1. Alle Kabel abmontieren ( Ant , Stromversorgung , ALC , Paddle usw. )
   
   
2. Deckel und Boden abschrauben
   
   
3. seitlich Schrauben des Bedienteils abschrauben .
   
   
4. Bedienteil wegklappen , evtl. ganz abtrennen .
   
   
5. Auf der am Geraet verbliebenen Platine ( X53-3690-10 ) den IC CXD1095Q suchen.
   
   
6. Den 1KOhm - SMD - Widerstand ( Aufdruck 102 ) finden und ausloeten . Er befindet sich links unterhalb des o.g. ICs , rechts neben einer Schraube .
   
   
7. Das Geraet wieder zusammenbauen und verkabeln .
   
   
8. Beim Einschalten auf A=B druecken und damit einen RESET ausloesen . ( Evtl. die alten Voreinstellungen notieren ... )

1. Disconnect the power cord and antenna coax from the transceiver.
2. Remove the top and bottom covers.
3. Remove the top screw from each side of the front panel assembly.
4. Loosen the bottom screw from each side of the front panel assembly.
5. Carefully rotate the front panel forward to gain access to the Control board (X53-3690-10).
   This board is mounted vertically against the body of the transceiver. It is not the board that is mounted in the front panel assembly.
6. Locate and remove the chip resistor R41 from the Control board.
7. Assemble the transceiver then perform the CPU reset procedure by holding the A=B button depressed as power is turned on.

It seems incredible, but there is a lithium battery in the Kenwood TS570 that apparently lasts about 6 months. Replacing it is a major trip into the innards of your radio.

Clif of AVVID (a Kenwood Service center) was kind enough to tell me what to do, and I thought I would write up his instructions and my experience in case someone else needs it.

According to Clif, the microprocessor must reset correctly or the battery will drain quickly. Therefore you must follow these instructions, as odd as they seem.

Before you begin, you need the radio on a nonconductive surface, a phillips screwdriver and a CR2032 battery (Radio Shack has them). You also need the radio's power supply hooked up.

1. Have the radio hooked up to 12V. Turn the radio off but leave the supply on.
2. Remove the four screws from the top of the case.
3. Then remove the 4 screws on the side and lift the top free.
4. Turn the radio over and remove the 4 screws from the bottom that holds the entire case on. Don't bother with the service panel.
5. Turn the radio right side up and notice there are 4 screws (2 on each side) that hold the front panel on. Two of these are in slots, and two are in holes. Remove all 4 screws. BE CAREFUL. The panel is attached with several cables and yanking them loose is probably not a good idea.
6. Carefully separate the panel from the radio chassis. Note the battery in the little holder. The + side of the battery is facing out.
7. The battery holder is spring-loaded; you don't need to open it. Just gently push the battery and slide it upwards, freeing it of the holder and replace it with the new battery (remember + faces you).
8. Reseat the panel, lining up the screw holes and replace the screws.
9. If you want, at this point, turn the radio on and off again.
10. Replace the covers. Remember, don't put the side screws in until the top and bottom are in place.

That's it! According to Clif the problem won't reoccur. We'll see! Just be careful when you attempt this. Lots of things can go wrong. The case is very tight fitting, so don't drop the pieces and bend them out of shape or you will be sorry. Good luck!

UPDATE

As of March 29th, my battery failed again (yep, about 6 months). I have a month left on my warantee, so I'm planning on trying to get something resolved. I'll post here about what I find out.

Kenwood did in fact take the Radio back and apparently installed a diode at no charge. With any luck, this will fix the problem.

1. Disconnect the power cord and antenna coax from the transceiver.
   
   
2. Remove the top and bottom covers.
   
   
3. Remove the top screw from each side of the front panel assembly.
   
   
4. Loosen the bottom screw from each side of the front panel assembly.
   
   
5. Carefully rotate the front panel forward to gain access to the Control board (X53-3690-10). This board is mounted vertically against the body of the transceiver. It is not the board that is mounted in the front panel assembly.
   
   
6. Remove the square cover with 4 screws on it. LOCATE IC 5 go to the lowest point by ic 5 there are 2 resistors between the is 5 chip and the screw hole REMOVE the HORIZONTAL ONE
   
   
7. Assemble the transceiver then perform the CPU reset procedure by holding the A=B button depressed as power is turned on.

Thanks to Mike Faucheaux [email protected] for the picture below.

When the transceiver is turned off, there is a momentary increase in back-up battery current drain. In addition, if a personal computer is connected to the transceiver, excessive back-up battery current drain can occur when the transceiver is turned off. The following circuit changes will eliminate the increased current drain.

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.

Parts required:

Qty   Description                      New Part No.
 2    10 Kohm resistor                 RK73FB2A103J
 1    Diode                            1SS355         *
 1    470 ohm resistor                 RK73FB2A471J   **

* You can substitute an MA110 diode in place of the 1SS355 diode.
** The 470 ohm resistor is only required for S/N 903xxxxx and higher.

Procedure:

1. Disconnect the power cable and remove the covers of the transceiver.
   
   Access the foil side of control board X53-3690-11.
   
   
2. Remove the solder resist from three foil locations.
   
   
3. Cut one foil trace. Do not cut too deep.
   
   
4. Add the two 10 Kohm resistors and one diode.
   
   
5. On the component side of the Control board, replace R36 with a 470 ohm resistor if a 10 Kohm resistor is installed (This must be done from S/N 903xxxxx and higher).
   
   
6. Remove the lithium battery and measure it's voltage. If it measure 2.8 V or less, you need to replace the battery with a new one (part number W09-0873-05).

Battery installation procedure:

Perform the following steps when installing the original or replacement lithium battery.

1. Once the battery is removed from it's socket, wait 20 seconds or more before going to the next step.
   
   
2. Connect a power supply to the transceiver. The transceiver should turn on by itself.
   
   
3. Install the original or replacement battery.
   
   
4. Turn off the transceiver from the front panel power switch.
   
   
5. Reset the transceiver by holding A=B key depressed while turning on the transceiver from the front panel power switch.

Units with a number 3 stamp on the outside box were already modified at the factory.