Icom IC-R8500 Instruction Manual

Also see for iC- r8500: Service manual Instruction manual Service manual Service manual addendum Service manual

3912 OPTIONAL INSTALLATIONSn CR-293 HIGH STABILITY CRYSTAL UNITA temperature-compensating crystal with a stability of± 3 ppm is built-in to the receiver. For more demand-ing operation, the CR-293 HIGH STABILITY CRYSTALUNIT is available. It has a stability of ± 0.5 ppm.À Remove the bottom cover as shown on p. 37.Á Remove 6 screws from the metal plate, thenremove the metal plate and shield cover.Â Remove 10 screws from the PLL unit, then openthe unit to expose the bottom.Ã Unsolder the feet of the internal crystal unit, thenremove it.Ä Place the CR-293 in the space available as shownin the diagram, then solder its feet into place (6points).Å Adjust the reference frequency using a frequencycounter.Æ Replace the ground spring to its original position.Ç Return the shield cover, metal plate and bottomcover to their original positions.NOTE: The CR-293 is an oven-type crystal unit,and the specified frequency stability describedabove is guaranteed 1 min. after power ON.ShieldcoverPLL unitGroundspringPLL unitCR-293InternalcrystalunitMetal plate