Electronics > Repair

Fluke/Philips PM3384a combiscope digital trace faults

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DC912:
Guineafowl21, were you able to solve the issue?  I've got a PM3394B with similar symptoms--analog is fine on all four channels, but switching to digital puts the trace above the top of the screen.  I also received an error code 101 when I ran the auto calibration, but the service manual is not a model of clarity regarding the use of the error code.  The service manual indicates that the error code directs you to "where in the oscilloscope" the fault exists, but there is no further explanation of how the error code relates to the operation of the scope, or the boards or components within it. Were you able to get yours working again?

RetiredElectronicus:
Hi all,
I have more or less a similar problem on my combiscope Philips dual channel PM3370A.
Analog is working fine for both channels.
In digital mode, Channel 2 is working ok,however, CH1 is not on the display and when turning on the vertical position button of CH1, the CH1 beam floats from top to bottom or from bottom to top on the display but in the opposite direction of the rotation direction of the vertical position button.
I found a service manual for this scope on the internet but before dismanteling, I wonder of somebody could share information to find and/or to solve this problem.

HighVoltage:
Unfortunately, you have a broken hybrid chip that is unobtanium for a few years already.

shakalnokturn:
Is it the brown thick film hybrids that fail? Anyone tried de-potting and reverse engineering?
If you have any corpses around I'd be curious to scratch into one...

ru_tash:

--- Quote from: HighVoltage on January 07, 2024, 10:11:09 pm ---Unfortunately, you have a broken hybrid chip that is unobtanium for a few years already.

--- End quote ---

Is there any point in doing something to prevent them from failing, maybe attach a heat sink to them?

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