Author Topic: RRC will not turn off K3 anymore  (Read 201 times)

oh2xx

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RRC will not turn off K3 anymore
« on: 2020-05-12, 18:15:46 »
Hi,

Our RRC has worked fine for many years. Last week I was not able to turn the radio on anymore. It turned out that the RRC at remote radio site keeps K3 turned ON all the time. Even pressing the power button on K3's front panel (at the radio on the remote site) didn't turn the radio off. We had to plug off the "ACC(DE15M connector) <-> RJ45" cable at the RRC end to be able to shut down the radio. We tested this even with RRC powered off and the symptom was the same so it seems like the RJ45 connectors Pin #5 is grounded all the time. Is there a way to fix this?

73 de Kari, OH2XX

sm2o

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Re: RRC will not turn off K3 anymore
« Reply #1 on: 2020-05-12, 19:02:20 »
Hi

The K3 is turned off by CAT command not by the hardware signal, but if the hardware signal is kept active when the shut off command is received, the K3 will be in a middle mode, display backlight on but not showing anything. There is not much between the CPU and the output, T1 a FET-transistor = FDV301N which is showed on page 233 in the manual. They are very rugged we have not changed many during the years

73 de mike

oh2xx

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Re: RRC will not turn off K3 anymore
« Reply #2 on: 2020-05-12, 19:10:29 »
Hi Mike,

Thank you for your prompt reply! Yes, we suspected those FETs too and will replace them as a next step.

- Kari

oh2xx

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Re: RRC will not turn off K3 anymore
« Reply #3 on: 2020-05-15, 18:44:44 »
FET changed and now it works  :)