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Alpine 3558 wont power up
Alpine 3558 wont power up
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Old 18th January 2019, 03:52 AM   #11
Perry Babin is offline Perry Babin  United States
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All you want to do is reestablish the connection to B+ if that's what's missing. Find the closest cap on the B+ and connect to the IC with a jumper wire.
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Old 18th January 2019, 11:59 PM   #12
bmore5077 is offline bmore5077  United States
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I checked for continuity from cap to cap top to bottom of the board to check vias and to the ic chip pin. It was good. Seems like there is nothing but the 13.2 v from my power supply on this amp no matter where I check. The center pins of the power fets have 13.2v. Oddly on the 40v rails and the capacitors I have like 220mv. Must be something in power section.
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Old 19th January 2019, 12:55 AM   #13
Perry Babin is offline Perry Babin  United States
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Do you have 12v on both terminals of L805?
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Old 20th January 2019, 12:56 AM   #14
bmore5077 is offline bmore5077  United States
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Yes sir I do.
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Old 20th January 2019, 01:11 AM   #15
bmore5077 is offline bmore5077  United States
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Caps have like 220mv
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Old 20th January 2019, 01:35 AM   #16
bmore5077 is offline bmore5077  United States
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Measurements from driver ic 801 on panel main rear. The board has 2 ic chips. One for each side as its split into 2 pieces.
Pin1. 0mv
Pin 2 0mv
Pin 3 .2mv
Pin 4 6.8mv
Pin 5 254.7mv
Pin 6 254.7mv
Pin 7 13.09v
Pin 8 .2mv
Pin 9 8.1mv
Pin 10 1mv
Pin 11 196.5mv
Pin 12 .2mv
Pin 13 .6
Pin 14 1mv
Pin 15 .3mv
Pin 16 .4mv
Pin 17 196.4mv
Pin 18 .790mv dropping steady
Pin 19 3mv
Pin 20 2.6mv
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Old 20th January 2019, 01:39 AM   #17
bmore5077 is offline bmore5077  United States
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The above measures is for one ic chip as I can only get to the rear main board side. The same side that L805 was on. The only one that seems good is pin 7 for remote.
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Old 20th January 2019, 02:19 AM   #18
Perry Babin is offline Perry Babin  United States
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The break seems like it has to be in the rectangle in the attached diagram. It could be on either side of the board.
Attached Images
File Type: jpg 355901.jpg (243.6 KB, 16 views)
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Old 20th January 2019, 02:30 AM   #19
bmore5077 is offline bmore5077  United States
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Ok I'll start trying to track it down. I was thinking that because of 12v at the inductor but not the caps or ic. Thanks for your help.
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Old 20th January 2019, 03:05 AM   #20
bmore5077 is offline bmore5077  United States
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Thanks for taking the time to look at the schematic and help me.
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