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Old 09-30-2020, 08:48 AM   #17
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Join Date: Sep 2020
City & State: Lexington, KY
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Line Voltage: 120VAC 60Hz
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Default Re: troubleshooting definitive technology prosub 60

Originally Posted by momaka View Post
NO problems.
You can check those voltages without Q1 and Q7... and in fact that might be better so you can confirm if your power supply is OK with the output transistors removed. Then once you fit back Q1 and Q7, you can see how they affect the power supply if something is still not quite right.
Attached is a pic of the board where C1/C2 and C3/C4 are. It looks like you either have C1 and C3 or C2 and C4. Since this is the large case I have C2 and C4.

I am using a 100 watt bulb in the dim bulb tester. With Q1 and Q7 removed the lit dimly for a moment and went out. Across C2 I get 168v. Across C4 I get 168 v. Across C2 and C4 I get 360v. Across the + and - of the bridge rectifier I get 336v.
Attached Images
File Type: jpg Caps C1 to C4.jpg (477.1 KB, 10 views)
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