Hi guys,
I just picked up this Valhalla 2500-E current calibrator on eBay that was for parts or repair. I had half hoped that it was simple operator error and that it actually did work, but alas, I didn't get that lucky. I'll post my request up front before I get too far. If anybody has a schematic for the Valhalla 2500-E (NOT 2500EP or 2500EN) I would greatly appreciate getting a look at it. I found a couple of manuals for the 2500EP/EN at Valhalla's site as well as KO4BB, but that seems to be a slightly later model and the schematic is just different enough to make me unsure of myself (did I mention I'm fairly new at this). The 2500E is the older 10A one with the pushbutton range switches shown in the attached pics.
The guy claimed that no repairs had been attempted, and I'll give him the benefit of the doubt, but somebody was clearly in there as can be seen. Sharp eyed folks (and even dull eyed ones) will spot an issue right away. I know what you're saying, "well there's yer problem, there's a giant hole in yer turbo encabulator." Well, yes, there does seem to be a hole where a power transistor used to go, and a missing wirewound resistor, too. Not sure what happened here. An aborted repair, a failed repair, or maybe he just scavenged the transistor (hoping it's this one).
Not sure if this is the only issue, but I'll start here. I found some replacement transistors on eBay after a fruitless search locally, and I think I have some 1 Ohm power resistors I can use, but I would be grateful if someone has or can point me to a schematic for this unit in case I have to troubleshoot this further.
Thanks in advance.