hi
I am recovering this post because of my progress.
one year after my last reply, I am going on to repair our Philips PM3323 unit.
as
SaabFAN said, the fist solution was to replace ALL axial and SMD capacitors.
my first images were channels completely noise without any trace. today we can see a real signal "with noise", but is a great step forward.
my brother starts changing all axial capacitors with the radial version. (he said that all of them had lost capacity.)
then he checked both channels injecting a signal, following the trace up to the ADC board
(the signal looks "good" and now the problem was on ADC board (P2CCD). no input channels broken/burnt )
and then I changed all the SMD because of the same failure, all capacitors were completely "decap" and with leakage under them.
now we need to check what is the noise reason.
great, we are very happy !!
I know that today there are better oscopes, more portable and lighter
, but I do not spent money for this unit
it was on road to the trash.
it could be a great tool for a RF entusiast as my brother, because this unit has native 50 ohm input and up to 300Mhz !!
(apology for my english but hope you will understand
)
capacitor removed with leakage near
new capacitor and cleaned section
some axial cap replaced with radial version