Coming down in price favorite this post TEKTRONIX 7854 OSCILLOSCOPE 400 MHZ - $199 (Cameron Park) hide this posting unhide http://sacramento.craigslist.org/ele/5762061692.html http://sacramento.craigs

It feels a little like stealing a cookie before dinner and getting away with it...

Well, as I was in the neighborhood... It found its way into the trunk of my car. The horizontal was just the front panel control turned way left. I brought along a probe and both channels are working.

FYI ( no connection to me) http://sacramento.craigslist.org/sys/5737793085.html http://sacramento.craigslist.org/sys/5737793085.html Already have one and trying to convince myself I don't need another

Readout Board definitely bad. Two ICs are so corroded the pins no longer connect and some IC pins fell off when I attempted to remove them using an IC puller tool. The IC pins are not gold plated like

Progress! I have a trace but... Starting from the front panel intensity control, I measured OK all the way to the logic board. The control voltage would vary coming out of Q90A but not out of U99C. Ch

Repair update. I borrowed a working HV set (HV plus Z axis board) and put it in the broken scope. While the working HV set produced a good trace in the good scope (an R7603) No trace in the broken sco

Thanks for the tip, I'll check that.

Fixed, partly After initial HV repairs, turns out my HV probe was failing. I checked the probe against a working 7603 and the HV showed way low. So I purchased a Fluke 27 DMM kit with 6KV probe. Now b

Would a TM515 work? It already has a fan. Bob

The HV diode has been replaced. The symptoms have changed. Now the 15V supply went up about 20 ma to 0.46 amps. The sine wave is 1-2 volts larger, but is clipping. Also the HV is now steady at 1.1 KV

I disconnected the multiplier but left the HV diode connected and reassembled. Now I get nothing. Not even the oscillator. CR1232 measured about 250k ohms forward. I compared a working diode and it is

OK, I will disconnect the multiplier at HV diode CR1232, check the diode, reinstall and recheck with the multiplier still disconnected ( I think I still have some liquid insulation, 3M Scotchkote 4390

In one of my 7603s the HV wasn't working. Found the 15V fuse blown and possible bad HV power transistors. Replaced the 2N3055 power transistors, the four electrolytic capacitors on the regulator board

Just noticed this, no personal connection TEKTRONIX 585A OSCILLOSCOPE SCOPE VACUUM TUBES for Parts or Repair http://sfbay.craigslist.org/eby/bfs/4981118567.html http://sfbay.craigslist.org/eby/bfs/498

There are likely many methods for adjusting the fingers. The method I have used that has worked for me on many Tek devices is with two dental picks. If the finger in not touching solidly enough, use a

Update, Found some boxes mislabeled, and few boxes I missed initially. Update list at: CRT Inventory 2015 Jan 27 http://www.go2geekguy.info/crt-inventory-2015-jan-27.html http://www.go2geekguy.info/cr

I don't lubricate the finger contacts or the cams. When the finger contacts are clean and pressing down correctly, they don't need lubrication. I seem to remember someone commenting that the small wip

Do you have access to another scope so you see if the signal is going through the attenuator correctly? I just overhauled both attenuators in a 485 (including the paper method, but I used 92% isopropy

Another item learned here. Some of the 7603 power supply electrolytic cap leads are also part of the PCB circuit. With a two lead modern cap be sure and add jumpers where necessary. Some members have