Hi Gang,
I hope everyone is fairing well during these challenging times!!!
I have on the bench a 2970 N4 with no transmit. I disconnected the amp to see if the radio was transmitting and it was not. I check the AM regulator and it was bad. The driver and 2 final mosfets tested fine. I replaced the regulator and he is the issue. The center pin of the regulator is reading 11 volts (not 13) and the center pin on the final mosfets are reading 11 volts on AM and SSB. The center pin on the finals should read 6 volts on AM and 13 on SSB. I am pouring through the schematic and am unsure where to turn at this point.
Any thoughts?
I bought the regulators from Digikey BTW.
Thanks as always!!!
I hope everyone is fairing well during these challenging times!!!
I have on the bench a 2970 N4 with no transmit. I disconnected the amp to see if the radio was transmitting and it was not. I check the AM regulator and it was bad. The driver and 2 final mosfets tested fine. I replaced the regulator and he is the issue. The center pin of the regulator is reading 11 volts (not 13) and the center pin on the final mosfets are reading 11 volts on AM and SSB. The center pin on the finals should read 6 volts on AM and 13 on SSB. I am pouring through the schematic and am unsure where to turn at this point.
Any thoughts?
I bought the regulators from Digikey BTW.
Thanks as always!!!