Tx mod for TS-50S originally from Sydney, Australia in 1995.
Review the mod where the coloured picture of the control board is provided. This shows a picture of D5. The pads for D1 through D5 are obvious on the control board which is piggy backed on the PLL board with 2 multipin sockets and 2 screws.
This radio only had D4 obvious - snipping it did not do the job. D1, D2 and D3 were not fitted. (D5 not fitted next to D4 - see below)
Disconnect the power.
Ground the radio and keep one hand on the metal work or use a wrist strap to ground yourself. Locate the Control Board as it says in the Instruction Manual for "Options Installation" and "TCXO UNIT (SO-2)".
Remove the control board as it says in the book.
The 3 plugs are not as such plugs - the catch bar releases the ribbon cable and is easy to push apart but a bit fiddly to get back in. 3 hands might be needed and you have to push the bar down as well as in. Very little force is needed. Do not force it - if it wont go in then you have not got the right angle.
The 2 screws required the use of a special tool which was not available. A fine pointed set of side cutter wire snips can be used to tightly grip the round headed screws by the dimples.
Suggest you locate the 2 white plug/sockets visually by looking under the Control Board before you pull off the Control board from the PLL board so that you dont bend the pins since it has to go strait up at both ends.
Under the board (under D5) was found what looked like a blob of opaque glue about 4mm diameter. Under this glue could be seen a black speck. The glue was levered off and a Surface Mount diode came off with it - breaking away from the PCB track. Diode about 1.5*1mm. Obviously this blob was doing the function of D5 which was pictured in mods.dk
A full "Microprocessor Reset" as it says in the Instruction Book gave the desired result.
Other changes were also successfull.
See instruction manual "MENU SET-UP"
USB below 10MHz - alter Memory location A04 from "SSB" to "ULC".
Double Zero on frequency display - put "85" into memory B70 instead of "82".
Note also the mod in mods.dk which explains what to do if the memory battery is changed or disconnected. On replacement of the memory battery you have to cycle the radio on and then immediately off otherwise the memory battery drain is 1mA and it will go flat very quickly.
PS WANTED: Does anyone know of a mod to make the Kenwood TS-50S radio switch on with the Low power option setting set. Altering Memory A00 to 10 does not do this. The radio switches on in the power setting you last used it in, which is not good for manual tuning if that happened to be high power.
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