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Explosion In Desk Telephone (Part 2)

By on August 17, 2019
how to fix telephone that exploded












In part one of this article the VDR of this telephone was exploded because the owner by mistake connect the telephone line to 220 v AC out let and caused replacing of exploded VDR with a good one and also found bad solder joints in the solder side of pcb and re soldering of all the bad joints telephone returned to life. But after a month the set returned to workshop again by owner with this new compliant that dialing numbers are not working properly and need to much pressure by finger on dialing numbers when user wants to make a dialing for a telephone call.

fix telephone

This problem comes up just because of the erasing of the chemical compound   SILVER NITRAT AG NO3. that is  covered inside of push buttons this  chemical compound is very good conductive for  electricity and when someone push a number actually connect the end of the button to the pcb circuit of same number and a good conductivity connect all the circuit of pcb for that special number.

In the electronic market I found a  special pad that was made for this model of telephone dialing numbers and by installing this pad under dialing numbers  the problem solved  this new pads fundamentally repaired the telephone problem

telephone circuit board repair

telephone fix and repair

this pad specially is made for this model of panasonic telephone I installed the above pad  over the

dialing button underneath but conductive side must be face to printed circuit on the pcb

Pcb board telephone repair

telephone exploded repair

after installation of this pad over the button key  pad if one push number 2 of dialing numbers  for example  actually just pushing the conductive layer to the circuit pcb of number 2 ,and there is no need to push dialing numbers too much because there is enough conductive available to make a good contact on pcb circuit and dialing ic will satisfy to reached this much electrons this time and accept to send code number two to the telephone center, low cost repair but with great satisfaction of owner of telephone  was reached this time.

beh new

This article was prepared for you by Mr Beh from Iran

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




  1. Albert van Bemmelen

    August 17, 2019 at 3:25 pm

    Good thing that these special pads and the other parts you previously ordered are easily available in your country Beh! If the prices of these replacement parts are right the repair of these heavily used phones won't be any problem. It is a good service like the special rewiring service that exists in India for repairing defect original transformers.

    • beh

      August 18, 2019 at 8:10 am

      Albert these parts are made of IRAN not china and thanks

    • beh

      August 18, 2019 at 3:21 pm

      since the manufacturers are not giving any services to customers IN Iran like PANASONIC.. the repairers started to produce whatever they want in repair time. the addresses of the manufacturer of these parts in IRAN is available I may give to you.

  2. Parasuraman

    August 17, 2019 at 4:38 pm

    Vow! Such parts are easily available in your place! Good service and info shared!

    • beh

      August 18, 2019 at 8:14 am

      If you want i can give the name and address of producer in Iran ?

    • beh

      August 18, 2019 at 3:26 pm

      yes, I KNOW that a full series of these pads are made for any model of Panasonic telephone and is obtainable from our market and many more............

  3. Yogesh Panchal

    August 17, 2019 at 8:43 pm

    Excellent! Beh

    • beh

      August 18, 2019 at 8:18 am

      You are well come

  4. beh

    August 18, 2019 at 3:29 pm

    thank you YOGESH

  5. Justice

    August 19, 2019 at 4:14 pm

    What a tip Beh. you've just given me exactly what I need -- thank you so much. I will order these pads.

    • beh

      August 19, 2019 at 8:18 pm

      THE GOLDSMITH KNOWS THE PRICE OF GOLD . you realized what i have shown in this article yes millions of telephones are waiting in the world to receive such services and thanks for your justice.

  6. Robert Calk Jr.

    August 20, 2019 at 4:43 am

    Good job, Beh!

    • beh

      August 20, 2019 at 3:53 pm

      so far I have sent several articles about major problems in desk telephone and I hope any member of this weblog can handle the problem of a desk telephone by referring to these articles. I am trying to replace unknown smd transistors of a telephone motherboard and I will send this article if I complete this job and thank you so much for your continued support of my articles. cheers ...............beh

      • Robert Calk Jr.

        August 21, 2019 at 12:13 pm

        I hope that you get the transistors figured out. I am glad that I have my Peak Atlas DCA75 Pro for times like that.

  7. beh

    August 21, 2019 at 6:04 pm

    ROBERT I have the same ATLAS DC75 . do think that can help me?

    • Robert Calk Jr.

      August 31, 2019 at 5:59 pm

      Hi Beh. It might can help you. If you don't have a SOT23 component holder maybe you can solder some little wires onto the pins.
      Or just use your VOM(with X10K) to find out what kind of transistors they are and what the pinout is. Do you have Mr. Yong's e-book on testing electronic components?

  8. Francisco Rica

    August 23, 2019 at 12:36 am

    Good job Mr Beh.

    Your repair work remember me the repair works of TV remote controls. With the pass of the time the chemical compound of the push buttons use to remove. I repair this problem using the metallic paper that wraps up the pack of cigarettes. This paper are for one side metallic (and so conductive). For the other side are normal paper, that allow us use glue. Cutting a small piace of paper and stick it to the push button.

    We could use aluminium paper those used in the cook but it is difficult to stick them .

  9. beh

    August 26, 2019 at 6:49 pm

    You are welcome RICA
    Yes all above methods that you mentioned were practical for remote controls but this method that i showed in the article fundamentally solve the problem of telephones with a very low cost of money and will long last. I also can mention the silver ink pens that can do same jobs but they are very expensive.


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