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  1. H

    Component Identification

    Thank you, *steve*. Because I had questions about SMD components, I started looking for information covering the topic. I found this link to what appears to be very useful information covering just that. I hope it is all right to post it here. If not, let me know and I will delete (if I can)...
  2. H

    Component Identification

    Well I just found my answer. A 2x on a SMD component signifies a SOT-23 NPN transistor. A 2T is a PNP transistor with the same package. Well anyway...hopefully this will help someone else.
  3. H

    Component Identification

    Hello again everyone. I am trying to identify a component on a circuit board. I do not have and cannot find the schematic to assist, but if you can give me a reasonable probability by looking at the component, that would help. They are small. 2.7mmx1.3mm. They have three legs and are on a...
  4. H

    Resistor Value

    Wish I had seen this earlier. The PS is back in service. Two low ohm resistors (but not the one responsible for the post) and a diode were replaced and brought the unit back to life.
  5. H

    Resistor Value

    I have tried to find a schematic, but no luck on that. It would make things so much easier.
  6. H

    Resistor Value

    I removed it because I found two other low Ohm resistors on the board that were bad. This one was wedged in between a couple of coils and I couldn't test it while it was still on the board by removing one leg. My probes wouldn't get in there without contacting other stuff. The fuse is fine as...
  7. H

    auto scan fm radio problem

    I had this problem with an old AC Delco FM receiver. Although I was also only having a problem with one or two stations, the antenna was the problem. Try a different antenna before messing with anything else inside. Also, if that doesn't work and you are going to open it up, check the antenna...
  8. H

    Resistor Value

    The component (mystery as it is) is the same size as a typical 1 or 2 watt resistor. See attached pics. I just tried to find a .23 Ohm (230 mOhm) resistor and had zero luck finding that value anywhere. I also tried to find a .23 uH inductor and had the same luck. I am just going to have to...
  9. H

    Resistor Value

    OK...working on getting the photo, but one end of this is connected to the (-) pin of the bridge rectifier and the other end is, among other things, connected to the (-) side of a large filter capacitor and the source pin (#3) of a power MOSFET (13NM60N). This is a SMPS. Does that help...
  10. H

    Resistor Value

    It actually does say Rxxx. That was why I thought it was a resistor as well. But then the color codes from the chart do not compute.
  11. H

    Resistor Value

    I actually appreciate you not having done it, so I could do it myself. I did not know it was an inductor, so now it makes sense. Now if my reading of the chart is correct, it is a .23uH inductor. Thank you *steve*. Wait. Now using another chart gives me a value of 2.3uH. So now I'm...
  12. H

    Resistor Value

    OK guys. This is embarrassing, but I cannot identify the value of this resistor from the color bands. Know that before coming here (as a last resort because this should have been simple), I have tried the color charts and the internet and the phone apps, but I just can't find this one. It...
  13. H

    Switched Mode Power Supply/Switching Power Supply (SMPS)

    OK all. I have replaced all three optos, two on the main board and the one on the vertical board, and....disappointment. No luck and nothing has changed. Haaa While looking at the CM6800 IC, it appears, and it had been mentioned before (by kellys_eye), that this should be one of the...
  14. H

    Switched Mode Power Supply/Switching Power Supply (SMPS)

    Whoops. I see I spelled them "octo." :-) All of the capacitors have been replaced with the same type and size and they have also been replaced correctly. I will attempt at least partial removal of the "optos" and let you know. Prior to, I think I will do a precautionary localized...
  15. H

    Prisoner in Home - alarm system Safewatch Pro 2000 @ Stay

    For now, disconnect the battery and unplug the transformer. Unless there is an alternate power source, the keypad should also go dark. The alarm will not sound. This will remove power and turn the system completely off so your dog can go outside. Have you tried the second user code you were...
  16. H

    Switched Mode Power Supply/Switching Power Supply (SMPS)

    OK a new discovery. When testing the 12 volt side, I am not getting quite 12 vdc. It is low and jumping sporadically and constantly up and down between 10.4-11.9vdc. I understand that an octocoupler between the main components of the board and the final circuit output should act like a...
  17. H

    Switched Mode Power Supply/Switching Power Supply (SMPS)

    As I was reviewing other's posts, someone had advised that the 52 volt side was the power supply for the IR lighting (surveillance system). That side would only come on when another component (light sensitive) was activated due to darkness. If that is the case, I am wondering if, quite...
  18. H

    Switched Mode Power Supply/Switching Power Supply (SMPS)

    Thank you, kellys eye. This is the controller chip. It is a CM6800UBX. I can find it, however, not in the US. Do I have to have this exact same number? Another question. I had removed and tested the bridge rectifier earlier. It tested good at the time. While doing a closer inspection of...
  19. H

    Switched Mode Power Supply/Switching Power Supply (SMPS)

    Placing resistors across the outputs, either the 12V only, the 52 only, or both, didn't change anything.
  20. H

    Switched Mode Power Supply/Switching Power Supply (SMPS)

    On the transformer where points 3 and 4 are (bottom of main pcb), I get 166vdc. I get nothing at numbers 8-9 and nothing at the smoothing capacitor. I should get some voltage at 8-9, shouldn't I?
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