help with power supply

timwebb · 18th June 2010, 08:21 PM

ok i im workin on a memphis 1000d that had a blown power supply i changed the gate resistors the fets and the pnp drivers on the driver card bbut it still not coming on the protection comes on now but im only getting 12v on the center leg of the fets in the power supply

Perry Babin · 18th June 2010, 11:32 PM

If this is the newer 1000D like the one you posted the photo of, please post a photo of the inside of the amp.

timwebb · 18th June 2010, 11:39 PM

im working on the driver card and it has cooked the wire traces off the board i didnt see it until i took the glue off the card it burnt the two pnp transistors. should i repace all of them?

Perry Babin · 18th June 2010, 11:44 PM

Generally, the two PNP driver transistors are the only transistors that fail on that board.

timwebb · 04:51 AM

ok i got the amp to power up but its missing parts. if any one has a better pic please post

its a memphis 1100d

Perry Babin · 19th June 2010, 05:21 AM

It appears that a film capacitor is missing. Are there stubs of the legs left in the through-holes?

timwebb · 19th June 2010, 05:26 AM

yeah the person who had it was trying to fix it they took most of the parts out.and all the output transistors are gone

Perry Babin · 19th June 2010, 09:26 AM

Does he have the parts he removed?

timwebb · 19th June 2010, 01:39 PM

yeah

Perry Babin · 19th June 2010, 02:06 PM

That will prevent having to guess about the value of the components.

18th June 2010, 08:21 PM	#1
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	help with power supply ok i im workin on a memphis 1000d that had a blown power supply i changed the gate resistors the fets and the pnp drivers on the driver card bbut it still not coming on the protection comes on now but im only getting 12v on the center leg of the fets in the power supply

18th June 2010, 11:32 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If this is the newer 1000D like the one you posted the photo of, please post a photo of the inside of the amp. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

18th June 2010, 11:44 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Generally, the two PNP driver transistors are the only transistors that fail on that board. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

19th June 2010, 05:21 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It appears that a film capacitor is missing. Are there stubs of the legs left in the through-holes? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

19th June 2010, 09:26 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Does he have the parts he removed? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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18th June 2010, 11:39 PM	#3
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	im working on the driver card and it has cooked the wire traces off the board i didnt see it until i took the glue off the card it burnt the two pnp transistors. should i repace all of them?

19th June 2010, 05:26 AM	#7
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	yeah the person who had it was trying to fix it they took most of the parts out.and all the output transistors are gone

19th June 2010, 01:39 PM	#9
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	yeah

19th June 2010, 02:06 PM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	That will prevent having to guess about the value of the components. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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