KB2LJJ Radio Mods Database
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1. a common problem in TV sets Replace caps in screen supply PB 1988 C1001 C1002 C1003 and C1004 10 uf 450v Replace 1000pf from the plate of the driver valve to the grids of the 6146b s This is a precautionary measure as the FT101 series had problems here The NB stops working sometimes It appears to be a dry joint on plug pins or the Noise blanker crystal lock board The fix is to solder around the connections the above printed circuit board Fault the RX and the TX stop working except on narrow cw position The fault was a dry joint on the crystal filter XF01 on the IF board I found out that this radio had been used mobile a lot down rough dirt roads The filters are heavy and in the center of the PC board so solder around the rest of the filters on the IF board The transmitter stops working The band change switch is in two parts Its is joined where in goes into the 6146b compartment from a steel shaft to a fiber shaft This becomes loose and the bands do not line up properly It is a good precaution to mark with a marker pen and tighten the screws on the band change switch extension I heard from one FT101zd repairer spending days tracking this one down The FT101zd is designed for the FTV901 series of tranverter via the 11 pin ACC socket The Plate screen and bias voltages are not always wired to the ACC socket This is needed if you want to run the FTV650b 6 meter transverter that is designed for the earlier FT101 series Especial2. KB2LJJ Radio Mods Database my radio I have made the change on 10D for the 11 meters 2 Replace with a correct crystal For 27 000 to 27 500 Mhz use the 33 020khz crystal 27 500 to 28 000 Mhz use the 33 520khz crystal That all folks you radio work now on 11 meters band KB2LJJ FT 101 series convet 11 meter to 12 meter Converting 11 Meter band to 12 Meters for the Yaesu FT 101 series Although this procedure hardly qualifies as a mod too easy it is certainly useful for the FT 101 series owner Conversion to the 12 meter WARC band is as simple as replacing a crystal The 11 meter xtal is replaced with a 30 52 Mhz 3rd overtone xtal in a HC 25 U holder as specified in the FT 101 series maintenance manual No other modifications are necessary as the new band is close enough to the original that the current components work To replace the xtal remove the oop cover and find the xtal board located at right front of the rig Xtals marked xxxx are standard while oooo are optional on some units X5 for the 1 1m band is an option and may or may not be installed 10B 80 10C 40 JJY WWV 1 20 160 15 X5 the 11 meter socket 10A The xtal was ordered from Marden Electronics 800 222 6093 although it is probably available from the other companies which offer this type of item I ll skip the business details here but it is cheap I found fat fingers a hindrance when yanking the old and insterting the new so I used a hemostat narrow nos
3. but unfortunately the hum was still there Then the following step was to checkthe final audio amplifier located in the PB 1964 af unit replacing the output module UPC2002 but no improvement was obtained After checkingthe parts around this module I could verify that the problem was in the 2 wire shielded cable connecting the input of Q01 UPC2002 to the potentiometer of volume in the front panel I desoldered this 2 wire shielded cable at potentiometer end and connect there two new 1 conductor shielded cables soldering together the braids of these wires at the af board end to a good ground point for instance to a solder lug inserted in the screw fixing the UPC2002 to the board Then I desoldered one end of the resistor R06 4 7 K and the negative end of C07 1uF and soldered there the corresponding wires from the potentiometer After this operation the audio hum was removed I suppose this hum could be picked up by the original shielded cable along its way to the volume control Best 73 S EA4BQN CW filter installation for FT 101ZD Remove the topcover of the transceiver case as shown in Fig 1 Refer to Fig 2 and locate the NB FIX circuit board Remove its mounting screws because this board is obstructing the removal of the IF unit Remove the 12 pin 13 pin and 15 pin plugs from their sockets on the IF unit Remove the IF unit mounting screws and remove the IF unit from the transceiver case Install the optional CW filter as
4. shown in the foil side view of the IF unit Fig 3 Make the fastening nuts snug and solder the pins of the filter to the circuit board and remove the 2 jumper wires shown in Figure 3 Re install the IF unit being careful to connect the 12 pin 13 pin and 15 pin plugs in the correct sockets Refer to Fig 2 to be ure Re install the NB FIX unit and replace the top cover of the transceiver When the optional CW filter is installed the CW N position of the mode switch will activate this filter In the CW W position the SSB 2 4 kHz filter will be in use The WIDTH control is usable in all modes http www kb21jj com data yaesu ft 101 htm 4 di 7 05 09 2009 14 53 00 KB2LJJ Radio Mods Database TOP VIEW Figure 2 http www kb21jj com data yaesu ft 101 htm 5 di 7 05 09 2009 14 53 00 KB2LJJ Radio Mods Database c am u gt O Lock Washer http www kb21jj com data yaesu ft 101 htm 6 di 7 05 09 2009 14 53 00 KB2LJJ Radio Mods Database Faults FT101zd MK 1 2 3 Author ZL3MH On 10 meters the Transmitter takes off on HF or with the tranverters being used The problem is dry joints or earthing points around the 12BY7 The fix is to Solder points on and around the 12BY7 printed circuit board Fault blows main fuse every 1 2 to up to 6 hours and is not the 6146b s flashing over There are vertical type caps in PB 1988 and the internal fluids run down and ark across the narrow gap in the caps screen supply
5. KB2LJJ Radio Mods Database Home Radio Mods Database and Manuals Modifications for the Yaesu FT 101 FT 101 series convet 10 meter to 11 meter FT 101 series convet 11 meter to 12 meter Replace finals in FT 101E FIT 101 Mod for 30 meter 10MHz Transmit Audio hum in Yaesu FT 101 ZD CW filter installation for FT 101ZD Faults FT101zd MK 1 2 3 Click to download the Manual s FT 101ZD Filter Instalation pdf FT 101ZD Manual and schematic pdf FT 1 1ZD Service Manual pdf FT 100D Operator Manual pdf FT 100D Service Manual pdf FT 100D Spanish Manual pdf FT 101 Manual pdf FT 101B Manual pdf FT 101b e service v6 pdf FT 101E Manual pdf FT 101E Schematic and acessories pdf FT 101F Manual pdf FT 101 series convet 10 meter to 11 meter The mod is to easy it is certainly useful for the FT 101 series owner Conversion to the 11 meter CB band is as simple as replacing one of the 10 meters crystal that can be 10A 10B 10C 10D or AUXILIARY depend the band you be more interested to keep on 10 meters The new 101 radio come with 11 meter all the new model s have 60M 80M 40M 20M 15M 10A 10B 10C 10D 11M or AUXILIARY 1 Open the radio and looking for the crystal s block The block is close to the band switch on your right side check it before you doing something Read the manual I have one FT 101 30 years ago but my is the first series yaesu made On http www kb21jj com data yaesu ft 101 htm 1 di 7 05 09 2009 14 53 00
6. ed locking type device with seconds often found in hardware stores etc After checking with a local ham who monitored my transmissions to make sure I was where I thought I was I was in business with 12 meters for my FT 101B How d it go After warming up the rig I spun the dial a bit on what has been a mostly dead band this summer The first station I heard was a little weak AA5QC no it s A35QC I had no idea where that was but I gave him a call It turned out to be JFIWQC vacationing in TONGA my first African contact and a 59 report at that So here s an easy way to add a WARC band and open new possibilities for DX adventure with your FT 101 series rig Please let me know if you have any additional feedback or comments on what has to be one of the easiest mods ever 1 This is another story note that it is a receive only band for 10 Mhz for now See Page 70 of the Nov 83 issue of 73 Magazine if you can t wait http www kb21jj com data yaesu ft 101 htm 2 di 7 05 09 2009 14 53 00 KB2LJJ Radio Mods Database Replace finals in FT 101E There will come a time when the finals in your FT101E will need replacing These transceivers were originally equipped with 6JS6C tubes manufactured by NEC This tube s properties are slightly different from the 6JS6C tubes available today from American tube manufacturers By the way don t bother looking for tubes made by NEC They got out of the business several years ago In order t
7. ly the MK3 model did not have the above wiring Both the FTV250 and FTV650b can be used with this mod on all FT101zd s Modifications and faults collated from around ZL by ZL3MH http www kb21jj com data yaesu ft 101 htm 7 di 7 05 09 2009 14 53 00
8. o use the American variety 6JS6 s a simple modification to the neutralization circuit must be made to the final section of the transceiver The modification consists of replacing the fixed value 100 pf 1000 VDC mica capacitor with a 10 pf 1000 VDC mica capacitor This capacitor C125 is in series with the 10 pf variable neutralizing capacitor off of the plate circuit If this modification has not already been completed on your rig be sure to use a mica or silver mica of at least 1000 VDC Do not substitute a different type because the heat in the final compartment will change the value and your tubes will fail prematurely Also be very careful to keep all leads short and in exactly the same orientation as the original capacitor Before reneutralizing open the variable neutralizing capacitor all the way to minimum engagement and follow the neutralizing instructions in the manual While dipping the plate remember to adjust the neutralizing capacitor for equal value meter reading peaks IC position on both sides of the dip when tuning the Plate control FT 101 Mod for 30 meter 10MHz Transmit I made several of these mods about ten years ago but I am a little fuzzy The FT101 uses 10mhz for its WWV position but they left out the driver and final coil connections in the transmit section of the radio So you either add coils or you can jump the band switch in the driver portion and the final section Connect a jumper from the 20meter driver c
9. oil tab to the WWV driver tab and the 40 meter final coil tab to the WWV final tab This will make the driver tune in the 40meter position and the final will dip around the 20meter position A cheap mod for another band Good Luck but remember that packet or rtty is continious power so you need to back off the Terry WAG6RNF Boise Idaho Audio hum in Yaesu FT 101 ZD Author Jose Miguel Fernandez EA4BQN I have always liked transceivers with tubed final stage for several reasons but mainly because it is nice to hear from your correspondent you have a very good modulation it sounds different the tubes job is noticed In addition of that I have to say that tuning these transceivers is not a trouble for me and also that up to now all the servicing needed by my3 tubed transceivers 2 Yaesu FT 101 ZD and 1 Yaesu FT 102 has been performed by my self One day I noticed in one of the Yaesu FT 101 ZD a little hum which could be heard at minimum volume level and when the radio was switched to transmission with the PTT Tt wasn t a great trouble but when you want to have things working as better as possible you are forced to try finding the problem http www kb21jj com data yaesu ft 101 htm 3 di 7 05 09 2009 14 53 00 KB2LJJ Radio Mods Database The first suspicious were the electrolytic capacitors of the power supply and they were all replaced by new ones even the pair of 200 uF 500 volt on the high voltage rectifier
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