UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - NCX-5 powered by NCX-A keeps blowing fuse

snowman_al · 1st Jan 2020, 4:03 pm

If you disconnect the diodes D1-D4 you will isolate the diodes and smoothing caps from the transformer.
If you use the lamp tester with no diodes connected and the lamp still lights brightly all the time you need to check the transformer or shorts in the mains wiring.
If the lamp flares brightly then dims significantly, replace the diodes and caps with new ones. A faulty diode will damage an electrolytic cap.

1st Jan 2020, 4:03 pm	#49
snowman_al Octode Join Date: Dec 2018 Location: Llandeilo, West Wales, UK. Posts: 1,092	Re: NCX-5 powered by NCX-A keeps blowing fuse If you disconnect the diodes D1-D4 you will isolate the diodes and smoothing caps from the transformer. If you use the lamp tester with no diodes connected and the lamp still lights brightly all the time you need to check the transformer or shorts in the mains wiring. If the lamp flares brightly then dims significantly, replace the diodes and caps with new ones. A faulty diode will damage an electrolytic cap. __________________ Never Leave Well Enough Alone...