5/_/529958/_/957831275/
> ------------------------------------------------------------------------
>
>

> Sure it wasn't a bad '800?
>
> Check the wiring on the cable. I have seen 1 (out of ~1000) cables
> that had
> the 2 outside wires 'crossed'. I now try to check for this as I pack
> them
> up.
>
> Paul S.
>
> ----- Original Message -----
> From: Nathan Alan Hunsicker <nate@...>
> To: MOTM Newsgroup <motm@egroups.com>
> Sent: Monday, May 08, 2000 7:03 PM
> Subject: [motm] Thank God!!!
>
>
> > I finished building my 410 today. After replacing that pesky TL074
> op
> > amp I put in backwards, I was ready to power up the module and test
> it.
> > When I connected it to the power supply and turned it on, everything
>
> > stopped working, the light on my LFO was showing a dim green and was
> not
> > oscillating. Of course I immediately turned the PS off and
> disconnected
> > the 410, powered back up and everything works fine. Now I'm thinking
>
> > something is shorted out so I take one last look at EVERYTHING, not
> one
> > thing wrong (except for a resistor not facing the same way as the
> > others.) my next thought was does my PS have enough power to run all
> my
> > modules? I only have a 300, 320, 110, 120, 420, 410 & three 800's,
> it
> > couldn't possibly be the PS, but just in case, I disconnect one of
> the
> > 800's and try again, SUCCESS!!! So now I'm thinking I need another
> PS as
> > I prepare the module to put in my rack, I plug it back in, bolt it
> to
> > the rack rails, power up and WHAMMO, it happens again. I'm totally
> lost,
> > just as a last resort I try switching the MTA cable to the one that
> was
> > powering the 800 and it works! For some reason, when the bad MTA
> cable
> > is not connected to a module, it is fine, but as soon as I connect
> it to
> > a module (any module) it shorts out. I am so glad that it was the
> cable
> > and not my module. NOW, what was the reason I typed all of this you
> ask?
> > Just in case you build a module and can't figure out why it doesn't
> > work, don't forget the obvious, test the power cable. -Nate
> >
> >
> ------------------------------------------------------------------------
>
> > You have a voice mail message waiting for you at iHello.com:
> > http://click.egroups.com/1/3555/5/_/529958/_/957831275/
> >
> ------------------------------------------------------------------------
>
> >
> >
>
> -----------------------------------------------------------------------
>
> -----------------------------------------------------------------------
>

>
>
>
>In a message dated 5/8/2000 5:43:52 PM, synth1@... writes:
>
>
>
>>Sure it wasn't a bad '800?
>
>
>
>Send it to Barlow as scrap!
>
>
>
>>Check the wiring on the cable. I have seen 1 (out of ~1000) cables that
>
>>had
>
>>the 2 outside wires 'crossed'. I now try to check for this as I pack them
>
>>up.
>
>
>
>About 6 months ago(?) there were some power cables that needed a bit of
>
>tweaking upon receipt due to some less-than-MOTM-like assembly. Paul gave us
>
>a quick fix to make them up to spec (and offered to replace them if one
>
>wished), maybe you have one of those cables, eh?
>
>
>
>Last I heard, that poor MOTM cable assembler was still eating thorough a
>
>straw.
>
>JB
>
>
>
>

>
>Don't take any chances here, fix the cable correctly - you may fry
>
>something! Slide the yellow cap off one end connector and pull the wires
>
>out. Cut them off 1/2" shorter. Do NOT strip the insulation, and force the
>
>wires back down over the pins. I use needlenose pliers pressing in front of
>
>and behind the pin simultaneously. Make sure the wire is all the way in
>
>against the back of the connector when you do this. Replace the cap, and fix
>
>the other connector for good measure. Of course it goes without saying that
>
>you must replace the correct wires in the correct pins!
>
>
>
>Many of us had horrible problems awhile back when a batch of cables were
>
>made incorrectly. Cable maker was suitably chastised with a high voltage
>
>patchcord up the ying yang.
>
>
>
>Dave
>
>
>
>
>
>
>
>