KENWOOD TS-940 PAGE

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KENWOOD TS-940 PAGEPage 1 of 151KENWOOD TS-940 PAGEVersion 2: 4 April 2005, Version 3: 25 April 2005, Version 4: 27 May 2005, Version 5: 31May 2005, Version 6: 10 June2005: Version 7: 16 June 2005:Version 8: 25 July 2005Version 9: 30 July 2005. Version 10: 4 August 2005, Version 11: 13 Sep 2005, Version 12: 18October 2005, Version 13: 23 October 2005,Version 14: 22 March 2006, Version15: * April 2006From a passionate Kenwood TS-940 owner. The 940 has to be one of the greatest transceivers everproduced.This page is provided because: Some information here is not available anywhere else and should be useful to any TS-940 owner, Information does not exist in a single web site which is easy to follow, If the information remains available more TS-940s will be repaired and functional, (and probablyimproved),The intention is to acknowledge the person who discover the information so questions can be sent to thatperson.When information is already well documented and reliably maintained on another site then a hyperlinkis made to that site to avoid yet another slightly different version.I will publish all email feedback at the end of the page, so that whatever is discovered by others can beshared by all. Please email to jaking@es.co.nzYours sincerelyJeff King ZL4AI / DU7Disclaimer: No liability or responsibility whatsoever is taken for any of the information on this site. Youassume total liability for any modification you undertake.Copyright: Everything on this pageWhat is new in Version 15:SUMMARY OF R149 AND R150 MIS-LABELLINGWhat is new in Version 14:BATTERIES: [INTERNAL]BATTERY REPLACEMENTCW FILTERSMotor bearings gummed uphttp://homepages.ihug.co.nz/ jaking/TS-940 02.htm5/14/2006

KENWOOD TS-940 PAGEPage 2 of 151Field measurements of receiver improvement following FET swapWhat is new in Version 13:PROMOTIONAL BROCHURESERVICE MANUAL & SERIAL NUMBERSWhat is new in Version 12:PLL BOARD 4:PLL BOARDANDRF BOARDANDPLLOUT OF LOCKAVR BOARD & POWER SUPPLYFAN AND TEMPERATURESCOOL AVR COMPONENTS BY REMOUNTING ON HEAT SINKPOWER SUPPLY HEAT SINK RUNS TOO HOTVERIFY THERMISTOR 101 IS ATTACHED AND FUNCTIONINGINDEXPROMOTIONAL BROCHURERECEIVER PERFORMANCE IMPROVEMENTS.R1. KENWOOD PRODUCED 3 SERVICES BULLETINS WHICH DO CONSIDERABLY IMPROVE THE RECEIVER.RECEIVER 2. FIELD EFFECT TRANSISTORS AROUND THE WRONG WAY.RECEIVER 3. THERE IS NO AGC TIMING CORRECTIONSUMMARY OF R149 AND R150 MIS-LABELLINGMike KC8ZNW on 25/4/05 describes this same behaviour to the Kenwood.net.Executive Summary of AGC ModIndependent Feedback on how Receiver ImprovesTHE PRODUCTION MISTAKE DESCRIBED:TO CHANGE THE RESISTORSTHE INITIAL PROBLEM SYMPTOMS:ACKNOWLEDGEMENTS TO PERSONS WHO HELPED SOLVE THISA CAUTION:COMMUNICATIONS WITH KENWOOD JAPAN BELOW:RECEIVER 4. PIN DIODE IMPROVEMENTS4.1: Background on how Pin Diodes were discovered to improve radios.4.2 RadCom Technical Topics explains what Pin Diodes were supposed to achieve.Intermodulation properties of switching diodes, by Dr. Ing. Jochen Jirmann, DB1NV4.3: Summary of Key points on Purpose of Pin Diodes: [by ZL4AI]4.4 Experience from Persons who modified the TS-9404.5 : Pin Diode Modification for TS-4404.6: So summary of Pin Diode ModificationPLL BOARD PROBLEMShttp://homepages.ihug.co.nz/ jaking/TS-940 02.htm5/14/2006

KENWOOD TS-940 PAGEPLLPLLPLLPLLPLLBOARD 0:BOARD 1:BOARD 2:BOARD 3:BOARD 4:Page 3 of 151RESEAT CONNECTORSREMOVE THE BLACK FOAM FROM BEHIND THE BOARDREMOVE THE WAX FROM THE VCOSIDENTIFY WHICH PLL IS NOT LOCKEDPLL BOARD AND RF BOARD AND PLL OUT OF LOCKCONTROL BOARDVOLTAGE REGULATOR HEATS UP AND CAUSES A SHIFT IN BFO ON IF BOARDAVR BOARD & POWER SUPPLYFAN AND TEMPERATURESCOOL AVR COMPONENTS BY REMOUNTING ON HEAT SINKPOWER SUPPLY HEAT SINK RUNS TOO HOTVERIFY THERMISTOR 101 IS ATTACHED AND FUNCTIONINGREPLACE Q101 AND Q 102MOTOR BEARINGS GUMMED UP: TEMPORARY FIXRF BOARD 1: BOARD RUNS VERY HOTHOW IT WORKSAM MODE: HOW TO VERIFY ITS SWITCHED INFM MODE: SETTING FM CARRIERCW FILTERSSERVICE MANUAL & SERIAL NUMBERSIDENTIFYING WHEN RADIO MANUFACTUREDBULBSCONNECTOR PROBLEMSBATTERIES: [INTERNAL]BATTERY REPLACEMENTINFORMATION NOT ANNOUNCED BY KENWOOD:KENWOOD RELEASED INFORMATION:S METER ALIGNMENT LEVELSPARTSLINKS TO USEFUL SITESHELP WANTEDPERFORMANCE COMPARISONSMODIFICATIONSPOWER SUPPLY IMPROVEMENTSALC DELAY TIME:TS-940 AVERAGE OUTPUT POWER SSBUSE OF TS940S FSK RECEIVE FOR HF PACKETINQUIRY REGARDING USE OF ADDITIONAL RECVR.GEIL CHIPFEEDBACK FROM READERShttp://homepages.ihug.co.nz/ jaking/TS-940 02.htm5/14/2006

KENWOOD TS-940 PAGEPage 4 of 151PROMOTIONAL BROCHUREhttp://homepages.ihug.co.nz/ jaking/TS-940 02.htm5/14/2006

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KENWOOD TS-940 PAGEPage 28 of 151RECEIVER PERFORMANCE IMPROVEMENTS.R1. KENWOOD PRODUCED 3 SERVICES BULLETINS which doconsiderably improve the receiver.AGC circuit ?do DownloadFile&Document /indexKenwood.cfm?do DownloadFile&Document b6adb98b2ed832baa0aa033a297d1TS-940S Signal To Noise Ratio Improvement With Noise Blankerhttp://www.kenwood.net/indexKenwood.cfm?do DownloadFile&Document c52cce1a1412bab3177362513310TS-940S VCO/Carrier To Noise Ratio m?do DownloadFile&Document /indexKenwood.cfm?do DownloadFile&Document et/indexKenwood.cfm?do DownloadFile&Document b6adb98b2ed832baa0aa033a297d1KENWOOD TS-940S RECIPROCAL MIXING NOISEIn early March I [Rich Maher] talked to someone at International Radio regarding the reciprocal mixingnoise problem with the Kenwood TS-940S. I had been in the process of installing the fix described inyour newsletter (late 1986 issue) and found that it had already been installed on my TS-940S (S/N7100269). The factory installation had one problem, the resistors used for R120/R129 were color codedfor 900 ohm (close enough to the 1K in the newsletter), but in actuality measured 465 ohms.Apparently, Kenwood had gotten a bad batch of resistors from some supplier and had not discovered theproblem.At the time you indicated that was the first report you had received of the resistor value problem andrecommended that I contact Kenwood. I called them and was told that they had not heard of the problembefore. They also stated that a new fix for the reciprocal mixing noise problem had been developed andhttp://homepages.ihug.co.nz/ jaking/TS-940 02.htm5/14/2006

KENWOOD TS-940 PAGEPage 29 of 151was described in a Service Bulletin dated March 2, l987. I requested a copy of the bulletin and haveattached a copy of it to this letter for your information. (See Issue No. 76, Pg. 30 and 31 for KenwoodService Bulletin No. 917 and schematics pertaining to this subject.)Since receiving the bulletin from Kenwood, I have installed it on my TS-940S and found it to make avery significant improvement in weak signal handling in the presence of nearby strong signals. I wouldrecommend highly that anyone experiencing reciprocal mixing problems install the new fix. It should benoted that some of the newer TS-940S have the fix installed. I was preparing to install the fix on afriends's TS-940 which had a serial number 100 lower than my own and found that the fix had beenfactory installed. Apparently, more than one manufacturing site is used and serial numbers are given toeach in blocks. Consequently, it is possible for higher serial numbers to be produced at one locationwithout the fix, while another site any have cut in the fix but is using numbers from a lower block.The quickest way to verify whether the fix has been installed is to check R120 and R129 on the PLLUnit (X50-2020-00). If these two resistors are 3.3 ohms in value [Editor correction Service Bulleting917 says 3.3 Kilo-Ohms], the fix is already installed. Do not depend on the on the absence of C176,C180 or C181 as an indication, as earlier attempts (factory or field) to correct the mixing noise problemmay have removed these same capacitors. The instructions in the bulletin state that when making themodifications to the RF Unit (X44- 1660-00), it is easiest to move C132/C133 to the foil side of theboard. As the component side of the section of the RF Unit containing these two capacitors has beenfilled with wax, it is definitely not easier. The factory installation of the fix left C132/C133 on thecomponent side and installed the R154/C193 and R155/C194 series RC networks on the foil side. Thisis definitely easier. As a side note, the installation of the fix took me about 2 hours. Both the PLL Unitand RF Unit modifications must be completed before the transceiver is usable. If you install just thePLL Unit modifications and then try the receiver, CW signals will should like raw AC. Also, to makelife simple, do not remove each of the boards above the PLL Unit individually. The easy way to gainaccess to the PLL Unit is to remove the top two screws (one on each side) holding the front panel andloosen the bottom tow screws. This allows the front panel to be tilted forward. The speaker assemblyand all the boards above the PLL unit may then be removed as a unit by removing only 4 screws andtilting this unit towards the front of the TS-940S. No cables need be removed from the boards above thePLL Unit.I hope the above information is helpful to you in dealingwith the reciprocal mixing noise problem. (Thanks, RichMaher, WZ4Z, 1117 NW 7th St., Boynton Beach, FL 33435)REC

KENWOOD TS-940 PAGE Version 2: 4 April 2005, Version 3: 25 April 2005, Version 4: 27 May 2005, Version 5: 31May 2005, Version 6: 10 June 2005: Version 7: 16 June 2005: Version 8: 25 July 2005Version 9: 30 July 2005. Version 10: 4 August 2005, Version 11: 13 Sep 2005, Version 12: 18 October 2005, Version 13: 23 October 2005,

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