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Ham Radio Version 3.2 (Chestnut CD-ROMs)(1993).ISO
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12at.txt
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1990-10-14
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67 lines
Model: IC-12AT
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 #: 28Oct86-019
Date: October 28, 1986
Subject: Improve RIT and VXO operation
Procedure
1. Replace C116 (1 mf 50V currently) on the Main board with a
.22 mf 50 V capacitor.
Bulletin #: 22987-008
Affected S/Ns: Less than S/N 4101
Subject: Improve the stability of the CTCSS tone in trans-
mit
Procedure
1. Remove and replace the following components:
Component Old Component New
Identifier Value Location Value
C383 470 pf PLL Board Remove this part
R369 39K PLL Board 22K
R370 2.2K PLL Board 2.7K
C102 .0027 mf Main Board .0018 mf 50 V
Bulletin #: 22987-009
Subject: No memory retention and CPU locks up
Information: Lithium battery is dead because D112 is shorting
to the flex board
Procedure
1. Trim excess lead from D112 and carefully re-solder.