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NAD 5340 CD player 1988. No Display

This CD player's audio is fully functional and sounds great. However, there is a small function-display on the front that tells you which track you are playing. It does not light up. I have an oscilloscope, a good digital meter, a small analogue meter, and experience repairing various electronics, however, I have no schematic diagram for this unit. Can someone supply a schematic or a service manual? Or does anyone know if this is a known common fault? So far, I've eyeballed the electronics, and there are no signs of burns, popped caps or loose connections. I haven't placed a measurement yet. The display driver chip is NEC D75P308GF and written on the board is TK-T134 94V-O I can't find a spec sheet for this chip. If someone finds a description of the pinouts it would help. Thanks!

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  • IamSpOOk Sep 22, 2007

    Fixed it. Pull off the front panel. Undo the screws, careful not to let the buttons fall out. unsolder all of the display leads and pull the display away to reveal a cowl with a red filter. Slide the cowl to one side and pull it away to reveal two small light bulbs. Replace each light bulb with a pc-mount bright white LED in series with a 1/4 watt 150 ohm resistor. Negative 5v is in the middle of the board. Mount the resistor vertically and leave some slack in the leads. Then sand off the shiny surface of the LED to make the light diffract a little. Put a layer of grease-proof paper inside the cowl to spread the light a little more. Test the LEDs and reassemble the display by soldering the leads back in. Examine solder joints under a magnifying glass to check for shorts and dry joints. Scrape away solder flux, clean with toothbrush and isopropyl alcohol. Test and reassemble.

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SOURCE: Laser unit NAD 5100 Monitor Series

Hey, I think you can bye new laser here http://www.pltv.org.uk/laser.htm I have a nad 5300 monitor series, same laser as 5100, you can buy the hole cd player from http://www.miguelovitch.dk Laser work, but problems with cd transport. When i 'help' the cd transport, cd play as expected. And i agree, it is a nice cd player, also i have heard lot of nad cds on quad 405, sounds realy good. Try to visit my site, i also have a lot of free schematic for nad, denon, quad and mora. Also repair notes for amplifiers, tech videos, diy schematics and more.. Also at this moment i am working on a new 'nad cd service movie) including cleaning, maintenance, repair and more on nad 522, 501, 502 c521 and more see you best regards michael miguelovitch http://www.miguelovitch.dk

Posted on Sep 27, 2007

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SOURCE: NAD 502 CD player LCD problem

hey, well, typical problem i nad cd players, and also receivers by the way. The proble are tha nad use standard glow lamps. And as we know, the blow!! And often when you move around with the cd. Well i do have repair note for this one also. http://www.miguelovitch.dk/ go to the menu: 'amplifier repair notes' (yes includes cd players ;) ) Here you can find free amplifier repair notes, an go fore nad 705 repair fix (same fault with defect bulb's as in you nad cd) And also a technical repair movie showing you the hole process of the 'workaround' this fault i NAD 522 (NAD 501, 502, 512 and more) http://freemovies.s-educator.org/repair_movies/nad/nad_cdplayers_defect_lamp_in_display_stremingvideo.html best regards michael miguelovitch

Posted on Sep 27, 2007

robotek
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SOURCE: NAD 5425 CD Player display light out

Hi aartman

Yes it does have backlamps.

They are soldered to the PCB so you will need a few tools like a soldering iron, philips screwdrivers, solder, and some replacement lamps. Replace the lamps with this type from Farnell electronics. They have a 15000 hr life expectancy and last alot longer in the unit. I have tried many types of lamps over the years, and found these are the best choice if you want them to last.

FOR YOUR SAFETY-BE SURE TO DISCONNECT FROM THE MAINS BEFORE REMOVING THE LID

To get access to the lamps, you need to pull the main PCB out of the chassis to then get access to the bottom side of the printed circuit board where the 2 screws that retain the white lamp reflector assembly. Change both lamps with the type I mentioned,
6ab9edb.jpg Be careful not to flex the LCD display that is now exposed, it is quite fragile with the support of the lamp reflector cover no longer in place. ... reverse procedure to reassemble and away you go.

I am more than happy to talk about this solution with you further. Just ask away. Cheers

regards
robotek

Posted on Dec 12, 2008

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SOURCE: Hannspree HF259H Audio (sound) Problem

I connected an audio cable from my sound card to the audio unput on the monitor and the monitor plays everything as well as my other speakers connected to my sound card. I have a Diamond multimedia sound card (7.1 setting) By the way, the monitor speakers sound "tinny" if the volume setting on the monitor is too high.

Posted on Jan 23, 2009

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SOURCE: NAD C541i CD Player won't turn on

I recently bought a second hand C541i as is and I had the same thing; no power up. I took it to a service centre, they re-soldered the connecting pins for the transformer socket. It now works well.
After that I realised that it could have been the problem with the Burson Audio clock that was installed buy the previous owner but had intermittent playback problems. A study of the schematic revealed that the +12v rail for the clock, is from a different secondary coil winding than the +5v for the DAC etc. And the -12v for the analogue output stage could be from a different pin on the connector as well.

I hope this helps.

Posted on Mar 03, 2009

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