Help: Problem with TS-830S
Thanks for reading this posting.
I need some help from experts. My TS-830S stopped transmitting. It was working fine until few months ago, then it shows a little delay on transmit. When I pressed PTT, the first couple of seconds get cut off in the beginning. After this point, everything seems working fine with good power. I thought it was caused by faulty driver or final tubes, so I replaced all three tubes. After I replaced all three tubes, the symptom disappeared but I ran into a new problem. I was turning the TC1 trimmer to neutralize the final, and I saw a small sparks and smelled some burn. From this moment, no output power. When I turn the meter to Ip, it goes to infinite on transmit even if I try to adjust it using the BIAS pot. The voltage on the plate seems OK. Does anyone know what the problem might be? I think one of resisters or caps got burned but I can't see it since the board is under the chassis. Should I take it apart and check it out? Any input will be greatly appreciated. Thanks. Chris VA3UT |
You may have smoked the 20 ohm 1/2 watt final cathode resistors R2, R3, R4,
R5. This can give the symptoms you describe, no output and pegged plate current reading. The plate current is not actually high, but the meter reads the voltage across the cathode resistors to display current, if they are open it reads very high. Be sure to use a non-metalic adjusting tool around the finals. Good luck, the TS-830 is a fine old radio, I have had mine for 20 years and it is still doing its job for me. -KJ4DU "Chris" wrote in message .. . Thanks for reading this posting. I need some help from experts. My TS-830S stopped transmitting. It was working fine until few months ago, then it shows a little delay on transmit. When I pressed PTT, the first couple of seconds get cut off in the beginning. After this point, everything seems working fine with good power. I thought it was caused by faulty driver or final tubes, so I replaced all three tubes. After I replaced all three tubes, the symptom disappeared but I ran into a new problem. I was turning the TC1 trimmer to neutralize the final, and I saw a small sparks and smelled some burn. From this moment, no output power. When I turn the meter to Ip, it goes to infinite on transmit even if I try to adjust it using the BIAS pot. The voltage on the plate seems OK. Does anyone know what the problem might be? I think one of resisters or caps got burned but I can't see it since the board is under the chassis. Should I take it apart and check it out? Any input will be greatly appreciated. Thanks. Chris VA3UT |
hi,
You have rec'd good info, here is another resource, come on over and join other ts-5xx ts-8xx users ! http://groups.yahoo.com/group/TS-520_820_530_830/ ed |
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