Hello all, we usually have a pile of these at work in the to-be- repaired bin. Most of the time it's just the batteries, but I have one that needs a little love. It had a bad fan- a simple problem. After replacing the fan with a similar type and powering the unit back up, one or more relays clicked rapidly and then Q42 and Q44 burned. The fan also tried to spin up then stopped. In all schematics I've found these transistors switch the relays, but on the board there are clearly different transistors (Q11,Q18,Q23,etc) for the relays. Q42, Q44 don't seem to have anything to do with the fan either, so I'm wondering whats going on here. Thanks!
- posted
15 years ago