Power Acoustic PA2-820

mike49504 · 9th August 2011, 12:50 AM

The left channel had 38 volts of dc on the outputs so i removed the outputs and replaced the drivers for the outputs..

Outputs are still out of the amp right now..

Problem im having is the drivers are getting red hot within 5 secs after power up..

Any ideas?

Perry Babin · 9th August 2011, 12:40 PM

Solder bridges, drivers orientated the wrong way, drivers in the wrong location...

mike49504 · 9th August 2011, 01:52 PM

I checked there are no soler bridges,,,

And i took 1 driver out at a time and replaced it so im 100% sure that they are in the correct locations and facing the right way...

Perry Babin · 9th August 2011, 02:13 PM

There's nothing connected to the drivers, as far as I know, other than the supply voltage and a 220 ohm resistor connecting the two drivers. This would mean that all of the current would have to be flowing through the 220 ohm resistor. If the drivers were overheating, I'd expect the 220 ohm resistor to be overheating as well.

Is the 220 ohm resistor overheating?

Did you use exact replacements?

Were the drivers new?

mike49504 · 9th August 2011, 02:27 PM

the 220 ohm resistor overheats as well..

I used the exact replacements..

Drivers were new

Perry Babin · 9th August 2011, 03:25 PM

Are the diodes connected to the bases of the drivers shorted?

mike49504 · 9th August 2011, 03:29 PM

No i pulled them and checked both they test fine

Perry Babin · 9th August 2011, 03:45 PM

Does the bias transistor have an open junction?

mike49504 · 9th August 2011, 03:49 PM

no

Perry Babin · 9th August 2011, 06:13 PM

You'll have to work your way back through the circuit, carefully checking the components until you find the fault.

9th August 2011, 12:50 AM	#1
mike49504 diyAudio Member Join Date: Sep 2006	Power Acoustic PA2-820 The left channel had 38 volts of dc on the outputs so i removed the outputs and replaced the drivers for the outputs.. Outputs are still out of the amp right now.. Problem im having is the drivers are getting red hot within 5 secs after power up.. Any ideas?

9th August 2011, 12:40 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Solder bridges, drivers orientated the wrong way, drivers in the wrong location... __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

9th August 2011, 02:13 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	There's nothing connected to the drivers, as far as I know, other than the supply voltage and a 220 ohm resistor connecting the two drivers. This would mean that all of the current would have to be flowing through the 220 ohm resistor. If the drivers were overheating, I'd expect the 220 ohm resistor to be overheating as well. Is the 220 ohm resistor overheating? Did you use exact replacements? Were the drivers new? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

9th August 2011, 03:25 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Are the diodes connected to the bases of the drivers shorted? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

9th August 2011, 03:45 PM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Does the bias transistor have an open junction? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

9th August 2011, 01:52 PM	#3
mike49504 diyAudio Member Join Date: Sep 2006	I checked there are no soler bridges,,, And i took 1 driver out at a time and replaced it so im 100% sure that they are in the correct locations and facing the right way...

9th August 2011, 02:27 PM	#5
mike49504 diyAudio Member Join Date: Sep 2006	the 220 ohm resistor overheats as well.. I used the exact replacements.. Drivers were new

9th August 2011, 03:29 PM	#7
mike49504 diyAudio Member Join Date: Sep 2006	No i pulled them and checked both they test fine

9th August 2011, 03:49 PM	#9
mike49504 diyAudio Member Join Date: Sep 2006	no

9th August 2011, 06:13 PM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	You'll have to work your way back through the circuit, carefully checking the components until you find the fault. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read