M3 perucssion - no decay & reset.

[Model E & Me]

Re: M3 perucssion - no decay & reset.

[quote user="johnny b3"]


...I don't know what happened but I ended up blowing out my test probe leads a large blue zap and some sizzle and smoke. I thought at first the meter was fried (I realized the + meter lead was not plugged in the correct location - 10A instead of VOmA) however now i'm checking and the meter is fine, and neither test lead has continuity. </P>


[/quote]</P>


An ammeter has very low impedance, since it is placed in series with the circuit. Since you had your multimeter connected as an ammeter, what happened was that you put a direct short circuit across the 120 volt power and the test lead conductors burned off before the circuit breaker in your service panel tripped. You were lucky - the outcome was better than it could have been.</P>

[johnny b3]

Re: M3 perucssion - no decay &amp; reset.



[quote user="Model E &amp; Me"]</p>

An ammeter has very low
impedance, since it is placed in series with the circuit. Since you had
your multimeter connected as an ammeter, what happened was that you put
a direct short circuit across the 120 volt power and the test lead
conductors burned off before the circuit breaker in your service panel
tripped. You were lucky - the outcome was better than it could have
been.[/quote]</p>

Thanks for explaining. I did notice the fuse was still good inside the meter...Glad I didn't didn't do harm to the service panel (or to myself)! A new page has been written in my book of common sense.
</p>

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[quote user="geoelectro"]</p>

Should be blue and gray. Hey! Be careful dude! [:O]
</p>

George
</p>

[/quote]</p>


It looks like Blue and Gray are Un-switched, by the schematic I would guess that they are live even if the organ has not been turned on. Brown looks like it becomes live when the Run switch is activated. Or am I reading this wrong...</p>

And I'll be careful! (Think I always am...just got rushed yesterday, I suppose. Won't let that happen again.)</p>

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[geoelectro]

Re: M3 perucssion - no decay &amp; reset.



Were you talking about the cover on the generator? I was talking about the cover on the amplifier. This is where kits are usually connected. The amplifier is switched of course. [;)]</p>

George
</p>

[johnny b3]

Re: M3 perucssion - no decay &amp; reset.

[quote user="geoelectro"]

Were you talking about the cover on the generator? I was talking about the cover on the amplifier. This is where kits are usually connected. The amplifier is switched of course. [;)]</p>

George
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[/quote]</p>

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I was also talking about the cover on the amp. There are 3 terminals. One is AC Neutral (GY), and connects to the amp transformer. The next is AC Hot (BL), which is connected to the Run switch, which is returned to the amp via BN, which connects to the other side of the transformer, powering up the amp. So there are 2 live terminals and one off, while the organ is off. According to that schematic GY and BN should be used, no? I'm using the tester just to be 100% sure...but I wanted to know if i'm reading the schematic right.

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[geoelectro]

Re: M3 perucssion - no decay &amp; reset.



Oh, I see. I'm thinking console as that's what I work on every day. In consoles, the preamp is switched on and doesn't have mains AC going to it when off. The M-3 has mains going into it of course. Not having one here to look at, just measure AC power on the three terminals with it on and with it off. You will see how it's switched. Looks like you have it figured out already. You can clip a light bulb on the terminals you think are right and test it.</p>

Sorry for the confusion. (gotta stop thinking consoles all the time!!! Errr!)[:$]</p>

George
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[johnny b3]

Re: M3 perucssion - no decay &amp; reset.



Thanks for all the help George, everything turned out well with the organ percussion and hookup...</p>

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Now the leslie's on the fritz (145)! It plays fine for a few mins, but soon the volume almost completely diminishes. You can still hear it the organ faintly, and if you adjust the volume control on the leslie amp, you can bring it almost up to 3 o'clock (volume 8?) and still barely hear anything. If you turn it the rest of the way up you hear it a bit louder, but with horrible intermittent signal/distortion. At this point I tried my own leslie which was fine...then after about 15min I plugged the main leslie back in and it played fine again...then died soon after. I wasn't around for the first time this sound decay occurred, but the people around compared it to an organ on its death bed...just a strange, distorted, dying organ tone. I've checked and i'm positive the leslie amp is problem. </p>

Are any of the amp's components suspect?
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[geoelectro]

Re: M3 perucssion - no decay &amp; reset.



Yep, output tubes 6650's. Also, a new filter cap.</p>

George
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[johnny b3]

Re: M3 perucssion - no decay &amp; reset.

Thanks again george, case closed!

[Guest]

Hi there I have the same problem with my M3 (1959) I can`t see the letter very well on the chassis so witch one should i zap with the 9 volt dc the first wire from the percussion trim is green , brown , red,blue and two yellow thanks

[mange656]

This could also be dendrites in the upper manual. If shifting the buss bars make the problem go away then you know where to look / clean. If it is the upper manual then you could add foldback while you have it apart for cleaning.