-
- Posts: 2
- Joined: Thu Nov 23, 2017 1:56 pm
I have an HP 5890 Series II GC into which I have installed a TCD. When powering it up, however, the solenoid valve wouldn't switch. Some testing on the board that I bought off eBay revealed two shorted diodes. One of them appears to be a rectifier diode (no problem to get that), but the other one is either a Zener or a Shotkey (I don't know if that's how that's spelled).
Does anyone have any further information about that diode? What's the power rating and breakdown voltage (assuming it's a zener/shotkey)? Looking at pictures of other boards it appears that the rectifier and zener diodes are wired in parallel, and that various other brands of diode have been used there in the past. I've looked at the writing on the diode, but it didn't reveal anything.
If someone has a wiring schematic of the board, that would also be immensely appreciated.
P.S. Alfonso -- no thanks, I don't need your services.