Re: PB 3400 AC adaapter

[ACFX44501]

>I've left the machines powered up overnight and 
>the supply is not overheating.  I have 2 other adapters, one a PB 3400 
>original and the other a Madison Line, both cause the machine to 
>function fully.

Unlike the PG 500 supply, which has four wires, two for powering and two 
for charging, the later "45 Watt" power supply, used with just about 
every machine from the PB 1400 to the Wallstreets, has only two wires.

Powering/charging functions are controlled within the PBs themselves, 
using the single voltage as a source.

Lack of capacity under all loading conditions explains the behavior of 
this specific unit.

Apple provides no testing procedure for these supplies, save substitution 
for a known good one.

Actually, testing is not as easy as it might appear, as the testing must 
be done under a simulated load.

The nameplate capacity of the supply is 24 volts at 1.87 amps, which is 
44.8 watts.

A 12.83 ohm resistor as a load would fully load the supply. However the 
closest standard value is 15 ohms.

A 15 ohm, 50 watt, wire-wound resistor as a simulated load would load the 
supply to 1.6 amps, which may be a good enough test.

With this load applied, you should be able to measure about 24 volts 
across the load resistor. Significantly less than that, and the supply is 
presumed to be defective.


-- 
PowerBooks is sponsored by  and...

  Small Dog Electronicshttp://www.smalldog.com   | Enter To Win A |
  -- Canon PowerShot Digital Cameras start at $299   |  Free iBook!   |

  Support Low End Mac 

PowerBooks list info:   
  --> AOL users, remove "mailto:";
Send list messages to:  
To unsubscribe, email:  
For digest mode, email: 
Subscription questions: 
Archive: 

Using a Mac? Free email & more at Applelinks! http://www.applelinks.com

PB 3400 AC adaapter

[Volk (contractor)]

Good morning,  I am experiencing a problem I've never had before, I have 
an 45 watt AC adapter for a PB 3400 that will power up computers ( 
checked on multiple machines with different batteries) but will not 
charge the batteries.  I've left the machines powered up overnight and 
the supply is not overheating.  I have 2 other adapters, one a PB 3400 
original and the other a Madison Line, both cause the machine to 
function fully.

Thanks
Roger

--
PowerBooks is sponsored by  and...
 Small Dog Electronicshttp://www.smalldog.com   | Enter To Win A |
 -- Canon PowerShot Digital Cameras start at $299   |  Free iBook!   |
 Support Low End Mac 
PowerBooks list info:   
 --> AOL users, remove "mailto:";
Send list messages to:  
To unsubscribe, email:  
For digest mode, email: 
Subscription questions: 
Archive: 
Using a Mac? Free email & more at Applelinks! http://www.applelinks.com