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
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
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
A1266
1:13.86
2:13.39
3:13.56
C3198
1:0
2:0
3:0.68
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
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
Last edited:
Removing the 1266 may defeat the protection circuit but you'll have to be careful because it may draw excessive current.
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
With a current limiter in line amp idles about 3-4 amps without it amp idles around 13 amps
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
When testing the output amp has output but very distorted
It's normal for the resistor to get hot.
Is the square wave on all of the outputs swinging cleanly from rail to rail?
Is the square wave on all of the outputs swinging cleanly from rail to rail?
Is the square wave suppose to be there for a sec then nothing then there for a second then nothing and it just keeps doing that
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