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mike49504 3rd January 2011 02:53 AM

Team Cactus 7kw
 
I got this amp in for repair and it had blown outputs and driver ic's I put new outputs in the amp Output driver board is still out of the amp.

Amp is stuck in protection mode Heres the voltages i have.

LM293
1:0.16
2:13.86
3:5.05
4:0.00
5:1.38
6:3.97
7:0.17
8:13.87

TL494
1:0.06
2:5.05
3:4.90
4:5.02
5:1.49
6:3.73
7:0.00
8:13.86
9:0.00
10:0.00
11:13.86
12:13.86
13:5.05
14:5.05
15:5.05
16:6.58

Perry Babin 3rd January 2011 03:26 AM

Pin 16 is shutting it down.

mike49504 3rd January 2011 03:59 AM

There are 2 transistors near the 494 an A1266 and a C3198 This is what i have for voltgaes on thoose

A1266
1:13.86
2:13.39
3:13.56

C3198

1:0
2:0
3:0.68

Perry Babin 3rd January 2011 04:10 AM

Is pin 2 of the 1266 connected to pin 16?

mike49504 3rd January 2011 04:13 AM

A1266 middle pin goes to a diode then goes to a 100K resistor then the resistor is directly connected to pin 16

On the diode that connects to the middle pin of the 1266 has 13.28 volts on both sides of it then the resistor has 13.28 volts on 1 side and 6.60 volts on the other that connects to pin 16

Perry Babin 3rd January 2011 04:26 AM

Removing the 1266 may defeat the protection circuit but you'll have to be careful because it may draw excessive current.

mike49504 3rd January 2011 04:43 AM

With the A1266 removed amp powers up .

With a current limiter in line amp idles about 3-4 amps without it amp idles around 13 amps

Perry Babin 3rd January 2011 04:45 AM

Is anything getting hot?

mike49504 3rd January 2011 04:48 AM

I only let it idle for about 10 secs without a limiter and none of the fets got hot .

mike49504 3rd January 2011 04:57 AM

Dont know if its normal but i tested for output and my 1 ohm 25 watt current limiter is smoking .


When testing the output amp has output but very distorted


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