-----Original Message-----
From: Peter Haas <[email protected]>
To: [email protected]
Sent: Sat, Dec 4, 2010 2:49 pm
Subject: Re: G4 DP 450 Gig-E issues
On Dec 4, 2010, at 11:40 AM, [email protected] wrote:
> No power-up light
> Non fans
> No chimes
> No HD spin
The FIRST thing to check is the input power switch.
It has a 115 position and a 230 position.
If placed on the 230 position, but operated on 115 volts, the PSU's "converter
section" is operated as a full-wave bridge, and the intermediate dc bus voltage
will be only 162.25 volts, whereas it needs to be 325 volts for proper
operation.
If placed on the 115 position, and operated on 115 volts, the PSU's "converter
section" is operated as a half-wave voltage doubler, and the intermediate dc
voltage will be 325 volts, as is expected and required for proper operation.
Hi Peter,
Should have mentioned I had verified that already. Pram battery shows 3.69V
although it's about 3-4 yrs old. System was working earlier yesterday but
wouldn't come on a few hours later.
Thx,
BobT
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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]
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