Question about NAD T752 Receiver
I bought the receiver beginning of 2003 and experiencing
various problems but the most annoying problem is some channels do not
work and can be solved with turn off and on the system.
But last July the problem became permanent, the multi channel went out, digital input can be detected but no sound produced from any channel (I have 5.1 speaker), press “test” button on remote did not produce any sound even tough the test was running from one to other channel. The only sound generated from this system was only from FM radio with stereo mode. OFF/ON or Reset procedure did not solve the problem. I sent the system to local service center and just last week it finally finished. They upgraded the firmware from v1.06 A7 to v1.22 A7 and changed the EEPROM in the keyboard module.
But it just stand for 1 nigh then the problem appear again, multi channel is stop working again and only FM radio with stereo mode is working. Then I made some experiment and found out that analog input with stereo mode also works beside FM radio, other DSP mode does not work for analog input or digital input. Any idea what is going on?
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Posted on Jan 02, 2017
has bad 12 volt regultor and 2 5.1 volt zener diodes on the main board in the regulator circuit, also may have a few caps near these parts which also need replacing. ref # for the 12 volt reg is u703 , kinda a major job.
Posted on Sep 18, 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: NAD T762 - no sound
Try reseating the prologic/output board. Second one from the right (from the front of the reciever), that fixed my no sound problems on many channels. You will have to take out a few screws to remove and reseat it, and while you are at it clean the connections.
Posted on Feb 03, 2008
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
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