Support to repair Rockford Fosgate 1501bd amplifier

josesony68 · 26th July 2011, 04:24 PM

Hi, I have this time I got broken after changing several output transistors (IRF3415 and IRF6215) to connect, turn on the LED protection and noted that heating the Q115 (IRF337) I check voltages and appears to be correct in several points of the plate (HV + and HV-134V) any idea?

Perry Babin · 26th July 2011, 11:35 PM

Do you mean Q15?

That's supposed to be an LM317, not an LM337.

josesony68 · 27th July 2011, 07:09 AM

Yes, sorry Perry, I was confused, which is heated Q16 (LM337) also I have the U14 and U21 measures
U14 (UC3526N)
pin 1 = 5
pin 2 = 3.68
pin 3 = 4.23
pin 4 = 4.76
pin 5 = 5
pin 6 = 0.04
pin 7 = 0.01
pin 8 = 4.43
pin 9 = 3.68
pin 10 = 2.04
pin 11 = 0.02
pin 12 = 4.68
pin 13 = 6.33
pin 14 = 15
pin 15 = 0
pin 16 = 6.34
pin 17 = 15.05
pin 18 = 5.03

U21 (TL072C)
pin 1= -8,33
pin 2= 7,83
pin 3= -8,86
pin 4= -9,65
pin 5= 5,03
pin 6= -6,58
pin 7= 8,41
pin 8= 9,75

26th July 2011, 04:24 PM	#1
josesony68 diyAudio Member Join Date: Feb 2011 Location: Caceres	Support to repair Rockford Fosgate 1501bd amplifier Hi, I have this time I got broken after changing several output transistors (IRF3415 and IRF6215) to connect, turn on the LED protection and noted that heating the Q115 (IRF337) I check voltages and appears to be correct in several points of the plate (HV + and HV-134V) any idea?

26th July 2011, 11:35 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do you mean Q15? That's supposed to be an LM317, not an LM337. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

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27th July 2011, 07:09 AM	#3
josesony68 diyAudio Member Join Date: Feb 2011 Location: Caceres	Yes, sorry Perry, I was confused, which is heated Q16 (LM337) also I have the U14 and U21 measures U14 (UC3526N) pin 1 = 5 pin 2 = 3.68 pin 3 = 4.23 pin 4 = 4.76 pin 5 = 5 pin 6 = 0.04 pin 7 = 0.01 pin 8 = 4.43 pin 9 = 3.68 pin 10 = 2.04 pin 11 = 0.02 pin 12 = 4.68 pin 13 = 6.33 pin 14 = 15 pin 15 = 0 pin 16 = 6.34 pin 17 = 15.05 pin 18 = 5.03 U21 (TL072C) pin 1= -8,33 pin 2= 7,83 pin 3= -8,86 pin 4= -9,65 pin 5= 5,03 pin 6= -6,58 pin 7= 8,41 pin 8= 9,75