Mai ntenance—455/A2/B2
5. Rotate both outer (A) and inner (B) shafts to .2 jus
position (third position from fully clockwise).
6. Install A and B TIME/DIV knobs in .2 /ms position.
7. With A and B knobs locked, check knobs can be set to
both X-Y and .2 /ms positions.
8. Install VAR TIME/DIV knob. VAR marking should
be right-side up when rotated fully clockwise to detent
position.
Trigger Board Removal
To remove board:
1. Remove shaft-knobs using procedure in this section.
2. Remove one screw securing upper rear corner of
board to module frame.
3. Unsolder, 47 12 resistor at B Ext Trigger input connec
tor, and three wires from rear of Trigger board.
To install board, reverse order of above procedure. Be care
ful not to bend pins when plugging on boards.
Horizontal Board Removal
To remove board: 1
1. Remove Trigger board.
2. Remove POSITION, LEVEL, and A TRIGGER HOLD-
OFF knobs. See shaft-knob removal procedure in this
section.
3. Remove screw and nut holding A and B Timing board
assembly to Horizontal board.
4. Remove screw holding rear of Horizontal board to
module frame.
5. Remove screw holding front of Horizontal board to
front subpanel.
6. Unsolder 47 12 resistor from Ext A Trigger input
connector.
7. Lay module on left side.
8. Unplug A and B Timing board assembly from Sweep
board and move it away from Horizontal board.
9. Unplug Horizontal board from Sweep board.
To install board, reverse the above procedure. Be careful
not to bend pins when plugging on board.
REV. A, O CT 1975
5-13
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