Max 100 frequency counter

[kaos513]

Hello guys I need some help trying to get this unit to work its a Max-100 frequency counter only thing I see when its powered up is the dot on the lcd front panel comes only I do not see any numbers thanks.I will be uploading pictures of the unit today thanks.

 

[Tallman]

Be careful applying signal to it. Don't hook a radio to it and key up.

 

[kaos513]

Be careful applying signal to it. Don't hook a radio to it and key up.

Of course,here is the update so far i get 10 volts with a 10v power adapter through the power switch.also going through the power jack.

 

[Tallman]

Do you have a schematic? Trying to trouble shoot without a schematic is like "Do it yourself brain surgery."

 

[kaos513]

Do you have a schematic? Trying to trouble shoot without a schematic is like "Do it yourself brain surgery."

trying to find one my self.

 

[Tallman]

Have you opened it up? What type of processor chip does it have? Look like this?

 

[kaos513]

Do you have a schematic? Trying to trouble shoot without a schematic is like "Do it yourself brain surgery."

Looking for one my self thanks.

 

[kaos513]

Have you opened it up? What type of processor chip does it have? Look like this?

Same one,when i put in new batteries just gives me a dot no zeros like yours,also when i plug it in using 10 volt adapter i get nothing on the lcd screen thanks.

 

[Tallman]

That's not my frequency counter! It's a photo I got from Bing doing a search for your schematic. Now I can get down to it on a strong search.
Is there a reset button?

 

[kaos513]

Same one

That's not my frequency counter! It's a photo I got from Bing doing a search for your schematic. Now I can get down to it on a strong search.
Is there a reset button?

Below is the picture of the unit

 

[kaos513]

Here is the picture

 

[kaos513]

Below is the picture of the unit

Here are more

 

[Tallman]

Check and see which regulator you have. I'm willing to bet it is a 7812 or maybe a LM317. Check and see the if DC volts are on the top of the big capacitor and then on the output of the regulators. I don't know what your skill level is so forgive me if you think I am talking down to you.
Look up the various 4000 series chips and check for the voltage on the power input pin and see if it is there.
Also do you have an oscilloscope? The following link is for the main chip inside.
http://pdf1.alldatasheet.com/datasheet-pdf/view/71308/LSI/LS7031.html

 

[kaos513]

Check and see which regulator you have. I'm willing to bet it is a 7812 or maybe a LM317. Check and see the if DC volts are on the top of the big capacitor and then on the output of the regulators. I don't know what your skill level is so forgive me if you think I am talking down to you.
Look up the various 4000 series chips and check for the voltage on the power input pin and see if it is there.
Also do you have an oscilloscope? The following link is for the main chip inside.
http://pdf1.alldatasheet.com/datasheet-pdf/view/71308/LSI/LS7031.html

Noticed the counter has been worked on,as I seen some new solder under the board, below is the picture

 

[222DBFL]

No photos came through kaos513. Try posting it again. Thx. Been reading this one and keeping up with it. Anyhow. Hope you get it working. Good day.