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STANDARD C520 C528 how to repair if squelch is not working

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Because of free running fluid out of broken caps some vias can get broken. Here I will show you how to solve problems with not-working sqelch on STANDARD C-520 and C-528.

  1. STANDARD C520 C528 how to repair if squelch is not working, Replacing capacitors and cleanup: crwdns2935265:01crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Cover the plastic-front against scratches and daamages.

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  2. STANDARD C520 C528 how to repair if squelch is not working: crwdns2935265:02crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Loose the screws on the back and on the bottom

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  3. STANDARD C520 C528 how to repair if squelch is not working: crwdns2935265:03crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Remove the screws, marked red. Locate the old capacitors, marked yellow. And locate the old battery, marked green.

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  5. STANDARD C520 C528 how to repair if squelch is not working: crwdns2935265:04crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Replace the old caps. At best exchange to tantalium. The three caps on the left uper side and the above the CPU must be replaced against 220µF 6V. Replace the battery It is a wired CR2016.

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  6. STANDARD C520 C528 how to repair if squelch is not working: crwdns2935265:05crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Next lets have a look on the RF-unit. Loose the screws and desolder the antenna connector. Unmount the board. Then locate and replace the caps.

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  7. STANDARD C520 C528 how to repair if squelch is not working: crwdns2935265:06crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Remember to replace the cap bottom left as well. The marked trimmer is for freqeuncy-alignment

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  8. STANDARD C520 C528 how to repair if squelch is not working, squelch is not working: crwdns2935265:07crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • If squelch on your STANDARD C-520 or C-528 is not working then check and repair the vias as shown in the picture.

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For more details how to dis- and reassemble pleace check the quide of recapping STANDARD C-520 and C-528 here on ifixit.com.

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ELKOBA

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