Last week I received a Kenwood TKR 720 VHF HAM band repeater for repair. It was traveling all over the country for the last five years to get a proper repair! On this travel it lost many spares, which includes the EEPROM chip (94LC 46)from the IC socket and the shielding covers.
Comparing with another TKR 720, I could set right most of the Boards. The earlier experts who tried to remove the various modules from the double sided TX-RX card, taken away few SMD resistors also, may be unnoticed. Two of the 1K resistors were from the RX and TX line, which made the equipment deaf and dumb (=dead)! The front panel also have another 94LC 46 soldered, near the micro controller uPD75104G-604-1B. My present problem is to replace the micro controller which is not functioning,( I replaced it from the other set along with the 94LC46 to confirm the defect!) Can I procure the micro controller from any source and replace it simply by soldering? OR Need a pre-programmed one from the KENWOOD? Very remote chance for us. Can any of our supporters locate one for me on payment? Do we have to replace the nearby 94LC 46 also? How to program it? I have the KPT50 for the EEPROM programming of the TKR 720, but it can only be used for the frequency and other parameters set inside of the KPT 50. Commends are thankfully welcome PETER VU2PJP
