Kenwood TS-570DG (TS 570 DG TS570DG) user and service manual, modifications

   
 
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Kenwood TS-570DG (TS 570 DG TS570DG)
TS-570DG
Programming interface schematics for Kenwood :
Programming software for Kenwood TS-570DG (TS 570 DG TS570DG) :
PDF User Manual for Kenwood TS-570DG (TS 570 DG TS570DG) :
PDF Service Manual/schematics for Kenwood TS-570DG (TS 570 DG TS570DG) :

Mods for Kenwood TS-570DG (TS 570 DG TS570DG) :
   Kenwood TS-570DG (TS 570 DG TS570DG) to G upgrade
   Kenwood TS-570DG (TS 570 DG TS570DG) Repair of the TS-570D internal antenna tuner
   Kenwood TS-570DG (TS 570 DG TS570DG) Few mods for TS-570
   Kenwood TS-570DG (TS 570 DG TS570DG) Audio limiter mod. for TS-570D
   Kenwood TS-570DG (TS 570 DG TS570DG) TS-570 Back-up battery current drain
   Kenwood TS-570DG (TS 570 DG TS570DG) TS-570 Batteries
   Kenwood TS-570DG (TS 570 DG TS570DG) MARS/CAP Modification
   Kenwood TS-570DG (TS 570 DG TS570DG) Problem width the memories

Kenwood TS-570DG (TS 570 DG TS570DG) technical specifications :  Kenwood TS-570DG (TS 570 DG TS570DG) technical specifications

Kenwood TS-570DG (TS 570 DG TS570DG) Repair of the TS-570D internal antenna tuner

Hi

Suddenly I found my Kenwood TS-570D's internal antenna tuner reacting strange. The tuner didn't sounds like the days before and it couldn't tune at bands it could many times before. I inspected my antennas and found everything fine. By connecting the Kenwood TS-570D (ANT1) to my 50 ohm dummy load and pressed the 'AT TUNE' button, for more then about 1 sec., the internal antenna tuner couldn't tune at 12 and 20 meter - the automatic tuning continues again and again and 'error beeps' appears from the speaker... When deactivating the internal antenna tuner, by a quick press at ‘AT TUNE’, the SWR was 1:1 at all bands.

I removed the top of my Kenwood TS-570D and the metal shield around the internal antenna tuner section. Unfortunately I couldn't found anything strange in the section. By doing some very simple DC resistance measurements I found capacitor C816 (18pF/2kV) having a leak of about 250 ohm. I removed the capacitor by cutting it away – do not try to solder out the capacitor since the PCB is easy to damage!

I contacted Surplus Sales of Nebraska and bought some 6kV type capacitors of 18pF and other capacitors matching the other original capacitors in the internal antenna tuner but with higher voltage.

The dimension of the 6kV capacitor is lager then the 2kV original but when I removed the piece of rubber, placed between the relays and the metal shield around the internal antenna tuner, there was plenty of space for the new 6 kV capacitor. I soldered the new 6kV capacitor legs to the two pads where I was cutting the old 2kV C816 capacitor away a few days before.

After assembling my Kenwood TS-570D all works really great! I can now tune all bands on the 50 ohm dummy and my HF antenna - the repair has worked great for more then 8 months now (jan. 2005)!


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