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HamCall (October 1991)
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rp2210.txt
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1990-10-14
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Model: IC-RP2210
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 #: 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.