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Post by husker on Feb 10, 2018 12:25:40 GMT -5
 Help! How do I reverse this crazy main board destruction? THe channel expansion selector switch wires have two of the three disconnected(crap soldering job it appears) and either I try to figure out how to reconnect them or just reverse ths mod. This radio has the MB8734 PLL. |
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Post by husker on Feb 10, 2018 17:58:21 GMT -5
Apparently, this mod takes the crystal from the main board and cuts the trace where that crystal would normally go. Any one ever heard of this mod?
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Sandbagger
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Post by Sandbagger on Feb 10, 2018 22:18:55 GMT -5
Apparently, this mod takes the crystal from the main board and cuts the trace where that crystal would normally go. Any one ever heard of this mod? Looks like they removed the 11.325 crystal and put it on a remote switch in order to switch between several crystals for extra channels (a very common way of doing this). But if they didn't first swap out the MB8734 PLL with an MB8719 chip, they're making it tougher than it has to be. I would just remove the whole thing and solder the crystal back in its original place and restore the proper components. |
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Post by husker on Feb 10, 2018 22:38:09 GMT -5
Apparently, this mod takes the crystal from the main board and cuts the trace where that crystal would normally go. Any one ever heard of this mod? Looks like they removed the 11.325 crystal and put it on a remote switch in order to switch between several crystals for extra channels (a very common way of doing this). But if they didn't first swap out the MB8734 PLL with an MB8719 chip, they're making it tougher than it has to be. I would just remove the whole thing and solder the crystal back in its original place and restore the proper components. I agree, but I worry there many, be more things removed? And yes this does have the 8734 chip |
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Sandbagger
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Post by Sandbagger on Feb 11, 2018 10:45:43 GMT -5
Looks like they removed the 11.325 crystal and put it on a remote switch in order to switch between several crystals for extra channels (a very common way of doing this). But if they didn't first swap out the MB8734 PLL with an MB8719 chip, they're making it tougher than it has to be. I would just remove the whole thing and solder the crystal back in its original place and restore the proper components. I agree, but I worry there many, be more things removed? And yes this does have the 8734 chip The only way to know that is to compare it to the schematic, or to your freshly tuned up 2000 and replace the parts that had been removed, and restore the connection that had been cut. |
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