Question about Cobra FRS 307 (14 Channels) 2-Way Radio
The unit will not power up. i took it apart and read the voltage on the back side of the battery compartment and got good voltage. i also worked the switch and it clicks but i dont have a schematic to help me trace the power. does anyone have the schematics?
GO TO THE FCC WEBSITE:
ENTER THE FCC ID # YOU MUST ENTER IT CORRECTLY.
FOR INSTANCE...MY FCC ID # IS G9H3-5810 ENTERD CORRECTLY WOULD BE ON THE FIRST LINE
G9H AND THE NEXT LINE 3-5810.
TRY THIS FIRST UNTIL YOU GET USE TO IT AN IT WILL BRING UP ANOTHER MENU. UNDER DISPLAY EXHIBIT CLICK ON DETAIL
THEIR YOU WILL SEE BLOC DIAGRAMS,SCHEMATICS ETC. HOWEVER NOT EVERY RADIO WILL DISPLAY THIS,IF THE COMPANY PAYS EXTRA $ TO THE FCC CERTIAN THINGS WILL NOT BE DISPLAYED LIKE SCHEMATICS.
THERE IS A WAY AROUND THIS ALSO, THE US PATENT OFFICE. TYPE IN THE PANTENT NUMBER AND EVERYTHING WILL BE DISPLAYED, IF YOU CAN FIND THE PATENT ID #.
HOPED THIS HELPED
Posted on Dec 30, 2007
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Posted on Jan 02, 2017
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This resistor was blown out.
I pulled it out before I took the picture I went ahead and replaced all of the 4.7 ohm 1/4 watt resistors:
Blown out 4.7ohm 1/4 watt resistor:
Just before surgery on the amp chips:
Re-jumpered the traces:
Re-jumpered the traces:
New amp chips are in! Boy that "Heat Sink Transfer Paste" is really messy!!!:
A peek at the underside:
New L7815CV Positive Voltage Regulator (Shown here):
New L7915CV Negative Voltage Regulator is on the back side:
New amp chips are all nestled down in their new home!:
Boy that's a big heat-sink:
Time to try it
out. And it works. Boy, going a week with out 5.1 audio on your
computer is terrible! Nobody should have
to live that way or be subjected to that kind of torture. I guess this would be considered a "first
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