Read Sony HMD-A440 Service Manual online
HMD-A440(E)
3-1
SECTION 3
ADJUSTMENTS
•
Landing Rough Adjustment
1. Enter the full white signal. (or the full black dots signal)
2. Set the contrast to “CONT”=MAX.
3. Make the screen monogreen.
Note: Off the outputs from R ch and B ch of SG.
4. Reverse the DY, and adjust coarsely the purity magnet so that a green
raster positions in the center of screen.
5. Adjust the "H.CENTER" with the H CENTER Switch. (S501 on the D
board)
6. Moving the DY forward, adjust so that an entire screen becomes
monogreen.
7. Adjust the tilt of DY, and fix lightly with a clamp.
Note: “TILT” shall be set at 0
•
Landing Fine Adjustment
1.
Put the set inside the Helmholtz coil.
2.
Set the TLH to the Zero position.
3.
Receive the single green signal.
4.
Demagnetize the CRT surface with the hand degausser , and perform auto
degaussing.
5.
Attach the wobbling coil to the designated part of the CRT neck.
6.
Attach the sensor of the landing adjustment unit on the CRT surface.
7. Adjust the DY position and purity, and the DY tilt.
8. Fasten DY with screw.
Note:Torque 22 ±2kgcm (2.2 ± 0.2 Nm)
Perform auto degaussing.
Purity Magnet
<<Zero Position>>
L/D control specification
± 3
± 7.5
± 3
± 3
± 7.5
± 3
± 5
± 7.5
± 3
Purity magnet position
± 3
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