On 2/19/22 14:15, Mark Bielman wrote:
My HP 6033A arrived yesterday (from epay... "guaranteed to work"... HA!) and looks AOK but when powered up,
ALL LEDs light up (normal) and stay that way! (not normal)
Have not opened her up yet but looks like a uP related issue.
Anyone ever work on these? I hope it's not a ROM/GAL issue!
Might be a clue here as I do not "hear" any relay clicks...
I've not worked on one, but the schematics are available. Being a heavy unit that has just been shipped, the first thing that I'd check is for something having dislodged inside; a cable, PCB, etc.
The next thing I'd check is main power. Check the line voltage configuration switches, and see if you get anything past the bridge rectifiers. Looking at the schematic, I see there are a few power rails generated; check them all. The +5V rail can apparently be isolated from the rest of the unit using W2.
These are really nice power supplies; it's worth giving it some attention.
-Dave
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Dave McGuire, AK4HZ
New Kensington, PA
Dave McGuire