Onix CD-1----Play, no tray

[laatsch55]

So, I have it narrowed down to the IC that drives the tray open/close. How do I probe it?>?

 

[Gepetto]

Do you have a dip clip Lee?

 

[laatsch55]

LMOAO< Joe what jumped in my mind wasn't even close!! But , no sir, I do not. Don't even know what they are.

 

[Gepetto]

I think that the tray drive IC logic would be on the board that is attached to the bottom of the drive itself. Probably a surface mount device, that would be my guess. The TDA7073 you have pictured is a dual channel amplifier.

 

[laatsch55]

The 2 wires that run the tray and tray position switch leave the transport unmolested by way of the 4 wire harness. I will show the bottom of the board where the harness plugs intom in the next post.

 

[Gepetto]

420 is gone Lee so it isn't one of those clips. This is a pic of a dip clip.[attachment=0:1o5xbbzv]dip clip.jpg[/attachment:1o5xbbzv]

 

[Gepetto]

OK do the gray and red wire in that 4 pin connector trace to the TDA7073 on the main board?

 

[Gepetto]

traces will be on the bottom of the board since the top is totally covered by thieving...

 

[laatsch55]

The first group of 4, bottom two wires. Yes Joe they do.

 

[Gepetto]

looks like you may have to lift the main board to find out where those two wires end up getting driven by. It could be the TDA but it is an unusual application for that IC.

 

[laatsch55]

Thieving?? Now there's a new electronic term kinda like kerfluffle.

 

[Gepetto]

OK pins 9 and 12 are driving the motor, I agree to that. When you scope pin 9 and 12 and attempt hit the drawer open button is there any activity on pins 9 and 12? One should go high and the other one low.

 

[laatsch55]

The two wires driving the motor yes, the 2 that come from the limit switch, no.

 

[Gepetto]

thieving is a PCB term, it is the copper pattern on the topside of the board. They do that to improve yield in the PCB fab process.

 

[laatsch55]

Scope? As in NOT THE FLUKE?? Never scoped an IC Joe.

 

[Gepetto]

your oscilloscope Lee. Pull the tip of the scope probe off and it will have a pointed probe tip which will allow you to get into tight places

 

[Gepetto]

sort of like this[attachment=0:11528w2x]220px-ScopeProbe.jpg[/attachment:11528w2x]

 

[Gepetto]

You need to find out what is going on on pin 9 and 12 of that IC

If no action there then you need to see what is happening on pins 6 and 7 which are the inputs to that driver IC

 

[Gepetto]

set your scope up on DC input and the 5V/div scale to look at pins 9 and 12, set triggering to auto mode for constant tracing.

 

[Gepetto]

here is the data sheet for the TDA7073 IC