I'm having trouble with the wiring for a 3 prong standby switch and a 4 prong mains switch.
Its for a JCM 800 style build.
As for background, I am basically erector setting a jcm 800. I was given the amp in pieces, and I'm learning as I build. Standby and power switches are still a mystery to me.
Lighted rocker switch wiring
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Lighted rocker switch wiring
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stretch2011
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Re: Lighted rocker switch wiring
If you want to learn for yourself. Use the continuity setting on your dmm if you have one and see what is connected with what when you flip the switch.
Re: Lighted rocker switch wiring
3 pin switch switches between center and outside. 4 pin switch switches between the bottom lugs and the top. I'm assuming from this that the power just runs through the switch and I don't need to use the heater taps to light the switch.stretch2011 wrote:If you want to learn for yourself. Use the continuity setting on your dmm if you have one and see what is connected with what when you flip the switch.
Re: Lighted rocker switch wiring
Never thought if it before, but will the neon lamps work on DC?
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martin manning
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Re: Lighted rocker switch wiring
The power switch probably has the lamp connected from one SPST switch to the other. With the switch in the "off" position, connect mains voltage to one pair and then the other (pairs are side-to-side). The lamp may come on, in which case those are the terminals that go to the PT. If it doesn't turn on, then either pair can be connected to the PT.
For the 3-pin standby switch, I'm not sure how that would work. Does it switch from center to just one of the outside lugs or from one to the other? See if you can find a manufacturer's name and a part number on it, then Google for some documentation.
Neon lamps will glow with DC, just need enough voltage to ionize, and a resistor to limit current.
For the 3-pin standby switch, I'm not sure how that would work. Does it switch from center to just one of the outside lugs or from one to the other? See if you can find a manufacturer's name and a part number on it, then Google for some documentation.
Neon lamps will glow with DC, just need enough voltage to ionize, and a resistor to limit current.
Last edited by martin manning on Sun Oct 25, 2015 4:18 pm, edited 1 time in total.
Re: Lighted rocker switch wiring
***CAUTION*** Not all switches are the same! Verify what kind of switch you have.
For the 3 lug switch... Two contacts will be the switch. The third contact will be the neon lamp. Use your ohm meter to locate the two contacts that have the switch across them. Flip one way should show open. Flip the other way should be zero ohms. The third lug will have no continuity to either of the other two lugs.
Your switch lugs may even be identified for you. Look closely at both sides of the switch.
See the attached pic. I've been using this switch as a power switch on my last three projects. Lugs 1 and 2 are the switch contacts. See the switch symbol between lugs 1 and 2? Lug three is the indicator lug. See the neon lamp and resistor symbols between lugs 2 and 3? Look at pages 2 and 3 of this pdf to see how I wired this switch...
http://home.comcast.net/~seluckey/amps/ ... one_M2.pdf
To use this or a similar switch as a standby switch, simply connect the B+ from the rectifier to lug 1. Connect lug 2 to the filter caps. (This is all standard, just as if the switch only had two lugs.) Lug 3 will connect to chassis ground, but since the resistor inside the switch is probably 100K or 220K (we don't really know) which is fine for 120 or 240 volt operation, it would be safer to connect lug 3 through a 220K to ground. If the light is not bright enough with the external 220K, you can always just use a lower value. You may even be able to just ground lug 3.
For the 3 lug switch... Two contacts will be the switch. The third contact will be the neon lamp. Use your ohm meter to locate the two contacts that have the switch across them. Flip one way should show open. Flip the other way should be zero ohms. The third lug will have no continuity to either of the other two lugs.
Your switch lugs may even be identified for you. Look closely at both sides of the switch.
See the attached pic. I've been using this switch as a power switch on my last three projects. Lugs 1 and 2 are the switch contacts. See the switch symbol between lugs 1 and 2? Lug three is the indicator lug. See the neon lamp and resistor symbols between lugs 2 and 3? Look at pages 2 and 3 of this pdf to see how I wired this switch...
http://home.comcast.net/~seluckey/amps/ ... one_M2.pdf
To use this or a similar switch as a standby switch, simply connect the B+ from the rectifier to lug 1. Connect lug 2 to the filter caps. (This is all standard, just as if the switch only had two lugs.) Lug 3 will connect to chassis ground, but since the resistor inside the switch is probably 100K or 220K (we don't really know) which is fine for 120 or 240 volt operation, it would be safer to connect lug 3 through a 220K to ground. If the light is not bright enough with the external 220K, you can always just use a lower value. You may even be able to just ground lug 3.
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martin manning
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Re: Lighted rocker switch wiring
If it were me, I'd want the standby switch to be illuminated when it's in standby mode. To do that I think you would just connect lug 3 to lug 1 so the neon bulb-resistor combination is across the switch. The bulb is then shorted out when the switch is in run mode.
Re: Lighted rocker switch wiring
I like that idea too!