Pictorial how to: LED tuner bulbs in SX-x2x (727 used)

Discussion in 'Pioneer Audio' started by Johnny_Law, Aug 19, 2015.

  1. larryderouin

    larryderouin Turn it UP, POP? PLLUUEEEZZZZZEE Subscriber

    Messages:
    21,612
    Location:
    Glen Burnie Md.
    Other than Mark the Fixer's comments about the reverse voltage problem and flickering, I WILL have to add 1 correction.

    THE CORRECT SIZE FOR THE ALLEN SCREWS is 1.5mm not 1/16" It's a metric size and the 1/16" WILL strip the cap if it's locked in tightly.
     
    Johnny_Law likes this.

     

    Please register to disable this ad.

  2. Johnny_Law

    Johnny_Law AK Member Subscriber

    Messages:
    1,695
    Location:
    North Bay, NorCal
    Thanks Larry, good looking out. I wasn't sure which it was.

    And after much time spent looking at the lights (on the 727 used in the tutorial, and on my 828) any flickering that may exist isn't an issue at all to my eyes.
     
  3. Puddintane

    Puddintane AK Subscriber Subscriber

    Messages:
    877
    Location:
    USA
    Dadgummit! I was dinking around for the last half hour trying to get that thing loose on my SX-828. Nothing seemed to be the right size, standard or metric. Finally, it just came loose..Now that I have it off I can see that the 1.5mm does turn it. Thanks!
     
  4. jnicholson14

    jnicholson14 AK Subscriber Subscriber

    Messages:
    577
    Location:
    Louisiana
    My SX 727 lost one of the bulbs on the dial face last week. Good excuse to crack it open and give the thing a good cleaning.

    Followed Johnny's instructions. Great results. Used blue led's from Parts Express. Looks awesome.
    pio.png
     
    mkellar likes this.
  5. asciibaron

    asciibaron Member

    Messages:
    56
    Location:
    Philadelphia, PA
    are these LEDs white or blue? the link only has white, green, or red.
     
  6. jnicholson14

    jnicholson14 AK Subscriber Subscriber

    Messages:
    577
    Location:
    Louisiana

     

    Please register to disable this ad.

  7. Lugosi1931

    Lugosi1931 New Member

    Messages:
    2
    Hello-
    I realize this is an old post but I just completed this job along with changing the bulbs behind the am/fm signal and strength meters. You will need 7 bulbs total (5 for the tuner dial and 1 each for the meters). They are all fuse lights. I purchased mine as the Blue LED from Parts Express. I am guesssing they already have a resistor built in as they do not flicker from the AC voltage. To access the tuner meters bulbs on the sx 727 there are 2 phillips head screws securing for lack of a better term a metal housing. Carefully remove these 2 screws(magnetic screwdriver helps). With the unit unplugged you can reach in a grasp the metal housing behind the meters and scoot it back from the meters. You may have to move a few wires out of the way. As I pulled it back I rotated it clockwise a little and you will see the 2 bulb in the housing. These are not as easy to take out and install as the dial bulbs but it can be done. I used a small long blade screw driver to pop the bulbs out and then retreived them with a little Blue Tac on a screwdriver. To install I stuck the new bulb to the end of a long thin screwdriver again with the Blue Tac and fished it into the fuse holder clips. Once you get it into the clips you can rotate it so the led's are facing straight out of the housing. Repeat same procedure for the other meter. Rotate the housing and afix with the screws. I will try to post a picture. You almost have to change these as well as I found just doing the dial made the meters look really dull.
     
    jobrewer1983 likes this.
  8. gkhashem

    gkhashem Active Member

    Messages:
    195
    Location:
    Webster, NH
    I did eventually get the meter bulbs in. You should reconsider blue LEDs for the meters. Mine were too blue so I put in white LEDs for the meters on the second attempt. Blue is OK for the dial but wipes out the meters so they become hard to read. So it's all white or blue on dial and white on meters.
     
    rcs16 likes this.
  9. jobrewer1983

    jobrewer1983 AK Subscriber Subscriber

    Messages:
    6,470
    Location:
    San Jose, CA

    Hey Ryan,

    Its been a good while! Nice work!! Hope all is well.

    Loving the SNES as well! ;) I have all my SNES/NES games in emulator format. I converted an Original NES controller to USB. So i can use an original NES controller on my PC... Running a projector as my monitor, so having a 100 inch game screen is quite fun. Mario is a few feet tall.. have had some fun game nights!

    Oh, and still have my SX-4G's you were spot on about them, they are keepers!

    Kind Regards,
    John
     
  10. jobrewer1983

    jobrewer1983 AK Subscriber Subscriber

    Messages:
    6,470
    Location:
    San Jose, CA
    Welcome to AK Lugosi1931!
     
  11. phishterr

    phishterr New Member

    Messages:
    15
    Hey this thread is pretty old but thanks to OP as well as all who posted. I recently replaced my realistic with an sx 727. Wanted to upgrade to leds, never worked on gear myself, found this thread, now I have a great looking receiver and I didn’t F anything up. Came out great, thank you.
     

     

    Please register to disable this ad.

  12. rmunson

    rmunson console destructor

    I am girding my loins to do the needle lamp.... any recommendations would be appreciated --
    it looks like the lamp enclosure is a small metal box - do I just gently pry back the flaps with a small blade to open it up?
    Thanks for this great thread --
     
  13. Lugosi1931

    Lugosi1931 New Member

    Messages:
    2
    Hello- If you look at my previous post above you will see I outlined the meter replacement as well. Be mindful of what the original author of this thread said concerning my post. They will be very blue(I happen to like it) if you use the blue led's for the meters. He suggested warm white.
     
  14. jc339

    jc339 New Member

    Messages:
    6
    Sorry for posting twice. New and learning this forum.
     
    Last edited: Jun 13, 2018
  15. jc339

    jc339 New Member

    Messages:
    6
    Hello, I'm brand new to this forum and haven't ever posted anything. I don't know if you can help me with my issue. I own a Pioneer SX-727. I'm the original owner and have owned the unit since 1974. I think that was 44 years ago. The unit and wood case looks like new and seems to be in perfect condition. I also have the original sales receipt and owner's manual. My main issues are (1 the radio dial lights won't go on. I have checked all 5 of the fuse-type bulbs (look similar to the older car fuses) and they all pass the continuity check with my volt meter (being placed on each end of the bulb with the power OFF). After reading a post on this forum, I have also removed the bottom panel on the unit and I see the 3 fuses all mounted on a small printed circuit board with a thick plastic protector on each fuse. All 3 of these fuses also pass the continuity check and none appear to be burned out. I haven't checked for voltage with the power on because I don't want to cause a short or blow something by touching the wrong contacts. I read on this Pioneer forum that the bottom 3 fuses, the one closest to the case is the fuse for the radio dial lights. Again, this fuse appears to be good with a continuity check across the fuse with the power OFF. 2) All the indicator lights work (AM/FM/Phono/Stereo) except the Aux light appears burned out. My continuity check showed all the indicator bulbs had continuity except the Aux light (I read that some people had problems removing the indicator light bulbs due to the foam they are cased in had deteriorated. My indicator bulb foam casing is in perfect condition and all I did was gently pull on the bulb from the rear where the wires attach and the bulb came out with a little coaxing but not that really a problem. So, I'm ready to get a bulb for the Aux and solder that in place. 3) I squirted a tiny amount of electric contact spray cleaner into each push button from the front of the buttons with the front metal cover removed but I was reluctant to try and locate the switch pots from behind or inside the unit because I felt it would be better not to tamper with anything if I didn't really need to. I did notice a tiny bit of scratch noise through the speakers when pressing one or two of the front panel buttons and the tiny amount of spray inserted from the front seemed to help, but all buttons seem to be functioning well as do the selector switches, volume, tone, etc. Those are my issues. The main one is the radio dial lights not going on as described above. I can live with the radio dial lights not going on but it would be nice to have them working to see the radio stations. Any assistance is appreciated.
     
  16. ivandezande

    ivandezande Super Member

    Messages:
    1,409
    Location:
    Twin Cities
    Really should start a new thread and not post twice....
    Take off the bottom and DeOxit everything, going through the front really won't do much. The meter lights are switched by the function knob, so that could be your issue.
     

     

    Please register to disable this ad.

  17. jc339

    jc339 New Member

    Messages:
    6
    Thanks for your help. Sorry about adding to this thread. This is my first post to a forum and I am still figuring it out. I posted twice by mistake. I see what you are saying about the function knob that also turns on the dial lights. I'll try and spray all the switches if I can get to them with the bottom panel removed. I think you're saying that the function switch may not be turning on the lights due to some oxidation or such on the circuit that turns the dial lights on, even though none of the bulbs or fuses appear bad. Can I use electrical contact cleaner as I don't have any DeOxit?
     
  18. ivandezande

    ivandezande Super Member

    Messages:
    1,409
    Location:
    Twin Cities
    Yup exactly. As long as the contact clean removes oxidation, I'm sure it'll work fine. Good luck!
     
  19. jc339

    jc339 New Member

    Messages:
    6
    Pioneer SX-727 - Original owner since 1974. Hello, I went in and deleted the previous duplicate posting. I'm not sure if I posted a new message regarding this or not. This is a very excellent forum with great helpers. I did go in to the function switches on either end of the receiver, and the the other switches and push buttons I could reach and sprayed CRC Contact Cleaner all around the switch contacts. I used a paper towel below where I sprayed to soak up the excess and tried not to get it into anything but the switch contact points. Unfortunately, the bank of 5 radio dial lights still didn't go on. The switches seemed to operate smoother so that was probably worth doing. While I was in the case, I double checked all the fuses and the dial light bulbs for continuity using my ohm meter and they all appeared to have the filament intact and there was continuity at each end of the fuse-style bulbs and the 3 actual fuses on the bottom of the unit. The main fuse that screws in the back of the unit is also good. Any other ideas are appreciated. Thanks.
     
  20. ivandezande

    ivandezande Super Member

    Messages:
    1,409
    Location:
    Twin Cities
    Check the wiring and the transformer wiring for them. It's directly connected, there's not a lot that could have gone wrong. Screen Shot 2018-06-13 at 6.00.14 PM.png
     

Share This Page