We will be continuing maintenance on the wiki starting this Saturday at 9 am (UTC) to Sunday at 7PM (UTC).
There is a possibility of long maintenance-breaks and downtime during this time.
For more information contact us in the wiki Discord or by email at: unto@fighttorepair.org
NAD Monitor Series 3400
The NAD 3400 was their top of the range integrated amplifier built between 1985 and 1989.
NAD Monitor Series 3400
| Problem | Solution |
|---|---|
|
Device stuck in stand by |
Replace all electrolytic capacitors on the digital control board 72-2284-0-0. The 5.5 V cap is a 47,000 μF (47 mF) supercapacitor. |
|
Speaker relays not working or working intermittently |
Resolder and clean switches "Speaker A" and "Speaker B" at front panel, reflow solder joints on speaker relays. |
|
Broken bass/treble potentiometers |
These are dual gang 4-pin potentiometers. The 4th pin is a center tap used for better precision. A dual gang center tapped logarithmic potentiometer of the correct value, that fits physically is not easy to find. I managed to find a replacement on Aliexpress. |
|
bass/treble controls not working as intended |
clean both frequency selection switches with a lubricating electronics cleaner (I use Tuner 600). |
Credit[edit source]
Original article credit: AMelbye