Scan of the original 65-page operating manual for the Yaesu FT-990. Contains technical specifications, accessories + options, installation instructions, controls & connectors description, operation instructions, CAT system control, block diagrams and circuit diagrams.

Extensive 348-page service manual containing block diagrams, circuit diagrams, print layouts, parts list and exploded views of all parts of this model.

Single-page document describing 2 mods by Steve Ellington.

Information on the "surge protector diode" problem. by Larry W9MDX. Single-page text document.

Kenwood service bulletin 10/11/1996 describing EPROM replacement to fix problem of the TS-870S where is repeatedly switches between receive and trasnmit. Single-page text document.