Question about Radio Communications
Radio was plugged in backwards , with 3 amp fuse inline . I replaced d23 , and fuse ,brought it back to life .I tried several ( known good ) mics .Still no rx / tx .
Altho the rx / tx light does switch back and forth showing 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
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
May 04, 2016 | Radio Communications
Oct 23, 2011 | Cobra 29 LTD CB Radio
Feb 11, 2011 | Cobra 25 LTD 40-Channels Base CB Radio
Oct 07, 2010 | Cobra 29 LTD CB Radio
Aug 22, 2010 | Cobra 29 LTD CB Radio
May 07, 2010 | Cobra 29 LTD CB Radio
Nov 17, 2009 | Cobra 29 LTD CB Radio
Nov 14, 2009 | Cobra 29 LTD CB Radio
May 02, 2009 | Cobra 29 WX NW ST 40-Channels Base CB...
Feb 12, 2008 | Cobra 25 LTD 40-Channels Base CB Radio
843 people viewed this question
Usually answered in minutes!