I hope you can help me.. thank you..!!

 

It could be a proprietary chip number, in which case you are likely sol.
Where is the circuit board from?

 

https://www.digipart.com/part/OP07
https://www.analog.com/en/search.html?q="OP07-421L"

 

What are you attempting to accomplish that you need the data sheet? Repair, analysis, or duplication?

 

It could be a proprietary chip number, in which case you are likely sol.
Where is the circuit board from?

It is a small thermal printer and this component is in the infrared communication sector. I have not found anything about this device.

 

What are you attempting to accomplish that you need the data sheet? Repair, analysis, or duplication?

I am trying to repair this device. apparently everything is fine, but it doesn't work. so I'm testing component by component.

 

This is a better photo of the pcb. I put some indications of the connection with the IR transmitter

 

View attachment 187224
View attachment 187225
https://www.digipart.com/part/OP07
https://www.analog.com/en/search.html?q="OP07-421L"

Thank you for answering me. but it seems to me that it is not an operational. it looks like a kind of buffer

 

Thank you for answering me. but it seems to me that it is not an operational. it looks like a kind of buffer

Why do you say that?
Looks where?

 

I am trying to repair this device. apparently everything is fine, but it doesn't work. so I'm testing component by component.

Evaluating an inoperative piece of equipment a part at a time is a very tedious approach. A more logical way will be to evaluate the functionality of sections. Is the printer "Stone Dead?", or not? A logical search would start with verifying that the power switches on and that the correct voltages appear at supply pins. Then would come an examination of outputs, to see if they were reasonable levels. Wit an IR data port, verifying that the LED puts out and that the photo-detectors are working is a logical step. LEDs do occasionally fail, and photosensors have been a source of many failures in the devices that I have repaired. Not a total failure, just a loss of sensitivity. So looking at the functions that don't function is a better way to find the problem.

 

Evaluating an inoperative piece of equipment a part at a time is a very tedious approach. A more logical way will be to evaluate the functionality of sections. Is the printer "Stone Dead?", or not? A logical search would start with verifying that the power switches on and that the correct voltages appear at supply pins. Then would come an examination of outputs, to see if they were reasonable levels. Wit an IR data port, verifying that the LED puts out and that the photo-detectors are working is a logical step. LEDs do occasionally fail, and photosensors have been a source of many failures in the devices that I have repaired. Not a total failure, just a loss of sensitivity. So looking at the functions that don't function is a better way to find the problem.

Hi, thanks for helping me with this problem.
I already did the conventional steps to test the hardware. I measured the source and the regulatory stages. I did a visual and electrical inspection and everything is fine.

+ the device turns on
+ the buttons work
+ the electric motor works
+ the paper presence sensor works
+ I measured the lines of communication and they work well

RX signal:


TX signal:


It just does not print...!!

I'm going to do a couple more tests and if it doesn't work. I will finish the repair work.
Anyway, thank you very much for helping me.

 

Is there another way to send data to the printer aside from that IR link? That would allow you to verify that the rest of the system is OK.
And as for the visual inspection not finding anything, many electronic failures are inside devices and have no visible problems. And when a part burns up, usually that is caused by some other part not being right, So replacing the burned part is the small part of the repair. The question is always why did it burn up?

 

Is there another way to send data to the printer aside from that IR link? That would allow you to verify that the rest of the system is OK.
And as for the visual inspection not finding anything, many electronic failures are inside devices and have no visible problems. And when a part burns up, usually that is caused by some other part not being right, So replacing the burned part is the small part of the repair. The question is always why did it burn up?

Unfortunately the only method of communication is by IR. As I mentioned before. I did a visual and electrical inspection, measuring many of the components and everything seems fine. I'm already frustrated with this device. hahaha.
Again I want to thank everyone for helping me..!!