Metrix ox8620 / ox8627

[stj]

looking for a user manual and/or service manual if anybody has one.

OR info on the part of the circuit related to the Z input,
and how to get the scope to use x10 probes - because i cant find that menu!
and any eprom dumps newer than 1.0 would be good 
if anybody needs them - i dumped the 1.0 roms


i know people have had problems fixing these scopes before,
so i'll say some stuff - having fixed one.

you have to completely strip the unit to remove the baseboard and to do so you must desolder multiple earth wires from the tube, one on the psu heatsink, 2 on the digital card and 2 wires for trace-rotation on the ront-panel

then FULLY recap the baseboard because the original caps are mostly Marcon crap and they do leak and go high-impedence.
dont overlook the ones under the frontend shielding.
i used Panasonic FR for the low violtage and EE for the high voltage ones

also there is a bodged in RIFA soldered under the board across the switching transformer.
you may need to strip the power switch and lube it internally - because good luck finding a new one.

you need to strip the front panel and spray contact-cleaner into the pots and strip/clean the 3 rotary switch contacts/tracks
the pots are terrible and the switches fill with carbon/graphite dust

finally, lose the lithium battery from the digital card - i dont care that it's still 3v - it's 28years old and ready to blow!

it's a nice scope once you do all that btw! 

[stj]

a few bits