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IC02GAT
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1990-10-14
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133 lines
Model: IC-2GAT
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 #: 14488-001
Date: May 23, 1988
Subject: If a noise is transmitted when the CTCSS tone is
used.
Procedure
1. Remove the 4 screws from the back of the radio. Remove the
4 screws from the battery plate on the bottom of the radio.
Remove the 2 screws on the side of the radio near the PTT
switch.
2. Remove the covers from the radio.
3. Unplug the speaker and DTMF pad connector from the main
board.
4. Remove the screws that hold the main board onto the stan-
doffs inside the radio. Remove the main board from the
radio and also the shield that is underneath it.
5. Remove the antenna connector from the radio.
6. Remove the screw on the main body of the radio on the left
hand side. This will release the PA brick from the side of
the radio.
7. Remove the 4 standoffs and any screws that are holding the
PLL RF board to the main chassis of the radio.
8. Remove the PLL RF board from the radio.
9. Replace R46 and R47 on the RF board.
Original New ICOM
Part Value Value P/N
R46 10K chip resistor 100K chip resistor 915-01270
R47 47K chip resistor 470K chip resistor 915-04920
10. Reassemble the radio.
Bulletin #: 00389-001
Date: January 3, 1989
Subject: When servicing the radio, the technician may cause
failure of the +5 V source by improperly replacing
crystal X-3. We have seen cases of this occur-
ring.
Information: When replacing reference crystal X-3, the physical
location of the crystal is critical due to close
spacing of coil L-17.
Procedure
1. Make sure the leads of X-3 are insulated with tubing to
prevent shorting. If a short does happen the VCO buffer
signal will be shorted to ground and cause PLL unlock.
2. It is suggested that the body of the crystal as well as the
leads be insulated to prevent contact with L-17 in the VCO
circuit.
3. Do not trim the leads of the replacement crystal as all of
the supplied length is required.
Bulletin #: 13889-006
Date: May 1, 1989
Subject: As the battery nears discharge the radio emits a
"feedback" tone from the speaker
Procedure
Write to ICOM's customer service department for a copy of
this service bulletin.