![]() Unfortunately, I suspect that cycling the power a few times during the checkout has resulted in something else failing, because now the display shows overload on all modes/ranges (it blinks 0.0000). Replaced both of the transistors just to be sure (used TIP31/32, though the pinout is different) and voltages look fine now. One of them didn't measure quite right so I took it out and in the process saw that the leads had separated from the package. ![]() New filter caps didn't help, so I looked at the series pass transistors (MPS-U05/U55). I started by looking at the PSU voltages, which were on the low side. Unfortunately, when compared to my voltage/resistance references and my other DMMs it's definitely out of cal now. It's pretty nice for a manual ranging DMM and has current measurement too. ![]() I've had this unit longer than any other piece of gear I must have picked it up in the late 80s at a hamfest. ![]()
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