Here’s a Hammond B3 / C3 User Manual in PDF format. The manual applies to both the B3 and the C3 equally, since the only difference in these models is the different cabinet. Much of it will also apply to the A-100 series Hammonds, which also have a power- and a reverb amp, not found on the B3 or C3, but use the same  tone generator,  pre-amp and other components as these models.