Measuring component readings

[Jonathan Wilcox]

I'm fixing a turntable and want to know how to test individual components on a circuit board. Can anyone advise me on what are the most important parts to test and how?

I have watched a few videos and have figured I need my multimeter on diode mode, wires on pos/neg and reading should be between 0.3 - 0.7 but that's about all.

Also what does it mean if a diode is below or above reading?

 

[DPG]

Not sure about the digital marketing side either - the punctuation and grammar are a bit hit and miss on your web site. I appreciate it's probably early days and you aren't fully up and running yet, but it could give a bad impression.

 

[Jonathan Wilcox]

Your website says your day job is "digital marketer" - but you've had to ask why I've posted a link to your website.

Hi Sean, I don't think me being a digital marketer has anything to do with you posting a link to my site.

Testing components is an area to the service I only added last week as I can now test diodes with my multimeter. However, I've since learnt from you guys it's harder than it seems to test other components, so I guess I will take it off until I embark on a course.

Besides, I thought this forum was a place where people help and support each other, not pick

I think things have been covered pretty well by Lucien. If you are embarking on providing electronic repairs to component level then you have some reading and learning to do.

Thanks for the heads up on the courses DPG

 

[sean_ork]

The conventional route to forming and running is a business is to spend a period of time learning a skill, then another period of time practicing that skill.

Conventionally, perhaps after many many years of training in a relivant field, during which you'll have proven your competence, and established that its of financial value, some folks then sell that skill via the formation of their own Company.

That's the conventional route.

You appear to have formed a Company, and are selling a range of services, before having first accuired the necessary skills.

Perhaps I'm just old fashioned.

 

[Jonathan Wilcox]

Not sure about the digital marketing side either - the punctuation and grammar are a bit hit and miss on your web site. I appreciate it's probably early days and you aren't fully up and running yet, but it could give a bad impression.

It's just an all lowercase writing style which I think looked consistent and cool. That's ok if it doesn't appeal to you, you're entitled to your opinion after all. Yes, I admit I have started the service the wrong way around. But I was desperate for money and wanted to experience setting up a website to enrich my job applications – seeing as I'd just lost my job. I'm not claiming to do something I can't; I can solder well so I don't really see the problem. Anyway... you can either choose to make the world a happier and more supportive place or make fun of others – seems like you're opting for the latter

 

[sean_ork]

No one is making fun, it's just a small dose of reality.

Welcome to the real world.

 

[DPG]

Lower case is ok for logos etc. but place names and "I" etc. look wrong. Paragraphs of text ought to used mixed case.

 

[Jonathan Wilcox]

Lower case is ok for logos etc. but place names and "I" etc. look wrong. Paragraphs of text ought to used mixed case.

I did dwell over it for a while – well thanks for your feedback guys. I will get amending when I have a spare minute

 

[DPG]

I did dwell over it for a while – well thanks for your feedback guys. I will get amending when I have a spare minute

Constructive feedback - no offence intended.

 

[Golden_Boy]

I was in the electronics repair industry for 50 years.
Unless you know how components are SUPPOSED to work you have almost no chance of finding a faulty part in transistorised Equipment.
Having said that there are available from china, very cheap component testers that will tell you what the component is as well as the value of it. The big problem is that unless you replace ALL the faulty parts you risk the whole lot failing again as soon as you apply power..

 

[static zap]

If the equipment has any " intelligence" built in you need to be aware of it for fault finding process .
( A quick schematic hunt - lead me up garden path, similar models)

 

[EalingBadger]

Another common problem with old electronic kit is dry joints. Many an item has been successfully repaired by rewetting such a joint. One electronics engineer that I hold in very high regard will often rewet every joint on a PCB if he suspects dry joints though I've never had to resort to going this far myself.

I also second the advice of others - electrolytic capacitors have a strictly limited life which is particularity sensitive to elevated temperatures within equipment.

Also beware of 'copper cancer'. Some PCBs are prone to having the copper tracks 'eaten' by the coatings originally applied to protect them. Quad pre-amps of a certain age, for example, are particularly prone to this.

All in all though, this is an electricians forum, and you would be better off seeking advice from somewhere that specialises in electronics.