We report on NMR measurements in underdoped Pb2Sr2(Y,Ca)Cu3O8+d crystals. A
pseudogap is observed in the Knight shift and spin-lattice relaxation rate. In
contrast to other underdoped compounds, the pseudogap observed in the Knight
shift is weak and occurs at a significantly lower temperature. On the other
hand, the effect the pseudogap has on spin-lattice relaxation is quite similar
to that in other compounds. The contrast between weak and strong pseudogaps is
discussed.