Odd JV4 Behavior

[Rotary Ryosuke]

Recently I have been trying to get a JV4 printer going but it does not want to fire Black, Yellow, Magenta, nor Cyan. It will only fire Light Magenta and Light Cyan. To test the slider board, I swapped a pair of ribbon cables with another. The ribbon cables I switched were CN3, CN11, CN6, and CN14. CN3 and CN11 are pairs as are CN6 and CN14. Once I switched the ribbon cables, it would fire the other four colors but not Light Magenta and Light Cyan. Is this a slider board issue or more likely something else?

Attached are pictures of the board.

 

[inkjet frank]

This could be a slider board issue but is most likely the HDC board that controls your light heads. The HDCs are under the main board the LC/LM board has 1 heat sink and the CMYK board has 2 if that helps.

 

[TBFL]

I recently had this problem on my JV4 and I was told to replace the heads one by one with a head that is electrically sound. On the first one I replaced (black) the other colors fired. I had a bad head!