memphis 1000d

timwebb · 27th August 2011, 07:46 PM

ok i got this amp i thought i ran into every problem i could. this pic is from the out put gate resistors. every time i put the output driver card in the red and green light comes on.

Perry Babin · 27th August 2011, 07:54 PM

Which driver board are you referring to?

timwebb · 27th August 2011, 07:57 PM

this is at the output gate.
volts/div .2
time/div 2

timwebb · 27th August 2011, 08:03 PM

this came from a shop so im sure some stuff was replaced on it.

Perry Babin · 27th August 2011, 08:10 PM

Are you sure that the scope was set to 0.2v/div?

If you set it to 0.5v/div and touch it to the B+ terminal of the power supply, does the trace go off of the top of the display?

Was there an input signal or not?

You can look at the solder joints and compare it to the other driver board to determine if anything has been replaced.

timwebb · 27th August 2011, 08:19 PM

yes its set to 0.2 volts/div

If you set it to 0.5v/div and touch it to the B+ terminal of the power supply, does the trace go off of the top of the display? no doesnt move.

Was there an input signal or not? no

the resistors in the picture look like one end was taken up then resolderd to the to of the board.

Perry Babin · 27th August 2011, 10:32 PM

Is the scope set to DC coupling?

timwebb · 27th August 2011, 11:41 PM

no.

Perry Babin · 27th August 2011, 11:46 PM

Unless you have a VERY good reason, ALWAYS leave it set to DC.

Try what I suggested again. What does the trace do.

timwebb · 28th August 2011, 12:44 AM

yes the trace goes to the top now.

27th August 2011, 07:46 PM	#1
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	memphis 1000d ok i got this amp i thought i ran into every problem i could. this pic is from the out put gate resistors. every time i put the output driver card in the red and green light comes on.

27th August 2011, 07:54 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Which driver board are you referring to? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

27th August 2011, 08:10 PM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Are you sure that the scope was set to 0.2v/div? If you set it to 0.5v/div and touch it to the B+ terminal of the power supply, does the trace go off of the top of the display? Was there an input signal or not? You can look at the solder joints and compare it to the other driver board to determine if anything has been replaced. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

27th August 2011, 10:32 PM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Is the scope set to DC coupling? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

27th August 2011, 11:46 PM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Unless you have a VERY good reason, ALWAYS leave it set to DC. Try what I suggested again. What does the trace do. __________________ 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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27th August 2011, 08:19 PM	#6
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	yes its set to 0.2 volts/div If you set it to 0.5v/div and touch it to the B+ terminal of the power supply, does the trace go off of the top of the display? no doesnt move. Was there an input signal or not? no the resistors in the picture look like one end was taken up then resolderd to the to of the board.

27th August 2011, 11:41 PM	#8
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	no.

28th August 2011, 12:44 AM	#10
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	yes the trace goes to the top now.

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