Question about Cobra 18 WX ST 40-Channels Base CB Radio

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CB keeps blowing fuses

My cobra 18wx stl ll blows fuses when plugged in

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There are a few common reasons the fuse keeps blowing:

1. The transmitter final transistor is bad, it usually is directly connected to the 12v source and not switched by the power switch.
2. The power wires were accidentally reversed I.E. positive to ground, neg to 12v. There is a protection diode on the circuit board that did its job and is now shorted. it will keep blowing fuses until its replaced.


Posted on Jan 01, 2009

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Posted on Jan 02, 2017

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There are only a couple of components that could cause the fuse to blow. They are:
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2. filter capacitor (C123)
3. Outputs (TR14 & 15)
4. Audio Amp (IC4)
5. Zener Diodes (D22 & 19)
6. the fuse itself (it should be 2 Amps

Hope this be of help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FIXYA.

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