nad 7175 repair

[cordoba11]

I am in the state of maine and i am wondering where i can get my nad repaired, i think it is the volume control. I am sure that i will have to ship it somewhere but all the searches i do on the net just come up with places in california. Any ideas will be appreciated, i refuse to get rid of this killer unit, i think it was made arounf 1987 or so. Thanks ahead of time

 

[TLS Guy]

I am in the state of maine and i am wondering where i can get my nad repaired, i think it is the volume control. I am sure that i will have to ship it somewhere but all the searches i do on the net just come up with places in california. Any ideas will be appreciated, i refuse to get rid of this killer unit, i think it was made arounf 1987 or so. Thanks ahead of time

What is the matter with it? Do you have any local service shops? If it needs a new volume control and it uses the old rotary ganged analog volume control, that can be a real problem, as nobody makes them any more. Everything has gone to remote, and usually digital controls.

I have had to resort to making my own from single pots, which are still available. Results have been variable.

You can get ganged pots to special order, but have to order vast quantities.

This issue is going to lead to the loss of a lot of good older gear.

 

[cordoba11]

I am sure that the volume control is not digital, and it has no remote. Do you know of someone that would know for sure what the deal is with replacement parts, it cracks real bad on both channels, and as you move the volume control around the sound cuts in and out. I cant believe that no one would make these parts for these killer recievers. After getting all new equipment about 4 years ago, sony es 7.1-cerwin vega surrond speaker setup,i was so let down by the small percentage of improvement i was completly disgusted,there was a difference but not to justify the cost and complicated operation. Thank you for any info

 

[TLS Guy]

I am sure that the volume control is not digital, and it has no remote. Do you know of someone that would know for sure what the deal is with replacement parts, it cracks real bad on both channels, and as you move the volume control around the sound cuts in and out. I cant believe that no one would make these parts for these killer recievers. After getting all new equipment about 4 years ago, sony es 7.1-cerwin vega surrond speaker setup,i was so let down by the small percentage of improvement i was completly disgusted,there was a difference but not to justify the cost and complicated operation. Thank you for any info

NAD may have some stockpiled. Quad have a big stash for their older preamps, but they really charge for them.

First I would try some tuner cleaner on the control, that might work at least for a while.

I do quite a bit of vintage restoration, and this issue is getting to be a bigger and bigger problem. Does the control have a switch included? If not I can probably make one that would be satisfactory, if NAD do not have any controls.

 

[cordoba11]

I think it's past cleaning, it sounds way worse than dirty, my friend had a killer kenwood with the same problem he finally threw it out. I don't know what you mean by [a switch] it is a variable knob with a balance control in the center, i would just like to find a first place to start and give them a call, any ideas?

 

[TLS Guy]

I think it's past cleaning, it sounds way worse than dirty, my friend had a killer kenwood with the same problem he finally threw it out. I don't know what you mean by [a switch] it is a variable knob with a balance control in the center, i would just like to find a first place to start and give them a call, any ideas?

Oh dear! A concentric shaft control is the worst problem of all. A volume control with a switch is one that when moved fully anticlockwise switches off the unit. As soon as it moves clockwise it switches on the unit and advances the volume. That used to be very common.

I will research this a bit, but I don't think there are any controls like that made anywhere in the world even to special order. Special order jobs are usually about 2000 units.

 

[TLS Guy]

I have argued with this outfit for years, but they refuse to supply in quantities less than 1200 units. They do make concentric controls.

When I was last back in England, I rounded up all the supplies at my home were a grew up, and shipped out quite a big quantity of potentiometers from mine and my fathers stocks of over fifty years. There are no concentric controls among them.

Since I last searched, this outfit sells ganged controls in quantities of 1, but no concentric controls.

Probably your best bet is to fit a volume control and drill a new whole for the balance control.

This unit is old enough that to get it working will need the hand of a vintage restorer such as myself.

 

[cordoba11]

Tls guy, i have looked in my schematic for my 7175 and the volume control part # is 41-688-0-0 i dont know if this will help or not.Where are you located?

 

[Haoleb]

What is the matter with it? Do you have any local service shops? If it needs a new volume control and it uses the old rotary ganged analog volume control, that can be a real problem, as nobody makes them any more. Everything has gone to remote, and usually digital controls.

I have had to resort to making my own from single pots, which are still available. Results have been variable.

You can get ganged pots to special order, but have to order vast quantities.

This issue is going to lead to the loss of a lot of good older gear.

Actually, you can get ganged pots quite easily. Might want to look in a mouser or digikey catalog once in a while

 

[TLS Guy]

Actually, you can get ganged pots quite easily. Might want to look in a mouser or digikey catalog once in a while

Actually the selection is now very poor, and i have been unable to obtain what I need from either source for some recent projects.

 

[TLS Guy]

Tls guy, i have looked in my schematic for my 7175 and the volume control part # is 41-688-0-0 i dont know if this will help or not.Where are you located?

The first thing to do is see if NAD have the part. NAD boards of that era have the pots soldered directly to the boards, no point to point wiring. So unless you have the exact replacement part with the same physical dimension then some modifications and work a around will be necessary.

What are the values of the potentiometers of that part number in K ohms? It should be on the schematic. The two volume potentiometers will be a log taper and the balance control a single pot linear taper most likely.

I'm located in Benedict MN, and will be glad to help if I can.

 

[cordoba11]

tls guy, i have gone blind trying to find the value of the volume control on the schematic.I have called nad a few weeks back and the only thing they could do was to refer me to a service center in mass, i tried to call them and the person that answered the phone had such a strong foreign accent i could not understand them.I don't know what to do next, i dont want to redesign the wheel or spend a ton of money on it, i have seen some on ebay for not allot of cash but it would be a dice roll not to get one with the same problem.Not sure what to do next.

 

[TLS Guy]

tls guy, i have gone blind trying to find the value of the volume control on the schematic.I have called nad a few weeks back and the only thing they could do was to refer me to a service center in mass, i tried to call them and the person that answered the phone had such a strong foreign accent i could not understand them.I don't know what to do next, i dont want to redesign the wheel or spend a ton of money on it, i have seen some on ebay for not allot of cash but it would be a dice roll not to get one with the same problem.Not sure what to do next.

This is the bottom line. Email NAD and see if they have that part. If they do, it will be an easy repair for me or any other individual with a modicum of skill in this area.

If the part is not available, I can likely fix it, but it won't be easy, and the appearance of the unit will almost certainly change. The position of the volume control will likely have to move slightly, and almost certainly a separate spot will have to found for the balance control.

I think you would be correct to assume that if you buy a used one, then if it does not have the same problem now, it soon will have.

If you can't get the original part from NAD and don't like the idea of changing the appearance of the unit, then send it for recycling.

 

[cordoba11]

TLS guy,i finally got in contact with nad and they do not make the control anymore. I wonder if there are any new old stock guys who might have this part floating around on the internet or elswhere?

 

[TLS Guy]

TLS guy,i finally got in contact with nad and they do not make the control anymore. I wonder if there are any new old stock guys who might have this part floating around on the internet or elswhere?

I was afraid of that!

Your best bet is to post to want it now on eBay. Those guys usually sell there. I think it is a long shot.

If you want me to take a look at it before sending it for recycling, you are welcome to send it to me.

 

[Rickster71]

Calling these guys may be an option.

http://www.audioclassics.com/service.php3

Good Luck

 

[cordoba11]

I might consider doing that, i am thinking about an equivlant replacement but i only want a 2 channel, and something i dont have to use a seperate subwoofer with, and a unit that sounds as good as my nad did, i will let you know as soon as i decide, thanks again for all your input.

 

[DougC]

Tls guy, i have looked in my schematic for my 7175 and the volume control part # is 41-688-0-0 i dont know if this will help or not.Where are you located?

I also have a NAD 7175 and am having problems with it making popping and sizzling noises in one of the channels. Can you please tell me where you got the schematic as I would like to get one before attempting to troubleshoot and repair it.

Thanks,

Doug