knight kit t 60 help

[jer19541]

Have a VERY close look at that switch. Odds are it's built from wafers of brown bakelite plastic. If you saw where on the switch the arc came from, get a bright light onto that section and see if a black bridge has burned/formed between adjacent contacts. This happens a lot in other radios, but I'm just guessing about seeing that fault in this one.

73

Ok thanks for the help. N4tbu

 

[jer19541]

Have a VERY close look at that switch. Odds are it's built from wafers of brown bakelite plastic. If you saw where on the switch the arc came from, get a bright light onto that section and see if a black bridge has burned/formed between adjacent contacts. This happens a lot in other radios, but I'm just guessing about seeing that fault in this one.

73

I checked switch I noticed the brown wafer looked saturated with d oxit which I sprayed on over a year ago. Both wafers. I'm guessing this is a problem

 

[jer19541]

I checked switch I noticed the brown wafer looked saturated with d oxit which I sprayed on over a year ago. Both wafers. I'm guessing this is a problem

I checked switch I noticed the brown wafer looked saturated with d oxit which I sprayed on over a year ago. Both wafers. I'm guessing this is a problem

Also. The clasp that makes contact with the wafer foil. Is bent and in poor condition. Seen arcing from a rivet that holds the clasp on

 

[nomadradio]

Makes it sound more like your short circuit is passing through the switch.

Time to take a meter set for continuity with one lead clipped to ground, and poke lugs on the meter with the other probe ne by one. Rotate the selector while checking each lug. A spot that shows the short no matter where the selector is turned will be connected to your short circuit. The wires leading away from that lug will be your next target. Well, what's connected to the far end of those wires.

Touching the probe to a lug that only shows continuity at one or two positions of the knob gets you close to the short, but you want the lug that shows a short all the time, no matter where the knob is turned.

73

 

[jer19541]

Makes it sound more like your short circuit is passing through the switch.

Time to take a meter set for continuity with one lead clipped to ground, and poke lugs on the meter with the other probe ne by one. Rotate the selector while checking each lug. A spot that shows the short no matter where the selector is turned will be connected to your short circuit. The wires leading away from that lug will be your next target. Well, what's connected to the far end of those wires.

Touching the probe to a lug that only shows continuity at one or two positions of the knob gets you close to the short, but you want the lug that shows a short all the time, no matter where the knob is turned.

73

Thanks

 

[jer19541]

Makes it sound more like your short circuit is passing through the switch.

Time to take a meter set for continuity with one lead clipped to ground, and poke lugs on the meter with the other probe ne by one. Rotate the selector while checking each lug. A spot that shows the short no matter where the selector is turned will be connected to your short circuit. The wires leading away from that lug will be your next target. Well, what's connected to the far end of those wires.

Touching the probe to a lug that only shows continuity at one or two positions of the knob gets you close to the short, but you want the lug that shows a short all the time, no matter where the knob is turned.

73

Checked all lugs on function switch (10) no shorts to ground on any lugs