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mike49504 2nd January 2010 10:06 AM

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

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

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