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Posted on May 10, 2017
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NAD C340 amp circuit board connector

The motorized volume control on my NAD C340 integrated amp stopped working. After reading some advice here, I checked the connection inside from the main circuit board to the small board containing motorized volume and tone controls. I played with the 6 wire ribbon connection a bit and the motorized volume started to work but I lost the left channel. The 6 wire ribbon seems to have bare wires that push into a socket on the main board. How do I remove the ribbon from this socket to clean the bare ends to get a better connection?

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Anonymous

  • 1 Answer
  • Posted on Sep 25, 2007

SOURCE: NAD C340 has lost ability to switch between inputs

I have the same problem which started about a month ago and seems to be getting worse. I also noticed today, that 1 channel is significantly louder than the other - fault in the pre-amp stage, as feeding the power stage directly gives balanced, albeit extremely loud sound! Looking on eBay, I found someone else selling an amp with both problems. It would nice to think that NAD would acknowledge a design flaw, and fix for free, but my amp is 5 year old.

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Anonymous

  • 49 Answers
  • Posted on Oct 31, 2009

SOURCE: what is the maximum speaker wattage for a NAD c340

The specs say 2x50W into 8 ohms. I could not located the 4 ohm specs, but it is logical to assume that you can run 2x100W into 4 ohms.

The back panel seems to imply that 4 ohms is a limit for speakers.

So any speaker over 100W capability should be fine, either 4 ohms or 8 ohms.

gopakumarg43

The Knight

  • 76851 Answers
  • Posted on Jan 24, 2012

SOURCE: NAD M3 power light turns red immediately and PROTECT message displays. Amp keeps functioning but volume control doesn't work up or down.

Hello
Check the connection to speaker with this amp, for any short or any other fault. disconnect the outputs, ie, speakers from the amp, and switch it On, and see the protect display comes or not. If it comes, the fault is internal and the set need service.
Your M3 dual Mono integrated amp, is of high output power and its outputs are protected against any overload or short circuit. If the system detect any among this condition specified above, it will show protect mode display.
Never load this amp, as protection display is there, as it may damage the speaker or its internal power amplifier section circuits, may cause more money to get it repaired. OK.

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Related Questions:

1helpful
1answer

Cracking noise nad c340
Sometimes you can find the faulty part by touching the parts inside the amp. Only touch the plastic parts not any metal parts! As it is on one channel you have a good channel to compare the bad. Often small transitors can become noisy so start with them!
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Nov 18, 2012 • NAD C340 Integrated Amplifier
0helpful
1answer

NAD M3 power light turns red immediately and PROTECT message displays. Amp keeps functioning but volume control doesn't work up or down.
Hello
Check the connection to speaker with this amp, for any short or any other fault. disconnect the outputs, ie, speakers from the amp, and switch it On, and see the protect display comes or not. If it comes, the fault is internal and the set need service.
Your M3 dual Mono integrated amp, is of high output power and its outputs are protected against any overload or short circuit. If the system detect any among this condition specified above, it will show protect mode display.
Never load this amp, as protection display is there, as it may damage the speaker or its internal power amplifier section circuits, may cause more money to get it repaired. OK.
Read full answer
Jan 23, 2012 • NAD M3 Master Series Integrated...
0helpful
1answer

Unsure of connections from nad c340 to power amp, cant get both speakers working

It sounds like you're guessing.


Have you looked at the manual?


Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/NAD-C340-Amps-manual/id/8043dj588/t/2/

Page 7.

Tell us about the source(s) that won

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Mar 25, 2011 • NAD C340 Integrated Amplifier
0helpful
1answer

NAD C320 system sounds like a cheap, tinny tranny
Let's distill this down to its simplist configuration. FM source, stereo.

BTW, a search for NAD 440 only brings up a C440 >>>Tuner<<, no receivers. Are you sure about that model number? The only receiver model numbers with x40 on the NAD website are the C340 and C740, neither of which has a link to a manual (go figure). I have the C740 manual, so I'll use it for a loose reference.

If it still does what you're describing in a basic configuration and the volume control seems to affect it like you belatedly mentioned, I'd suspect a noisy volume control or some other control in the receiver (like a rarely used Tape Monitor switch) that is always there in the circuit but may have oxidized contacts and responds sometimes to burn-through.

Set the volume at a medium setting and repeatedly operate every switch, knob and button (one at a time) to gauge its effects on the sound. You may find one is the culprit. Then it's a matter of accessing it for a shot of contact cleaner.

If you have jumpers between Pre Out and Main In, it might be a good idea to reseat them, too.
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Mar 23, 2010 • Audio Players & Recorders
0helpful
1answer

What is the maximum speaker wattage for a NAD c340 integrated amplifier?
The specs say 2x50W into 8 ohms. I could not located the 4 ohm specs, but it is logical to assume that you can run 2x100W into 4 ohms.

The back panel seems to imply that 4 ohms is a limit for speakers.

So any speaker over 100W capability should be fine, either 4 ohms or 8 ohms.

Read full answer
Oct 30, 2009 • NAD C340 Integrated Amplifier
0helpful
1answer

Need a transistor spare part for NAD C340
Odd a transistor would have such a #. No 2Fanything series. It is most likely a 2SA949.... a PNP audio driver transistor.
It can be replaced by a NTE-383 (ECG383) transistor, though it's best to order the original # from a Japanese semiconductor supplier like MCM in Ohio.
It's best brought to a good hi-fi or guitar amp repir shop for a proper go-thru & repair.

Mark S. CET Sr. Dover, NH
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Nov 06, 2008 • NAD C340 Integrated Amplifier
1helpful
1answer

I have a Sony TA FB940R (HiFi stereo amp) and the volume control reverts to the silent position, ie it rols back and won't stay put. As if a damper has been damaged or stopped working. Can you suggest a...
Hi,
If you are tech guy then follow below technical instructions to fix your Amp problem.
Amp has motorized volume control and motor drive circuit has problem so motor rotates just one side (ends up volume) Below picture shows how is motor board and what drive IC is to power the volume motor.
You need to check voltages at pins and replace bad IC.

02e7045.jpg

f090c04.jpg
It is very simple circuit and easy to repair.
Good luck.

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Oct 25, 2008 • Audio Players & Recorders
0helpful
1answer

GARMIN C340 VOLUME CONTROL
I had the same issue. My C340 fell of the dash and the volume control (potentiometer) broke off and was rattling inside the case. I tried to find a replacement (103B stamped on the pot) but have not been able to find one. I tried a mini 10K ohm pot from Radio Shack, but the posts were not properly positioned for the circuit board inside the Garmin.

I took the easy way (for now) and simply strapped the two control points together with a piece of wire giving me maximum volume. Orient the circuit board with the missing volume control to at the bottom right. The control mounts with 5 points, two on the right edge of the board are simply physical mounts. There are three other connection points just to the left in a slight arc. The top and bottom point have holes to place the legs of the pot. The broken off legs may still be in these holes. Solder a piece of wire between the top and bottom points. Be careful since the solder pads (to the left of the holes are very delicate.

Not an elegant filx, but you get the voice back.

Jim H
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Sep 03, 2008 • Garmin StreetPilot c340 GPS Receiver
1helpful
3answers

NAD C340 has lost ability to switch between inputs
I have the same problem which started about a month ago and seems to be getting worse. I also noticed today, that 1 channel is significantly louder than the other - fault in the pre-amp stage, as feeding the power stage directly gives balanced, albeit extremely loud sound! Looking on eBay, I found someone else selling an amp with both problems. It would nice to think that NAD would acknowledge a design flaw, and fix for free, but my amp is 5 year old.
Read full answer
Jul 14, 2007 • NAD C340 Integrated Amplifier
0helpful
1answer

Amplifier cutting out when volume is increased
yea my friend your audio ic or transistor is either getting faulty or you have lose connection have a tech look at your set and make the nessecary repairs.good luck
Read full answer
Apr 26, 2007 • NAD C340 Integrated Amplifier
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