Announcement

Collapse
No announcement yet.

Lorenz Pulse 5 - blown transistor

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Lorenz Pulse 5 - blown transistor

    Hello, the coil driving transistor in my Lorenz Pulse 5 blew. Unfortunately, the labels of all ICs and transistors are scratched. Does anyone has an idea what this transistor could be?

    Here are some pictures:

    http://prikachi.com/images/93/4772093K.jpg
    http://prikachi.com/images/94/4772094K.jpg
    http://prikachi.com/images/96/4772096A.jpg
    http://prikachi.com/images/97/4772097z.jpg

  • #2
    Wow, flames, not just smoke! Can you clean it up enough to trace out the drive circuitry to the transistor? This will tell you whether it's a bipolar or MOS, and whether N or P. Then, pick a replacement with high current and high voltage, then heat sink it.

    Comment


    • #3
      Thanks for the reply Carl. I am not into electronics, but here is some info which I copied from this thread: http://174.132.129.189/~moreland/for...d.php?p=136637

      http://prikachi.com/images/64/4775064E.jpg
      http://prikachi.com/images/65/4775065w.jpg
      http://prikachi.com/images/66/4775066r.jpg
      http://prikachi.com/images/67/4775067C.jpg

      Does this give enough information?

      Comment


      • #4
        Looks like you have all the info you need to trace out a schematic. Sorry, that's your job, I have no available time.

        Comment


        • #5
          No problem. Thanks for the help.

          Comment


          • #6
            Does this give enough information?

            no. you have to find a man with the Lorenz and a characteriograph. he can give you unambiguous info. it may be IGBT transistor too.

            Comment


            • #7
              That sounds like a really hard task. I am not into electronics and don't know how to trace out a schematic. And I don't know of anyone who has this detector. If someone has figured out the type of this trasistor and wants to chime in - great. Until then, I will have to forget about it.

              Comment


              • #8
                much people wishes to help you. but they want to get info in return too. that is same price for their work and kinda an equivalent. the forum exists to find and share the info, no another sources. if you do nothing you will get nothing. if you will do your Home Work as you can there will be a people ready draw the schematic and you will get the answer. if you wish only to get the answer and go out the people will not see the full Lorenz Pulse 5 schematic they dream getting of. they see now - they have a chance because you have Lorenz in your hands opened.

                Comment


                • #9
                  That's a bit vague. What info should I send in return and what is my homework? Like I said, I don't have the knowledge to trace out a schematic.

                  It is not a big deal for me as I don't use this MD often anyway.

                  Comment


                  • #10
                    The plate looks if somebody inversely connected the battery. This can mean troubles. You must check T2 (fast PNP transistor). To check it is necessary also diodes D7, D8, D9 (1N5822) and the transistor T3 (2SK2545) in the power supply circuit. It is visible that burnt up the diode D15 (BY550) and the power transistor T1. You can replace him IRFP460. If did not get damaged the bottom plate (flooded with the resin) the detector will surrender to save.
                    Mrand

                    Comment


                    • #11
                      Originally posted by AlexP View Post
                      Hello, the coil driving transistor in my Lorenz Pulse 5 blew. Unfortunately, the labels of all ICs and transistors are scratched. Does anyone has an idea what this transistor could be?
                      From the extent of the damage, it's highly likely that several other components will need replacing as well.

                      Comment


                      • #12
                        Photoes show that there is no great harm. The check and the exchange of several elements should help. The repair should however carry out the professional service. Mrand

                        Comment


                        • #13
                          That's great help. Thanks. I will replace the power transistor and the diode next to it and see what happens. If it works out - good, if not - not a big deal. I almost don't use this MD. It works great with the 1m x 1m coil and not so great with the small coils. I am mostly a beach hunter.

                          The damage was because of a bad coil cable. The wires inside the coil cable touched. I noticed that afterwards. Before I removed the transistor, the detector would turn on normally, but would not detect metal.

                          Comment


                          • #14
                            I checked the diodes that Mrand mentioned and they were OK. so I only replaced the big transistor. The detector now seems to be working like it worked before the damage. It detects metal just fine. The big transistor gets hot very slightly. The only problem I have with it now is that it doesn't switch off when I put the mode switch in the OFF position and the only way to turn it off is to disconnect the coil - similar to the Lorenz LPX2 MD. Any ideas? I don't think it is the mode switch as it doesn't turn off even if I disconnect the multiwire flat cable from the front panel to the upper PCB.

                            Comment


                            • #15
                              Probably is the damaged (short circuit) transistor T3 (2SK2545 or the equivalent). He switches on and off the voltage for the circuit.
                              Mrand

                              Comment

                              Working...
                              X