testing an ic?

corky

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i did a search, but wasnt very productive since ic is too short of a term to search for, so forgive me if this has been (surely) covered.

how do i test an ic with a multimeter? specifically, im looking to test ic401 on a matsushita tm-202g (en11235 chip). any help is much appreciated
 
i did a search, but wasnt very productive since ic is too short of a term to search for, so forgive me if this has been (surely) covered.

how do i test an ic with a multimeter? specifically, im looking to test ic401 on a matsushita tm-202g (en11235 chip). any help is much appreciated

Short answer is 'you can't'.

The term "IC" stands for Intergrated Circuit and there are many millions of different types all with different functions. A logic probe is most often used on gameboards with most common 74 and 40 series ICs or an oscilloscope (CRO).
 
You will have to look up the datasheet for the IC you want to test. Then test the input and output voltage with your meter once you find out what it should or should not be. You will need a logic high/low meter to test most any logic IC.
 
If you look at page 30 of this manual:

http://arcarc.xmission.com/PDF_Monitors/Atari Monitor TM-202 1st Printing Matsushita 19in.pdf

You'll be able to see all the voltage readings you should get for each pin. Using the diagram in the schematics (and the datasheet if you can find it), check all the voltages on the input pins first to see if they are right. If not, then your problem is most likely elsewhere and your IC isn't operating properly because it is getting improper input. If the inputs look good, then check the outputs. If they are bad, replace the IC and check again (in case another part downline is causing an improper voltage reading). If you have the proper output voltages, then your IC might be okay. If you're having problems with sync or deflection, then you'd need an o-scope to check the signals coming out, and it's sometimes easier to just replace the IC...
 
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