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08-26-2022, 08:33 PM
Hi Jim
You have the output transistors swapped.
The numbers on the packages are very faint - as they do it now with lasers instead of ink - and it also looks like maybe you used flux remover that might have obscured some of the printing on them. Fortunately there is a C still visible which is the NPN device for position QN6; thew A is PNP for position QP7.
You can do a resistance check on each device from E to C and hopefully this will read high - at least not-zero. You may be able to swap them into their correct places and have it work provided you can extract and resolder them without overheating them. I can send you a new pair.
There is also a solder tail or slash on the bottom of the board in the upper right corner. Check what that is.
Have fun
You have the output transistors swapped.
The numbers on the packages are very faint - as they do it now with lasers instead of ink - and it also looks like maybe you used flux remover that might have obscured some of the printing on them. Fortunately there is a C still visible which is the NPN device for position QN6; thew A is PNP for position QP7.
You can do a resistance check on each device from E to C and hopefully this will read high - at least not-zero. You may be able to swap them into their correct places and have it work provided you can extract and resolder them without overheating them. I can send you a new pair.
There is also a solder tail or slash on the bottom of the board in the upper right corner. Check what that is.
Have fun
