On Oct 19, 2010, at 11:29 AM, James Morgan wrote:
... After considering several options I decided to take the power
supply out of both computers and send them to National Ram
Electronics at Alpine New York for repair. They charge $89.00 for
repair. Cost me about $14.00 to ship the 2 power supplys and they
paid the return shipping. ...
PSUs are generally considered to be non-repairable.
The main issue is the extra-high voltage present within the housing,
about 325 volts with considerable current behind it thanks to the
(usually) two large converter filter caps.
There is a converter (simple) and one or more inverters/regulators
(complex) in a PSU.
If, as is common, the failure is in the converter, replacing the
diodes and the capacitors often cures the problem.
If, as is uncommon, the failure is in the inverter, there is no easy
way to fix these subsystems except techniques which are far beyond
even an experienced PC/Mac technician.
It is a fact that ONE Mac employed a generic PC PSU: the Beige G3
Mini-Tower, for which installation of a generic PC PSU is possible.
The DT and AIO versions of the Beige G3, however, employed a
proprietary Apple PSU.
For this purpose, the Beige G3 motherboard has a jumper block on it
which selects generic PC mode or Apple PSU mode.
If all that is faulty is the PSU's fan, then this can be replaced by
a generic fan of identical size and voltage (usually 12 volts dc).
--
You received this message because you are a member of G-Group, a group for
those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs.
The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette
guide is at http://www.lowendmac.com/lists/netiquette.shtml
To post to this group, send email to [email protected]
For more options, visit this group at http://groups.google.com/group/g3-5-list
