Perry,
After I replaced the op amp I was unable to get voltage on pin 5, 6, or 7. I have 6 vdc on pin 8 and -6 vdc on pin 4. No voltage on pin 2, 3, or 1 either. I took the chip out thinking it was a bad chip and will install a new one now.
After I replaced the op amp I was unable to get voltage on pin 5, 6, or 7. I have 6 vdc on pin 8 and -6 vdc on pin 4. No voltage on pin 2, 3, or 1 either. I took the chip out thinking it was a bad chip and will install a new one now.
The voltage should be very near 0v. The fact that you found ±6v should have told you that you had a good reference point.
I have about 10 to 50 mvdc not much of anything on all legs except on pin 4 and 8. If this sounds right were should I check next I do have audio on pin 5 and pin 1.
No, it seems that the first 2 have 100v, the next have 0 -2 v, the third set has 0.5 v, and the fourth set has 100v.
If that makes since.
If that makes since.
I should proof-read my posts.
What is the DC voltage across the speaker terminals?
What is the DC voltage on all pins of U301?
What is the DC voltage across the speaker terminals?
What is the DC voltage on all pins of U301?
Across speaker terminals is 06
Pin
1=-1.25
2= .295
3= .005
4= -6
5= 0.11
6= -1.296
7= 2.192
8= 6
Pin
1=-1.25
2= .295
3= .005
4= -6
5= 0.11
6= -1.296
7= 2.192
8= 6
Looking at the voltages on U301, it would appear that it's defective. The output voltages are right for the input voltages but the voltage on pin 2 doesn't look right.
Also, confirm that you read 0 ohms between the center leg of Q428 and the positive speaker terminal. Twist the inductor while measuring the resistance to confirm that the connection isn't intermittent.
Also, confirm that you read 0 ohms between the center leg of Q428 and the positive speaker terminal. Twist the inductor while measuring the resistance to confirm that the connection isn't intermittent.
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