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  1. bushtech

    Comedy Thread

    Just needs a fire detector and a sprinkler attached and it's a for away:eek:
  2. bushtech

    My next project? What do you think?

    Feel for you, also in the boondocks, nothing is just around the corner
  3. bushtech

    My next project? What do you think?

    "That seems to be fairly difficult to get here"= ? http://www.corrosionx.com.au/storelocator/ The first line of the directions seem to imply a remover, haven't tried it myself
  4. bushtech

    My next project? What do you think?

    I would start with something like CorrosionX Just a suggestion. I'm no expert, so use at your own risk
  5. bushtech

    My next project? What do you think?

    Chemical rust remover?
  6. bushtech

    Can I pour 99% isopropyl alcohol onto my light socket contacts? Safe?

    Apologies for the ot. Thanks duke37, learnt something new today re inflammable
  7. bushtech

    CTEK MXS 3.8 repair

    @73's de Edd Been checking the complimentary (A6W & 2F) pair of transistors in situ These are smd transistors in which I have assumed a pinout as follows: c b e Please tell me if this is wrong in which case all below is rubbish 2F transistor Red probe on base: b - c...
  8. bushtech

    CTEK MXS 3.8 repair

    @73's de Edd I am trying to understand how this works. Does a signal/voltage from pin 5 (Drv) on the NCP1271A go through the 2 transistors A6W and 2F and then go to the Gate of the 04N60C3? I am reading 21mV DC on pin 5 (Drv) Do I need a higher voltage here?
  9. bushtech

    CTEK MXS 3.8 repair

    Remeasured the voltage carefully on the gate of the 04N60C3 and it's in the high 80's mV
  10. bushtech

    CTEK MXS 3.8 repair

    Wow! Way above my pay grade and NSA clearance:rolleyes: Impressed!
  11. bushtech

    CTEK MXS 3.8 repair

    I have nearly finished the LTSpice simulation. Still some components at the top of the board to do. So I decided to start taking some voltages on the board. Voltages are shown in dotted rectangles.As can be seen on the simulation voltage on big C5 cap fine (331V) But when I go to the next...
  12. bushtech

    CTEK MXS 3.8 repair

    @73's de Edd I have attached a portion of my LTSpice file showing relation between NCP1271 and the 2 driver transistors. No guarantees that is correct. Helluva job creating the LTSpice simulation for the CTEK
  13. bushtech

    CTEK MXS 3.8 repair

    Thanks St. Edd Yes, it is still the original 1271. I am trying to find correlation between your application note and my board's reality. Three posts up is a photo with a red arrow pointing to the blown resistor. Now, is that a 152 resistor or a 251 resistor? If I measure the unblown identical...
  14. bushtech

    CTEK MXS 3.8 repair

    I replaced the 04N60C3 fet and the blown 1.5k resistor. Readings I'm getting now: (All relative to neg of big cap) Voltage on big cap: 336V DC 04N60C3: g: 0V d: Jumping around in the 200, 300V DC s: 0V NCP1271 (7 leg chip) 1 0V 2 0V 3 0V 4 0V 5 0V 6 14V Vcc...
  15. bushtech

    Best soldering technique to prevent component heating?

    You don't mention flux, you are using flux?
  16. bushtech

    My brand new oscilloscope

    lol. Here's hoping that your magic smoke retention powers work
  17. bushtech

    My brand new oscilloscope

    But I like the the black and red ends. Much less likely to have a blonde moment when installing.
  18. bushtech

    A merry Christmas and a happy New Year to everyone

    May you all have 365 magic smoke free days:)
  19. bushtech

    Recapping pc motherboards.

    And use flux often
  20. bushtech

    CTEK MXS 3.8 repair

    St Edd I found another forum post where you describe the usage of the AM Radio and tried it. Couldn't hear anything above the crackling of the AM radio no matter how I rotated it. I had previously measured voltages on the NCP1271 FB pin 2 = 3.6V Vcc pin 6 = 9V HV pin8 = 328V No reading on the...
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