Apple Lisa 1.2A Power Supply Not Working

From: <austjeremy_at_email.domain.hidden>
Date: Fri, 22 Feb 2019 14:06:52 -0800 (PST)

I recapped my 1.2a power supply. I recapped it with the same type of capacitors that I have used a few times before. The power supply was working prior to recapping. Although, it would shut off unexpectedly. When I powered it on for the first time after recapping, the mpu131 transistor, at cr21, blew. I replaced the transistor but it will not power on. If anyone could give me some details how to narrow down the problem I would be grateful. I did try googling this question prior to asking. I tried reading how to put the power supply under a dummy load, so I could test the voltages. Unfortunately, unless I see what it looks like visually, I'm pretty confused how that works.

-- 
-- 
-----
You received this message because you are a member of the LisaList group.
The group FAQ is at http://lowendmac.com/lists/lisa.html
To post to this group, send email to lisalist_at_email.domain.hidden
To leave this group, send email to lisalist+unsubscribe_at_email.domain.hidden
For more options, visit this group at http://groups.google.com/group/lisalist
--- 
You received this message because you are subscribed to the Google Groups "LisaList" group.
To unsubscribe from this group and stop receiving emails from it, send an email to lisalist+unsubscribe_at_googlegroups.com.
For more options, visit https://groups.google.com/d/optout.



text/html attachment: alternate version of message

Received on 2019-02-22 17:09:53