R7000.15 Bulletin #: 11688-001 Date: April 25, 1988 Subject: To improve audio quality in SSB operation Procedure 1. Remove the top and bottom cover from the radio. 2. Remove the PLL board from the radio. 3. Change IC-1 from a MA78M08A to a MA78M08 (ICOM P/N 900- 00191) on the PLL board. 4. De-Solder and remove the VCO from the PLL board. 5. Change C6 (33 mf 10V electrolytic) to a 220 mf 10V electrolytic (ICOM P/N 918-01477). Install shrink tubing on the capacitor leads. 6. Change C17 (33 mf 10V electrolytic) to a 220 mf 10V electrolytic (ICOM P/N 918-01477). Install shrink tubing on the capacitor leads. 7. Reinstall the VCO unit on the PLL board. 8. Install the PLL board in the radio. 9. Replace the top and bottom cover. Bulletin #: 13889-015 Date: April 1, 1988 Subject: If display fails to operate at power on Procedure 1. Remove the top and bottom cover from the radio. 2. Remove the front panel sub-assembly from the main chassis of the radio. 3. Remove the DC to DC converter from the radio. 4. Replace the following parts on the indicated boards. Current New ICOM Designator Part Board Part P/N Q1 and Q2 2CS1214 DC to DC Converter 2SC2655 906-00385 R1 and R2 3.3 K DC to DC Converter 5.16K 915-01173 C2 and C4 DC to DC Converter .001mf 50V 918-01500 Q11 & Q12 Display Board 2SC2655 906-00385 R31 & R32 3.3 K Display 5.16 K 915-01173 C13 & C16 Display .001mf 50V 918-01500 5. Reassemble the boards and front panel on the radio. 6. Reinstall the top and bottom cover on the radio. 7. Test