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Infinity 475a
Infinity 475a
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Old 14th January 2020, 09:28 PM   #1
seankane is offline seankane  United States
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Default Infinity 475a

This amp does not power up. The blue light on the cover and the protect light come on. I've read through a few old posts, seems the problem could be on the pwm board. Probing around with my meter I don't get any odd readings from any devices.


I have zero experience with these amps, anyone have this issue before?
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Old 14th January 2020, 10:48 PM   #2
ultra is offline ultra
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If there is no DC output at any channel when the amp tries to power up, there should be an electrolytic cap close to the opto, replace it.
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Old 15th January 2020, 12:11 AM   #3
Perry Babin is offline Perry Babin  United States
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If you can't find the problem, post the DC voltage on all terminals of the 494.

The 475 service manual is in the infinity folder.
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Old 16th January 2020, 02:49 AM   #4
seankane is offline seankane  United States
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I found the opto's U4 and U5 but don't see any caps around them. The only caps near are on the stand up pwm board. Looking at the schematic 2 caps on that board are tied to the protection circuit.
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