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585pll [2007/05/21 00:44] 127.0.0.1 external edit |
585pll [2007/09/04 16:37] n5na |
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| 73, Bob WB2VUF | 73, Bob WB2VUF | ||
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| + | **September 4, 2007** | ||
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| + | Having owned several Paragon {original version} radios and experienced the PLL UNLOCK problems and having repaired several others including my own radio, I have always found that the soldering on the PLL board is thought to be the source of the problems. In actuality, the PC board lands are bare copper and were not tinned immediately after etching. The result is oxidation forming on the lands and pads. Subsequently, the manufacturing process did not include adequate cleaning and thus the solder flow was inadequate, often leaving etching agents and oxidation below the solder. This surfaced as a bad solder connection after a few years. | ||
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| + | While many say "touch up" the solder on the PLL boards, this usually is only a temporary fix. The contaminated etching agent and oxidation still remains. The solution is to remove the solder with a vacuum system or solder wick system. Clean and polish the pads with a Dremel buffing wheel and immediately solder tin the pads. Once done, this results in a satisfactory and long term solution to the problem. | ||
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| + | 73\\ | ||
| + | Bob, K4TAX | ||
