My board looks identical but shows YM752 instead of YJ422. Do you know the difference between them? I can't find anything on the YM752.

I have to hold down the power button to get any power to come through. If I do this, I measure about 11V at test point 1. I have 4.95V at test point 2. Test points 3, 4, and 5 all show only .13V. This indicates that IC26, IC24, and IC2 would all be bad on the DM board. However, I don't know if that is the case since the board number is different. Any advice here is greatly appreciated. I don't want to order a YJ422 board and have it not work. Or a new YM752 and have that not be the issue even.

@oldturkey03 The test procedure above states it is for "No power indicator with power switch on". I have no power indicator so I followed that procedure. The board with the switch is only a simple button and all the controls are back on the DM board.

Now, the YM752 that is in mine can be found online and is listed for the P125. I see that the YJ422 is listed for the P128 online. However, the service manual, it shows that the YJ422 should be in the P125 so this is why I am confused. The boards look identical from what I can see, but I expect the P125 and P128 must have different programming.

In the manual, the JK board shows mosfet Q104. Mine does not have this component at all. There is a place for it but just nothing there. R104 is also missing as well as a bunch of other components shown. My model is just P125B but I see the ones in the service manual are listed as P125B/P and others. I expect they are a bit different. It is all rather confusing.

⟐ Commented October 02, 2024 at 21:00 MST

⟐ Answer edited October 01, 2024 at 12:51 MST