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VECTREX WITH PROBLEMS

daver2 said:
Excellent. That definitely indicates to me that the power board looks Ok.

If you remember, we were not getting any negative (left of centre) X deflection before. Now we do?

Dave
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Yes i remember, i hope that tomorrow arrives the New ic! Thanks so much! Good night sir!
 
Hi Dave,
unfortunately the new is isn't arrives yet....so i decided to unsold from the other vectrex now...
 
That's a bu*ger!

Did you use a socket for IC306? In which case can you pull it again and post a video of the test you did back in post #293 please.

Did you check the continuity of the power pins from IC306 (as I described in post #285)?

After that it could be IC305 (4066B) or the integrator capacitor from the output to the inverting input of IC306.

It has to be something around IC306.

Dave
 
daver2 said:
That's a bu*ger!

Did you use a socket for IC306? In which case can you pull it again and post a video of the test you did back in post #293 please.

Did you check the continuity of the power pins from IC306 (as I described in post #285)?

After that it could be IC305 (4066B) or the integrator capacitor from the output to the inverting input of IC306.

It has to be something around IC306.

Dave
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Not Dave i havent ic306 socket so i solded directly on board :(compared to before the image is centered but it is always compressed :(
 
maybe i could try to change the integrator capacitors ... i have to order them though.
 
You only need to change one (1) integrator capacitor of course.

I would order a 4066B at the same time, they should be pretty cheap anyhow.

Assuming you didn't damage IC306 when you removed it, you have a spare...

Dave
 
Oh, hang on a minute - have you adjusted the X-SIZE control?!

Before the image wasn't centred was it...

Can you also use your oscilloscope to measure the output voltage of IC306 pin 6 again.

Let's double check things before we jump to conclusions!

Dave
 
I'm afraid it's serious damage unfortunately :( will we be able to solve this puzzle this time? :(
 
Ops.... I realized now that the chip I mounted is one MC34002.. It's like MC34001 ??
 
Doooo!

Check twice solder once!

>>> Ops.... I realized now that the chip I mounted is one MC34002.. It's like MC34001 ??

Check the data sheet: https://www.mouser.com/datasheet/2/389/ST_MC34002P-1-1204073.pdf.

The MC34001 and the MC34002 are (unfortunately) completely different devices :cry:!

The MC34001 contains one operational amplifier and the offset null pins.

The MC34002 contains two (2) operational amplifiers and no offset null pins.

As a result, the pinouts of both chips are completely different. For example, the output of the MC34001 is on pin 6. This pin is an inverting input on the MC34002.

Sorry, you are going to have to desolder the MC34002 and install the correct part. The VCC pin is even in a different location between the two parts. I don't think you will have done any damage to the Vectrex though. I suspect the MC34002 may be toast though!

Dave
 
daver2 said:
Doooo!

Check twice solder once!

>>> Ops.... I realized now that the chip I mounted is one MC34002.. It's like MC34001 ??

Check the data sheet: https://www.mouser.com/datasheet/2/389/ST_MC34002P-1-1204073.pdf.

The MC34001 and the MC34002 are (unfortunately) completely different devices :cry:!

The MC34001 contains one operational amplifier and the offset null pins.

The MC34002 contains two (2) operational amplifiers and no offset null pins.

As a result, the pinouts of both chips are completely different. For example, the output of the MC34001 is on pin 6. This pin is an inverting input on the MC34002.

Sorry, you are going to have to desolder the MC34002 and install the correct part. The VCC pin is even in a different location between the two parts. I don't think you will have done any damage to the Vectrex though. I suspect the MC34002 may be toast though!

Dave
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Damn!!! Sorry :( i remove again and i waiting for new ic306..
Thanks!
 
daver2 said:
I suspect the MC34002 may be toast though!
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Fortunately ic is safe! I resolded in the other Vectrex and she works (like before)...if i press o if i move stick, screen goes black or the power seems to go off .. but we will see later. Now I'm waiting for these new MC34001 ...
 
Hi Dave, did you receveid my little gift? ;)
Today is a lucky day! Finally i receveid the two new MC34001, now i sold on pcb....cross my fingers ;)
 
As usual you are always number 1!
We have a decent video now ... although there is still something weird, we now have a decent screen!
I put the R401 and R408 potentiometers back as at the beginning but there is still something to fix ...
What can we do now?
Thanks so much ;)

 
>>> Hi Dave, did you receveid my little gift?

The parcel turned up today. Thank you very much! I will have to make some nice pasta to go with it...

It’s good that we have a ‘full sized’ screen to view now!

I am going out this evening, so we will continue this repair tomorrow.

It looks to me as though this ‘glitching’ is on the ‘Y side’ of the image. Is that your thought as well?

I would suggest putting the diagnostic cartridge into your other Vectrex and scoping the outputs of IC304 and IC306 (pin 6). Note what the picture image looks like and the oscilloscope traces from the two operational amplifiers. Then, compare and contrast the image and oscilloscope traces from the current machine - and look for the differences.

We can work from there.

Dave
 
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daver2 said:
The parcel turned up today. Thank you very much! I will have to make some nice pasta to go with it...
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Yes!! Pasta or meat! ;)
daver2 said:
It looks to me as though this ‘glitching’ is on the ‘Y side’ of the image. Is that your thought as well?
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Yes vertical position isn't correct and maybe Z axis... also the image trembles :(
 
Z axis is the brightness of course.

What I am trying to work out from the short video clip is whether the image is only trembling in the Y direction or both the X and Y.

Dave
 
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