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DD Z1a damaged
DD Z1a damaged
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Old 13th August 2018, 01:13 PM   #21
Perry Babin is offline Perry Babin  United States
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For all ICs, what is the resistance from pin 2 to pin 3?
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Old 13th August 2018, 01:16 PM   #22
Achim1409 is offline Achim1409  Germany
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61kOhm
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Old 13th August 2018, 01:18 PM   #23
Achim1409 is offline Achim1409  Germany
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Join Date: Mar 2018
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refurbished all solders at that ic´s. Wasnt enough solder. Now i have signal on all ic´s at pin 6. If i measure on the board, some i think low side have signal, high side not. Is that normal?
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Old 13th August 2018, 01:19 PM   #24
Perry Babin is offline Perry Babin  United States
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Can you desolder and lift pin 2 to measure all individually?
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Old 13th August 2018, 01:20 PM   #25
Perry Babin is offline Perry Babin  United States
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Are the outputs in the circuit?
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Old 13th August 2018, 01:23 PM   #26
Achim1409 is offline Achim1409  Germany
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No, no mosfets installed.

On both sides allway´s the four center mosfets got signal, the outer one not. Checked on the gate resistors without fets.
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Old 13th August 2018, 01:26 PM   #27
Perry Babin is offline Perry Babin  United States
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The reason you don't have high-side drive is because the outputs aren't in. They are used to generate the high side B+. If you use a 9v battery connected across the capacitor across pins 11 and 13, you should get high-side drive. You have to do this for each IC. You can do it individually and check signal then move to the next one.
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Old 13th August 2018, 07:25 PM   #28
Achim1409 is offline Achim1409  Germany
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Ok, so i found plenty ways, how to destroy the drivers very quick. But now i have on all of them a good signal. High and low tested. I think i can install the fets now.
Previous problem was, that after half our of running the audio part exploded. Power supply i tested allready before. There was no problem. Maybe the filter inductors.
Can i take them out, connect them to my lcr meter and heat them up with a hairdryer?
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Old 13th August 2018, 08:32 PM   #29
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
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The problem with removing them is that you may clear the short and not find it, only to have it re-short later.

I'd recommend removing the rectifiers and going to a low-voltage supply. Do you have a ±15v (adjustable?) low current power supply?
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Old 13th August 2018, 09:03 PM   #30
Achim1409 is offline Achim1409  Germany
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No, i havent a Power supply like this.
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