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Please help with component Identification

Discussion in 'Electronic Design' started by Stan, Feb 15, 2007.

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  1. Gibbo

    Gibbo Guest


    The big red blob is *clearly* a thermistor.
     
  2. Eeyore

    Eeyore Guest

  3. Stan

    Stan Guest

    I'm 99% certain the red thinggie is not a MOV but a thermistor. It has
    markings "Sincera 8R0M", I have removed it from the PCB and at room
    temperature it has a low resistance of 8 Ohm, when hot (left on heater
    for a while) i measured it at 80 Ohm's. So..i don't think the R & Z
    designators are switched because using a "Z" designator for a
    thermistor would be very odd. I'm certain Z801 is the correct
    designator for the mystery component.
     
  4. Stan

    Stan Guest

    Do you have a datasheet or URL to find further information?
    I did a search and found a couple of TV service manuals which appear
    to use such a device but no useful information.Who manufacturers that
    component? The manual was for a Toshiba but i couldn't find the
    component on Toshiba's semiconductor site. Thanks..Stan
     
  5. Stan

    Stan Guest

    You could be right, i will look into this. Thanks
     
  6. Eeyore

    Eeyore Guest

    No question about it since you can see from the pcb layout that the thermistor is
    in series with the degausing coil which is what you'd expect !

    Graham
     
  7. Guest

    The manufacturer is General Semiconductor.
     
  8. Guest

    It's a suppressor diode made by General Semiconductor, they got bought
    out by Vishay. I doubt they make it anymore though.
     
  9. Guest

  10. Robert Baer

    Robert Baer Guest

    I agree.
    Also, the designations are bass ackwards as i mentioned; the parts
    may be correct, but the "schematic" leaves a bit to be desired.
    So, if it indeed is a thermistor (possible) then they are really
    messed up.
     
  11. Eeyore

    Eeyore Guest

    If you correct for the 'upside-down' ness of looking at the resist side, there's nothing wrong with the pcb legending at all !

    Graham
     
  12. Robert Baer

    Robert Baer Guest

    Look rather carefully; one part is close to the side of the relay and
    both leads are "within" the relay length; the other is further away and
    mostly off the "end" of the relay.
     
  13. Gibbo

    Gibbo Guest

    Eh?

    The PCB is correct.

    R803 is closest to the relay in both photos. It is shown on the solder
    side with a resistor symbol and designated below it, upside down, as
    "R803". It is designated in the closest position possible. One leg
    protrudes very slightly beyond the end of the relay. It is a thermistor.
    It is a red blob.

    Z801 is further away from the relay in both photos. It is the glass
    thing in question. It is shown on the solder side with a "tranzorb" type
    symbol and is marked as "Z801" right next to the symbol. It is within
    the length of the relay.

    I'm baffled where the confusion lies about which component is which. It
    is *very* clear to me and the PCB is correct.
     
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