Read Sony HMD-A240 Service Manual online
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HMD-A240
SECTION 3: ADJUSTMENTS
Allow a 30 minute warm-up period prior to making the following
adjustments.
3-1. LANDING ROUGH ADJUSTMENT
1. Display the all white pattern.
2. Adjust the contrast to maximum value.
3. Display plain green pattern.
4. Slide the DY back and roughly adjust the plain green pattern with
2. Adjust the contrast to maximum value.
3. Display plain green pattern.
4. Slide the DY back and roughly adjust the plain green pattern with
the purity magnet so that it is centered on the screen.
5. Adjust HCENTER by HCENTER Volume (RV502 on D Board).
6. Moving the DY forward, adjust so that an entire screen be comes
6. Moving the DY forward, adjust so that an entire screen be comes
pure green.
7. Adjust the DY tilt and lightly tighten the DY screw.
3-2. LANDING FINE ADJUSTMENT
1. Place the monitor in the Helmholtz coil.
2. Set TLH plate to zero position.
3. Display plain green pattern.
4. Degauss CRT face and iron parts with degauss equipment or hand-
2. Set TLH plate to zero position.
3. Display plain green pattern.
4. Degauss CRT face and iron parts with degauss equipment or hand-
degausser.
5. Perform auto degauss.
6. Attach a wobbling coil to the speciÞ ed position of CRT neck.
7. Put the sensor of landing checker to CRT face.
8. Adjust purity, DY position and DY tilt.
9. Tighten
6. Attach a wobbling coil to the speciÞ ed position of CRT neck.
7. Put the sensor of landing checker to CRT face.
8. Adjust purity, DY position and DY tilt.
9. Tighten
DY
screw.
10. Perform auto degauss.
11. Adjust top and bottom pin by pitching DY up and down with two
11. Adjust top and bottom pin by pitching DY up and down with two
wedges so that [a] is equal to [b].
[a]
[b]
12. Adjust top and bottom pins to zero with TB. H.PIN VR. Also, V.SIZE
should be adjusted at the same time becasue it is changed by TB.
H.PIN VR.
H.PIN VR.
Connect the communication cable of the connector located on the D Board on the monitor. Run the service software and then follow the instructions.
13. Adjust V.Key (= H.Trapezoid) with H.TRP VR so that [a] is equal to
[b] (See Section 3-4.).
14. If the corner landing is out of speciÞ cation, use a disk magnet for
the landing correction.
15. If disk magnets were used, perform an auto degauss.
16. Remove the wobbling coil and sensor.
17. Fix the purity magnet on DY with white paint.
16. Remove the wobbling coil and sensor.
17. Fix the purity magnet on DY with white paint.
3-3. CONVERGENCE ROUGH ADJUSTMENT
1. Enter the white crosshatch signal.
2. Roughly adjust the horizontal (H.STAT) and vertical (V.STAT)
2. Roughly adjust the horizontal (H.STAT) and vertical (V.STAT)
convergence at four-pole magnet.
3. Roughly adjust HMC and VMC at six-pole magnet.
3-4. CONVERGENCE AND V. KEY (H. TRP)
FINE ADJUSTMENT
6-pole
Mg
4-pole
Mg
TLH Plate
TB Pin VR
YCV VR
CRT
DY
XCV VR
TLV VR
H-TRP VR
Purity
Magnet
Neck Ass'y
A Board
1. Display crosshatch pattern with green lines and black Þ eld.
2. Adjust V. Key (=H. Trapezoid) with H.TRP VR so that [a] is equal
2. Adjust V. Key (=H. Trapezoid) with H.TRP VR so that [a] is equal
to [b].
[a]
[b]
3. Adjust the TB Pin with TB Pin VR.
IBM at Computer
as a Jig
1
2
3
1-690-391-21
A-150-919-A
Interface Unit
3-702-691-01
Connector Attachment
Connector Attachment
To BUS CONNECTOR
D-Sub
(9 Pin [female])
Mini Din
(8 Pin)
4 Pin
4 Pin
4 Pin
* The Parts above ( ) are necessary for DAS Adjustment.
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3
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