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Old 30th January 2016, 12:00 PM   #11
S Merlington is offline S Merlington  United States
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Join Date: Jun 2012
Sorry my mistake I replaced Q311 with the A06

Yes IC104 and IC105..

I don't think the power supply is working correctly

On some of the power supply fets i get 13 volts on the middle leg on the others I get 0.04 on the middle leg
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Old 30th January 2016, 12:06 PM   #12
Perry Babin is offline Perry Babin  United States
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You may have blown surface mount fuses. They're under the transformer. They're no fun to change. You can jump one of the open fuses (there are multiple in parallel in two or four groups) with a wire for testing (through a limiter).

As soon as you get it to power up fully, quickly re-check the voltage on Q304/11. If the voltage is greater than about 70v (referenced to ground), change the 06 to an MMBTA42.
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Old 30th January 2016, 12:16 PM   #13
S Merlington is offline S Merlington  United States
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Checked all of them and they test good ..

I redid some solder connections and on half of the fets I get 13 volts on the middle leg and the other half I get 7 volts on the middle leg .

Is this normal or where should I start to check ?
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Old 30th January 2016, 12:18 PM   #14
Perry Babin is offline Perry Babin  United States
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Are all of the external fuses good?
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Old 30th January 2016, 12:20 PM   #15
S Merlington is offline S Merlington  United States
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Yes
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Old 30th January 2016, 12:26 PM   #16
Perry Babin is offline Perry Babin  United States
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Do you read 0 ohms from leg 3 to ground for all of the PS FETs?
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Old 30th January 2016, 12:35 PM   #17
S Merlington is offline S Merlington  United States
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No

On some I'm getting 0.04 ohms

On the others I get no reading at all meter stays at OL
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Old 30th January 2016, 12:38 PM   #18
Perry Babin is offline Perry Babin  United States
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That probably means that the power supplies are being driven in h-bridge configuration. This is going to make it more difficult to troubleshoot without a diagram.
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Old 30th January 2016, 12:46 PM   #19
S Merlington is offline S Merlington  United States
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After reflowong the solder on the legs of all the power supply fets this is what I get now ..

On half of them I get 0.04 ohms to ground

On the other half I get 15.12K to ground ..

So I'm gonna need a schematic to figure this out correct?
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Old 31st January 2016, 09:11 AM   #20
Perry Babin is offline Perry Babin  United States
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I can't say whether you'd need a schematic to repair it but I'd probably need one to help if the power supply has no bad components but won't start.
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