>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 <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac <http://lowendmac.com/lists/support.html> PowerBooks list info: <http://lowendmac.com/lists/powerbooks.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/powerbooks%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
