8903A Error 14, power supply circuit diagram - Page 2 - diyAudio
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Old 18th July 2014, 05:30 PM   #11
1audio is offline 1audio  United States
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If you are troubleshooting the mass replacement of parts can hide a real problem. Its important to chase down the root cause before doing preventative maintenance. A low supply probably is not a cap. They usually fail as shorts or opens. Its really annoying to replace a bunch of parts and have the original cause of the failure fry the new parts. The power supply regulator will dump power into a partially failed cap heating it up until it fails completely. A supply running low should be checked in a more thorough way. Start by disconnecting the loads (pulling cards) and check the supply voltage. Also look for signs of overheating. Burnt resistors or PCB would be a good indicator of a failed part.
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Old 18th July 2014, 05:33 PM   #12
1audio is offline 1audio  United States
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Replacing the computer grade caps in the supply with new caps will be a good long term thing. The screw terminal caps are passing. However getting a suitable replacement that will work in the space may prove more difficult than you expect. Long leads will compromise the cap performance.
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Old 22nd July 2014, 08:12 AM   #13
usul27 is offline usul27  Switzerland
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The 13V were the problem. Oscilloscope showed heavy ripple on this voltage rail. The electrolytic cap failed. Replacing it solved the problem. Now the analyzer is workign again. I will also replace the other 2 caps in the power supply in the next time.
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