Section 3: Adjustments; Landing Rough Adjustment; Landing Fine Adjustment - HP P4819 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. Set contrast to 255.
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 the DY tilt.
NOTE: Set ROTATION to 128 and LCC_NS to 128 when adjusting
the DY tilt.
6. Lightly tighten the DY screw.

3-2. LANDING FINE ADJUSTMENT

NOTE: (1) After adjusting W/B (9300k), measure the average of ΣΙΚ
with all white video input, while CONTRAST is maximum
and BRIGHTNESS is centered. Make the adjustments so
that the miss-landing becomes least after aging 2H with
the ΙΚ 30% of measured value shown above.
(2) The magnetic field shall be BH = 0.
(3) When adjusting at other than BH = 0, calculate the shifted
value from BH = 0.
1. Place the monitor in the Helmholtz coil.
2. Set as follows;
LCC-SW = 0 (LCC Correction Current = 0)
FUNCTION_SW bit1 = (Auto Degauss = On)
CONTRAST = 255
3. Display plain green pattern.
4. Degauss the iron part of the chassis with a hand-degausser and
degauss coil.
5. Degauss the CRT face with degauss equipment or hand-degausser.
6. Input AC 230V to AC IN and turn the monitor off and on to activate
the auto degausser.
7. Reset FUNCTION_SW bit 1 to 0 (auto-degauss = off)
8 Repeat step 5 by degaussing the CRT face with degauss equipment
or hand-degausser.

SECTION 3: ADJUSTMENTS

1
1-690-391-21
2
Mini Din
(8 Pin)
* The Parts above ( ) are necessary for DAS Adjustment.
~
1 3
3-702-691-01
3
A-1500-819-A
Connector Attachment
Interface Unit
BUS CONNECTOR
4 Pin
4 Pin
4 Pin
9. Attach a wobbling coil to the specified position of CRT neck.
10. Put on landing sensor to CRT face.
11. Set LCC_SW to 12.
12. With landing checker, adjust DY position, purity, DY center and the
landing of the 4 corners.
13. Read VX and VY values which are read out of the magnetic sensor,
and write to LCC_VX_REF and LCC_VY_REF.
14. Adjust landing by LCC_NS, LSS_LT, LCC_LB, LCC_RT, and
LCC_RB. Adjustment of registers shall be limited within the
following range:
LCC_NS: 128 ± 15
LCC_LT, LCC_LB, LCC_RT, and LCC_RB: 128 ± 40
Set LCC_SW to 13, and Perform Service Save.
<Specifications>
Adjust so that the green is within
the specification given right.
4 corner adjust target : within ± 1
The red and blue must be within
the specification given right with
respect to the green.
A difference between red and blue
must be within the specification
given right.
15. Tighten DY screw within specified torque, and auto-degauss.
NOTE: Torque 22 ± 2 kgcm (2.2 ± 0.2 Nm)
— 16 —
To
0 ± 3 0 ± 7.5 0 ± 3
0 ± 3 0 ± 7.5 0 ± 3
0 ± 3 0 ± 7.5 0 ± 3
± 6
± 6
± 6
10
10
10
P4819
(µm)
(µm)
± 6 ± 6
± 6 ± 6
± 6 ± 6
(µm)
10 10
7 10
10 10