Re: NBTV Television Analyst
Posted: Tue Jun 16, 2020 2:01 pm
Proceed one stage at a time...unplug the transformer secondaries - so they are not feeding the power supply rectifiers etc.. If it doesn't blow the fuse check anyway the output of each winding - they'll be higher than usual due to having no load.
If that's OK, plug the transformer output into the power supply board and disconnect all outputs from it - measure the DC output voltages...again they may be a bit high due to no load - if no fuse blow leave it on several minutes, recheck.
If still OK, the next suspect is the EHT generator. There's a link shown between the +12V supply and the EHT generator (W801/P801), remove it. One-by-one plug everything else in. If that's the last thing unpowered it's probably the culprit. Ah! It appears W801/P801 are part of a multipole connector, so that suggestion might be not so easy...
Steve A.
If that's OK, plug the transformer output into the power supply board and disconnect all outputs from it - measure the DC output voltages...again they may be a bit high due to no load - if no fuse blow leave it on several minutes, recheck.
If still OK, the next suspect is the EHT generator. There's a link shown between the +12V supply and the EHT generator (W801/P801), remove it. One-by-one plug everything else in. If that's the last thing unpowered it's probably the culprit. Ah! It appears W801/P801 are part of a multipole connector, so that suggestion might be not so easy...
Steve A.