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Kenwood TS 690S


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Comments to date: 1. Page 1 of 1. Average Rating:
jooo 1:38am on Saturday, September 4th, 2010 
Great product especially at the price In a nut shell amazing what you get for your money.

Comments posted on are solely the views and opinions of the people posting them and do not necessarily reflect the views or opinions of us.




(TM-733) (TM-733) (TM-733) (TM-733) (TM-741) (TM-741) (TM-741) (TM-741) (TM-741) (TM-741) (TM-741) (TM-741) (TM-741) (TM-741) (TM-741) (TM-741) (TM-741) (TM-741) (TM-741) (TM-742) (TM-742) (TM-742) (TM-742) (TM-742) (TM-742) (TM-742) (TM-742) (TM-742) (TM-742) (TM-742) (TM-941) (TM-942) (TM-942) (TM-942) (TM-942) (TM-942) (TM-942)
External DTMF Remote Control English language TM-733 data pinouts descriptions English language TM-733A PL tone bleed through English language TM-733 quick operation guide English language Umbau des TRX Kenwood TM-741 E fuer 9600bd German language TM-741ATE Frequency enion English language TM-741a/e AM recleppion with 28 and 50 mhz unit English language TM-741 A/E 900 MHz band receptton with 430 MHz unit English language TM-741A/E memory channel doubling English language TM-741A/E extended paging functions English language TM-741/E DTE DISPLAY Format English language TM-741A/E DC ERDISPLAY English language TM 741A/E headlight linkage dimmer English language TM 741A/E game mode English language Kenwood TM-741a GAME Dox English language Display test English language Hearing birdies in the 440 MHz position English language TM-741A/E repeater modification (transponder functions) English language TM-741a All-Band mod for new Kenwood Tri-Bander English language Microprocessor Change, TM642/742/942 English language Modification of TM-742 & 942 English language Extended frequency for TM-742E English language Fan Delay time setting English language Wireless remote control with DTMF handheld transceiver English language CHANGE YOUR TM-742E TO A TM-942E (who don't exist on the market) English language TM-742/942 Beyond Mars/CAP Mod. Guide English language TM-742/MHz/50 MHz RC TX failure English language TM-742/942A Microprocessor change English language TM-642/742/942A Microprocessor change English language TM-742 Control Unit X53-346X-XX **B/2** TX Mod English language Kenwood TM-941A undocumented feature English language Microprocessor Change, TM642/742/942 English language Modification of TM-742 & 942 English language TM-742/942 Beyond Mars/CAP Mod. Guide English language TM-742/MHz/50 MHz RC TX failure English language TM-742/942A Microprocessor change English language TM-642/742/942A Microprocessor change English language

This modification is read 366 times.
(MC-46) MC-46 DTMF Mic. With older equipment
The MC-46 DTMF (Dual Tone Multi Frequency, or Touchtone (TM)) microphone may be adapted for operation with any VHF or UHF radio by changing the supplied six pin mic connector to a five pin, four pin, or other connector, as required. Radios not originally supplied with regulated, filtered B+ at the mic connector need also to be modified to power the microphone. The MC-46 standard six pin mic connector is part no E07-0651-05, and is wired:
Pin White Red Blue Green Brown Shield Mic Output PTT Down Up B+ (8.5 VDC +/- 10%)
The Four pin connector part no is E07-0403-05. Radios built with a four pin jack do not supply B+ to operate the mic, and must be modified to deliver a constant source of DC to operate the mic and DTMF keyboard. Any Kenwood product of this vintage will have a B+ line designated "C9" (Common 9V DC), wich is regulated, filtered, and noise-free. Rewire the mic as described below:
Pin White Red Shield Brown Mic Output PTT Common Ground C9
Rewire the radio mic jack: pin 3 to common ground, pin 4 to C9. Rewire the stock mic for pin 3 common ground. Otherwise, the mic element will be returned to C9, instead of ground. Note this change on the radio schematic. The Five pin connector part no. is E07--551-05. Radios built with a 5 pin jack supply correct B+ for a DTMF mic (originally designated MC-45, and no longer available). Wire the mic as described below:
Pin 1 White 2 Red 3 Brown 4,5 Shield Mic Output PTT B+ Common Ground
Mating chassis connectors are:
Four Pin Five Pin Six Pin E06-0403-05 E06-0552-05 E06-651-05
This modification is read 309 times.


(MC-48) MC-48B Mic element change
Author: Kenwood Communication, inc. Service Bulletin no. 983 (6-2-1991) The original microphone element has been replaced. The new element has two connections and is much smaller than the original three connection element. When installing the new element, connect the wires as shown below. A 33 Kohm, watt resistor must be placed in series with the yellow wire. The rubber spacer is placed in front of the element when the microphone is assembled. The metal spacer can be discarded. Mic element part # T97-1024-08
This modification is read 329 times.
(MC-50) VOX-3 Sensitivity and Delay
Author: Trio-Kenwood Communication, inc. Service bulletin no. 15 (26-5-1977) There have been a few instances of improper VOX operation when the MC-50 microphone is used. The sensitivity of the VOX-3 may be increased by removing R-4 and connecting R-3 directly to ground. Also install a 220mfd 25Vdc electrolytic in parallel with C-6. (These parts are all on the X54-1010-00 board.) If the VOX delay is insufficient, change C-10 (on the X54-0001-00 board) from 3.3mfd 50Vdc to a 10mfd 50Vdc capacitor. Shown below is a modified schematic showing these changes.

(TH-48) TH-28/48/78 Difficult battery insertion
This modification is read 685 times.
(TH-48) TH-28/48A/E CTCSS tone error
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(TH-48) TH-48A Microprocessor change
Author: Kenwood Communication, inc. Service Bulletin no. 1039 (10 February 1994) Symptom: Due to a recent rule change by the FCC it is no longer possible to supply transceivers, or provide replacement microprocessor that would allow a transceiver to receive in the 800 MHz band. Corrective action: The microprocessor program of IC5 has been modified to prevent 800 MHz band reception. Production has been changed beginning with serial number lot 510xxxx. Units produced after this point will not be capable of 800 MHz reception. Parts required:
Qty 1 Description Microprocessor Old part No. HD404629A79H New Part No HD404629B44H
Procedure: When ordering a replacement microprocessor you will be supplied with the new version. Please make sure your customer understands the limitations of this new
This modification is read 683 times.
(TH-75) TX across entire tuning range TH-75A
I have a couple of mods that you may or may not have. For the TH-75A MARS/CAP mod, removing D4 will allow TX across entire tuning range, except that actual TX range will be limited by tuning of the PLL. For the TM-731A, there is a "Beyond MARS/CAP transmit Modification". It provides TX from 136 to 174 and 400 to 500 MHz. Again, actual TX range limited by PLL tuning. If you don't already have this and would like it, I'll send a copy if you furnish me your address. It involves cutting R25 on the control unit, and installing a jumper (diagram required to locate position), then two resets in a row. I have tested these mods on my own rigs. 73 - Kevin, KD2SL @ KC3BQ
This modification is read 740 times.
(TH-75) 9600 baud with the TH 75
I tested the follwing modification only for the 430 MHz part. Perhaps it works also on 2 meters if you try the modification on the 144 MHz IF-Unit. For opening the TH 75 follow the instructions of the manual page 31 ( installation of the TSU-Unit ). After opening the handy, it is not necessary to disconnect any connectors between the front and rear part. All connections have to done at the rear part. -TXOn the right side of the open handy is a connector (No. 201). The wires of this connector are leading to the lower board of the rear Part. Disconnect this connector. Next remove the five screws holding the upper board. Now it is possible to lift this board for about 5 mm. On the lower side of the board are the solder pins of the connector which was opened before. Solder a thin wire to pin No 5. (Start counting at the antenna side of the TH 75). This wire can be connected direct to the TX-Exit of your TNC, if this exit has A/C level only. If the TNC has also D/C level add a capacitor of about 4.5 to 6.8 uF. -RXA little bit higher to the connector were the TX line was connected is the UHF - IF unit (X58-3610-00). It is a small additional board over the main board. You will find the IC TK10485M on this small board. Solder a wire to pin No 11, the first one the left side (Start counting again at the antenna Side). This pin is connected to a capacitor. In order to prevent the IC from being demaged, I recomment to do the soldering at this capacitor. This wire can be connected direct to the TNC. If you need for some reason the squelch of the TH 75 during 9K6 operation, add a resistor of 10 KOhms in the RX line. These are all modifications necessary for 9K6, and now you can start closing the TH 75. If you do not instaubber cap of the DC IN Terminal, you have a fine little gap for the wires. But it is also possible to install an additional jack if the TSU-6 unit is not installed. The ground connection can be made via the speaker jack. The PTT line of the TNC should be connected to the MIC jack. The TH 75 is able to work with a TX-Delay of 150 - 170 ms (> T15) which is a good value for a modified PLL TRX.

11. 12. 13. 14. 15.

Mail to Robert Veal on FORTH VIEW BBS (6680) E-Mail to Mobile telephone - Voda GM7AVE @ GB7EDN (MRSGB) Stingray Systems(1996)
This modification is read 938 times.
(TM-2530) TM-2530/2550/2570 MARS/CAP
The TM-2500 series radios may be easily modified for use on MARS/CAP frequencies from 141-150.995 MHz. Locate the control unit (X54-1860-XX) on the bottom of the radio. This is the same board that the TU-7, and or MU-1 are mounted on. Just to the left of IC3 you will find a row of diodes. Cut diodes D8, and D11. After the diodes have been cut you will have to "reset" the microprocessor. Microprocessor Reset. 1. Press and hold the [PS] key. 2. Turn ON the power switch. 3. Release the [PS] key. All of your programmed data such as memory channel data, DCL data, and Phone number data will be erased and you will have to reprogram them. If the radio is not reset, it will not recognize that you have cut the two diodes.
This modification is read 257 times.
(TM-255) Solution 9k6 TM255/455
Dear OM's This is what I found a service technical report from Kenwood acc. TM255 and TM455 9600bps Date November 8, 1994 SUBJECT: Countermessure against modulation during packet 9600bps operation. Phenomenon: A trouble modulation malfunction during packet 9600bps operation was found in the manufacturing process even trough there in input in the DATA terminal. Pay heed to this trouble in replacing the analog switch IC13. Cause: This trouble is cuased by variation in the analog switch IC13. Even if the 9600bps SW Tr.(Q20:DTA124EK) has been turned ON, the analog switch IC remains unstable. Counter messure: We decided to raise the analog switch IC13 voltage while the 9600bps SW TR. (Q20:DTA124EK) is in action by changing the chip resistor R117 in the TX-RX-unit of TM455A/E and of TM255A/E..etc. R117=10K to be replaced with 3K3 So if you have problems with those two say to your dealer to ask for SERVICE TECHNICAL REPORT No. B510-94-081E page 1/2 and page 2/2 73's DE PAT KE6MIQ
This modification is read 1025 times.


(TM-255) Mods for the Kenwood TM-255E
Adjust LOW power setting The way to adjust low power is to regulate VR401. This trimmer can be found under the speaker (regulates power between 2 and 30 watts). Adjust HI power setting To regulate the power of the HI position is to adjust VR601. You can find this trimmer on the back left side (remove top and locate the alu cover). Please be carefully when you dismount and locate the trimmer. Adjust TX-Power/SWR ratio At the same place you can find VR603 and that is the SWR protection control. Be carefull when adjusting this trimmer, because it protects your transceiver against bad SWR, but can be usefull when power drops to much on relative good SWR. Adjust AGC To adjust the AGC time constant of the transceiver locate VR402 that can be found on the left side at the center when removing the top. Note: Please be carefully with these adjustments! All modifications you make is totaly at your own risk. If you have any other mods for this good transceiver then please contact me. 73's De Guy ON1DHT @ ON0BWP.#BTN.BEL.EU QTH: Aalst, Belgium, JO20AW E-mail: Website:

12 Kohm 1/10 watt chip resistor 18 Kohm 1/10 watt chip resistor RK73FB2A123J RK73FB2A183J
1. Disconnect the power supply and antenna from the transceiver. 2. Remove the top and bottom covers (12 screws). Do not damage the speaker wires when removing the top cover. 3. Unplug all connectors from the TX-RX (VHF) unit on the bottom of the transceiver. Remove the 7 screws from the board and then pull the board from the transceiver. 4. Unplug all connectors from the TX-RX (UHF) unit on the bottom of the transceiver. Remove the 6 screws from the board and then pull the board from the transceiver. 5. Remove the silver colored screws from the front panel chassis (2 on each side, 1 on top, and 1 on the bottom). 6. Pull the front panel assembly away from the body of the transceiver (do not disconnect any cables). 7. Remove the 6 screws from the Control unit (A/3) which is mounted on the body of the transceiver. 8. Pull the board away from the transceiver, but do not disconnect the red and black wires. Keep track of the two short coax cables that run under the Control unit. The cables connect between both TX-RX units. 9. On the component side of the Control board (the side with the majority of connectors) replace R7 with an 18 Kohm chip resistor (figure 1). 10. Assemble the front panel by reversing step 5 - 8. Do not forget to run the two short coax cables (mentioned in step 8) under the Control unit. 11. On the foil side of the TX-RX (UHF) unit, remove chip resistors R37 and R41 (Figure 2). 12. On the foil side of the TX-RX (VHF) unit, replace R43 with a 12 Kohm chip resistor (figure 3). 13. Assemble the transceiver by reversing step 1 - 4.
This modification may not be covered under warranty. Time required for this modification is 1.5 hour or less.
(TM-731) TM-731 frequency and cross band repeater
The TM-731a will transcive between 136-174 MHz and 400-500 MHz as well as perform cross band repeter function when the following modifications are performed. 1. 2. 3. 4. 5. Remove both the top and bottom cover. Disassemble the front panel such that the control unit (X53-3250-XX) is accessable. Remove R121, R123 and R25. While R125 snd R124 must be present. If the time-out timer function is not desired, remouve R122 as well. Reassemble the unit and perform a microprocessor reset before operating the set. Preserve your license by operating whithin the bands it is cover for.
This modification is read 1097 times.
(TM-731) TM731 & 9600 Bps
The TM731 is different enought to cause problems. What need to be done is to add another RX Mute transistor. (look the schematics and see how the TX deviation is shorted to ground during receive.) Use a plain NPN and a pair of 10k resistor (copy the one used on VR3 in the schematics.) Take the TX DATA and feed it to the collector through a series 1k resistor, and then feed that through another 1k resistor to the wiper on the deviator pot. This was a result of Kenwood changing the deviation pot value from 10k to 100k (it's wasn't broken, but they fixed it anyway.) It is full of surface mount devices. Article of Jeff WA6FWI @ WB6YMH.#SOCA.CA From: CQ USA - June/92

TX-RX Unit (X57-4360-00) Foil Side View --------------------------------------------------------------R 7 (IC403 on component side) R 8 R 6 R 4 R542 R543 R545
_______ -| |-| |-| |-| IC402 |-| |-

-| |-|_______|-

Caution: This modification requires advanced surface mount soldering equipment that is rated for CMOS circuits. It also requires familiarity with advanced surface mount soldering techniques. If you do not have the proper equipment or knowledge do not attempt this modification yourself. Seek qualified assistance from your closest Kenwood Service Center (Long Beach, CA, or Virginia Beach, VA).
Extra note, these nots is not from Kenwood.
The Service Manual specifies a test for the PL. The technician is simply required to verify that any one PL tone is between 500 and 1500 Hz deviation. This is quite a wide tolerance range! The "standard" PL tone deviation should be 750 Hz. Twice that strong might be too strong and become audible. There are no trim-pots on the PL deviation, so I'm guessing that the deviation is pretty constant from radio to radio. The dirty PL is definitely found on early models, but we have had many reports that the PL problem has been fixed in newer versions of the radio. If you purchased your radio after September 15, 1994, (or your serial number is greater than 55000000) it's a good chance that you may not have the PL problem. The other problem concerns the DTMF Confirmation Tones. This feature is off by default (I wonder why :), while it seems pretty useful. To turn it on, press [PTT] + [Down] on the microphone while powering the radio on. This will generate short DTMF confirmation tones whenever you send DTMF over the air from the keypad. Unfortunately, it mangles the beginning of the outgoing DTMF tone! This is serious enough that most local repeaters can't detect the tone, or count it as two tones. Get a receiver and listen to what you are sending out when the Confirmation tones are enabled. It sounds to me like they may be mixing the confirmation tone in with the real tone and getting some destructive interference. Just a guess, though. I called a Kenwood technician (Ricardo) and worked with him on the phone to reproduce the problem there. So, as of today, this is a Known Problem, and they are looking into a fix. :-) I am really curious to know what they would say if other folks called up and complained about this problem. Would they deny hearing about it, or would it really be a Known Problem? Might give some insight into the PL-noise denial thing anyway. :-) Personally, I'm much more concerned about the noisy PL than the DTMF confirmation tones, since I can just shut those off and pretend that feature doesn't exist. If enough people call about the PL problem, maybe they will come out with a real fix and offer it under warranty to all the radios out there (since they're all pretty new). My guess is that it will involve a free TSU-8 tone decode module, but don't hold your breath. :-)

(TR-2400) TR-2400 TX noise
Author: Trio-Kenwood Communication, inc. Service Bulletin no. 830 (31-7-1980) Some units may exhibit excessive background noise (up to several hundred Hertz deviation). This may be reduced or eliminated by installing an additional shield between the Display and PLL units. This changes applies only to units between serial numbers 011xxxx and 101xxxx. Radios before this group (with a momentary REV switch) will not show improvement by addition of this shield. Refer to Service Bulletin #815 for this early group. Units appearing with serial numbers after 101xxxx will have this shield factory installed. Parts supplied:
N09-0627-05 F10-1627-05 Pan head screw Shield w/lead 3 pcs. 1 pcs.
Remove 4 rear case screws, and 2 screws from inside the battery compartment. Spperate front case body. DON'T tear leads. Remove 2 small and three large screws from the bottom edge of the Display unit. Save the two small screws. Installing the three pan head screws in place of the round head screws. Install the shield foam towards the Display. Lift the protective plastic only enough to secure the shield with the two small screws. Cover the screw heads with the plastic film. 6. Secure the shield ground under the small Philips screw located between the BUSY/OPEN and S TONE switches. 7. When reassembling, the wiring harness must be positioned to the right of crystal X2 (44.1666MHz) or the case will not close correctly, and wires will be pinched. 8. Close the case and reinstall 6 screws.
Installation time for this shield is approximately hour.
This modification is read 452 times.
(TR-2500) TR-2500/3500 dip switch setting
The following is a list of the Dip Switch settings for the Kenwood TR-2500/3500. It is mainly intended for those who have the radio but lack the info.
1=ON 0=OFF FREQUENCY --------67.0 71.9 74.4 77.0 SWITCHES !1-2-3-4-5-6 ----------0 0
79.7 82.5 85.4 88.5 91.5 94.8 100.0 103.5 107.2 110.9 114.8 118.8 123.0 127.3 131.8 136.5 141.3 146.2 151.4 156.7 162.2 167.9 173.8 179.9 186.2 192.8 203.5 210.7 218.1 225.7 233.6 241.8 250.3
73s from Alan N6QOG @ K6RAU.#NOCAL.CA.USA.NA.
This modification is read 640 times.
(TR-2500) TR-2500 RX IMD Improvement
Author: Trio-Kenwood Communication, inc. Service Bulletin no. 858 (24-5-1982) RX intermodulation distortion may be improved by reducing second conversion oscillator harmonic content and level. No adjustments are required. This may be applied to a unit specifically exhibiting out-of-band intermodulation distortion. It is, however, not a general improvement. On the TX RX unit X44-1460-xx, perform the following changes:

This modification is read 485 times.
(TR-7625) Correcting Frequency Difference Between RM-76 and TR-7600/TR-7625
(TR-7625) TR-7600/7625 Audio tone on TX
This modification is read 480 times.
(TR-7625) TR-7600/7625 Optional ceramic filter
This modification is read 468 times.
(TR-7625) TR-7600, TR-7625 Battery Memory Backup
(TR-7625) TR-7625 Final module replacement
Author: Trio-Kenwood Communication, inc. Service Bulletin no. 820 When replacing the output hybrid with a "red dot" unit, an additional 47pF cap must be installed between the M57712H output terminal and the RFO warp post. Install the M57712H with white silicone heat sink compound. Install a 47pF as shown between the hybrid output and the RFO terminal. Spread L21 as necessary for at least 30W output at approximately 5.5A total current consumption. Note: Hybrids not having a red Mitsubishi logo do not require the additional cap or adjustment.
(TR-7625) TR-7625 Hybrid amplifier module substitution
Author: Trio-Kenwood Communication, inc. Service Bulletin no. 826 (30-5-1980) (Supercedes #820) Final modules obtained from Trio-Kenwood Communications Parts Department after 1/5-1980 MUST be installed as outlined. Two versions of the hybrid may be supplied, either marked as an M57712H, or as an M57733. This information applies in either case. Installations: 1. Remove and delete C49, 22pF 2. Add a ground lug adjacent to the RFI terminal. 3. Add 10pF across the RFI terminal and ground. Adjustment: 1. Adjust TC2 for maximum output at 146MHz2. Adjust VR4 for 5W output at 146MHZ, low power.

New part: 10pF C45CH1000

(TR-7730) TR-7730 Transmitter Freq Response, Voice or DTMF
Author: Trio-Kenwood Communication, inc. Service Bulletin no. 854 (25-1-1982) Operator complaints of insufficient lows in transmit, or faulty Autopatch operation traceable to incorrect twist (high to low tone group balance) may be remedied by changing two capacitors at the mic amplifier input. On the RX/TX unit X44-1450-61, change C78 and C81 from 0.1uf to 1.0uf, 35v tantalum (CS15E1V010M) to increase low frequency transmitter frequency response. Adjust Deviation (VR3) or mic gain (VR2) as necessary. Installation time for this procedure is 1/2 or less.
This modification is read 304 times.
(TR-7800) TR-7800 Loss of Memory

This modification is read 2070 times.
(TS-440) Connection of the KENWOOD TS440S to a DATA
Connection of the KENWOOD TS440S to a DATA terminal such as a Kantronics KAM using the rear ACCpin jack.
____ 4 GROUND ___ | |____ 8 | |___ 12 / MIC ____________/


| 13 | | | | | \_/ \_/ ===== ===== | | |___________________| | | | | PTT
Pins | Application ----------------------------------------------------------------3 Data output - not used as the level is very low the prefered connection is via the speaker output this also allows fine adjustment of level to enable best decoding. (A switch on the speaker to 'mute' it when required is a good idea.) Ground - you may have to experiment with these connections to eliminate RF feedback and noise. Here they are all strapped. Mic mute - prevents audio pickup from the mic when earthed. By connecting to the PTT line as shown through a diode automatically MUTES the mic when using data. When the front panel PTT or MIC PTT are used the microphone is 'live'. Standby - PTT which when taken to ground puts the set 'on air'. By connecting through a diode as shown doesn't affect the PTT operation but allows auto mic muting.
The diodes used can be virtually anything, here they are IN4148. The INPUT audio to pin 11 must be quite a high level. If using a KAM you are certainly going to have to change the HF LEVEL JUMPER in the KAM. The level of the KAM as shipped suites connection to the FRONT PANEL MIC but not the rear connector, you can however correct this with the jumper. People using the PK232 have complained of NO TX AUDIO, I suspect the level is so low that only local minitoring will show a level present.
This modification is read 2076 times.
(TS-440) Kenwood Computer Interface Instructions
These Instructions are TS-440 specific, but the basics also apply to the TS-940, TS-811 and TS-711. It is possible to save yourself a few dollars and lose nothing in quality by buying the parts to upgrade your Kenwood radio for computer control. Just purchase the parts were you find them and install them using the instructions in the Radio's Manual.

HRS",edition of 9A union. On my TS-50S I tried the work with 2 computers: laptop worked with CAT-control, while PC 386 worked with SSTV (Hi )! The work was stable. I wish to all CAT enthusiasts a lot of pleasure. Vy 73 de ! Connection "home made" cable to IF-10D to PC:

PC-DB9 _____________

IF-10D _________
DIN6P. 1. o GND------------------------------------------------o 5.(GND) 2. o TXD------------------------------------------------o 2.(RXD) 3. o RXD---------------------------I>I------------------o 3.(TXD) |--I I--| 4. o CTS-----------------------------------I>I----------o 7.(RTS) |---I I---| 5. o RTS------------------------------------------------o 8.(CTS) 6. N.C. -I>I- germanium dioda -in ser! --I I---paralel diods kond 10nF de Iko-73!
This modification is read 2258 times.


(TS-50) Important note to 0-30 MHz TRX mods
If you want to make your TS50 tranceiving 0-30 and find more then 1 diode in your radio, PLZ watch out! Dnt remove diode nr1! Remove nr5. If you remove diode nr1 your radio is history!
This modification is read 2722 times.


(TS-50) New version. General TX for TS-50
The new version of the TS 50 has three non surface mount diodes to be cut for general TX.
This modification is read 2576 times.
(TS-50) TS-50S Lithium battery replacement notes
Author: Kenwood Communication, inc. Service Bulletin no. 1015 (10 May 1993) Procedure: Immediately after replacing the Lithium battery you must cycle the radio ON then OFF. Failure to follow this procedure will result in premature failure of the battery. If the power is not cycled ON then OFF the microprocessor will immediately begin drawing approximately 1 mA of power from the Lithium battery, resulting in poor battery life. When the battery is replaced we recommend the insulation sheet also be changed. Part numbers for the battery and insulation sheet follow. Parts required:
Qty Description Lithium battery Insulating sheet Kenwood Part No. W09-0515-05 F20-0521-04 Circuit description BA1 --
Caution: This modification requires soldering equipment rated for CMOS type circuits. It also requires familiarity with surface mount soldering techniques. If you do not have the proper equipment or knowledge do not attempt this modification yourself. Seek qualified
assistance. Time required for this modification is 15 minutes or less.
This modification is read 2071 times.
(TS-50) TS-50S "Hello" displayed during TX

8. The 4-40 small pattern nut just fits between the heat sink fins. Use a thin tool that can hold the nut on the end, and orient the flats of the nut to go between the fins. It's helpful if the parts are magnetic, so you can recover a dropped nut (be sure to cover the holes in the chassis with tissue or a rag). Use a 4-40x3/8" screw to fasten the regulators to the heat sink. The same nuts and screws are used in DB9 and DB25 connector shells. I use some heat sink compound on the back of the regulators. No insulation is required. Check again to be sure the screw for the TO220 pass transistor is tight and the transistor is oriented up so you can get to the terminals. 9. Reconnect the lugs to the backs of the TO3 pass transistors, holding the nuts with log-nose pliers and using a drop of retaining glue or Loctite. Reattach the diode quad to the heat sink. 10. Attach the heat sink to the radio with the middle black screws. Check that there are no wires being pinched between the heat sink and the chassis. Now you can hook up the regulator wires to the terminal strips in the fan case. 11. The resistors to be replaced are inside the power supply fan case. You will notice that the resistors will have lost their color coding from overheating, and the terminal strips may be somewhat charred, from overheating. Cut out the two 82? resistors and their zener diode, and cut out the 22? resistor and its two zener diodes. You can save these in case of trouble, but the new circuit should be more reliable.
The fan case should now look like this:
Cut to length and solder the Yellow, Black, Gray and White wires to the terminal strips, making sure they are connected to the same color wire that is already there. Dress the wires in place to avoid the fan with a tiny nonmetallic cable tie or twister. 12. Plug in the radio, being careful of high voltages at the power switch and transformer. Connect a digital voltmeter to radio chassis ground and check the voltages at the terminals in the fan case. Turn the radio power on momentarily to check each of the voltages:
Orange Yellow White Gray +28.5 +21.7 +15 +8
13. Unplug the radio. If you wish, you can replace the 100ohm resistor with a 5W unit, and the 33ohm resistor with a 3W unit. Using a piece of wire or an oiler, place a drop of oil on the fan shaft. Check to be sure the fan wires aren't broken, and reattach the fan case with the four black screws. Plug the fan back into the power supply board. Replace the top cover and test the radio.

This modification is read 1272 times.
(TS-940) TS-940 Mod for MARS and all band operations
Locate IC number 109. Now find diode 130 and cut it for all-band transmit. If you want just MARS coverage, locate IC 111 and 112, and snip diode 135 beside it.
This modification is read 1815 times.
(TS-940) TS-940S PLL unlock
Author: Trio-Kenwood Communication, inc. Service Bulletin no. 900 (18-10-1985) Some users of the TS-940S have reported a blanking of the display accompanied by a loss of transmit and receive. Readjustment of the PLL unit will correct this tendency. Procedure: 1. Set the Dial frequency for approximately 1.8 MHz (inside the band). 2. Using an RF probe at TP5 adjust L22, L23, and L24 for a maximum reading on the meter. You should see approximately 250 mV. 3. Adjustment of L24 will produce the greatest change, which may be up to a 90 adjustment from its present position.
Time required for the procedure is.5 hour or less.
This modification is read 1430 times.
(TS-940) TS-940S Antenna Tuner Relays
Author: Trio-Kenwood Communication, inc. Service Bulletin no. 907 (4-4-1986) Occasionally during operation of the AT-940 a VSWR greater than 1.5 to 1 might cause overloading of the relay contacts in the antenna tuner. This may be especially noticeable when switching BANDS, or if TUNINS is performed too frequently. The following procedure should reduce or eliminate the tendency. Parts Required Q69: Digital transistor, (DTC124ES) R304: 5,6 Kohm 1/6 Watt Resistor, (RD14BB2C562J) Procedure: 1. Add the circuit as shown below. 2. After the circuit has been installed adjust VR4 for a 10-15 watt output when the antenna tuner operates.
Time required for the modification is 1 hour or less.
This modification is read 1381 times.
Author: Trio-Kenwood Communication, inc. Service Bulletin no. 908 (8-4-1986) Reports of a PLL unlock on the lower frequencies may be due to low VCO levels. The following change will increase the VCO level and should prevent reoccurrence of this symptom. Parts required C168, change to 15 pF 50V (CC45SLIH150J) Procedure: 1. On the RF unit (X44-1660-00) change C168 from a 33 pF capacitor to a 15 pF 50V capacitor. 2. Readjust the VCO BPF (RF unit L74-76) according to the instructions contained in the TS-940 Service manual.
This change is applicable to units prior to serial number 606xxxx. Time required for this modification is 1 hour or less.
(TS-940) TS-940S AVR unit capacitor change
Author: Trio-Kenwood Communication, inc. Service Bulletin no. 909 (8-4-1986) In those areas of the country that are subject to large power line voltage fluctuations, excessive voltage may be applied to capacitor C12 on the AVR unit (X43-1500-00). These voltage fluctuations might exceed the capacitor breakdown voltage. Replacing capacitor C12 with a capacitor having a higher breakdown voltage will help prevent this potential problem. Procedure: On the AVR unit (X43-1500-00) change C12 from a 6800 F capacitor to a 5600 F 25 V capacitor (C90-2037-05)

RF UNIT (X44-1660-00)

R154, 155 C193, 194 3.9 Kohm 1/6 watt carbon resistor 1 F 25V Tantalum capacitor RD14CB2C392J CS15E1E010M
Procedure: On the PLL unit (X50-2020-00) remove capacitor C176, C180, and C181. Change resistor R120 and R129 from 470 ohms to 3.3 Kohm. Change resistor R121 and R124 from 1 Kohm to 680 ohms. Change capacitors C184 and C185 from.22 F to.33 F 35V tantalum capacitors. Install C180 and C181 in the positions shown in the accompanying diagrams. The use of new capacitors is recommended to improve reliability, don't try to reuse the old capacitors! Capacitors C181 and C180 should be attached to the foil side of the PLL unit. On the RF unit (X44-1660-00) install the series RC circuit composed of R154 and C193, and R155 and C194, as shown in the accompanying diagrams. As the diagrams illustrate it is easiest to move C132 and C193 to the foil side of the board and install the series RC circuit on the component side. This is an optional change and may not be performed under warranty. Time required for this modification is 1.5 hour or less.


This modification is read 1265 times.
(TS-940) TS-940S Squelch switching noise
Author: Trio-Kenwood Communication, inc. Service Bulletin no. 918 (21-7-1987) In some TS-940S below S/N 711xxxx, a "popping" or "clicking" noise may be heard when the squelch circuit is opened or closed. This may be more noticeable when an optional CW filter is installed. The following procedure will minimize the noise. Parts required:
R194 R197 R355, 356 CKohm 1/6 watt 220 ohm 1/6 watt 220 Kohm 1/6 watt 0.47 F, 50V electrolytic RD14CB2C564J RD14CB2C221J RD14CB2C224J C90-0484-05
Procedure: 1. Disconnect the power cord and antenna from the transceiver. 2. Remove the top and bottom covers (16 screws). 3. Locate the I.F. board on the bottom of the transceiver. 4. Remove the 7 screws from the I.F. board. 5. Carefully unplug connector # 17 (right side of optional CW filter) by prying up on the plug. Do not pull on the wires. 6. Move the 4 wires (yel, org, brn, red) that run across the far side of the I.F. unit out of the way so the board may be removed. 7. Carefully lift and rotate the board toward the left side of the transceiver to expose the foil side of the board. 8. Using a small craft knife, cut the foil at the 3 points shown in figure 1. (top right corner of the board). 9. Unsolder and discard resistors R194 and R197. They are mounted on the component side of the board and soldered on the foil side. 10. Install a 560 Kohm resistor on the component side of the board as shown in figure 2. This resistor is now designated as R194. 11. On the foil side of the board, add the 3 resistors (R197, 355, 368) as shown in figure 3. 12. Add a small jumper wire as shown in figure 3. 13. Add capacitor C282 as shown in figure 3. Observe polarity and insulate the positive (+) lead with shrink tubing. 14. Carefully place the board in its original position (do not pinch wires) and secure it with the 7 screws. 15. Plug in connector # 17. Move the 4 wires on the far side of the board back to their original position. 16. Put the covers back on the TS-940S and secure them with the 16 case screws. 17. Connect the antenna and power cord then test the transceiver for normal operation.



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