earthquake 200dhc power supply repair

ivkata · 18th April 2012, 07:24 AM

Im trying to repair this earthquake amp model 200dhc. few of the power supply transistors are defective so I'm replacing all of them .I do have the originals in stock but while checking for gate singal I'm getting 13v exactly as my power supply .Fets are being driven by a 8 pin Ic and the model number has been sanded off ,I'm guessing from the factory .I don't have that much experience but i believe the voltage is too high .If anyone have idea about this amp and the Ic model please let me know

thank you

ultra · 18th April 2012, 08:54 AM

I have repaired a similar amp (PH-D3).

If it uses 3525, check that both outputs (pins 11 and 14) are getting to the 8-pin chip.

If thats the case, its probably a TC4424.

18th April 2012, 07:24 AM	#1
ivkata diyAudio Member Join Date: Dec 2010	earthquake 200dhc power supply repair Im trying to repair this earthquake amp model 200dhc. few of the power supply transistors are defective so I'm replacing all of them .I do have the originals in stock but while checking for gate singal I'm getting 13v exactly as my power supply .Fets are being driven by a 8 pin Ic and the model number has been sanded off ,I'm guessing from the factory .I don't have that much experience but i believe the voltage is too high .If anyone have idea about this amp and the Ic model please let me know thank you

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18th April 2012, 08:54 AM	#2
ultra diyAudio Member Join Date: Jun 2005 Location: Athens	I have repaired a similar amp (PH-D3). If it uses 3525, check that both outputs (pins 11 and 14) are getting to the 8-pin chip. If thats the case, its probably a TC4424.