Hi Folks!!
I received this ocilloscope as a gift by free, unfortunately it isn't working. I've already have a 500Mhz 54610A, then I guess this would be a good exercise to refurbish mine later.
The scope is in excellent condition, it came from a telco's lab.
After power up no fire and no smoke (fine!), and also no image at all. As an usual tvs repairman I didn't worry and go ahead.
At first I checked the psu and voltages are fine. I'll not recap anything until it will be in working condition.
I checked then crt board and all voltages seems to be ok, the filament is on but video dc voltage was blocking the image. I turn right sub-bright and some image comes. Deflection is ok in both axes but thre isn't any image, just horizontal retrace lines.
Well, then I started to worry a bit, and checked ribbons.
After that and when I took a new detailed review of the main board I took notice there was a missed IC, U42 wich is the EPROM program IC.
Well, I didn't expect that! I can't know if it was lost during some repair task or if someone scrapped it....anyway I need to replace it to go ahead.
Looking at the schematic and also some pics I could check it's a 27C2048.
Then I just need to program it, but I googled a long time without succes. Just could get a 54602A one, and I don't believe that could work.
Why I wrote all this and not to ask directly for the file? I guess it's always useful to explain what we did and to get others as much info as could be possible. In this case I should visually checked deeply before do anything, also under the ribbon wires!!
Well, I'll appreciate if someone could send me a dump of this eprom.
Thanks in advance!
Carlos