Question about Sony CFD-ZW755 Radio/Cassette/CD Boombox

2 Answers

Radio plays with batteries but when power cord is used the display says check battery.

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  • Terry Holmes May 29, 2011

    I called Sony and they had me do that too. It still says check battery.

  • Terry Holmes May 29, 2011

    Sony mentioned nothing about reprogramming anything. The only thing they mentioned was a replacement for about $80 plus shipping. When done I could get a new one cheaper. That is not a good fix. What mechanism needs to be reprogrammed? Mechanisms are mechanical not electrical.

  • Terry Holmes May 29, 2011

    It's five years old. My daughter was running a CD and it quit. She thought it was completed so she pushed the radio button and it displayed "check battery". So unless I can fix the part that tells the unit to play the radio using house current we will have to throw it away. Anything else would cost to much.

  • Terry Holmes May 30, 2011

    The radio was purchased new by my daughter's school five years ago. She teaches LD kids and was playing a CD for her class. when it finished she put in the second CD and got the message "check battery. There were never batteries ever in the radio.

    Her Information Services guy told her to take it home and put the three AA and six D batteries in the box. After doing so the radio worked without the cord. When the cord was put in it again said "check battery". The batteries have been out again over night and again it displayed the message "check battery". I just finished doing it again and this time the display showed
    "- - : - -" no sound no nothing.

  • Terry Holmes May 30, 2011

    Nothing was spilled; the box is immaculate. The cord is like new; no shorts, no burns. I have opened the box and removed the switching unit with the transformer and it looks perfect. All the diodes are on the board are ok.

  • Terry Holmes May 30, 2011

    I have a Gardner Bender GDT-11 multimeter. I don't capacitor checking capability though. All solder joint look good. How do you attach a photo if need be?

  • Terry Holmes May 30, 2011

    And there are no split parts, loose wires, black spots.

  • Terry Holmes May 30, 2011

    The cord registers .5 ohms on both sides. Dropped to this value relatively quickly.

    Looks like I only have capability to change the size of the writing box.

  • Terry Holmes May 30, 2011

    Since there were never batteries in the radio before this message came on the first time it is like new inside.

  • Terry Holmes May 30, 2011

    Recall that the box was always used with the power cord never with batteries. Only after the message did batteries ever get put into the box.

  • Terry Holmes May 30, 2011

    There are seven diodes, a fuse, and 6 capacitors. The capacitors are all the same 223K's (.022 micro-farads). None of them has over heated. The diodes are ok. If I have to unsolder the capacitors to check them it will have to wait until tomorrow. We have to meet our appointment at five o'clock.

  • Terry Holmes May 30, 2011

    The fuse was the first thing I checked.

  • Terry Holmes May 31, 2011

    I was thinking about this over night and I have concluded that it is inappropriate to start unsoldering components to check them at this time. Why aren't we checking the voltage at the five pin connector on the power board first?http://esi.sony.ca/esupport/esupport/CD%...

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2 Answers

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  • Sony Master
  • 3,018 Answers

  • Unplug the unit and remove the batteries and wait for 2 full minutes. Then using the cord only and leaving the batteries out, plug it in and see it the unit works properly.
  • This is a test I am having you do. So if it does not fix your problem then just leave a comment as to your findings and I will respond.

Regards, Tont

Posted on May 30, 2011

  • 8 more comments 
  • Iron
    Iron May 30, 2011

    She used this at a school you say? Did anything get spilled on the stereo at all? Even just a little? Can you inspect the power cord used for the socket to feed power to the stereo? Tell me if there are any cracks or rips and look at the end of the tip and tell me if it is burnt (the metal contacts on the very very tip of the end of the cord) If it works with the batteries but messing up with the cord then this has to do with the cord or the circuitry used from the cord power feed. The smaller batteries are for memory and the bigger batteries are for the actual powering of the stereo.


    Tony

  • Iron
    Iron May 30, 2011





    • If a diode was bad it would probably throw the breaker. The transformer not melted so that's a good sign. Do you see any loose wires by ac power feed on the circuit board? Do you see any electric components split? Any cold soldier joints on the board? Any black spots? Do you have a multi meter? If the cord is good, and their are no cold soldier joints and no split parts then it's time to start pulling and testing electrical components.



    Tony

  • Iron
    Iron May 30, 2011





    • You can sort of check capacitors with a multi meter. True a capacitance meter will tell you the capacitance but you can test for short, open, leaky and functioning with a multi meter. Capacitors store some good energy. Exorcise caution when fooling with them.

    • Remember this is AC no DC the unit must remain off the power feed until back together.

    • As for up loading pics, from your end I am not sure, on my end there is a little are at the bottom of where I am typing fro "links, pictures and You Tube upload." You click the word "picture" and then choose from where on your pc.

    • How does that power cord test with the multi meter? Throw the meter on ohms and test from one plug end to the same side on the end where it plugs into the radio. Test both and tell me the readings. Also, not if it goes up and then drops right away please.

    Tony

  • Iron
    Iron May 30, 2011





    • If you have a photo bucket you can just link me to a pic if you upload it there. Just an idea. In looking at the manual for this stereo it does not indicate anything for the "check batteries" but to check the batteries. Is there any corrosion around the terminals? How about on the inside of the radio in that area? As I think here, cord looks good, only ever used batteries, says check batteries. It's like something in the battery area is effecting the other power feed or the general function of the radio when not using the batteries. By a short or something is effecting that area. How does the battery area look? The board by the battery case?



    Regards,

    Tony

  • Iron
    Iron May 30, 2011





    • OK, so you want to pull the parts around the AC power feed, where the cord plugs in, and check them. You have a diode check at the bottom of your multi meter. Polarity should read one way only and not the other. Resistors will read on ohms. Capacitors read through the ohm side of a multi meter.



    Tony

  • Iron
    Iron May 30, 2011

    To test capacitors they must come clean out. And the other components 1 leg must be removed but I prefer to completely remove each part and re-solder so as not to break a leg. Pay attention to how the components are in before removing. While resistors can go in either way, the other components can't

    Tony

  • Iron
    Iron May 30, 2011





    • Capacitors can give false readings if not un-soldiered. Did you check the fuse by chance? If all checks good in that area you will need to move on to the rest of the board. 1 piece at a time. Something is malfunctioning in there and a piece at a time is how I would have to do it if it were here in front of me as well.



    Regards,

    Tony

  • Iron
    Iron May 30, 2011

    I kind of figured but I have to ask.

    Tony

  • Iron
    Iron May 30, 2011





    • Without the schematic or radio in front of me I can't see the layout of the radio so I have to mention anything that comes to mind. I don't want to miss something simple after having the radio in pieces. Some tend to think I am overly thorough but I don't think there is such a case. If I should suggest something that seems silly please understand I have seen it all in my day and I just don't want to leave any stoned un-turned. But I will help you get the stereo running. It is fortunate you can use a multi-meter as many don't and then it's really difficult if not impossible to aid in an internet repair. I am on every day from 1400 to 0200 hrs.



    Regards,

    Tony

  • Iron
    Iron May 30, 2011

    1400-0200 central time USA.

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  • Master
  • 1,196 Answers

Hi,

Connect the power cord to the radio without the batteries inside, i mean remove the batteries from the radio, and see what it will display.

Posted on May 29, 2011

  • Ishola Olayemi May 29, 2011

    Good, This shows the mechanism on the radio are not well programmed, there is factory defect on the mechanism, i will advice you take it back to them to help re-program the mechanism.

  • Ishola Olayemi May 29, 2011

    Of course i know, mechanism are mechanical, what i mean is that, the battery slot might be having partial contact with the electrical power cord parts, which makes it display, check battery. are you out of warranty? If not, let them fix it on this basis.

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