Directed 750 D

mike49504 · 26th June 2010, 07:48 PM

I got this amp in for repair and resoldered the pads on the 2 boards in the amp for the gain and crossover.

Amp powers up and plays but the gain control and the switches do not work in this amp.

It only plays full range music and cant get the gain control or any switch to work.

Wondering what might cause this?

Perry Babin · 26th June 2010, 08:48 PM

Master/slave switch?

mike49504 · 26th June 2010, 08:50 PM

Tryed the also and amp will only play full range

Perry Babin · 26th June 2010, 08:53 PM

Can you post a photo of the preamp section of the amp?

mike49504 · 29th June 2010, 12:07 AM

Perry,

Heres the pics of the preamp and output section I still cant figure out why the switches/pots do not work

Perry Babin · 29th June 2010, 12:56 AM

If you drive a sine wave into the amp and measure the AC voltage on the pots in the amp, do you have varying voltage on any leg of any pot?

mike49504 · 29th June 2010, 01:05 AM

Both pots have varying voltage on them

Perry Babin · 29th June 2010, 01:07 AM

Do any terminals of any switch have varying voltage on them?

mike49504 · 29th June 2010, 01:14 AM

All switches have voltage on them but not varying the volte stays at 1 spot

mike49504 · 29th June 2010, 03:23 PM

Any thoughts on this amp?

Pots have varrying voltage on them Switches have voltage but the voltage is not varying

26th June 2010, 07:48 PM	#1
mike49504 diyAudio Member Join Date: Sep 2006	Directed 750 D I got this amp in for repair and resoldered the pads on the 2 boards in the amp for the gain and crossover. Amp powers up and plays but the gain control and the switches do not work in this amp. It only plays full range music and cant get the gain control or any switch to work. Wondering what might cause this?

26th June 2010, 08:48 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Master/slave switch? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

26th June 2010, 08:53 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Can you post a photo of the preamp section 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

29th June 2010, 12:56 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If you drive a sine wave into the amp and measure the AC voltage on the pots in the amp, do you have varying voltage on any leg of any pot? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

29th June 2010, 01:07 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do any terminals of any switch have varying voltage on them? __________________ 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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26th June 2010, 08:50 PM	#3
mike49504 diyAudio Member Join Date: Sep 2006	Tryed the also and amp will only play full range

29th June 2010, 01:05 AM	#7
mike49504 diyAudio Member Join Date: Sep 2006	Both pots have varying voltage on them

29th June 2010, 01:14 AM	#9
mike49504 diyAudio Member Join Date: Sep 2006	All switches have voltage on them but not varying the volte stays at 1 spot

29th June 2010, 03:23 PM	#10
mike49504 diyAudio Member Join Date: Sep 2006	Any thoughts on this amp? Pots have varrying voltage on them Switches have voltage but the voltage is not varying

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