Editing Video Board Schematic (section)

== What is on the sheet ==
The full component-level circuit of the display assembly: the mains transformer T1, the CR19–CR22 bridge, the 4700 µF reservoir C1, regulator VR1 producing '''+12 V''', the '''−30 V''' rail, the '''+85 V''' boost rail, the horizontal output stage around Q14 and flyback T2, and the CRT anode supply of roughly '''+10 kV'''. Values are printed against components on the drawing.

'''Fourteen oscilloscope waveform photographs''' are printed on the sheet at their test points. The vertical and timebase setting for each is '''not''' on this drawing — it is on a separate supplement, held here as [[Schematic Notes for Video Board]]. The two documents are useless apart.

=== The five service notes printed on the drawing ===
1. Adjust for best focus; voltage is selectable.
2. '''R20 is mounted perpendicular to the board''' for screwdriver adjustment.
3. '''R9 is at the rear of the PCB''', on a 1/4-inch shaft about 2 inches long.
4. Board connectors are '''Molex 09-64-1021''' and '''09-64-1061'''.
5. On the flyback terminals and C25, '''the numbers in parentheses are for the DOK version''' — the alternative flyback, Commodore 902475.

The sheet marks flyback T2 as '''GI 294-7746'''.