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ESG D4000A problems

Question asked by sm7ovk on Feb 7, 2011
Latest reply on Jan 29, 2016 by BurkettC

I'm trying to repair a ESG signal generator. Error is most probably on board 4400 60002 where there are some MMICs marked 641. Does anybody has a CLIP or knows what type of MMICs this is? Could it be MGA-64135, (?).

There is also another ic at the output from this board. It might be U203 but I'm not sure. What type of IC is this? Golden flatpack with 8 pins.

The fault is that the 9V is badly loaded by this board and perhaps somebody has seen this error before?