Memphis Power Reference PR 1.500

Dr Zeus · 01:04 PM

I think this is a Type I Class-D amp like on the DVD.

Ive got this amp which had all IRF9640 outputs blown, plus all blown power supply IRFZ44. i replaced the failed outputs, plus put one IRFZ44 into each bank. The amp powered and played, but the replacement IRFZ44 got hot within about 20 seconds. I installed all 8xIRFZ44 and the amp started drawing excessive current. I noticed at this point the drive signal no good to the PS fets. With the drivers removed, the TL494 is showing a good signal to the drivers.

Q5, Q10, Q6, and Q9 are all suspect. A733 and C945 were used in these locations. Can I use BD139/BD140? Also, I cant remember the installation orientation: Q6/Q9 center pad is referencing 0ohms to ground, while Q5/Q10 center pad is measuring 0ohms to B+.

Perry Babin · 27th December 2011, 01:16 PM

0 ohms to ground on the collector is the PNP transistor.

27th December 2011, 01:02 PM	#1
Dr Zeus diyAudio Member Join Date: Oct 2010	Memphis Power Reference PR 1.500 I think this is a Type I Class-D amp like on the DVD. Ive got this amp which had all IRF9640 outputs blown, plus all blown power supply IRFZ44. i replaced the failed outputs, plus put one IRFZ44 into each bank. The amp powered and played, but the replacement IRFZ44 got hot within about 20 seconds. I installed all 8xIRFZ44 and the amp started drawing excessive current. I noticed at this point the drive signal no good to the PS fets. With the drivers removed, the TL494 is showing a good signal to the drivers. Q5, Q10, Q6, and Q9 are all suspect. A733 and C945 were used in these locations. Can I use BD139/BD140? Also, I cant remember the installation orientation: Q6/Q9 center pad is referencing 0ohms to ground, while Q5/Q10 center pad is measuring 0ohms to B+. Last edited by Dr Zeus; 27th December 2011 at 01:04 PM.

27th December 2011, 01:16 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	0 ohms to ground on the collector is the PNP transistor. __________________ 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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