Battlezone Self Test "4FF" Code

[Battlezone Self Test "4FF" Code]

I have a Battlezone game that shows a 4FF code when I perform a self test. What does this indicate and where can I find this IC on the board? Where can I find info on this?

[Battlezone with dead CRT]

I performed the diagnostic self test and the screen shows a "4FF" not sure where this item is located, any help?

[Battlezone with dead CRT]

I replaced the IC #LF13201 and the spot killer LED went out and the display returned, however when I pressed the "start" button, the display still reads "game over" the spot killer LED returns, display goes blank, then spot killer goes off and display returns. I scoped the X and Y vectors going to the monitor and lose both of them when the sppot killer momentarilly comes on. The game will not go through its normal sequence and the fire button has no effect. Any ideas?

[Battlezone with dead CRT]

I have no "Y" input signal into the monitor, which is causing the monitor to go into the spot killer mode. Using an oscilloscope, I lose the signal from IC E10 on the vector generator board which is part #LF13201, now I just have to locate one of these, anyone have a source for this part?

[Battlezone with dead CRT]

Benny the references on the schematic refer to the monitor from a Tempest game, my monitor is an Atari quadrascan, chassis #G05802. The TO-3 transistors mounted on the frame of the chassis checked out OK. Any other ideas?

[Battlezone with dead CRT]

This machine seems to function properly, (audio and game functions) other than no picture on CRT. The neck of the CRT glows, but does not seem to be getting any deflection, I have a dot in the center of screen, which I assume is the spot killer. I checked the power supply voltages and all appear normal according to schematic. Any ideas are appreciated.