Focus Adjustment (Rough Adjustment); Shock Test; Preadjustment Before Aging - NEC DPro2070SB Service Manual

2.4.2.2

FOCUS adjustment (Rough adjustment)

(1) Set the brightness so that the raster can be confirmed with the FBT picture potentiometer
(screen VR).
(2) Adjust the focus pack "FOCUS 1, 2" so that both edges of the picture are clear.
2.4.2.3

Shock test

(1) Display the "color bar" with the signal generator A.
(2) Confirm that there is no abnormality in the image when shock is applied on the monitor.
2.4.2.4

Preadjustment before aging

(1) Change to FACTORY MODE (aging mode) in advance.
(2) Display a full white with the signal generator A.
(3) Confirm that the R, G and B channel images are output.
(4) Confirm that the picture position, picture size, PCC and balance can be controlled, and
roughly adjust.
(5) Adjustment of BTCEN (BRIGHT-CENT), BTMAX (BRIGHT-MAX), BS1 (BIAS-H)
a) Input timing No. 12 (1600x1200 106.25K/85) with the signal generator (R, G and B
OFF).
b) Set each adjustment item to the following value.
BRIGHTNESS
(FACT3)
R-BS1(R-BIAS-H)
G-BS1(G-BIAS-H)
B-BS1(B-BIAS-H)
BTCEN (BRIGHT-CENT)
BTMAX (BRIGHT-MAX)
c) Connect PWB-CRT TP (R200G lead wire) to the probe.
d) Select BTCEN (BRIGHT-CENT) in FACT3, set the black level voltage of PWB-CRT TP
(R200G lead wire) to 70 +/- 0.5V with the oscilloscope (refer to the following picture).
* In use of the digital voltage meter, set it to 73 +/- 0.5V.
70±0.5V
e) Set the back raster luminance to 0.5 +/- 0.3 cd/cm
f) Adjust the back raster color coordination to the following value with R-BS1 (R-BIAS-H)
and B-BS1 (B-BIAS-H).
x: 0.283±0.02 / y: 0.297±0.02
* Do not adjust BTCEN (BRIGHT-CENT) after the adjustment of back raster color coor-
dination carried out at f) above, but it can be adjusted in main adjustment mentioned
after 2.4.3.
* BRIGHTNESS should be adjusted when the back raster is varied in adjustment of
purity and convergence.
(6) Confirm that OSM power management is OFF.
(7) Disconnect the signal and confirm that the following picture appears on OSM. Then adjust
OSM picture luminance with BRIGHTNESS adjustment, and carry out heat run for 60
minutes or more.
: 7F
: 00
: 8A
: 00
: 5E0
: 800
2 - 8
G-K
GND
2
with BRIGHTNESS adjustment.