Question about GE Superadio III AM/FM
Customer brought in this radio to repair. He had it in a box with all parts. Put it back together and tried it. FM reception was far from complete. Lots of buzzing. Audio level not so good. On the main board are two sets of wound coils. one is ninety degree apart from another one. No ferrite core. Is there an easy way to tune these coils? I find that inserting a piece of paper in between a coil I can change the frequency of the tuning range, but still cannot get into the proper range 88-108Mhz. Have no idea what the inductance is. coil is about 1/2 inch long diameter is less than a quarter inch. wire looks like about 30 ga.
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Posted on Jan 02, 2017
SOURCE: Milwaukee Job site radio
1. Does the AC cord look ok? Not damaged?
2. Have you tried another AC outlet?
3. Does the AC cord unplug from the radio?
When you operate the radio from the AC power cord, the radio uses an internal power supply consisting of a step-down transformer, rectifier, and filter that converts the AC to DC to operate the radio.
When you run the radio off of batteries, it powers the radio directly. In some radios, when you plug the AC cord into the radio, it activates a switch that disconnects the battery voltage to the radio so that the batteries wont be damaged from the voltage created by the internal supply.
The radio can be powered by either the batteries or the internal supply. You don't want either supply affecting the other, so that is why a switch is sometimes used.
Since the radio works fine off of batteries, that would indicate that there is a problem with the internal power supply. This could be a blown fuse, bad transformer or bad rectifier diode.
Posted on Jan 24, 2008
Mine has a bad transformer, but I am having a hard time finding a replacement. This is due to the fluctuating voltage of the job site generator.
Posted on Oct 28, 2009
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