Comments on: Wasting Time Checking Electronic Components?

By: admin

admin — Mon, 09 May 2011 19:34:29 +0000

HI Wahab,

In that kind of situation we really need a schematic and without it will be hard to locate the value. We need the circuit to understand how this firing supply via relay work.

Jestine

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By: Wahab

Wahab — Sat, 07 May 2011 19:00:04 +0000

Hi, I was working on a faulty AVR of my diesel Generator. Some of its components leads were wasted due to rust and its stud diode and thyristor found shorted. I replaced all defective components and tried. Its Thyristor bowed again. On further checks one of Zener leads found broken due to rust and the nearest resistor also found overheated. This Zener is supplying to a UJT used for firing circuit of thyristor via a pulse transformer. Now I need to now
1. What could be the voltage rating of Zener.
2. What is the use of a second firing supply via a relay.
Your kind help may resolve my circuit problem.

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By: beh

beh — Wed, 20 Apr 2011 21:44:40 +0000

miller
ok yes as i told you it was battry i am happy you fixed your blue ring
and it work for you again
beh

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By: admin

admin — Wed, 20 Apr 2011 19:56:56 +0000

HI Waleed,

The right word is Investment. I wrote that post because i do not want the beginners to thinks that if it can't locate the fault it will be a waste of time to them. I want them to think the positive side.

Jestine

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By: Waleed Rishmawi

Waleed Rishmawi — Wed, 20 Apr 2011 19:47:04 +0000

Wasting time is think it is over rated. I call it investment. it might take me a whole week to find out the problem but next time I deal with this kind of problem, It will not take me that long.
what I do in my shop, is I write in my note book the discription of the problem along with the equipment brand name and model number and the problem. then I disripe what I did to slove that problem. that way the next time I know what is right to fix the problem. it might take me an exta time to do that but in the long run, it is saving me a lot of time..a time well spent.

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By: admin

admin — Wed, 20 Apr 2011 19:21:54 +0000

HI Randy,

An extra of.5 amp could cause the set on fire! I hope the readers will this advice and only replace with the same rating of fuse. Thanks for sharing!

Jestine

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By: randy

randy — Wed, 20 Apr 2011 15:14:13 +0000

Thank you very for the encouragement. There are really times that you can not pinpoint the fault immediately when troubleshooting electronic equipments. And have lots of mistakes too. In my part, when I repaired my cousin's black and white television before, I checked the board and found out that it has a blown fuse and the surge limiter resistor opens. I replaced the two components and turned the power on. Suddenly the set caught fire and I saw with my two eyes that the fire rapidly eats one leg of the rectifier diode. I turned off the set immediately and check what's the cause of the fire. I found out that it was the fuse. the original fuse rated 2 amperes but I replaced it with 2.5 amperes. I overlooked the .5 amperes that makes the set to caught fire. In this experience, we must be very careful on replacing any components in any electronic equipments.

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By: admin

admin — Tue, 19 Apr 2011 23:57:14 +0000

HI Waleed,
Thank God for the goggles! My friend have asked me whether i want to wear contact lens or not and i told them that i preferred spectacles. Installing components the other way round also a problem for beginners.

Jestine

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By: beh

beh — Tue, 19 Apr 2011 21:12:04 +0000

miller
you said your blue ring is dead this could be by a simple problem like battery

check your 9 volt battry with your voltmeter you should get at least 8-8.5 volt dc
and then check the wire black and red of your blue ring that goes to battery they must be good when you ck them by ohmmeter
and must be attched by good solder to pcb ck and tell me
goodluck
beh

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By: Waleed Rishmawi

Waleed Rishmawi — Tue, 19 Apr 2011 20:18:49 +0000

when I started my repair work in my shop about 10 years ago, I did not know anything about put the parts back in their place on board. for expample. I could locate a bad transistor and I get the part for it but very often, the tv will not work and I spend a lot of hours trying to find out what the cause of the problem. I call my friend to help me out to realize that the transitor that I put back on board was put in reverse position and that is why the tv did not work..
other time I could remember the first time I replaced a capacitors on borad..again, back wards and some of them exploded in my face..I was wearing protecting glasses ( I always do)and saved my eyes from that flying capacitors..I did a lot of mistakes in my career..but thank God I started paying attention...things got better. I look back where are I was and where I am now, I thank God for everthing.

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