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Infiniium 54825A offset DAC failure

Question asked by Roy on Sep 1, 2010
Latest reply on Sep 10, 2010 by Roy
Hi all,
one of my two 54825A has a offset DAC failure on channel 2. When I set Ch.2 to 50mV/Div and turn the offset **** clockwise the trace goes up, stays at the top of the screen but as soon as the offset level reaches 2.5V the traces jumps to the bottom of the screen (and then moves up again). Self test shows:

Offset DAC failed on Ch.2
A/D value outside limits
Expected output between div-3 and +3, actual output = 4.0 div

From swapping attenuator and ADC I know that they are good. Does someone have a good hint or even better can someone provide schematics?