u5
1:0
2: 8.33
3: 8.26
4: -9.61
5:0
6: -7.32
7: 9.83
8:0
Are you sure about pin #2? Its a ground, wondering why you have positive voltage on it?
Pin #6 has DC on the output pin.
This IC may be defective.
1:0
2: 8.33
3: 8.26
4: -9.61
5:0
6: -7.32
7: 9.83
8:0
Are you sure about pin #2? Its a ground, wondering why you have positive voltage on it?
Pin #6 has DC on the output pin.
This IC may be defective.
U7
1:0
2: 8.26
3: 0
4: -9.61
5: 0
6: 8.29
7: 9.88
8: 0
This IC has no + input voltage on pin #3 as it should, and has + voltage on the negative input.
1:0
2: 8.26
3: 0
4: -9.61
5: 0
6: 8.29
7: 9.88
8: 0
This IC has no + input voltage on pin #3 as it should, and has + voltage on the negative input.
If this amp was on my bench I would change the MIC4420 and the HPCL2211.
99% of the time when a BD1000 or BD1500 has distorted output this is the problem. Not always but most of the time.
I dont want you to keep changing un-needed parts. You might want to wait for Perry's input.
Usually if you have a bad opto-coupler or driver you can tell by metering the outputs from gate to source.
Do all 12 outputs read the same from gate to source with your meter?
If some read different which ones?
99% of the time when a BD1000 or BD1500 has distorted output this is the problem. Not always but most of the time.
I dont want you to keep changing un-needed parts. You might want to wait for Perry's input.
Usually if you have a bad opto-coupler or driver you can tell by metering the outputs from gate to source.
Do all 12 outputs read the same from gate to source with your meter?
If some read different which ones?
Set it to ohms and leave the range in auto if you have an auto range.
Check all the outputs from leg 1 to leg 3 (gate to source)
Do they all read close to the same or are there 6 that are way different?
This will help determine which driver and opto-coupler is bad.
Check all the outputs from leg 1 to leg 3 (gate to source)
Do they all read close to the same or are there 6 that are way different?
This will help determine which driver and opto-coupler is bad.
what range is your meter in?
The output usually dont read that low.
Did you reverse the probes and test both ways?
The output usually dont read that low.
Did you reverse the probes and test both ways?
From my experience the only pins on U5 that should have voltage are pins 4&7.
U15 should have DC on pins 5&8 and a little on pin 7.
I dont beleive pin 5 on U6 should have any voltage either.
The voltages dont look right on those 3 parts.
Have you compared them to U8, U9 and U10 from the other group to see if your readings are very different?
This would be much easier if you had a scope...LOL!!
U15 should have DC on pins 5&8 and a little on pin 7.
I dont beleive pin 5 on U6 should have any voltage either.
The voltages dont look right on those 3 parts.
Have you compared them to U8, U9 and U10 from the other group to see if your readings are very different?
This would be much easier if you had a scope...LOL!!
tomorrow ill compare u8, u9 and u10. I don't know how to use a scope but I'm going to get one. what probe will I need for a tektronix oscilloscope 465b? THANK YOU Sean for all your help! as You can tell I'm new to this!
Pin 5 of U6 is the output for the driver and it feeds the gate siganal to the gates of the 6 fets in that group.
Thats why I find it odd that you have -8.98 on this pin.
Thats why I find it odd that you have -8.98 on this pin.
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