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Uniden 78xl no TX or Rx
- Thread starter BAGEBOY
- Start date
Mic wiring comes to mind.
IF it can't send power to the rear final and driver, it can damage the audio transformer ( as in arcs a short) but it will kill and pop the transformer like a fuse but you'll still have a working radio with no power to TX or speaker, but show RX and seem to work just no TX - so when you get back in there - use a standard bulb (12V automotive tester) to place a load across on the output Diode, to foil ground battery negative from the mod transformer and see if it will light - if it lights you have a heartbeat.
You just have to figure out the CB/PA switch and see if it's been rewired for something else.
One side of the CP PA switch (pole) wires Speaker to rear output terminals - the other goes to Pre-Driver and makes(CB) or breaks(PA) the POWER connection to the Pre-driver.
IF it can't send power to the rear final and driver, it can damage the audio transformer ( as in arcs a short) but it will kill and pop the transformer like a fuse but you'll still have a working radio with no power to TX or speaker, but show RX and seem to work just no TX - so when you get back in there - use a standard bulb (12V automotive tester) to place a load across on the output Diode, to foil ground battery negative from the mod transformer and see if it will light - if it lights you have a heartbeat.
You just have to figure out the CB/PA switch and see if it's been rewired for something else.
One side of the CP PA switch (pole) wires Speaker to rear output terminals - the other goes to Pre-Driver and makes(CB) or breaks(PA) the POWER connection to the Pre-driver.
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