I'm trying to repair an HP 8340A that will not turn on. The fan runs all the time so I thought I'd start with testing A62K1 (Fan Relay) but I don't readily see it on A62 (top of unit). Can someone help me with location and possibly the part number?
Thanks.
Steve
Hi Steve,
Sorry this response comes so late. I need to look into my notifications settings. The relay is mounted in the right rear corner of the unit. You can see it if you remove the right side panel. It's mounted on the same side of the motherboard as the power supply filter caps. The part number is 0490-0618. It's no longer orderable. It's a 2 contact, 5A, 115VAC relay with a 24vdc coil.
As far as not powering up, a very common problem is resistance in the regulator transistor contacts, mainly the 5vdc regulator. These are the TO3 transistors mounted on the big perforated heat sink. The transistors are in sockets. My usual fix is to desolder the sockets from the motherboard and just solder the transistors in.