| Products > Test Equipment |
| HP 1741A oscilloscope - restoration project |
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| timjimbaker:
Sorry guys... Late reply. Busy weekend here... --- Quote ---I'll dismantle the scope sometime during the weekend and post the pictures --- End quote --- Tekfan - That would be amazing but probably above and beyond the call of duty... I hate to take up that much of your time. --- Quote ---But from my recollection if you look carefully you should be able to see from which positions the contacts had been mounted. You can see small wear marks. --- End quote --- HackedFridgeMagnet - Unfortunately no wear marks, not a trace to be seen. The PCB and wafers are in quite good shape aside from the glue problem. --- Quote ---Hopefully you don't have any broken leaf springs. --- End quote --- One is broken. One of the prongs got torn off. I think I'll be able to fashion something to take it's place. --- Quote ---The lube/GLUE like goop is whats left of the original HP lube used on these series of CRO's --- End quote --- Lowimpedance - Wow! Now that you mention it, that makes total sense. The inside of the scope is in excellent shape. I couldn't figure out why that gloop was the only invasion... When someone does something dumb to modify equipment, they usually do more damage than that! I guess it was hard to HP to be able to predict how a particular lubricant was going to perform decades later... BTW, what did you use to re-lubricate the switches? Thanks everyone. Your help is appreciated. -Tim |
| tekfan:
Here are pictures of the switch contacts The contact positions should be exactly the same for the 1741 and 1740 scopes. I think the 1741 has some slightly different resistor values for the slow sweep speed holdoff time. It's a bit longer since you don't want double triggers when storage mode. Main time base switches Delayed time base switches |
| lowimpedance:
--- Quote --- BTW, what did you use to re-lubricate the switches? --- End quote --- I used 'Electrolube brand' part no.SGB35SL (contact treatment grease) to carefully lube the contacts and also applied some to the axle hub. Any 'suitable' grease you can get for electronic use should be okay. (The one I used I purchased from Farnell some time ago, have not looked to see if its still stocked!). I used IPA to remove the fossilized grease (be VERY careful with the switch contacts,they are delicate!). |
| timjimbaker:
Tekfan... Thanks so much! I appreciate you doing that for me. I'd be happy to return the favour anytime. BTW, nice Leslie in the background of one of your photos on this thread. Lowimpedance - Thanks, I'll find something that'll work. Take care guys... -Tim. |
| Martin.M:
hello tekfan, great job, congratulations. The cold scopes are oftleny more complicated to restore then the glowing oldies. I start now the restoration of my second triple nickel :-) greetings from germany Martin |
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