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GEDEME Fridge Protection Repaired

By on May 30, 2016
GEDEME Fridge protection repaired










This Fridge Protector brand GEDEME (Cuba made) Model 010A was brought to me by a fellow worker with the complaint of always in Low (Bajo) voltage, even if the voltage in the AC line was ok.

GEDEME Fridge Protection Repaired

First thing done was to dismantle the box by unscrewing four screws.

open ac protector

The PCB was de-soldered from the In and Out voltage cables and unscrewed from the plastic box, only two screws this time.

ac protector repair

First thing done was to check on the capacitor in the AC-IN.

capacitor tester

As you can see in the photo above, its value is 225J (similar to 2200nF) and as you can see the result given by my capacitor meter was ok.

Secondly the transistors (BC337 and BC 327) and the rectifiers diodes were checked with the DMM (Digital Multi Meter), the result?

  • The transistor BC337 had leakage between Emitter and Collector junctions.
  • Three of the four diodes (1N4007) had leakage too.

I decided to replace both transistors for similar ones. The four diodes were replaced too.

Note: If I only replace three diodes, I’m afraid the remaining one will breakdown soon. So replacing all the diodes will avoid call back.

bad diodes

When the new components were soldered into the circuit, it was tested in the AC-Mains and look at the result.

ac protector repaired

Now it’s time to check on the AC output voltage (V out) to make sure the Relay is working fine too.

ac voltage testing

As you can see in the above photo, 119.7 vac output was measured. Mission accomplished.


This article was prepared for you by Humberto Rodriguez, one of our ‘Master Authors’ from Cuba

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Note: You may check his previous repair article in the below link:




  1. Parasuraman S

    May 30, 2016 at 10:31 pm

    Great! It was very experienced of you to have replaced all the 'future' defective components as well!

    • Humberto

      May 30, 2016 at 11:52 pm

      Thanks Parasuraman S, that action of changing the future' defective components as well is convinient

  2. Kybosh

    May 30, 2016 at 11:26 pm

    The unit has a wait state of a few minutes after power up.... is that known to be normal?

    • Humberto

      May 30, 2016 at 11:55 pm

      , it's a time among 3 to 5 minutes, at this time the AC-line voltage must be stabilized.

    • Paris Azis

      June 4, 2016 at 7:49 pm

      Hello Kybosh,

      (Hopefully Humberto allows my intervention, again)!!..You will find another complementary answer in my article, below, published in this blog.


  3. james Mao

    May 31, 2016 at 8:16 am

    Why does the unit needs a few minutes to power up
    (Return back to normal working condition)?
    Nor a few seconds? Please let me know. Thanks

    • Humberto

      June 1, 2016 at 12:51 am

      Yes james, it's a time among 3 and 5 minutes to protect the equipment connected to the protector. Why? Because in this time (3 to 5 minutes) the electric or electronics device is not receiving AC from the line. Remember when a blackout occurs, and the AC line is established again, there could be transients, low/high voltages with spikes, and etc., etc.; and all this time (3 to 5 min.) the protector is not supplying AC to the device connected to it. On the other hand, if AC voltage rises/or is low; then the protector interrupts the AC supply to the device connected to it. As you can see, it's only function is to protect the whole time.

    • jose

      May 20, 2022 at 9:03 pm

      Dear James, the correct answer has realtion with the protector function. As you can see this device is "Para equipos de Refrigeración" --> for refrigeration equipment. Those equips have a compresor and it increase the pressure during the refrigeration process. When the power supply has any foult (high voltage, low voltage or cut off) the protection disconnect the supply to the equip connected to it. in this moment the pressure could be to high in the compressor discharge. So, if you don´t have this time delay (3 to 5 min) and the power change its condition to NORMAL, the equip will receive the start signal but it can start becouse the pressure is too high. Then, this time is for to protect the equip while the pressure goes down in the discharge of the compressor.

  4. beh

    May 31, 2016 at 6:52 pm

    yes indeed is a useful article and repair report i know million of this machine is giving service to people and this would be very helpful for all thanks HUMBERTO.

    • Humberto

      June 1, 2016 at 12:13 am

      Thanks beh, you are 100% right. Have a good day.

  5. Robert Calk

    May 31, 2016 at 11:53 pm

    Good job, Humberto.

    • Humberto

      June 1, 2016 at 7:48 pm

      Thanks robert, I did my best.

  6. albert van bemmelen

    June 1, 2016 at 5:57 am

    Thanks Humberto. I have seen you repair such devices before and replacing these by standard npn/pnp type transistors is tricky. Because the BC337/BC327 are made for stronger currents (~800 mA). And from Paris I understand you also have a schematic from this device? It would be interesting to have a look at.

    I ask because we in our Country do not have these AC input controllers. Thanks!

  7. suranga bandara, Suranga Electronics

    June 1, 2016 at 7:50 pm


    Very good Repair !

    Thanks For This.

  8. Humberto

    June 1, 2016 at 8:01 pm

    No Albert, I do not have the schematic of this specific device. I've repaired some of them and most of the times the malfunction is located in the same section of the circuit.
    I sent some photos of one of this device to Paris by means of Jestine Yong.
    Have a good day.

    • albert van bemmelen

      June 2, 2016 at 11:03 pm

      Understood Humberto. It shouldn't be hard to make the schematic or even to build one just like the original from the Photos you have.
      I could try to destillate a schematic from that information Reverse Technology wise. If I remembered it well it also uses a Relay to switch on the AC Line.
      Anyway you do have my e-mailaddress.

    • Paris Azis

      June 4, 2016 at 7:53 pm

      Hi Humberto

      I want you to know that I received your message and the photos attached to it. I just don't know if you have received my answer. Anyway, thank you and Jestine once again!

      • Humberto

        June 6, 2016 at 10:01 pm

        Hi Paris, first of all, you have to forgive me in my delay of sending to you the photos; in fact, I was abroad at that time (out of my country).

        • Paris Azis

          June 7, 2016 at 4:50 pm

          No problem Humberto. I was informed about that from Albert.

          Thanks again!

  9. maurice chidawe

    June 2, 2016 at 4:15 am

    big up. i followed the way you have repaire the fridge guard. thanks

    • Humberto

      June 6, 2016 at 10:02 pm

      Thanks maurice, I'll keep up sharing my expertises.

  10. Chris

    June 3, 2016 at 6:38 am

    Congratulation Humberto!
    This is an interesting article for me, because in my country are still no device like this and I would also get a look to the schematic.
    As I figured out ou have no schematic for, if you got one in some time please let as know...
    Great job done, another successfully repairing.
    My best regards and keep up!

    • Humberto

      June 6, 2016 at 10:29 pm

      Thanks Chris, I do not have any Schematics, but when I have another one to repair I will try to draw the Schematics by means of Reverse Technology wise method.

  11. Yogesh Panchal

    June 3, 2016 at 4:19 pm

    Good Job! Humberto.

    • Humberto

      June 6, 2016 at 10:30 pm

      Thanks Yogesh. I'll continue sharing my experiencies.

  12. Paris Azis

    June 4, 2016 at 7:40 pm

    Interesting repair Humberto. It seems that you became an expert in repairing these devices.

    Best Regards

    • Humberto

      June 6, 2016 at 10:47 pm

      Thanks Paris. I have repaired some of them. In my country the season is summer at this moment; and it's common to rain a lot, so there are many lightnings that affect the aereal electric line, and then many of these devices get out of order.

  13. Amir Mukhtar

    June 6, 2016 at 12:49 pm

    Thank you Mr. Humberto Rodriguez for sharing experiences and expert knowledge for Learners.

    Keep Sharing and Take care too.

    Thanks you again
    Amir Mukhtar Ashrafi
    Karachi .PK

  14. Humberto

    June 6, 2016 at 10:49 pm

    Thanks for your comment Amir. I'll keep up


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