Question about Radio Communications
What is radio brand and model? we need more info like is it hooked up to power, is the antennae hooked up, is the correct microphone hooked up, is the antennae been SWR to the radio. worst case scenario the crystal and the pll chip are shot. or some bad solder connections. or speaker.
Posted on Nov 28, 2013
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Posted on Jan 02, 2017
SOURCE: cobra 29ltd classic : no rx / tx
D23 is the reverse protection diode and it shorting is the primary reason your fuse blew. As you posted, power was applied in reverse, hence other components would also fail. Pls check:
1. D22 - 9.1V Zener Diode
2. TR23 (2SC1096) 9 Volts regulator
3. D19 - 5.1 Zener Diode
4. IC4 (TA7222) - Audio Amp
5. TR14 (2SC2029B/10) - Finals
6. TR15 (2SC2028B/20) - Driver
7. Most capacitors over 220uF (like C123, C114 & C112)
Hope that this be of help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Posted on Feb 04, 2008
I think your problem with the Cobra cb is in the microphone, you should have a plug on the Mic cord end ,try disconnecting this from the CB unit and see if it clears it self. If this does the trick your problem is in the Mic it self, or the cord has a fault in it. However if you still have a problem it may be that the transmitt/ receive relay located in the Cb is stuck on transmitt, sometimes this can be cleared by tapping the case with the handle of a screw driver, place towel on the case first to stop any damage to the case( this doe's not always work) you may in this case need to have it serviced
all the best hope I have been of help,
Posted on Apr 09, 2009
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