Section 3: Adjustments; Landing Rough Adjustment; Landing Fine Adjustment; Convergence Rough Adjustment - Sony Trinitron HMD-A240R Service Manual

Connect the communication cable of the connector located on the D Board on the monitor. Run the service software and then follow the instructions.
IBM at Computer
as a Jig
D-Sub
(9 Pin [female])
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
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 becomes
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-
degausser.
5. Perform auto degauss.
6. Attach a wobbling coil to the specified 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
wedges so that [a] is equal to [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.

SECTION 3: ADJUSTMENTS

1
1-690-391-21
2
Mini Din
(8 Pin)
* The Parts above ( ) are necessary for DAS Adjustment.
-
1 3
[a]
[b]
3-702-691-01
3
A-150-919-A
Connector Attachment
Interface Unit
To BUS CONNECTOR
4 Pin
4 Pin 4 Pin
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 specification, 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.

3-3. CONVERGENCE ROUGH ADJUSTMENT

1. Enter the white crosshatch signal.
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
Neck Ass'y
A Board
1. Display crosshatch pattern with green lines and black field.
2. Adjust V. Key (=H. Trapezoid) with H.TRP VR so that [a] is equal
to [b].
3. Adjust the TB Pin with TB Pin VR.
— 11 —
H-TRP VR
TLV VR
Purity
XCV VR
Magnet
CRT
DY
4-pole
6-pole
YCV VR
Mg
Mg
TB Pin VR
TLH Plate
[a]
[b]
HMD-A240R