Pioneer PDP-4280HD, Service Manual

Page: 126 / 176

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