Logic Board Assembly

A 5 MHz dot clock drives a 9-bit Horizontal dot Counter (S16, S17 and T17) and an 8-bit Vertical Line Counter (G17 and K16). The horizontal counter counts from 0 to 255 during active scan lines and 256 to 317 during the horizontal blanking time. When the horizontal counter reaches 317, it resets to zero. At the beginning of the horizontal blanking time (horizontal counter 256), it increments the vertical counter. The vertical counter counts from 0 to 239 during active vertical blanking time....

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Disconnect the video plug A17J1, the monitor power supply plug A12J3 A12P3 and the ground wires from the monitor chassis. 12. Remove the four bolts from the underneath side of the monitor shelf. 13. Remove the monitor from the front of the game, being careful to clear all cables from the CRT neck. 14. For reassembly, reverse the above procedure. NOTE Reinstall the lens with the ridges facing the player compartment. NOTE The color monitor contains HIGH VOLTAGES delivering LETHAL quantities...