Horizontal Vertical

Ba s Before you begin, perform the geometry setup procedure. Important Perform the horizontal and vertical adjustment steps in the order presented. Perform the step only if you must to attain the correct alignment. 1 Using Display Service Utility, display East West Bars. 2 Using the insulated screwdriver, adjust the H-PHASE control counterclockwise until Bars the left bar wraps at the left edge of the screen. Turn the control back until the right bar stops. Center the control between these...

Geometry Setup

Remove the main board access panel Let monitor warm up 15 minutes Align monitor to magnetic North South Warning This product contains very high voltages. When performing live adjustments, be careful not to touch high-voltage components shown at left. Important You must perform the geometry setup procedure before performing any other geometry adjustments. After completing the geometry setup, go directly to the geometry adjustments (horizontal and vertical, convergence, or focus)that will fix...

Power Supply Shield

1 Loosen (but don't remove) the five screws that secure the power supply shield to the chassis. 2 Swing the shield open and lift it off the chassis. 1 Loosen (but don't remove) the five screws that secure the CRT shield to the chassis. 2 Pull back the shield and lift it off the chassis.

General

The Symptom Charts included in this chapter will help you diagnose specific symptoms related to your product. Because cures are listed on the charts in the order of most likely solution, try the first cure first. Verify whether or not the product continues to exhibit the symptom. If the symptom persists, try the next cure. (Note If you have replaced a module, reinstall the original module before you proceed to the next cure.) If the monitor has a no raster condition, refer to the...

Main Board

Remove the main board and CRT shields Remove the flyback transformer (only) Awarning This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins Safety. Awarning Never use a grounding wriststrap until after discharging the CRT. replacing the main board, make sure it is compatible with the CRT. Rev A CRTs require Rev A main boards Rev B CRTs require Rev B main boards. See Rev A B Compatibility in Additional Procedures. 1...

Degauss Coils

Discharge the CRT and remove the anode cap Remove the flyback assembly Awarning This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins Safety. Awarning Never use a grounding wriststrap until after discharging the CRT. Note The upper and lower degauss coils are replaced as a set. The coils are interchangeable. 1 Disconnect the 2-wire cable from the upper and lower degauss coils. 2 Using a wirecutter, cut the tie-wraps that...

Position Sensor Board

Awarning This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins Safety. Awarning Never use a grounding wriststrap until after discharging the CRT. 1 Disconnect the 6-wire cable from connector X911 on the position sensor board. 2 Note To pry out the fasteners, you may need to reach beneath the position sensor board and pop up the fasteners with your fingers. Using a jeweler's screwdriver, pry out the two fasteners and remove...

Assembly

Remove the main board and CRT shields Warning This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins Safety. Awarning Never use a grounding wriststrap until after discharging the CRT. Note The flyback transformer assembly includes the flyback transformer, the high-voltage block, and the anode connector and wire. To access other modules, you may need to remove only the high-voltage block or the flyback. 1 Pull the CRT video...

Light Meter Setup

This topic covers setup for three light meter models R77, L-248, and 246. Model R77 Apple part number 076-031 0 is the newest model available. The R77 light meter is capable of reading luminance from 1 0 to 1,000 footcandles fc . Before you begin, remove the 10X multiplier plate Three scales are shown on the light meter Because display screen luminance typically ranges from 10 to 50 fc, take readings from the bottom scale only. To measure a display screen's luminance, 1 Set the scale switch to...

Contrast Brightness and LED

Awarning This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins Safety. Awarning Never use a grounding wriststrap until after discharging the CRT. 1 Press the clear plastic tab and remove the LED from the LED holder. Pull out the LED lamp. ,. wd- u assembly from the bezel. Assembly Pu and keep the two

OnOff Switch

Remove the power supply shield Awarning This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins Safety. Awarning Never use a grounding wriststrap until after discharging the CRT. 1 Disconnect the 2-wire power cable from power supply board connector X657. 2 Remove the screw that secures the on off switch ground wire to the chassis.

Magnetometer Degauss Board

Remove the main board and CRT shields Warning This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins Safety. Awarning Never use a grounding wriststrap until after discharging the CRT. 1 Disconnect the following cable connectors from the magnetometer degauss board 4-wire cable with jumper from X854 2-wire, 3-pin cable from X852 2 P u 11 o pen the two latches and remove the magnetometer degauss board.

Magnetometer Coils

Discharge the CRT and remove the anode cap Remove the flyback assembly Awarning This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins Safety. Awarning Never use a grounding wriststrap until after discharging the CRT. Note The front and rear magnetometer coils are replaced as a set. 1 Remove the two nuts from the upper CRT mounting bolts. 2 Unhook the front magnetometer coil from the upper, and then the lower, mounting...