The LCD display on my NAD 712 receiver quit working. The problem has been isolated to the backlighting for the dispalay (if I shine a flashlight from the backside, the display is visible with valid data). The backlighting consists of two small light bulbs mounted on a small circuit board (1/2" x 1.5"). The bulbs are 4mm in diameter and ~10mm tall (without leads). I measured the voltage supply to these bulbs at 5.5V DC. The bulbs are wired in series. Where can I find a part number and/or supplier for these bulbs? I assume that they must have either a 2.5V or 3.0V rating, but I have not idea regarding current draw. Any suggestions?
Http://www.bulbdirect.com/ who's your mommy? ;]
Replace the incandescent lightbulbs with two or three high intensity blue or white LEDs. You will need current limiting resistors based on what the actual voltage is to the bulbs. The LEDs and resistors are readily available at Radio Shack or your local electronics shop, or Mouser.com.
SOURCE: Nad 712 output issues - Mute flashing
The only thing I can tell you for sure is that the mute indicator always flashes (very dimly) when the receiver is off. I have no idea why, but mine has always done this.
SOURCE: NAD 712 Display unit
On my system the bulbs burned out some time ago. Today, I bought a pair of 12v micro lamps at Radio Shack (part 272-1092). Then removed the board behind the display and replaced the bulbs. This required some soldering. The bulbs have held up for more than 6 hours, so I do not think they are going to burn out.
SOURCE: will NAD 712 accept an iPod Docking Station?
A 712 is not set up to use an Ipod USB dock. You can buy a dock that will use RCA jacks into an old stereo - Apple sells them, others too. Then the Ipod sits up and you can look at it. Or you can buy the 1/8" stereo plug to two RCA plugs that Radio Shack has been selling for 30-40 years, plug one end into your Ipod headphone jack, and run the two RCA plugs into your Aux input. That costs about $5, and is easy as pie. An Ipod will play through any old receiver, but the USB docks will not plug into them.
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Connect this to the AUX input on the back of the 7140, and away you go. Get the lead as an accessory from just about any electronics hobby store.
no lights also how i fixed this issued
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Funny, I measured 24 Vdc, not 5.5. Radio Shack p/n 272-1154 12v 50ma Bi Pin Lamp They also have a 25ma bulb with insualted pigtails. The replacement bulbs ran for bout 2 years before I had to replace them again but for approx $4 I'm not complaining
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