Tuesday, November 14, 2023

Why electronic protector talking long to activate protection mode.


The problem of this AC line surge protector was not starting to  give protected AC before 6 minute, something must be wrong  inside the machine since there was no diagram for this circuit  as general services first I re-solder all the joints then the most  problematics part are e -capacitors I had three on the board.

10 microfarad @50 volts

220 microfarad@25 volts

22 microfarad @ 16 volts

The value of 220 microfarad cap was changed to 200 micro and  ESR 148 ohm that was not good two others were not bad  enough by replacing the cap machine start to give voltages  after 2 minute

Article brought to you by Mr.Beh. based in Tehran City-Iran.OP AMP DBL 324

Wednesday, September 20, 2023

Ramtons Microwave oven model RM/320 with “no heating symptoms” now repaired,

I received a microwave from a customer who wanted it checked by a technician,

The complaints were the microwave was working well in terms of setting time and everything but after going through the process, It could not heat the food.

This problem from my experience it is used caused by failure in one or more components of the high voltage circuit.

These incudes, magnetron, high voltage capacitor, high voltage diode, High voltage fuse or high voltage transformer.

Friday, July 7, 2023

Test and Tag Training: Ensuring Electrical Safety in New Zealand

Electrical safety is of paramount importance in both workplaces and residential settings. Faulty electrical appliances and equipment can pose serious risks, including electric shocks, fires, and even fatalities. To mitigate these hazards, it is crucial to have a thorough understanding of test and tag procedures. Test and tag training plays a crucial role in equipping individuals with the necessary knowledge and skills to carry out these procedures effectively, ensuring electrical safety compliance and safeguarding lives and property.


Saturday, October 8, 2022

ARMCO Microwave oven came in dead now repaired!

I received this microwave from a client who wanted it checked by a technician.

Initial test indicated the machine was totally dead, I opened it and tested the power supply fuse and found it okay.

Next, I checked the control panel and found inductor L101 was open, I followed that line and noted it was feeding IC100(NK364PN) and therefore suspected it could be shorted.

Saturday, September 10, 2022


I received this home theater from a client who wanted it checked by a tech, I applied the power and noted there was no sign of life. 

I opened up the machine and proceeded to scan the whole system, beginning with the power board and later motherboard.

I noted two capacitors with top part slightly swollen on the power supply section, usually if you get a capacitor with top part swollen it is advisable to replace it directly with testing.

Thursday, July 7, 2022

32 inch Vitron Television picture upside down after motherboard replacement now fixed

I received this television from a customer who wanted it checked by a technician.

She told me that she suspect a loose cable and hence minor problem.

I checked the voltage and found they are present even on the secondary side of the power supply.

I also noted some components were getting too hot on the secondary side (Never torch components on the primary side unless if you power off and remove the power cable from the outlet) and since the power On led was off means the microprocessor was also not getting power.

I decided to do new motherboard replacement, getting these boards in my market is quite easy.

I visited the shop and I was back with one which was exactly the same and therefore I expected easy fix, plug and play.

And yes the television fired on beautifully from the back I could see backlights are on.

Turning to the screen I noted the picture/image were upside down like you can see below.