Audison sr1dk in protect!

[Perry Babin]

Do any of the op-amps have any significant DC on their output pins?

 

[Basshead1989]

I will check asap perry should I put black probe on the ground pin of the op amps?

 

[Basshead1989]

Ok this Is what I got on the op amps black probe on the op amps ground pin and red on the output pins which are pins 1&7. So most of them read the same which is
11.6_11.7vdc on pins 1&7. But on ic#4 pin1 read 1.2vdc and pin7 11.8vdc. An on ic#5 pin1 read 11.7vdc and pin7 22.8vdc an it would drop down to 13.2vdc and climb back up to 22.8vdc over and over!..

 

[Perry Babin]

Repost the voltages using the RCA shield or the main ground as the reference (black probe). Post in a vertical column. You can copy and paste these. Use a separate column for each IC.


Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:



Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:

 

[Basshead1989]

Ok I will get on it there is 10 op amps so it might take me alil bit to write them all down. But ill post back asap..
Thanks perry

 

[Perry Babin]

For now, just repost the ones you did above.

 

[Basshead1989]

Ok here you go.
Ic#4
Pin 1: this pin kept changing from -10.2 then to 0.140
Pin 2: 1.006 then 0.140
Pin 3: 0.140
Pin 4: -11.62
Pin 5: 12.01
Pin 6: 0.156
Pin 7: 0.156
Pin 8: 0.156

Ic#5
Pin 1: 0.141
Pin 2: 0.141
Pin 3: 0.141
Pin 4: -11.87
Pin 5: 12.28
Pin 6: 3.7-4.8 kept changing
Pin 7: 0.9-4.0 kept changing
Pin 8:0.9-2.9 kept changing
PIC BELOW of the Ic,s in question.

 

[Basshead1989]

L11 the inductor is getting warm is that normal?

 

[Perry Babin]

You're missing the +15 supply voltage on pin 8. Is the +15 regulator working?

+15 is generic for the low voltage supply. It could be 10-15v.

 

[Basshead1989]

Ok I check all regulators this is what i got.
Q15.
1.11.82
2.11.80
3.11.12

Q57
1.-11.45
2.-25.22
3.-12.22

Q58
1.11.91
2.25.66
3.12.60

Q59
1.-48.64
2.-35.80
3.-47.98

1=E 2=C 3=B..

 

[Basshead1989]

Here's some pics of regulators

 

[Perry Babin]

It looks like Q57/58 are the regulators. If Q57 emitter connects to pin 4 of the op-amps. Find the break between the Q58 emitter and pin 8 of the op-amps.

 

[Basshead1989]

Q15

 

[Basshead1989]

Ok will do when I get off work tomorrow Perry..

 

[ppalli]

I think you confused pin 5 to pin 8....check again


°_____
| 1 8 |
| 2 7 |
| 3 6 |
| 4 5 |
--------

 

[Perry Babin]

Good catch. I missed that.

 

[Basshead1989]

Yup sure did good spot ppalli so sorry guys I'll redo them tomorrow after work thanks

 

[Basshead1989]

Ok I here's the op amps in the correct order.
Ic#4.
Pin 1: -10.30
Pin 2: 1.018
Pin 3: 0.139
Pin 4: -11.74
Pin 5: 0.156
Pin 6: 0.156
Pin 7: 0.156
Pin 8: 12.14

Ic#5
Pin 1: 0.140
Pin 2: 0.140
Pin 3: 0.140
Pin 4: -11.70
Pin 5: 11.34
Pin 6: 11.38
Pin 7: 2.4-6.4
Pin 8:12.19

 

[Perry Babin]

Does anyone have a copy of the diagram for this amp that they could post?

 

[Basshead1989]

But I think I have a bigger problem so I probed the output pads to see if my voltages were still were they were supposed to be and now there off!
Low side fets.
G.-64.45
D.0.010
S.-58.00

High side gets.
G.0.011
D.64.25
S.5.43
Black probe was on center tap I believe!