Repair Schematics

[CV Gus]

Does anyone have any idea how one can obtain repair schematics for the CV, CV 2600 Module, and CV Roller Controller?

 

Thanks.

[channelmaniac]

Schematics for the CV are available on the web. I have some on my PC in the workshop if you want to PM me an email address I'll send 'em to you.

 

I would think that the 2600 expansion is pretty close to a 2600 itself. There isn't much to a 2600: 1 6507 CPU, 1 6522 RIOT (RAM, I/O, and Timer), and a TIA chip.

 

RJ

[CV Gus]

Actually, I'm looking for repair schematics- the ones that tell you what voltages should be where. This way, if something is off, it tells you, and where one should look. I'm sure repair centers had them from Coleco.

 

Are those the ones you have?

[channelmaniac]

No. I just have the schematics.

 

This is digital logic, you aren't going to find "voltage levels" on the chips but rather "logic levels." Instead of measuring voltages you should be looking at the logic levels with a logic probe or an oscilloscope to determine where the problems are.

 

It's not hard to learn digital logic and what signals you should be seeing on the chips. It does take time and patience. Check my repair logs for the post "How RAMs and ROMs are read"

 

http://newlifegames.net/nlg/index.php?topic=18.0

 

RJ

[CV Gus]

Well, votages is a bit old-fashioned, but they are valid.

 

Resistors, for example, can affect them. So an off voltage can help you trace a blown resistor, for example.

 

My 2600 module has a problem: the player one paddle does not work properly. By comparing the voltages at the pins with a working one, I saw the difference in voltage. A repair scematic would tell you what to look for at that point.

 

But I will check out your website and instructions.

[+5-11under]

Hi CV Gus,

 

If I recall correctly, the 2600 uses a charge circuit to figure out the paddle location. There should be a resistor and capacitor near the DB9 jack that might be at issue.

 

Thanks,

5-11under

[supercat]

My 2600 module has a problem: the player one paddle does not work properly. By comparing the voltages at the pins with a working one, I saw the difference in voltage. A repair scematic would tell you what to look for at that point.

 

For some applications, a high-impedance (at least a meg or so) audio amplifier can be a useful diagnostic device. When playing a paddle-based game, the paddle input should have a 60Hz saw wave whose volume will be controlled by the paddle. If something else is heard, that would suggest a problem.