quick question

timwebb · 4th May 2011, 05:31 PM

ok im working on another memphis 1000d. the problem is i just replaced the op amps and one side of the outputs looks like this. when i put one in it flips like this.

timwebb · 4th May 2011, 06:11 PM

never mind! i got it.

timwebb · 5th May 2011, 04:01 AM

ok i gota rockford 1500. i found the shorted outputs.but anything i should check on this amp?

Perry Babin · 5th May 2011, 04:05 AM

Have you replaced the outputs yet?

There are 2 groups of FETs (leg 3 of all transistors directly connected in each group). Did FETs fail in both groups?

timwebb · 5th May 2011, 04:21 AM

no, and all the outputs failed.

Perry Babin · 5th May 2011, 04:29 AM

Since all of the outputs have failed, remove all of them and check the drive signal on the gate pads for both groups of FETs. To check the group nearest the RCA jacks, you may need to connect a jumper between the pad for the 3rd leg of one of the outputs (Q101) to the negative speaker terminal.

5th May 2011, 04:05 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Have you replaced the outputs yet? There are 2 groups of FETs (leg 3 of all transistors directly connected in each group). Did FETs fail in both groups? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

5th May 2011, 04:29 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Since all of the outputs have failed, remove all of them and check the drive signal on the gate pads for both groups of FETs. To check the group nearest the RCA jacks, you may need to connect a jumper between the pad for the 3rd leg of one of the outputs (Q101) to the negative speaker terminal. __________________ 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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4th May 2011, 06:11 PM	#2
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	never mind! i got it.

5th May 2011, 04:01 AM	#3
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	ok i gota rockford 1500. i found the shorted outputs.but anything i should check on this amp?

5th May 2011, 04:21 AM	#5
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	no, and all the outputs failed.

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