These oscilloscopes are not easy to repair because the plugin boards are not accessible and we must have extension cards.
For the front end board, it is even more difficult because it would be necessary to have a test bench to make measurements on both sides of the board.
It seems to me essential to have another oscilloscope (working) of the same type to test the cards one by one.
For those how are unaware about, it use a very expensive TDA1541 DAC sought by audiophiles.
I just bought a 2 channel version on ebay, the PM3380B and it arrived as junk.
Everything is broken in to pieces, most likely from shipping damage.
Check if the power supply X2 filter cap and the other electrolytic filter caps have been replaced and if not do so. They can cause complete failure and intermittent problems.Check that.
HighVoltage - you wouldn't be interested in selling the front panel board from that broken 'scope you have, would you?
Well, I have to wait what the claim with the shipping company and the seller will bring.You certainly need to sort out any claim for the damage. Ebay might be of help but it's always possible they will insist on you sending it back to the vendor.
I filed a claim and hope of a partial refund.
The seller claims he packed it well
The shipping company claimed we signed for the acceptance of the package and because of that we released all possible claims.
But.... lets say we will find a way ...Looking at the service manuals I can't see any differences in the front panel PCB between versions - except for the rotary encoders for channel 3+4 position and obviously the rubber membrane. No mention is made of checking a firmware version on the front panel processor.
You have a 4 Channel scope and this one I showed is a 2 Channel scope
Yours is the PM3394 and the one I have is the "B" version (2 generations later)
I am not sure, if this panel would work at all.
Let me remove the front panel PCB from the frame and I will take some detailed pictures for you.OK, that will be useful. Thanks
However I would argue that the seller didn't really pack it well. Unconstrained polystyrene chips and recycled Amazon crushed paper packaging are not really appropriate or adequate for an item the size and weight of this 'scope.Are you having magic powers or how did you know what the seller used for packing this scope.
Are you having magic powers or how did you know what the seller used for packing this scope.It was obvious from your first picture.
It seems the only thing missing to make this a 4 Channel PCB are the two missing encoders.Typically the case for equipment with several options is to have as much as possible of the design common to evry variant with some unused/unpopulated.
So, there you are - we're up an running on the CPU board at least. I hope you all enjoyed the photos and going through a bit of logical hardware debugging (plus a smidgen of luck).Sure did enjoy that, thanks for sharing. :-+
I can see you smile from here. ;)Yes, it's always satisfying to replace a component, switch the equipment on and find it is now working :-/O
Great success on your repair.Thanks - it looks like I have at least one more problem to fix before the 3394 is properly back on its feet. And, of course, fixing one problem in hardware of this age often only enables you to discover the next.
The beauty is, that you can get all the schematics service manuals for these scopes.Not just the schematics but have a fighting chance of actually debugging and repairing the hardware.
The top of the line is the PM3394B with all options installed and extended memory.
Even in today's market with so many digital scopes, I do prefer for some measurements these Philips/Fluke scopes.
If you do a calibration, you need the access code and it is the same for all of these scopes: "32415"Thanks, I think that code is in the service manual
With that you can adjust almost everything in the service menu.
One thing I have been looking for is an extender to have the boards exposed, while the scope is running.Yes - I presume the connectors are DIN41612 so it should be possible to construct an extender.
It is a little difficult to take measurements on the installed boards.
Philips had these extenders developed for the service labs and I have seen them, but never found one that
was available.
And, of course, fixing one problem in hardware of this age often only enables you to discover the next.Which is certainly the case for this 'scope at the moment.
BI1 | BI0 | |
0 | 0 | Text |
0 | 1 | Normal Trace |
1 | 0 | Not Used |
1 | 1 | Intensified Trace |
One thing I have been looking for is an extender to have the boards exposed, while the scope is running.I still haven't checked properly but I'm certain that it's a DIN 41612 (AKA Eurocard) connector.
It is a little difficult to take measurements on the installed boards.
Philips had these extenders developed for the service labs and I have seen them, but never found one that
was available.
I have many of these Fluke Philips Combiscopes and they are usually pretty easy to repair.
Well, sometimes they are beyond repair...
I just bought a 2 channel version on ebay, the PM3380B and it arrived as junk.
Everything is broken in to pieces, most likely from shipping damage.
May be I can salvage some PCB's and the tube.
Here are some pictures, it shows the modular build up of the scope pretty well.
These scopes were state of the art in the 1990th.
I just can't quite picture in my mind whether the key-ways would come out correctlyWhich, after thinking about it, and staring at connector data-sheets, they won't. Humm, back to the drawing board.
With DARLIC's and UFO's it's clear that the design team was just a bunch of Sci-Fi geeks 8)
It loos like you are making great progress.
Keep in mind that the different models might have different tubes, if you are exchanging parts.
Philips made the tube in 3 speeds, the 70MHz, 100MHz and 200MHz versions.
"Watch the CRT and check that no errors are reported. If errors are mentioned, the oscilloscope will need corrective maintenance. The error number indicates in what part of the oscilloscope the fault may be expected." |
HighVoltage (or anyone) - is there any reference as to what "Calibration Error 00c" is?
EDIT: Grrr, why don't these 'scopes have a set of PSU voltage test points :palm:As it happens they are tolerably easy to find on the unused A9 connector
However upgrading the DSO board to 200MHz looks so plausible I'm half tempted to do it just to see how it goes.
You have figured out more about these scopes than anyone else I know.I think if I were able to spend time on the bench every day I would have packed it up to find room for something more interesting and less recalcitrant but as it is when I do find some time it's just sort of still sitting there annoying me that I couldn't fix it :-BROKE
Its pretty impressive how you keep going on this one.