Refurbishing a Tektronix TDS7104 Oscilloscope
A hobbyist details the process of refurbishing a vintage Tektronix TDS7104 oscilloscope purchased at a flea market. The article covers technical troubleshooting, including resolving CMOS battery errors and restoring the device's functionality.
Why it matters
It highlights the value of repairing legacy high-end test equipment, which often outperforms modern hobbyist-grade tools despite its age.
A little over a month ago, I ran into a Tektronix TDS7104 at the Silicon Valley Flea Market , where else?
Other than some dirty buttons, a few smudges here and there, and the usual assortment of calibration and asset tracking tags, the unit was in excellent cosmetic shape, but the price tag of $700 was way out of line: as I write this a try-before-you-buy TDS7104 can be had on Craigslist for the same price.
But Paul, the seller/liquidator, has a habit of saying “I’ll make you a deal” and he did before I even asked: $300. That’s still a lot by flea market standards, but a pretty good price for a TDS7104… if you can get it to work.
At home, the scope powered up right away and it booted straight into the main scope application. Other than a screen that was way too dim, everything seemed fine.
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