Dumping some HP4955A ROMs at the VCF workshop. #TestEquipment #vcfed

Intriguing bit of mystery test equipment at ShopGoodwill. Orange oscilloscope screen?

https://shopgoodwill.com/item/161347236

#electronics #testequipment

I picked up a #tektronix TDS794D 4-channel 2GHz #oscilloscope on eBay. It was listed as broken with failed channels #1 and #2, plus weird power supply issues.

I found the problem with channel #1.

Incredibly, after completely removing the destroyed analog frontend package and cleaning up the board, the scope passes self-test - it seems to check for the presence of a fault, not whether the channel exists at all #electronics #repair #testequipment #fixit