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Old 17th April 2012, 10:27 PM   #101
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Well, I have new results

I connected the potentiometer U17 as indicated in Seankane thread, I have also removed R31 and R35

No MOSFET transistor output on the motherboard

When connecting, and testing, the pins on the motherboard of the first group of eight MOSFETs, -9.70v. and 9.68 v. respectively when turning the knob from right to left.
But, to do the same with the other group of eight MOSFETs, and turn the knob, -9.92 v only appear as shown in photo

Which makes me suspect that there is any fault in what belongs to that section, but where? Any hints?

I will order more parts ... (LM6171, HCPL2211, MIC4420, etc. ...)
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Old 18th April 2012, 06:07 AM   #102
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You need to check the input and output of each previous component (driver IC, opto-coupler, op-amps) to see where the input and output don't change together as you turn the pot.
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Old 18th April 2012, 07:01 PM   #103
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Well, I'm here again
I have checked, U5, U6, U7, U8, U9, U10 and U15,

Turning the potentiometer all well regulated, volts positive and negative volt, at its inputs and its outputs, except the output of U15 (pin 7) and the output of U6 (pin 5) to give - 9.70 v always

I'm surprised that the latter are wrong, I have changed recently, is it possible that you are wrong? IC should I check some more? (TL 074, LM6172IM, .....)
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Old 19th April 2012, 01:40 PM   #104
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Hey, Perry, what do you think? the gould or the hameg?

http://www.ebay.es/itm/180864467380?...84.m1423.l2649

http://www.ebay.es/itm/120897679647?...84.m1423.l2649
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Old 19th April 2012, 02:11 PM   #105
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Sorry that I didn't see #103 earlier.

Confirm that the voltage measured directly across pins 2 and 3 of U15 are switching from 1.1v to -0.6v when you go from one extreme to the other with the potentiometer.

If that's right and the output of the opto-coupler isn't swinging to plus and minus 9v, the opto-coupler is defective. I'm assuming that the opto-coupler has approximately 18v across pins 5 and 8.

The scope with the sine wave locked on the display seems less likely to be defective. The one with only two straight traces could have several problems. Either one would should be good enough they are both in good working order.
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Old 19th April 2012, 05:20 PM   #106
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Perry quiet, do not feel, I know I'm patient and wait

I've done the checks that have told me and the voltage measured directly across pins 2 and 3 of the U15 is changing from 1.4V up to -0.68 V when going from one extreme to another with a potentiometer.
Between pins 5 and 8 is 19V
And on pin 7, there is always -9.70 V, while moving from one extreme to another with potentiometer
So I'll order a HCPL2211 (I heard that this IC, it is delicate to handle, is it true?)

Regarding the scope, most likely, I do, is to follow his wise advice, and try to stay with the Gould 300

Thanks again, Perry, and when you receive the parts, tell what happens.
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Old 19th April 2012, 05:40 PM   #107
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I don't know if it's delicate but you should treat is as it is.
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Old 3rd May 2012, 10:49 PM   #108
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Well, I got the A2211 (U15)

And, check voltages, I noticed that when you turn the potentiometer back and forth in the output of this IC, I have, -9.70 v and 7.28v is this correct?
For a comparison with the other IC (U9) I have, -9.90 v and 10.28v Do these tensions should be more similar (7.28 and 10.28)?

I can ride MEHSA strip with all the mosfet?
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Old 3rd May 2012, 11:03 PM   #109
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Don't install the FETs yet.

Measure the DC voltage on U15 with the black probe on pin 5 and the red probe on pin 8. Post that voltage.

Measure the voltage on pin 7 (black probe on pin 5 again).

Post the DC voltage on pin 7 with the pot clockwise and counterclockwise.
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Old 4th May 2012, 12:11 AM   #110
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U15 probe pin8 red and black probe on pin 5: 19.68 v

pin7 (black probe pin5): 0.2 v

DC pin7 right: 7.31 v
DC pin7 left: -9.69 V (with the black probe to negative)

I have also checked U9

DC pin7 right: -10.89 v and swinging ..
DC pin7 left: 7.01 v and down ...
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