Modifications for the ICOM - RogerK

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R2 . .> D1 D2> -----------+ .. ..> | -D3-> | -D4-> IC4 | -D5-> -----------+ -D6-> -D7- . .. _ _> D8 D9 _ _> O .. .> C7> X1 |> ________________________________________________________|As far as the following two, I got the impression that the IC-229H did as well at aviation band receive as my IC-2SAT.... Onethought -- since the "CQ" review described as slightly different physical construction, I wonder if there have been some slightchanges during the production run leading to improvements in AM demod performance??This modification is read 1101 times.top of page19-07-1998(IC-229) IC-229H & 9600 bauds (Anglais)After trying to solve this the easy way with no luck, by looking for docs already posted, a few of us have decided to bug this out.A quick call to ICOM put us on the rite track. This non-destructive mod for the IC229h works well for 9600 baud packet. You willneed your schematic that came with your radio. However, our call to ICOM revealed some discrepancies on the schematic in theFM detector stage, primarily the FM detector chip itself.Earlier models had the TOKO TK10487M detector and the newer models have the MOTOROLA MC3372M. ICOM, unfortunately,did not make this change in the schematic supplied with the radio. This document will show the connection points for both chips.Remember to use good quality shielded cable like RG-174u, RG-178u or similar. Most of the points are going to require microsurgery,so get out your pencil point soldering irons and magnifying glasses.1. TXA:On the schematic you will see a block labeled "VCO UNIT". At the bottom of this there is a four pin connector. The third pinis labeled "MOD".This is where you want to inject the TXA from the modem. The "VCO UNIT" in the radio is shielded by a can. Removing this"CAN" to get to the circuits can be a tedious endeavor. So you can find this "MOD" point on the underside of the radio. It islocated beneath a flat metal shield about 1" X 2". After removing this, with the front of the radio towards you, the point canbe found in the right corner towards the front where the shield covered. There will be four solder lands rite in a row fromleft to right. Trace these lands with the schematic to find the "MOD" land. Solder your TXA there. Replace the metal shield.This is as tuff as it gets. I promise!2. RXA:Well this one is easier. If your radio has the TK10487M, solder RXA to pin 11 of this chip. If your radio has the MC3372M,solder RXA to pin 9 of this chip. Either chip can be found on a board in front of the "metal VFO shield can", on the top sideof the radio. You may have to tilt the board a little, but be careful. Don't apply too much heat to the chip or you will have abig problem. I followed the trace away from the chip and attached RXA.3. PTT:This can be found on the mike jack pin 5. I made this an internal connection for neatness. Neatness counts!4. GND:If I need to tell you where to find ground, you shouldn't be doing this mod yourself. Attach all the shields from the abovewires together outside of the radio to modem ground. Attach only one shield internal to the radio, the "CAN" is a good spot.You don't want to cause any ground loops, do you? Protect the other two shields from shorting to anything in the radio.This is why they make heat shrink tubing.You may have to add 5-10mF non-polarized capacitors in series with the TXA and RXA lines. Some modems have included thesein their circuit, so check. Now you are ready to make the connections to the modem. This will have to be left up to you. Thereare too many modems and tnc's out there to list all of the connections to them. But you should have the docs with your modem,so it should be easy. Disconnect the radio from the modem if you use the radio for anything else. Well there you have it. Thisworks great, it is what I am presently using.This modification is read 859 times.top of page
19-07-1998(IC-229) IC-229H Fix CPU/Display boardHello From Mike, N3KCT !For those owners that have encountered CPU RFI from your IC-229, Here's the fix!The problem is cured by properly grounding the CPU/Display board.First remove the top and bottom covers. Then carefully remove the threaded mic connector which fastens the mic jack to thefront panel.Remove All Knobs and then the four screws that hold the front panel onto the metal chassis. This exposes the clear displayhousing and CPU board when you slide the front panel off.There will be three screws that hold the display panel along with the CPU board onto the main chassis. Two are next to the micconnector, and one is next to the channel control knob. Remove these three screws and the entire display/CPU section will comeoff in one piece. You will not have to disconnect any of the wiring.Carefully clean the ground traces that these screws go through on the back of the CPU board and tin them. They are aroundeach screw hole on the CPU board. When the radio is re-assembled, these traces will now properly ground out the CPU sectionand cure your RFI problem.Appearantly something happened during manufacture that caused these to be covered with that "clearcoat" stuff to preventthem from grounding out.This fix has been 100% effective on mine and several other radios.The problem is NOT in the mic, it is just poor grounding of the CPU!Any questions or comments can be sent to:N3KCT@NR3U.#NCPA.PA.USA.NA73 de Mike !!P.S.I do not assume any responsibility for this mod, so procede only at your own risk and capability.This modification is read 917 times.top of page19-01-2002(IC-2320) Extended RX/TXAuthor: Marcelo - ZZ2MWL - yoda2@zipmail.com.br.MODIFICATION.NETHello radio partner's,Here I expose what got working in the IC2320.1. Open the radio and remove the front2. In her meets the logical plate and it is in her that we will work3. Remove the diodes marked as D9 and soon below him you will see 3 small diodes, remove only the diode of center markedwith "x", doesn't remove other diodes, because in spite of him to be very similar at the IC229 doesn't forget that this isDUALWith this you will have an opening of:RX: 118-174 VHFTX: 140-150 VHFRX: 300-399 UHFRX: 430-440 UHFTX: 430-440 UHFRX: 800-950 UHFIs not necessary reset the radio!!!
Page 1 and 2: Modifications for the ICOMcreated 2
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Page 11 and 12: 2. After about 0.5 second, press st
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Page 21 and 22: 6. Reinstall the RAM board into the
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Page 27 and 28: ●Connect the short plug end with
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Page 31 and 32: 50MHz to something like 204MHz cont
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Page 37 and 38: Fig. 3: The circuit extract from IC
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Page 43: More detailed:In the true spirit of
Page 47 and 48: In addition, if you want to put an
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Page 67 and 68: other wires come in. Take the cable
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Page 87 and 88: not a hard mod to do,..........but
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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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This modification is read 748 times
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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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●●●●●●●●●●●
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From: gary@ke4zv.atl.ga.us (Gary Co
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Mehr Dynamik in der Modulation beko
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Operation:Be sure to read the manua
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Alternative zum modifizierten PC St
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●●●●●(Another receiver wi
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| IC31 uPD4094BG || |1 2 3 4 |5 6 7
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D116 and D118 are responsible for o
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Transmit power output after modific
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This information and photos was sup
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22-02-2002(IC-706MKII) IC-706MKIIG
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This modification is read 2320 time
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Delete cap. CT14 at pin 6 of IC3 on
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18-06-2000(IC-729) Using two Icom r
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19-07-1998(IC-735) IC-735 Remote Wo
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19-07-1998(IC-736) Icom IC-736 DDS/
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Also probably would apply to IC 735
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RAM card version B images:This modi
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John Schmitz NS8EAdditional informa
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13-01-2002(IC-746) Monitor Audio Ou
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19-07-1998(IC-751) IC-751 Bad Cap P
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inspect your job to be sure that th
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28-01-2002(IC-751) ICOM IC-751 Dual
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Step 8: Turn the radio off and inst
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To be neater you could remove the s
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[W804] | |Remove=>[W805] | CHIP |[W
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Date: 23-02-2002 User comment From:
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less.The second way to adjust the I
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23-11-2001(IC-756pro2) IC-756PRO2 T
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19-07-1998(IC-765) Icom IC-765 Pass
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19-07-1998(IC-775) New product info
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70% AM.My personal findings are tha
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11. Re-install board and all cables
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The Yaesu FT726R first appeared ten
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There seemed to be no way of changi
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Add a diode on the blank position b
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---- gar keine Diode ----Breitband
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To disable the x-band repeater just
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Well this should make things verry
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Set radio in VFO mode, and select f
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27-05-2001(IC-910) Expanded functio
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●●●350-470 MHz RX/TX800-950 M
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1. You're completely successful.2.
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●●●●●●●●●Für Han
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28-03-1999(IC-Q7) Modifying the ICO
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●●●●●●●●Desoldering
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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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