Author Topic: Sunn SX6350 - Resistor ID/ Schematic Needed  (Read 1370 times)

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Offline dreamconduit

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Sunn SX6350 - Resistor ID/ Schematic Needed
« on: May 20, 2015, 10:10:19 pm »
hi, i was just gifted a Sx6350. it just needs new fuses and 1 blown resistor replaced. but the resistor is fried beyond being able to ID the stripes. it is  # R17 on the pcb module #1(connected to rear panel and heatsink. i think this is the power section, could be way off though). can anybody help me ID the proper resistor value to get as replacement??

any help would be most appreciated. thanks a TON in advance!
cheers!

Offline loudthud

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Re: Sunn SX6350 - Resistor ID/ Schematic Needed
« Reply #1 on: May 21, 2015, 12:59:52 pm »
R17 is 5.6 Ohm 1W according to my schematic. This would seem to indicate a blown driver transistor (Q7 and/or Q8) and the resistor will probably fo up in smoke if the cause is not found. If you are not familiar with repair of high power audio power amps, you should take the amp to someone who is.

Offline dreamconduit

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Re: Sunn SX6350 - Resistor ID/ Schematic Needed
« Reply #2 on: May 22, 2015, 04:10:22 am »
yes. thank you! your reply is exactly in line w what i was told. i was explicitly told the bad driver transistors were both already replaced, and they do appear new. thnx a ton!