Question about Yamaha Audio Players & Recorders
Channel works in analog mode (AM/FM radio). All other channels work fine, indicating a problem with the DSP card. Can card be repaired or replace only?
SOURCE: channel not working
If the Logitech Pulse 475 is the same as the Labtech Pulse 475 then the left channel amplifier probably blew. The Labtec uses a 5 pin TDA2030A, which costs around $3. You will need to know how to solder to repair this. The back of the case comes off by removing the 8 screws around the back of the case and lifting it out by the power cord. Then, simply desolder the left channel amplifier marked IC201 (it's on the leftmost side of the board, next to the volume potentiometer) and solder the new amplifier in it's place.
Posted on Oct 30, 2006
sometimes if the power cable and the ground cable are frayed and touch it will short out the amp temporarily check to make sure allof the wires aren't touching each other
Posted on Aug 14, 2007
I had the same problem with the right channel. It turned out to be a broken wire inside the receiver; it can be found connecting from the main PCB to the card for the 5.1 board. After repairing the broken wire, it has worked fine. The harness connects the 5.1 low level signals to the board which are then redistributed to the amplifier section. It is a bundle of wires in gray casing and with red, black and white wires (with shielding). Find the offending wire, repair or replace and it should be fixed. Hope this helps
I had the same problem with the right channel. It turned out to be a broken wire inside the receiver; it can be found connecting from the main PCB to the card for the 5.1 board. After repairing the broken wire, it has worked fine.
The harness connects the 5.1 low level signals to the board which are then redistributed to the amplifier section. It is a bundle of wires in gray casing and with red, black and white wires (with shielding).
Find the offending wire, repair or replace and it should be fixed.
Hope this helps
Posted on Oct 27, 2007
SOURCE: Right Channel Not Working
I have had the front, left and right channels go out over time. I have fixed all of them, and each time it has turned out to be a cold solder joint. While I love NAD and will continue to purchase there equipment, this generation is plagued with poor workmanship.
To fix the channel going out, I removed the top cover. Back cover and 2nd card from the left (looking at the receiver from the back side). This card handles all of the audio processing. I have found cold solder joints all over this board which has caused channels to suddenly go quite. I have never found a bad component. Also, I have cleaned the interconnect to be backplane (board that the audio processing board connects to) in the case of the center channel going quite.
If you have poor FM reception, the first board from the left (looking at the receiver from the back side) may have a cold solder joint on the coaxial connection for the FM antenna.
Posted on Jul 13, 2008
The easiest way is to buy the new part online and replace it - cost about $50US.
However, if you're up to it, this problem is fixable without the need to buy any parts. The selector switch has four sets of spring contacts which need to be bent slightly to increase the pressure on the pads against which they press, but it's a tedious job and not for the faint-hearted.
Here's what you need to do:
Open the case (6 screws) and also free up the front panel (9 screws).
You'll see that the switch consists of a PCB, an aluminium box and a motor. Remove the two screws holding it to the front bulkhead. take oyr the small "L" shaped circuit board that overlays it. A plastic pop-in holds the bottom of the switch PCB and the switch assembly can then be removed entirely.
Next you will need to remove the aluminium switch box from the PCB. Firstly de-solder all the connections which hold it in place. Now pull it clear.
Here is the MOST critical part of the job: inside the switch box you'll see four circular plastic wafers - these contain the contacts you need to fix and you'll need to bend the tangs which hold the shaft assembly onto the housing and then the tags which are holding the wafers in place. Your difficulty will be making sure that the wafers go back on the shaft with the rightr alignment and that the wafers go back in the same order.
Take some digital pictures while the wafers are still on the shaft with the orientation of the KNOB included - if you mess this up (I did) the job becomes horrible! Also, mark each wafer with a number 1-4 because there are three different kinds Once you are comfortable that you can replace the wafers in the proper rotary configration with respect to the shaft, remove them individually and pop out the gray plastic cores and bend the spring contacts upwards so that they will go back pressing more firmly against the pads. Now reassemble, and good luck!
Posted on Dec 29, 2008
Tips for a great answer:
EFFECT : Use these buttons to increase or decrease
the amount of effect applied in a DSP or Advanced
Theater mode. When the amount of effect is
increased in a DSP/Advanced Theater mode the
characteristics of that mode become stronger and
more noticeable. The scale ranges from 10-90 with 70
as the default setting. First turn on the DSP/
Advanced Theater you want (by pressing the DSP/
Advanced Theater button until you get the mode) and
then increase or decrease the amount of effect.
CH SEL : You may want to adjust the channels when
listening to some sound sources. Use this button to
select the channel you want to adjust.
+/- : Use these buttons to select the amount of effect
in a sound mode and to adjust the channel"
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