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EEVblog 1450- $99 Fluke Combiscope Ebay SCORE

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EEVblog:

--- Quote from: Shock on January 27, 2022, 06:12:51 am ---
--- Quote from: EEVblog on January 27, 2022, 04:46:04 am ---Someone else mentioned this as well, supposedly RIFA caps inside?. If it is the trippler then I don't like my chances of getting a direct replacement  :(

--- End quote ---


There is a bunch of parts units out there, you just need to put the word out. I have two PM3065 and a parts PM3350 playing a crucial life support role, so unfortunately no donors. But here is a sexy PM3055 pic instead.



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I lusted after that scope when I was a kid!

HighVoltage:
Even today these scopes are wonderful and have a place in the lab.
I still have about 20 of these scopes around.

If you need the original Software to control the scope from a PC over RS232 let me know.
You can even take screen shots over the software, which was very special in those days.

Shock:

--- Quote from: EEVblog on January 28, 2022, 10:04:29 am ---I lusted after that scope when I was a kid!

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I know, you told me 9 years ago hehe. I used to lust after Dick Smiths Multiband Receiver due to aesthetics (until I looked inside and saw chinesium). That Philips model is classy though, you could sell a clean design like that (but cut down, with an led screen) even today.

Old Fart Analog Engineer:
REPAIR PM3370B:
Its the Over Voltage / Over Current protection SCR circuit in the "mains" power supply. There is a trimpot to adjust it which works as a voltage divider to set the trip point. It is likely corroded and increases or opens which triggers the SCR to to latch and shut it all down. Clean that with some contact cleaning spray, maybe also "rock" it back and forth a little bit. It is likely to have silver plated contacts, which are tarnished. If it is a "Piher" brand (used throughout European electronics) it is junk. Philips also made some which were marginally better. Also the link to the Forum is wrong.

EEVblog:

--- Quote from: Old Fart Analog Engineer on February 02, 2022, 07:33:46 pm ---REPAIR PM3370B:
Its the Over Voltage / Over Current protection SCR circuit in the "mains" power supply. There is a trimpot to adjust it which works as a voltage divider to set the trip point.

--- End quote ---

There is no trimpot on the board.

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