Modifications for the ICOM - RogerK

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To be neater you could remove the small 0603 SMT resistor and replace it with a 39k 0603 part.To adjust Scope base-line:Trimpot R966 will adjust the base-line of the Spectrum Scope.Thanks to http://www.qsl.net/vk4cp/ for the modification.This modification is read 1768 times.top of page26-06-2001(IC-756) ACC1 Audio Output IncreaseAuthor: Adam MAURER, VK4CP - vk4cp@bigpond.com.MODIFICATION.NETAccess to the Main Unit is required.The "Line Level" audio output on pin 5 of Rear panel connector ACC1 is very low, with the manual stating 300mV. Normal LineLevel is regarded as about 700mV. Although my MiniDisc Recorder had a gain control for its Analogue I/P it still couldn't make 0VU. Here, by adding two resistors we can increase the gain of the audio appearing on pin 5 of ACC1.●●●●●●●●●Remove the bottom cover.Remove 6 screws holding down Main Unit.Remove screw on rear panel inbetween ALC & Send RCA sockets.Remove heatsinking clip holding transistor to chassis.Remove flat ribbon cable to J3 in far right corner.Carefully pry PBA loose and fold over - see at left.(I actually had to remove RF Unit shield and loosen a shielded cable to allow the Main Unit PBA to fold out).Locate IC-503, a NJM2058 OPAMP in an SMT SOIC14 package.Remove W3 0603 SMT link.Fit an 10k 0603 SMT resistor in W3's place.
●Fit a 1/8w 5k6 through hole resistor from IC-503 pin 9 to ground.We have effectively changed the OPAMP IC-503c from being a unity-gain follower into a non-inverting amplifier with a gain ofapprox 2.5.Thanks to http://www.qsl.net/vk4cp/ for the modification.This modification is read 1531 times.top of page26-06-2001(IC-756) General Coverage H.F. TX Mod (1.6 - 30.0MHz)Author: Adam MAURER, VK4CP - vk4cp@bigpond.com.MODIFICATION.NETVHF remains 50.0 - 54MHz TX only.Modification summary:Remove the W805 jumper chip on MAIN unit by soldering iron.Modification Procedure:1. Remove bottom cover of IC-756.2. On MAIN unit board you will see I.F. filters and daughter board (DSP PBA) on the right hand side.3. W805 jumper and IC803 chip located under DSP PBA.4. Remove DSP PBA (lift up carefully!)5. Look for IC803 and line of jumpers (0603 sized SMT links).6. Remove W805 jumper - as indicated below.7. Re-install DSP PBA8. Re-fit bottom cover.---------------[W801] | |[W802] | |[W803] | IC 803 |
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Modifications for the ICOMcreated 2
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(IC-271)(IC-271)(IC-271)(IC-2710)(I
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(IC-475)(IC-475)(IC-475)(IC-475)(IC
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(IC-756pro) Expand tx-freqeuncy for
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(IC-W2E)(IC-W31)(IC-W31)(IC-W31)(IC
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2. After about 0.5 second, press st
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21-10-1999(AT-500) ICOM AT-500 Tune
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4. Program the radio to the local w
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19-07-1998(IC-03) ICOM 02/03/04 & V
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This modification is read 553 times
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6. Reinstall the RAM board into the
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27-10-1998(IC-1275) Power control m
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27-10-1998(IC-1275) Modification of
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●Connect the short plug end with
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This modification is read 1316 time
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50MHz to something like 204MHz cont
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26-07-2001(IC-207) Band Expansion f
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Fig. 3: The circuit extract from IC
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19-07-1998(IC-22) Icom IC22S Packet
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More detailed:In the true spirit of
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19-07-1998(IC-229) IC-229H Fix CPU/
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In addition, if you want to put an
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By diode:●●Remove D17 diode on
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1. Remove diode D14 (if there is an
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cut... I'm guessing, but it could b
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19-07-1998(IC-24) IC-24AT enabling
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19-07-1998(IC-24) Tip to to functio
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This complete the mods done with su
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Comment:These TRX is accorded to my
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this mod of use as I have.Any comme
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other wires come in. Take the cable
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17-11-2000(IC-2700) Enabling ICOM 2
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19-07-1998(IC-271) IC-271 / 471 fue
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RAM card version B images:This modi
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12-11-2000(IC-2710) Crossband Repea
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Note:From Bill K7RIEICOM has not tr
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19-07-1998(IC-275) Improve the stab
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●●●●●●●●●●remov
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Note: a strong signal will be serio
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19-07-1998(IC-28) The long, noisy s
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not a hard mod to do,..........but
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02-04-2000(IC-2800) IC-2800H cross
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19-07-1998(IC-281) Extended Receive
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encased it in shrink-tube. The oper
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push buttonswitch ^ ^| |___________
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19-07-1998(IC-2IA) IC-2IA lousey xm
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1. Change to RECEIVER MODE (not rec
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13.0V 5.0W12.0V 5.0W11.0V 5.0W10.0V
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MODIFICATION (Refer to figure 1.)1.
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Procedure1. Remove the covers from
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19-07-1998(IC-3200) Fix for IC-3200
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4. select a frequency of 150.000Mhz
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19-07-1998(IC-3220) How to iface Ic
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Now power on and type in the freque
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One note on the above - the BNC con
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e shorted to ground and cause PLL u
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19-07-1998(IC-451) IC-451 aus 9600F
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3. If by accident you lose power to
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19-07-1998(IC-475) IC-475 Freq. ste
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Problem:This is a general transceiv
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Note: a strong signal will be serio
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Das spart einen mords Haufen Arbeit
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Dieses ist mit dieser Schaltung als
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X . X . 5.0 KHz 1 0 1 0. . . . X .
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Remove the back cover. If you place
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27-10-1998(IC-575) SSB RF GainProbl
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26-06-2001(IC-575) Pass band Tuning
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The trimpot leads will need to bent
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19-07-1998(IC-706) Info/mods for IC
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¦ ¦¦ ¦¦ ¦¦ ¦¦ ¦----------
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●●●●●●●●●●●
Page 154 and 155: From: gary@ke4zv.atl.ga.us (Gary Co
Page 156 and 157: Mehr Dynamik in der Modulation beko
Page 158 and 159: Operation:Be sure to read the manua
Page 160 and 161: Alternative zum modifizierten PC St
Page 162 and 163: ●●●●●(Another receiver wi
Page 164 and 165: | IC31 uPD4094BG || |1 2 3 4 |5 6 7
Page 166 and 167: This modification is read 411 times
Page 168 and 169: D116 and D118 are responsible for o
Page 170 and 171: Transmit power output after modific
Page 172 and 173: This information and photos was sup
Page 174 and 175: 22-02-2002(IC-706MKII) IC-706MKIIG
Page 176 and 177: This modification is read 2320 time
Page 178 and 179: Delete cap. CT14 at pin 6 of IC3 on
Page 180 and 181: 18-06-2000(IC-729) Using two Icom r
Page 182 and 183: 19-07-1998(IC-735) IC-735 Remote Wo
Page 184 and 185: 19-07-1998(IC-736) Icom IC-736 DDS/
Page 186 and 187: Also probably would apply to IC 735
Page 188 and 189: RAM card version B images:This modi
Page 190 and 191: John Schmitz NS8EAdditional informa
Page 192 and 193: 13-01-2002(IC-746) Monitor Audio Ou
Page 194 and 195: This modification is read 1499 time
Page 196 and 197: 19-07-1998(IC-751) IC-751 Bad Cap P
Page 198 and 199: inspect your job to be sure that th
Page 200 and 201: 28-01-2002(IC-751) ICOM IC-751 Dual
Page 202 and 203: Step 8: Turn the radio off and inst
Page 206 and 207: [W804] | |Remove=>[W805] | CHIP |[W
Page 208 and 209: Date: 23-02-2002 User comment From:
Page 210 and 211: less.The second way to adjust the I
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Page 214 and 215: 19-07-1998(IC-765) Icom IC-765 Pass
Page 216 and 217: 19-07-1998(IC-775) New product info
Page 218 and 219: 70% AM.My personal findings are tha
Page 220 and 221: 11. Re-install board and all cables
Page 222 and 223: The Yaesu FT726R first appeared ten
Page 224 and 225: There seemed to be no way of changi
Page 226 and 227: Add a diode on the blank position b
Page 228 and 229: ---- gar keine Diode ----Breitband
Page 230 and 231: To disable the x-band repeater just
Page 232 and 233: Well this should make things verry
Page 234 and 235: Set radio in VFO mode, and select f
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Page 238 and 239: ●●●350-470 MHz RX/TX800-950 M
Page 244 and 245: 1. You're completely successful.2.
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Page 248: 28-03-1999(IC-Q7) Modifying the ICO
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You should now have the RF board co
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BOOT:Attenuator protecs strong sign
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1. Use an ohmmeter to determine whi
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2. Remove battery cover and battery
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Fig. 4. Receiving AO-40 (at MA=13)O
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This modification can also be found
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The Q and not Q outputs on this IC
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Date: 30-12-2001 User comment From:
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Removing 1F unit1. Pull the 2 knobs
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16-05-1999(IC-T8) Problem with the
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800 -
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Frequencyrange after modification:5
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Offset Freq: Hold [FUNC], Press [4]
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The Icom IC W21AT handi-talkie norm
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19-07-1998(IC-W2A) IC-W2A signal le
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19-07-1998(IC-W31) IC-W31E CROSS-BA
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15-10-2000(IC-W31) Cross Band Repea
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could always try it.Set VHF and UHF
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31-07-2001(IC-W32) Icom IC-W32A pro
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IC-4GAT - Turn the radio on, hold [
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IC-M9 - Hold [HI/LO] & [DW/SCAN] bu
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IC-275H 10IC-375A 12IC-471 22IC-475
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I have tested this mod with a ic-75
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How further up the hole is the bett
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Connect the NTC, FAN and power and
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5, 31, 48, and 79.4. Does the Prior
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19-07-1998(R-7000) Modify your ICOM
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1. C231 from 1000 pf to 68 pf.2. C2
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19-07-1998(R-71) Tricking the ICOM
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There are two wires which send logi
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A. Remove the top cover of the rece
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08-11-1998(R-7100) Modify your Icom
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17-03-2002(R-7100) Icom R7100 Discr
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23-08-1998(R-8500) Operating the Ic
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Modifications for the ICOM - RogerK

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