1985 Nissan Maxima 1985 Nissan Maxima no start

Long story but I have been trying to help this elderly lady with her car. It wont start, I checked spark, none. Checked with a TEST LIGHT distributer output because a shop had said the crank angle sensor was bad. No signal from the distributer (using a manual so correct wire colors were tested) so we replaced the crank angle sensor (which oddly enough isnt on the crank its INSIDE the distributor. Fortunately the distributer could be dismantled without removal and the part was fairly easy to replace EVEN the slotted tiny ignite wheel for the optical sensor was quick and easy. Still no spark after installation. Again tested wires with test light no signal. Then I thought well my test light is in need of fairly high voltage I would say at least 9 to shine so I looked in the manual I was right the output of the crank angle sensor is only 5 volts, well below what will cause my test light to shine. So I tested the C.A.S wth a volt meter abra cadabra there was the 5 volts coming six times per rotation like it should. However, still no spark the dealer says the COIL TRANSDUCER ASSEMBLY is bad this time and says that it will be almost 600 to replace so she is back in need of my help. Is that the coil itself or is there something that sends a voltage the coil could deal with rather than the C.A.S's 5 volts?

updated 5/26/09
thanks for the reply and the direction, the 83 year old lady had it shop diagnosed and they said crank angle sensor inside the destributor wanted to charge 500 bucks to change it so we towed it back and I changed it with no luck, they said after towing it back to them AGAIN that it was the coil, even after I tested it and the coil was recieving no signal to spark she insisted they were right and I had to put it in no luck again. In my diagnosis and discovery that it wasnt receiving a signal to spark recomended an ignition module (oddly shaped and rather small) we got one and I installed it and low and behold wam bam started right up. Thanks again