White Balance Adjustment - Pioneer PDP-501MX Service Manual

Procedure Adjusting Item
V , V , V ,
SUS OFS ADR
V , V voltage
10
CSP RN
adjustment
If the U-COM assembly has been replaced, mount the former EEPROM (IC3704 24LC64 (I) SN) in the new U-COM assembly.
Note: CSP, GNDH_A, and GNDH_B differ from the GND potential in the unit. The GND potentials are also different each other.
• The adjustment tolerance of the drive voltage label is
• The adjustments of the ANALOG VIDEO ASSEMBLY (step 1), (step 2), (step 3), (step 4), (step 5), and (step 6) is not necessary when
replacing this assembly.
• Adjusting points which need not be adjusted again in the unit after replacing other assemblies are as follows.
SW power supply
• If the above adjustment controls are rotated by mistake, adjust to the following values;
RV8 (+5V): Adjust the DC voltage between TP CH16 (5V) and TP CH19 (5V GND) to 5.0V
RV6 (+3.3V): Adjust the DC voltage between TP CH17 (3.3V) and TP CH19 (5V GND) to 3.3V
RV2 (+12V): Adjust the DC voltage between TP CH18 (12V) and TP CH19 (5V GND) to 12.0V
RV1 (+5VSTB): Adjust the DC voltage between TP CH4 (5V) and TP CH19 (5V GND) to 5.0V

6.2 White Balance Adjustment

Set COLOUR to minimum and the other video settings to the
standard setting in the following measurements.
1. Black level adjustment
1) Input the RAMP signal.
2) Monitor the output TP terminals of the RGB assembly (R:P5802,
G:P5801, B:P5803), and adjust R,G,B LOW LIGHT so that the
black level (0IRE) becomes 2.6V.
2. LOW LIGHT adjustment
Input the RAMP signal, and adjust R, G, B:LOW LIGHT so that
the point which starts to light up becomes gray.
3. HIGH LIGHT adjustment
1) Input the RAMP signal.
2) Monitor the TP terminals of the RGB assembly (R:P5802,
G:P5801, B:P5803), and adjust R,G,B HIGH LIGHT so that the
white level (100IRE) becomes 4.4V.
3) Input the white signal (80IRE).
4) Adjust R,G,B HIGH LIGHT so that the screen becomes reddish
white (T=7200K, dev=0.000uv).
4. Adjusting voltage check
Input the RAMP signal, monitor the TP terminals of the RGB
assembly (R:P5802, G:P5801, B:P5803), and check that the black
±
level (0IRE) is 2.6V 0.1. The white level (100IRE) value is not
specified.
Input Signal Adjusting Point
RV7, RV5,
RV3, RV4,
100% white signal
RV9 (
±
0.5V.
RV8 (+5V)
RV6 (+3.3V)
RV2 (+12V)
RV1 (+5VSTB)
V (Sustain power supply voltage)
SUS
Check the drive voltage label value at the upper left side of the
unit inside, and adjust RV7 so that the value between TP CH24
(175V) and TP-CH25 (175 GND) becomes that value.
V (Offset power supply voltage)
OFS
Check the drive voltage label value at the upper left side of the
unit inside, and adjust RV5 so that the value between Pin 1 of
CN3106 (150V) and Pin 4 of CN3105 (SUS, GND) inside the Y
drive assembly becomes that value.
V (Address power supply voltage)
ADR
)
J
Check the drive voltage label value at the upper left side of the
unit inside, and adjust RV3 so that the value between TP CH22
(30V) and TP-CH23 (30V GND) becomes that value.
V (CSP power supply voltage)
CSP
Check the drive voltage label value at the upper left side of the unit
inside, and adjust RV4 so that the potential between Pin 4 (CSP)
and Pin 1 (150V) of CN3106 of the Y drive assembly becomes
that value.
V (Minus reset power supply voltage)
RN
Check the drive voltage label value at the upper left side of the
unit inside, and adjust RV9 so that the value between TP CH26
(190V) and TP CH25 (175 GND) becomes that value.
(Reference)
Adjustment values using the Minolta colour-difference meter
CA-100
80% window step 0dB
[NTSC] [HDTV]
x=300
y=315
±
2
Y=58 15cd/m
20% 4.0cd/m 2 (NTSC)
2
3.0cd/m (HDTV)
Checking picture quality
1. Face colour check (Colour balance check)
After adjusting the white balance, check the face colour of figures
in LD still pictures.
If the colour is not natural, adjust COLOUR and TINT and
memorize the value.
2. Picture quality check
Set the sharpness to 120 for both NTSC and HDTV, and the detail
setting to 70 for NTSC and 65 for HDTV, and check the picture
quality.
Note: Adjust the white balance and check the picture quality in each
NTSC screen mode (natural wide, zoom, etc.) and HDTV
(MUSE).
PDP-501MX, PDP-V501X
Adjusting Method
±
0.1V.
±
0.066V.
±
0.24V.
±
0.1V.
[RGB]
x=290
y=315
±
2
Y=35 10cd/m (20% 2.5cd/m
2
)
39