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- Model: IC-RP1210
-
- Division: Amateur
-
- Note: This service bulletin is meant for technical per-
- sonnel with experience working on solid state com-
- munications equipment. Damage caused by im-
- properly installing this modification may cause
- ICOM to charge for subsequent repairs to the
- product. ICOM does not warrant this modification.
-
- Bulletin #: 27687-008
-
- Date: October 2, 1987
-
- Subject: If PLL unlock occurs at power-up
-
- Procedure
-
- 1. Remove the bottom cover from the repeater.
-
- 2. Remove the PLL board from the repeater.
-
- 3. Add a 470 pf ceramic disc capacitor to the bottom of the PLL
- board from IC4 pin 7 to ground on the PLL board.
-
- 4. Reinstall the PLL board in the repeater.
-
- 5. Reinstall the cover on the repeater.
-
- 6. Check the function of the modification.
-
- Bulletin #: 10789-001
-
- Date: April 18. 1989
-
- Subject: When the power is applied to the repeater the
- CTCSS is enabled automatically. If it is desired
- to disable the CTCSS at power up this modification
- may be made to the repeater.
-
- Information: On the control unit IC8 is a dual D type of latch.
- The Q and not Q outputs on this IC control the
- CTCSS enable line. To disable the CTCSS encoder
- at power up or system reset pins 12 and 13 on IC8
- must be exchanged.
-
- Procedure
-
- 1. Remove the control board from the chassis.
-
- 2. Cut the trace going from R20 to pins 9 and 12 on IC8.
-
- 3. Cut the trace going from J2 to pin 13 on IC8.
-
- 4. Add a jumper wire from the land cut on R20 to pin 13 on IC8.
-
- 5. Add a jumper wire from the cut trace on J2 to pins 9 and 12
- of IC8.
-
- 6. Reinstall the control PCB back in the chassis.
-
- Operation
-
- After this modification is made A125 will turn the CTCSS on
- and A126 will turn the CTCSS off.
-