How to resolve an error problem AC LOW in IFB washing

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This is an IFB Top-load washing machine control panel it has an AC low error. This is a power error that the input line has low voltage but in reality, the voltage is correct into line. 

So we will repair the PCB  fix error ac low 

Now we have to check those resistances that take signals from the input line and delivered on the main microcontroller IC. 

That kind of resistances is 100 kilo-ohms above to up and we can find easy into the circuit you are seeing in figure 2. 

There is a resistance R1 560k. This resistance is a very important play role in the circuit  R1 is a calibration resistance for line in voltages if the resistance will be increased.

 then show the error on display  AC HIGH  if the resistance value decreases then show an error on the display AC HIGH.

 

without a pressure sensor, we cannot check the PCB for all functions so we have to attach the pressure sensor with PCB. You are seeing  in figure 2


In most of the cases, R1(560K) is open. By replacing the resistance the P.C.B will be OK.


 

figure 1. top load washing machine 

figure 1.

Figure 2




figure 3



In this video, I have explained about in the detail  


                                             

                                                    https://youtu.be/kZLOhCylUow





Comments

  1. CIRCUIT ENGINEERING CO.,LTDDecember 7, 2020 at 10:35 AM

    You have a real ability to write a content that is helpful for us. Thank you for your efforts in sharing such blogs to us.PCB Board Repair Service

    ReplyDelete

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