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Icom Inc. 

1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003 
JAPAN 
Phone : 06 6793 5302    Fax : 06 6793 0013 
URL : http://www.icom.co.jp/

 

 

 

Page.   2   of    7 

Replace following parts. 

 

Board 

Parts 

Number  Parts Number (Old)  QTY

Parts Number(New)

QTY

Action 

Taken 

Version 

CHASSIS MP34 

8810003170 

8810003370 

Replaced 

All 

versions 

  

  

SCREW(A) 3X8 

SCREW(C) 3X8 

  

  

PA L2 

620003260 

6200001830 

Replaced  All 

versions 

  

  

NL322522T 101J 100U 

NL322522T 100J 10U 

  

  

PA L6 

2040000490 

6140002220 

Replaced  All 

versions 

  

  

EXC-ELDR25C 

LR-270 

  

  

PA 

R41 

7030010660 

  

Removed 

#01 only 

  

  

6.8 ERJ1TY 

None 

  

  

PA 

R41 

7030010570 

  

Removed 

#02, 03, 04, 05, 08, 09

  

  

4.7 ERJ1TY 

None 

  

and 10 only 

PA 

R41 

  

7030010660 

Added 

All versions 

  

  

None 

6.8 ERJ1TY 

  

  

PA 

R42 

7030010660 

  

Removed 

#01 only 

  

  

6.8 ERJ1TY 

None 

  

  

PA 

R42 

7030010570 

  

Removed 

#02, 03, 04, 05, 08, 09

  

  

4.7 ERJ1TY 

None 

  

 and 10 only 

PA 

R42 

  

7030010660 

Added 

All versions 

  

  

None 

6.8 ERJ1TY 

  

  

CTRL 

D25 

  

1750000810 

Added 

All versions 

  

  

None 

UM9957 

  

  

CTRL 

D26 

  

1750000810 

Added 

All versions 

  

  

None 

UM9957 

  

  

CTRL R154 

7030003480 

7030003440 

1 Replaced 

All 

versions 

  

  

2.2K ERJ3GE 

1K ERJ3GE 

  

  

DRV 

R11 

7030000280 

  

Removed 

All versions 

  

  

150 MCR10 

None 

  

  

  

 

 

 

Summary of Contents for IC-746PRO

Page 1: ...the PA driver for the IC 746PRO 7400 series Model All versions of the IC 746PRO 7400 series Symptom No RF power output Cause The driver transistor on the PA stage will be damaged when the transceiver...

Page 2: ...All versions EXC ELDR25C LR 270 PA R41 7030010660 1 0 Removed 01 only 6 8 ERJ1TY None PA R41 7030010570 1 0 Removed 02 03 04 05 08 09 4 7 ERJ1TY None and 10 only PA R41 0 7030010660 1 Added All versio...

Page 3: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 JAPAN Phone 06 6793 5302 Fax 06 6793 0013 URL http www icom co jp Page 3 of 7 Parts Location on the PA board L6 L2 R41 and R42 Schematic Diagram of the PA b...

Page 4: ...2 Kamiminami Hirano ku Osaka 547 0003 JAPAN Phone 06 6793 5302 Fax 06 6793 0013 URL http www icom co jp Page 4 of 7 Parts Location on the CTRL board D25 D26 and R154 Schematic Diagram of the CTRL boar...

Page 5: ...om Inc 1 1 32 Kamiminami Hirano ku Osaka 547 0003 JAPAN Phone 06 6793 5302 Fax 06 6793 0013 URL http www icom co jp Page 5 of 7 Parts Location on the DRV board R11 Schematic Diagram of the DRV board R...

Page 6: ...i Hirano ku Osaka 547 0003 JAPAN Phone 06 6793 5302 Fax 06 6793 0013 URL http www icom co jp Page 6 of 7 Replace the MP34 screws on the CHASSIS board which is fixed to the DRV board Adjust PA Idling c...

Page 7: ...a 547 0003 JAPAN Phone 06 6793 5302 Fax 06 6793 0013 URL http www icom co jp Page 7 of 7 Updated Serial Number This modification has not yet been applied in production units However the serial number...

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