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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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help: repair to VHF marine radio
I am attempting to repair a Midland Model 78-100 VHF Marine Radio for
a friend. I have basic radio electronics knowledge, some troubleshooting skills, a 275MHz scope, VHF sig generator, freq meter, RF power meter, etc, but am unable to locate the problem. Symptoms a completely dead on receive and transmit on all channels, but unit powers up good, all power supply circuits and voltages are good, display and frequency display circuitry are good, no detectable cold solder joints nor sal****er corrosion anywhere, power to all chips is good. I first suspected the PLL circuitry (due to its being common to RX and TX), but signals coming out of the PLL, prescaler and VCO chips appear ok. Any suggestions as to where I might start looking would be greatly appreciated. Larry Gagnon |
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