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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment.

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Old 8th Jun 2019, 8:36 am   #21
1976saint
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Default Re: Aiwa HT-DV90 Help (no power)

@Chris55000

Are you still thinking of providing a revision sheet at all?

Paul
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Old 20th Jun 2019, 6:47 pm   #22
Silvered_Mica
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Default Re: Aiwa HT-DV90 Help (no power)

Well I have updated the diagram as I see it from the pictures you have posted. The modification I did to the diagram is a bit untidy as it's freehand, done in red for clarity.

Are you sure the resistor is open as I can't see any fault condition that would open a resistor of that value/rating in that position?

"If that board burn between C653 and the link wire is a piece of track blown out then it's possible that IC67 has failed."
Try de-soldering one side of that wire link that I mentioned in a previous post and locate IC67, check for low resistance/short on pins 5 and 8 if it's low or short then the chopper device inside IC67 has failed.
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File Type: zip Aiwa HT-DV90_PSU.png.zip (323.8 KB, 39 views)
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Old 30th Jul 2019, 6:58 am   #23
1976saint
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Default Re: Aiwa HT-DV90 Help (no power)

Thank you, I will take a look at the diagram and let you know.
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