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Sencor SVC7020BK robot vacuum cleaner problem

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    #21
    Re: Sencor SVC7020BK robot vacuum cleaner problem

    q21 may be partially shorted,
    the base shouldnt draw enough current to heat a resistor

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      #22
      Re: Sencor SVC7020BK robot vacuum cleaner problem

      It still gets hot after replacing Q21, but thank you for all the knowledge and tips really appreciate it I will try to figure it out what's going on when i will have some spare time. At charging and why it stops driving.
      Last edited by Awesomerp; 09-26-2022, 02:21 PM.

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        #23
        Re: Sencor SVC7020BK robot vacuum cleaner problem

        As I understand the main objective of IC4 is when the positive inputs are higher than negative inputs, to provide an output of whatever voltage is on a pin8 which(vcc+) and step it down with 100k resistor to 5V? And if the negative input is higher than positive the signal will go to Pin 4 ground?
        But I don't really quite understand why there has to be 2 op amps in this comparator. Also do voltages of both of the outputs add up and then are being converted to 5V through a 100k resistor?
        Attached Files
        Last edited by Awesomerp; 09-27-2022, 06:25 AM.

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          #24
          Re: Sencor SVC7020BK robot vacuum cleaner problem

          the comparaters are active-low
          if either trips then the mcu thinks there is a fault with either the 8.3v or the battery voltage.
          if both voltages are u.k. then the output should be high because of r1

          if the output is low then either one of those resistors in the divider circuits is bad or the chip is bad.
          those chips can slowly drift out of spec which is why i pointed it out some posts back.

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            #25
            Re: Sencor SVC7020BK robot vacuum cleaner problem

            thank you

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              #26
              Re: Sencor SVC7020BK robot vacuum cleaner problem

              Originally posted by Awesomerp View Post
              thank you
              I would also recommend changing the LM393 as well for the same reason as what STJ mentioned earlier
              9 PC LCD Monitor
              6 LCD Flat Screen TV
              30 Desk Top Switching Power Supply
              10 Battery Charger Switching Power Supply for Power Tool
              6 18v Lithium Battery Power Boards for Tool Battery Packs
              1 XBox 360 Switching Power Supply and M Board
              25 Servo Drives 220/460 3 Phase
              6 De-soldering Station Switching Power Supply 1 Power Supply
              1 Dell Mother Board
              15 Computer Power Supply
              1 HP Printer Supply & Control Board * lighting finished it *


              These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

              1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
              2 Hem Saw Computer Stack Board

              All of these had CAPs POOF
              All of the mosfet that are taken out by bad caps

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                #27
                Re: Sencor SVC7020BK robot vacuum cleaner problem

                thanx!

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                  #28
                  Re: Sencor SVC7020BK robot vacuum cleaner problem

                  Could someone help me to identify what these codes mean below LM393 part.
                  "78K"
                  "D83D G4"
                  Maybe there is a website where I could find the datasheet of this exact one and see the specs of it to choose a similar one to buy.
                  Or is it enough to choose the same pin out and size one?
                  Attached Files
                  Last edited by Awesomerp; 10-01-2022, 10:15 AM.

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                    #29
                    Re: Sencor SVC7020BK robot vacuum cleaner problem

                    they mean nothing,
                    it's production tracking data

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                      #30
                      Re: Sencor SVC7020BK robot vacuum cleaner problem

                      I see, well ill use size and pin outs to determine the similar one then.

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                        #31
                        Re: Sencor SVC7020BK robot vacuum cleaner problem

                        it's probably an SOIC package

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