Continued...
YHP 4270A automatic capacitance bridgeA recent import from the USA, thankfully it arrived without any damage, but with no top cover, I suspect this spent it's working life rack mounted and the cover got lost, I checked and I don't have a spare.
Also noted was a missing fuse holder cap & fuse, the original line inlet has been bodged to IEC, shame as it's an early one (sn 118), can't complain too much due to how hard these are to find.
The input BNCs have some damage, I need to repair them as they seem custom to this meter. Three randomly disconnected wires were also reattached to the card connectors.
A fuse & cap was fitted, line switch changed to 230V and the lamp limiter used to bring this up.
No smoke and most of the display is working, it seems to be partly working, the highest capacitance range is not though.
Next was checking the display problem, this comes out through the front panel, after removing the trim panel & plastic filter. The problem was quickly found, one decimal readout bulb had rusted pins and had cracked, for some reason one pin was squashed, a NOS replacement was fitted & the display is now fully working. While it was apart I cleaned up the front panel.
Checking a random 100nF capacitor.
David