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Old 21st July 2011, 10:03 PM   #21
m4ick is offline m4ick  United States
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There is also +13.1v and +12.7 at the emitter resistors.
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Old 21st July 2011, 10:10 PM   #22
m4ick is offline m4ick  United States
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And it still does produce -15v for about a second before it disappears. And +15 is steady.
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Old 21st July 2011, 11:00 PM   #23
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The -15v reg could be defective. If you have a 1 ohm resistor, connect it between the 3rd leg of the regulator and the board. Connect a meter directly across the 1 ohm resistor. If the voltage across the resistor never gets near 1v, the regulator is very likely defective. If the voltage across the 1 ohm resistor is 1v or more, the current draw from the regulator could be shutting it down.
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Old 25th July 2011, 07:21 PM   #24
m4ick is offline m4ick  United States
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There is about .2V across the 1 ohm resistor.

I've been looking for the LM7915CT and have found it in a TO-220 and TO-220AB.

What's the difference in those packages?
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Old 26th July 2011, 03:16 AM   #25
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There's essentially no difference.
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Old 2nd August 2011, 07:28 PM   #26
m4ick is offline m4ick  United States
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With the new regulator installed I have a steady +15 and -15. It is still in protect, one channel has no DC and the other shows -.4v and climbing (toward the negatives) at the emitter resistors.
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Old 2nd August 2011, 08:11 PM   #27
m4ick is offline m4ick  United States
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Power supply fets are now getting hot quickly as well.
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Old 3rd August 2011, 01:38 AM   #28
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Which channel has the DC?

Did you replace the power supply FETs?

What work have you done to the channel with DC?
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Old 3rd August 2011, 02:30 AM   #29
m4ick is offline m4ick  United States
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The channel I did not repair has DC in the negatives and slowly going negative.

Replaced PS fets with 75344G3.

None.
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Old 3rd August 2011, 07:21 AM   #30
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Left channel? Right channel?
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