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The serial capacitor C30 is responsible for the bass roll-off, and 0,22 F is in my opinion the
best value. This value also works great for FM-mode. Decreasing it any further will cut away
too much bass and it will make the HM-151 sound very thin and weak (with decreased
output).
The original size of the C30 capacitor is 1 F, and this is a bigger value than in any other
icom hand microphone I know of. This is why it will allow a lot of bass to pass through, and
this is why it will sound "bassy" compared to other icom hand mics.
First, you must get your hands on the replacement capacitor.
The C30 capacitor should be replaced with a 0,22 F SMD ceramic capacitor called
C3216X7R1H224K. Size/type is 3216 or 1206 (3,2 x 1,6 mm). (also named
C1206C224K5RAC C-7025) ELFA part number : 65-777-04
Replace the C30 capacitor. It is a bipolar capacitor, so there is no + or - on it. Please be
aware of the fact that soldering such tiny SMD components are VERY difficult, if you don't
Summary of Contents for IC-7000
Page 8: ......
Page 9: ......
Page 16: ...Label on IC 7000 box 8 Export model Remove the CPU Logic unit Step 1...
Page 17: ...Unclip the spring clip situated at the back mid right hand side of the radio Step 2...
Page 19: ...Original 5 5 MHz SMD ceramic filters Step 5 New 6 MHz Ceramic Trap Filters Step 6...
Page 23: ......
Page 24: ......
Page 27: ...Remove the CPU Logic unit Step 1...
Page 28: ...Unclip the spring clip situated at the back mid right hand side of the radio Step 2...
Page 29: ...Remove the DDR unit first then the main board Step 3...
Page 31: ...New 6 MHz Ceramic Trap Filters Step 6 Original Diode Positions Step 7...