Question about Sunfire 300 Two Amplifier

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Suddenly my Sunfire 300 x 2 started to HUM, need a Scematic Manual or advice on which parts to be tested

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Sounds like a shorted capacitor in the sub out circuit.

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Back up, open the manual and set it up with test tones to verify the hardware before trying anything else. Then onboard FM. Then external sources (according to their manuals).

Hum/buzz solutions are common on the internet. Do some web searching for "audio system hum" to find somethign that matches your symptom.

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I have a Sunfire 300 Two, when powered on and connected t the pre amp the output became very low, also the sound is not normal the sound is clipped and towards to high treble. I removed both the RCA cables...


The internal preamp driver is defective. You will need to test the preamp IC and its reaction circuits and then the voltage it receives from the power supply. If the problem is in the power supply you will need to check the rectifiers and the stabilizer circuits.

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My dodge durango stop suddenly , the engine was off,tried to cranck it but not starting ,after ten to twenty minutes started .i drove for ten km.then off again. kindly advice


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Sunfire Amplifier hum


If it works fine with other inputs then it simply cannot be your sunfire. Next time it happens try reversing the power plug on one of the pieces of equipment hooked up to it and see what happens.

Mar 11, 2017 | Audio Players & Recorders

2 Answers

GE JVM150001 Microwave


There should be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

Can you scan and e-mail or photocopy & fax the "schematic diagram" portion of the mini-manual to me?

Feel free to contact me directly for more information & help.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com
fax 866-481-2802

Sep 28, 2008 | Microwave Ovens

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