BK 1431 oscilloscope schematic

[wa6rui]

I am trying to repair an old scope BK 1431 and I could sure use a good
schematic, a repair manual would be even better!
Any help would me very welcome.
The unit has no trace , no horizontal sweep at all and a dot shows on
the tube but it fades away.
I have replaced most of the capacitors and many resistors all the transistors
test good and I have resoldered all the boards.
I could use some help.
.

THANKS FOR INPUT!

[Bobotsang]

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