Recapping PowerBook AC Adapter M5140X 7.5V 2A - caps?

[bibilit]

I have repaired another pair yesterday.

After a complete recap, one is working fine and is able to boot properly my Powerbook, while the other is displaying more than 9 volts once plugged, then drops also down to nothing.

I am suspecting the Optocoupler in the side board... have ordered a few.

reference is PC113 and made by Sharp in the first place, i think this part is exactly the same unit used in LC PSUs (and i also have a faulty unit expecting repair)

Will let you know.

 

[bibilit]

No chance, replaced the optocoupler with a new one, but the PSU is acting the same way, when plugged, the PSU is delivering more than 10 volts, then the output is decreasing gradually, also replaced a Zener at the same time...

Will probably keep it as spare.

By the way, the Powerbook 150 PSU ( i talked about it in another post) made by Delta and not by Sony seems to be more reliable, only one capacitor in the secondary side (Rubycon IIRC and not Elna) 

 

[techknight]

its probably the controller IC. 

You should use an isolated scope and check the drive waveform coming out of that puppy. 

 

[bibilit]

Ok, thanks.

 

[desertrout]

For additional reference, here is the capacitor list and dimensions for the M5140 (APS-20U) - North American version, which appears to be slightly different in its construction from the European version, and the cap at C151 has different ratings:





Position



Capacitance



Voltage



Operating Temperature



Height



Diameter



Lead Spacing



Replacement Part #





C108



47µF



400V



85oC



25mm



16mm



7.5mm



EEU-ED2G470





C111



47µF



50V



105 oC



11mm



6.3mm



2.5mm



493-1896-ND‎





C151



33µF



35V



85 oC



11mm



5mm



2mm



493-1856-ND‎





C201



1200µF



16V



105 oC



31.5mm



10mm



5mm



P12367-ND‎





C202



180µF



16V



105 oC



19mm



6.3mm



2.5mm



493-14370-ND‎





C207



82µF



16V




 not listed



15mm



5mm



2mm



493-1778-ND‎





C252



1µF



50V



85 oC



6mm



4mm



2mm



493-5954-ND‎








The part #'s are what I used for a few of these, all in stock at Digi-Key Canada.