Measuring regulator values on H745

I worked on a BA11K PSU just a month ago. One 5V brick was defective ... You are correct, the blue wire (there is just one blue wire to the distribution panel) is indeed -15V. What is happening to the H7441 when you try to make a measurement puzzles me, though. Most of the power bricks only need 20-30 VAC input, so with a small 1A. transformer that puts out some 24V, you can check the brick on the bench outside the BA11K, which is a lot easier to work on. The "bad" news is that there is on exception, the H745 ... that one needs, besides the 20-30 VAC, also +15VDC for proper operation. But as discussed in another thread, a good bench has a laborytory power supply ... - Henk, PA8PDP. ________________________________ Van: cctalk-bounces at classiccmp.org namens Wolfe, Julian Verzonden: di 10-01-2006 22:05 Aan: 'General Discussion: On-Topic and Off-Topic Posts' Onderwerp: Measuring regulator values on H745 Okay, I was trying to find out if my H745 is shady, so I busted out the DVM and put the probes on the blue wire and a ground wire. (blue is supposed to be -15v) Nothing. Okay, so just to check my logic, I hooked the probe to what is supposed to be a +5v line and a ground on the same connector, and the light on the 7441 regulator goes out. Nothing on the DVM. The DVM is set to "20" in the "DC volts" area (it's one of those yellow dial type DVMs) Deposits work, but exams cause a bus error. My power supply isn't shot in all areas, so how am I measuring this wrong? I'm measuring at the power control board, where the backplane connectors are plugged in, and I'm using the BA11-K manual and prints as a reference for the wire values. What am I doing wrong? This message and attachment(s) are intended solely for the use of the addressee and may contain information that is privileged, confidential or otherwise exempt from disclosure under applicable law. If you are not the intended recipient or agent thereof responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by telephone and with a "reply" message. Thank you for your cooperation.