280 E8257D/67D, E8663D PSG Signal Generators Service Guide
Assembly Replacement
A5 Sampler, A6 Frac–N, A7 Reference (Standard and Option UNR/UNX/UNY), A8
Output, A45 Frac-N and A46 Offset
Figure 3-13 A5 Sampler, A6 Frac–N, A7 Reference, A8 Output, A45 Frac-N and A46 Offset
Figure 3-14 W155 Reference (Option UNY) with A45 and A46