Pioneer PDP-4280HD Service Manual page 126

1
A
Overview
Preparation
Clearing of the hour meter and pulse meter
Aging with RST MASK 01 (white) displayed
Main flowchart
B
Checking VOL OFFSET_min1
(RST MASK 09: light blue)
OK
Checking VOL OFFSET_min2
(RST MASK 10: light purple)
OK
Checking VOL OFFSET_max1
(RST MASK 13: green 1023+3)
OK
Checking VOL OFFSET_max2
C
(RST MASK 14: blue 1023+3)
OK
Checking Vyknofs3_max1
D
(RST MASK 19: magenta 67)
OK
Adjustment completed
E
Definition of tones for the measuring signals
XGA signal (1024*768)/Video 60-Hz sequence/Dither: ON, L dither: ON, noise: OFF
White RST MASK 01 (R 1023 /G 1023 /B 1023)
Light blue
RST MASK 09 (R 648 /G 1023 /B 1023)
Light purple
RST MASK 10 (R 1023 /G 648 /B 1023)
Green 1023+3
RST MASK 13 (R 137 /G 1023 /B 137)
F
Blue 1023+3
RST MASK 14 (R 137 /G 648 /B 1023)
Magenta 67
RST MASK 19 (R 67 /G 0 /B 67)
126
1
2
Recovery flowchart (1)
(Vsnofs recovery)
Measuring VOL OFFSET_min1
(RST MASK 09: light blue)
OK
Measuring VOL OFFSET_min2
(RST MASK 10: light purple)
NG
OK
Comparing VOL OFFSET_min1 and min2
NG
OK
Measuring VOL OFFSET_max1
(RST MASK 13: green 1023+3)
NG
OK
Measuring VOL OFFSET_max2
(RST MASK 14: blue 1023+3)
NG
OK
Comparing VOL OFFSET_max1 and max2
OK
Determining the final VOL OFFSET value
OK
Recovery flowchart (2)
(Vyknofs recovery)
NG Measuring Vyknofs 3/4/1
(RST MASK 19: magenta 67)
OK
Replacement with the parts
for service
• Re-replacement of the panel
• Replacement of the DRIVE Assy
PDP-4280HD
2
3
Note on voltage calculation
When calculating the setting voltage, round off to
get rid of the fractional part.
NG
Range of margin measuring
Read the voltage within the hysteresis (stricter
NG
value).
V
Erroneous discharge
NG Read the voltage
within this range.
NG
Erroneous discharge
Definition of limits for the voltage margins
(abnormal lit/dead cells)
Abnormal lit cells:
• Five or fewer abnormal cells on the whole screen
NG
• Two or fewer abnormal cells within a radius of 1 cm
Abnormal dead cells
• Fifteen or fewer abnormal cells on the whole screen
• Two or fewer abnormal cells within a radius of 1 cm
∗: Abnormal cells visually recognizable at a distance of
1 meter from the panel must be counted.
NG
∗: Cells displayed abnormally for less than one second
are not counted as abnormal cells.
3
4
Adjustment
value m+1
Adjustment
value m
No erroneous
discharge
Adjustment
value n
Adjustment
value n-1
4