K8056

Kits PC Related Projects
1

Hi,

Just finished with the assembly of my second K8056 board and have the follwing problem

All Relais from 1 to 7 do work except #8 does not respond when sending a command via the RS232 port. Relais #8 does switch if I connect a switch to the input.

If I manually shorten the Collector/Base directly on the transistor it does respond.

Could somebody please tell me which element could be faulty ?

Thanks in advacnce for any hint what element to replace I would be very thankfull

2

Does it work with the manual test button ? Try with PIC of first relay board. If it works, return defective PIC for inspection/exchange.

3

No, it does not work with the manual test button.

How much does that 14 feet bug cost ?

I live in Mexico and bought the Kit in USA and mexican mail is not trustworthy and shipping the chip via any courier service costs me as much as a new board.

:confused:

I have a EPROM programmer. Can I reprogram the chip in case it is defective ?

4

OK, so it does not work with the manual test button.
Now, did you try with the PIC from the K8056 that does work completely ?

5

[quote=“VEL417”]OK, so it does not work with the manual test button.
Now, did you try with the PIC from the K8056 that does work completely ?[/quote]

Yes, I just exchanged the PIC from the good board the the bad board and the problem remains the same. So it is not a PIC problem I would say.

Thanks for any tips …

6

Then either the transistor is defective or there is an interruption or short in the line from the µcontroller to the base of the transistor.

7

I have checked the board with a magnifying glass and everything looks proper. Will get a transistor and a diode and exchange them on the board. Maybe the transistor suffered from too much heat while soldering

Thanks so far

8

Problem solved

Transistor BC547B was damaged.

Exchanged tarnsistor and now it is running

9

Happy to read you were able to solve the problem.

10

All my other programs work with no problems its only when I try compiling the sample code suplied with the K8056.

Is there not maybe anything else I need to install or include to allow the program to talk through USB??

11

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