03-09-2015, 07:20 PM
Does the resistance reading vary as you turn the volume control up and down? It should show the highest resistance when it is at the lowest volume setting.
The next thing is to check the oscillator feedback winding. Find the 6000 ohm dogbone resistor ( blue body, black end, red dot ) This resistor is in series with the feedback winding of the osc coil. Measure either end of this resistor to chassis ground. One end should read almost zero ohms to chassis. The other end should measure around 6000 ohms. If you get an infinite ohms reading between both ends and chassis ground, then the coil winding is open.
The next thing is to check the oscillator feedback winding. Find the 6000 ohm dogbone resistor ( blue body, black end, red dot ) This resistor is in series with the feedback winding of the osc coil. Measure either end of this resistor to chassis ground. One end should read almost zero ohms to chassis. The other end should measure around 6000 ohms. If you get an infinite ohms reading between both ends and chassis ground, then the coil winding is open.
