sharing mutual knowlwdge about electronic repairs

Well bless you frog17!

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Welcome to CR4.

Welome. I always think repaire hf is very trouble, especially withut instrument. how do you manage it when no instrument like scanner, oscalloscope etc. besides lots of chips cannt see their pins clearly

Its surprising what you can do without a scope or digital multimeter you know...

Sometimes all you need is your eyes and your nose!

Just last week I had to repair one of my 6½ digit multimeters, I used a screwdriver to open it up and my nose to smell what had burnt, then using my eyes I found the mains inlet filter had self destructed - so it needs a new one....

Repair of £500 instrument took 1 hour and one screwdriver.

John.

Not to mention, a good pair of ears!

In the factory where I work, we use lots of ink jet printers for printing batch codes on our products.

On my first day on the job, I found about a dozen of the things on the workshop bench which no one could repair. The company had actually given up on them and ordered new ones. I decided to have a look at them.

On the first one I opened, there was nothing burned. I plugged it in and started hearing a shrill whistling sound. It wasn't loud, in fact, you needed to listen very carefully for it. There were rows of transistors which controlled the print head solenoids and I isolated the sound to one of them. I replaced the transistor and tested the thing. It worked!

Since there were no spare parts, I had to sacrifice a few of the units to fix the others. All in all, I brought 8 of them back to life.