Pioneer PDP-502MX Service Manual page 70

PDP-502MX, PDP-502MXE
Adjusting Method
Procedure Adjusting Item
Color-difference
Level adjustment
1
(R–Y LEVEL/
B–Y LEVEL)
SUB CONTRAST/
2
SUB BRIGHTNESS
adjustment
70
Input signal Adjusting Point
REFERENCE 2
in Factory mode
R–Y LEVEL ........
"BS5" Key
Full Field
Color bar signal
REFERENCE 2
in Factory mode
B–Y LEVEL ........
"BS7" Key
SUB VIDEO mode
in Factory mode
SUB CONTRAST.....
SUB BRIGHT .....
ACL. SW ..... .....
"BS5" Key
RAMP signal
R-Y LEVEL adjustment
Observe R-Y color-difference waveform at Pin 3 (INT_Cr) of IC1401
(MATRIX IC) in VIDEO Assy. Adjust R-Y LEVEL so that the point
indicated in the right figure becomes "260mV±15mV".
260±15 mV
B-Y LEVEL adjustment
Observe B-Y color-difference waveform at Pin 4 (INT_Cb) of
IC1401(MATRIX IC) in VIDEO Assy. Adjust B-Y LEVEL so that the
point indicated in the right figure becomes "260mV±15mV".
260±15 mV
SUB BRIGHT / SUB CONTRAST adjustment
1) SUB BRIGHT rough adjustment
Set P. ACL. SW OFF.
"1" Key
Observe signal at Pin3 (RED
SIG.) of IC1701(RGB AMP) in
"2" Key
Video Assy. Adjust so that the
blanking period level of the signal
becomes 0 IRE level.
2) SUB CONTRAST adjustment
Set P. ACL. SW OFF.
Adjust so that 0 to 100 IRE level
of the signal at Pin3 (RED SIG.)
of IC1701 (RGB AMP) becomes
"1.1V".
3) SUB BRIGHT fine adjustment
Set P. ACL. SW ON.
Adjust so that the signal level in
blanking period atPin3 (RED
SIG.) of IC1701 (RGB AMP)
becomes 0 IRE level.
4) Signal level (adjustment value)
confirmation
Set P. ACL. SW ON.
Observe the signal at Pin3 (RED
SIG) of IC1701 (RGB AMP) .
Confirm that the 0 IRE to 100 IRE
level of the signal is "0.9V".
Adjusting Method
SUB BRIGHT
Adjustment
0±20 mV
H Blanking Period
SUB CONTRAST
Adjustment
Signal level (adjustment value)
confirmation
100 IRE
1.1±0.02 V
0 IRE
100 IRE
0.9±0.05 V
0 IRE