Fluke 170-series rotary switch knobs can be removed for cleaning and/or lubrication. The area under the knob can collect dirt and gunk, which will lead to rough operation and possibly even damage to the end stops. But it may not be immediately obvious how to go about getting it apart without damaging something. Follow these steps for easy disassembly.
The fourth generation of the classic Fluke 77 shares the same basic design and circuit board as the rest of the 170-series (175, 177, 179). Apparently a common problem with these circuit boards is the appearance of a white powdery residue that collects in certain areas. A couple have passed my workbench, and I’ve heard reports of more.
Fluke introduced the 8020A in the late 1970s as its first handheld DMM. These 3½-digit, 2000-count models can still be found on the used market, and can still be very useable, if they’re in working condition. Unfortunately though, LCD problems are common on this 30+ year-old device.
This 3½-digit 2000 count manual-ranging heavy-duty multimeter is an interesting example of mid-80s technology. With an impressive safety-yellow thick sturdy o-ring and gasket-sealed case, it looks like it could survive a drop test with the only damages being to the floor it lands on. Ironically, the most serious damage to be repaired was not electronic, but a broken internal screw post, perhaps due to age and over-tightening.
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