Broken Diode And Shorted Tantalum Capacitor Found In NAD C300 Amplifier
Those of you who have not read my previous article (September, 2017) on this amp, may please read : https://jestineyong.com/shorted-mosfets-and-bad-capacitors-in-amplifier/
My friend brought this set back to me (May, 2019) stating that the power on LED was not working. I opened and cleaned the set and looked for the trouble maker component/s in the set.
I had to remove the front panel to get access to the board. Found a diode broken and one tantalum capacitor short! Replaced the diode with IN4148 and capacitors by normal ceramic capacitors. Found the LED working fine:
Assembled the set back after changing the awkward looking knob to a better one covered by black tape.
Tested it once again thoroughly. It worked fine for several hours, before customer came to pick it up.
Thus, the second part of servicing C300 NAD Amp, concludes, after which the ‘satisfaction’, which has by now become automatic, jumped into the bag happily this time too, i.e., twice on the same set!
This article was prepared for you by Parasuraman Subramanian from India. He is 70 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.
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You may check on his previous repair article below: