475 sweep problems


Does anybody have any troubleshooting hints why my 475 won't display
a horizontal trace above .5 us? (Vertical is fine). I cleaned all
of the horizontal sweep switch contacts to no effect (and that was
quite a delicate little job). All of the supply voltages are normal,
trigger works well. I am using a CFG250 for the signal source.

I have a copy of the service manual but the timing and horizontal
display switching schemo is illegible (along with the horizontal
amplifier schematic).

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