Lanzar Opti 2200

mike49504 · 2nd January 2010, 10:06 AM

This amp has very very low output.

The sg3525a reads
pin1=1.24 pin9=1.11
pin2= 1.23 pin10= .04
pin3= .03 pin11=0.41
pin4=0.1 pin12= .01
pin5= 2.05 pin13=8.73
pin6= 3.87 pin14= 0.42
pin7= 2.05 pin15= 13.70
pin8= 4.96 pin16= 5.22

Fet readings are leg1 (gate) 0.42 middle= 13.86 third=0

output readings (tip36c) = leg 1=0.41 middle= 33.99 3rd= -.02
tip 35c = 0.41 middle 34.02 3rd= 0.41

wondering what might cause the very low output

I Am An Idiot · 2nd January 2010, 12:18 PM

What is the voltage on pins 4 and 8 of the op-amps? Or pins 4 and 11 if they use a 4 channel amp.

Perry Babin · 2nd January 2010, 05:48 PM

What's the DC voltage on leg 3 of Q48?

Place the black probe on the RCA shield ground.

mike49504 · 2nd January 2010, 08:04 PM

Q48 = 0.64

Perry Babin · 2nd January 2010, 08:13 PM

Pull D20 and see if it's leaking. With your meter set to ohms, you should read several mega ohms in one direction and infinity (OL) with the probes reversed.

mike49504 · 2nd January 2010, 08:23 PM

ok d19 and 20 both read the same set meter to ohms 0.28 in both directions

Perry Babin · 2nd January 2010, 08:26 PM

Out of the board or in the board?

Meter set to ohms or diode check?

mike49504 · 2nd January 2010, 08:41 PM

out of the board sitting on work bench set to ohm 0.28 in both directions

meter set to diode check 0.28 both directions

Perry Babin · 2nd January 2010, 08:59 PM

Replace them to see if that solves your problem.

Remember, be very careful on these boards. They're very easily damaged.

mike49504 · 2nd January 2010, 09:22 PM

Thanks Perry that was the problem amp works great now

2nd January 2010, 10:06 AM	#1
mike49504 diyAudio Member Join Date: Sep 2006	Lanzar Opti 2200 This amp has very very low output. The sg3525a reads pin1=1.24 pin9=1.11 pin2= 1.23 pin10= .04 pin3= .03 pin11=0.41 pin4=0.1 pin12= .01 pin5= 2.05 pin13=8.73 pin6= 3.87 pin14= 0.42 pin7= 2.05 pin15= 13.70 pin8= 4.96 pin16= 5.22 Fet readings are leg1 (gate) 0.42 middle= 13.86 third=0 output readings (tip36c) = leg 1=0.41 middle= 33.99 3rd= -.02 tip 35c = 0.41 middle 34.02 3rd= 0.41 wondering what might cause the very low output

2nd January 2010, 12:18 PM	#2
I Am An Idiot diyAudio Member Join Date: Mar 2007	What is the voltage on pins 4 and 8 of the op-amps? Or pins 4 and 11 if they use a 4 channel amp. __________________ If it ain't broke Don't fix it

2nd January 2010, 05:48 PM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What's the DC voltage on leg 3 of Q48? Place the black probe on the RCA shield ground. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

2nd January 2010, 08:13 PM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Pull D20 and see if it's leaking. With your meter set to ohms, you should read several mega ohms in one direction and infinity (OL) with the probes reversed. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

2nd January 2010, 08:26 PM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Out of the board or in the board? Meter set to ohms or diode check? __________________ 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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2nd January 2010, 08:04 PM	#4
mike49504 diyAudio Member Join Date: Sep 2006	Q48 = 0.64

2nd January 2010, 08:23 PM	#6
mike49504 diyAudio Member Join Date: Sep 2006	ok d19 and 20 both read the same set meter to ohms 0.28 in both directions

2nd January 2010, 08:41 PM	#8
mike49504 diyAudio Member Join Date: Sep 2006	out of the board sitting on work bench set to ohm 0.28 in both directions meter set to diode check 0.28 both directions

2nd January 2010, 08:59 PM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Replace them to see if that solves your problem. Remember, be very careful on these boards. They're very easily damaged. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

2nd January 2010, 09:22 PM	#10
mike49504 diyAudio Member Join Date: Sep 2006	Thanks Perry that was the problem amp works great now

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