HP HP-Bench-Briefs-1984-05-06 free download

File name HP-Bench-Briefs-1984-05-06.pdf

HEWLETT PACKARD i; SERVICE INFORMATION FROM HEWLET-PACKARD r_-- h * .` MAY-JUNE 1984 Troubleshooting Training Tool: e )>f ... l q /" f-1 c--, I ' Failures Come and Go with a Flick of a Switch! r This is the rear (trace) side of a "bugged" board used for one of HP's service seminars. The DIP switch package is epoxied to the board, and wires run from the switches to various nodes. Seven different "failures" can be simulated by opening or closing the switches. This helps service seminar labs go more quickly and smoothly! Dave Engelder, Hewlett-Packard DIP switch package t o the rear i m p o r t a n t nodes, s o t h a t ! (trace) side of the PC boards, and troubleshooting the failure helps If you teach service seminars, you've then ran wires from the switches to s t u d e n t s t o l e a r n t h e most probably heard this before: "We need the nodes I wanted to "fail." (You important ideas. Plan the routing a better balance of lecture and lab!" might consider covering the rear of the wires carefully. surface of the board to discourage When it comes to service training "cheating.") Then it was a simple For digital failures, simply con- or hardware troubleshooting sem- m a t t e r of setting a switch and nect the chosen node to ground inars, this is probably the most installing this modified board into through the switch. (Most TTL common criticism students make. the instrument to create a failure devices can withstand a short t o Students must have an opportunity for students to troubleshoot. After ground indefinitely; this is not t o actuallly troubleshoot realistic they found the fault, it could be true of a short to +5V.)You can failures-with "hands-on" labs-to removed-and a different one also insert the switch i n the practice and retain what they learn installed-in a matter of seconds. signal path, i.e., closed is normal, in le