Soundstream Rubicon 302

[mike49504]

Im working on this amp it had power supply and output problems. I replaced the NDP6060's in it with NDP7060's I also replaced the outputs in the amp and emitter resistors.

Amps power light will not light up but its producing rail voltage I have bot + -30volts on the outputs.

This is the voltages i get from the SG3524N DO theese appear to be right or do i have a problem still

1:0
2:2.54
3:0.18
4:0
5:0
6:3.46
7:2.17
8:0
9:4.32
10:0
11:6.92
12:18.86
13:18.85
14:6.93
15:18.85
16:5.08

Power supply Fets
1:6.50
2:13.89
3:0

 

[Perry Babin]

It looks OK. If you move the power supply rail switch to the other position, does the LED light up?

 

[mike49504]

No cant get it to light at all

 

[Perry Babin]

Is that the only problem (does the amp produce clean audio)?

 

[mike49504]

Amp has DC voltage on left channel and right channel is dead

 

[Perry Babin]

Do you have clean audio an the point where R30/32 connect together?

Do you have clean audio an the point where R33/34 connect together?

You shouldn't have more than a few millivolts of DC on either of these.

 

[mike49504]

Where r30-32 meet no signal

R33 and 34 meet no signal

0 volts across the emitters

 

[Perry Babin]

Try moving the airbass switch to the other position and check for signal again. You may need to work it and the other switches back and forth to clean their contacts.

 

[mike49504]

tryed moving the switch about 100 times back and fourth along with the others still no signal.

 

[Perry Babin]

Drive a strong audio signal into the amp and post the op-amp outputs that have signal. You only need to check the output pins of the op-amps.

 

[mike49504]

NE5532AN the following pins have signal on them

2
3
5
6

NE5532AN
1
2
3
5
6
7

 

[Perry Babin]

Post the IC number (U1, U2, U3...) and the output pins of each one with signal on them.

 

[mike49504]

U2
PINS 2,3,5,6 have signal on them Pins 2,6 the signal is clipped

U1 pins 2,3,5,6 have signal on them

Both op-amps have + - 17 volts on them and the rest of the pins are at 0

 

[mike49504]

Perry,

I played around again with one of the switches and i now have signal where r30-32 meet and r33-34 meet

One of the driver boards is getting warm.

Also a tip 102 and 107 in the power supply section are getting warm also at idle maybe the regulators?

 

[Perry Babin]

Q43 and 50 are the regulators.

Do you have audio on the formerly dead channel?

 

[mike49504]

The one channel is still dead and the other has Dc on it

 

[Perry Babin]

For the dead channel, do you have audio on at least one solder pad for the driver board?

 

[mike49504]

Back to this amp again I found a bad op amp and replaced it I of the outputs has 20 volts of Dc on it. I checked the outputs none read shorted but wondering if they are leaking hers what i came up with.

Tip 107
1-2:8.21 reverse probes 1-2:OL
1-3:8.84 reverse probes 1-3:8.84
2-3:OL reverse probes 2-3:1.444

TIP 107
1-2:8.23 reverse 1-2:OL
1-3:8.80 reverse 1-2:8.85
2-3OL reverse 2-3:7.91

Tip 107
1-2:29.41 reverse 1-2 OL
1-3:9.65 reverse 1-2:8.71
2-3:OL reverse 2-3:7.73

TIP 107
1-2:1.516 reverse 1-2:OL
1-3:8.04 reverse 1-2:8.73
2-3:OL reverse 2-3:7.61

Tip102
1-2:OL reverse 1-2:6.00
1-3:8.04 Reverse 1-3:8.06
2-3:6.08 reverse 2-3:OL

Tip102
1-2:OL reverse 1-2:5.98
1-3:11.81 reverse 1-3:11.84
2-3:6.03 reverse 2-3:11.87

Tip 102
1-2:Ol reverse 1-2:7.13
1-3:5.49 reverse 1-3:5.51
2-3:7.13 reverse 1-3 OL

Tip 102
1-2:OL reverse 6.83
1-3:5.21 reverse 1-3 5.21
2-3:6.84 reverse 2-3:OL

Hope you can make out all this Do any appear to be leaking/BAD?

 

[Perry Babin]

You can't determine if they're leaking unless they're out of the circuit.

 

[mike49504]

They are all out of the amp I tested them 3 times out of the amp and thats what i came up with. All the readings i posted were taken with them out of the amp Thats why i was asking the readings look strange to me