Hi all
I have a NAD 2200 that is stuck in protect mode. I’ve had it For over 20 years and it has some sentimental value so would like to get it up and running again. I turned it on after a few months being off and the relays had a few attempts of clicking On and eventually stopped.
I’ve checked all fuses and can’t see any burnt out parts, the caps aren’t bulging. The relays have been replaced with fully sealed versions at some stage and don’t believe they are the culprit as when fiddling I must have grounded them and they clicked on and off. DC offset before the relay seems within spec. I’ve measured the voltage in a few different spots and found it to be high (see image).
My electronics knowledge is pretty low so sorry if I ask some stupid questions. Firstly, am I looking In the right spot? Does the voltages suggest a particular part I should be checking?
Cheers for the help!
I have a NAD 2200 that is stuck in protect mode. I’ve had it For over 20 years and it has some sentimental value so would like to get it up and running again. I turned it on after a few months being off and the relays had a few attempts of clicking On and eventually stopped.
I’ve checked all fuses and can’t see any burnt out parts, the caps aren’t bulging. The relays have been replaced with fully sealed versions at some stage and don’t believe they are the culprit as when fiddling I must have grounded them and they clicked on and off. DC offset before the relay seems within spec. I’ve measured the voltage in a few different spots and found it to be high (see image).
An externally hosted image should be here but it was not working when we last tested it.
My electronics knowledge is pretty low so sorry if I ask some stupid questions. Firstly, am I looking In the right spot? Does the voltages suggest a particular part I should be checking?
Cheers for the help!
Your link doesn't work for me .
This fault turns out to be "standard practice " in this range of models when one guy complained he was followed by many others .
Bad soldered joints was one problem solved centered around the relays --shop told him its well known there are cold soldered joints in the relays --he also had a capacitor overhaul
This fault turns out to be "standard practice " in this range of models when one guy complained he was followed by many others .
Bad soldered joints was one problem solved centered around the relays --shop told him its well known there are cold soldered joints in the relays --he also had a capacitor overhaul
remove Q401 and test- it looks like it is could be shot, the protection IC may also have fried. Also replace all the small caps around the protection circuit. as you are getting 0v on the amp outputs (pin 2) the main amp sections could be OK
https://imgur.com/download/UxhGqge
Hopefully this Image link works?
Thanks for the tips. Will take a look.
Hopefully this Image link works?
Thanks for the tips. Will take a look.