Adjusting Method - Pioneer PDP-502MX Service Manual

PDP-502MX, PDP-502MXE

Adjusting Method

Procedure Adjusting Item
Color-difference
Level adjustment
1
(R–Y LEVEL/
B–Y LEVEL)
(502MX only)
SUB CONTRAST/
2
SUB BRIGHTNESS
adjustment
54
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 K2417 in Video
Assy. Adjust so that the blanking
"2" Key
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 K2417 in Video
Assy becomes "0.8V".
3) SUB BRIGHT fine adjustment
Set P. ACL. SW ON.
Adjust so that the signal level in
blanking period at K2417 in Video
Assy becomes 0 IRE level.
4) Signal level (adjustment value)
confirmation
Set P. ACL. SW ON.
Observe the signal at K2417 in
Video Assy .
Confirm that the 0 IRE to 100 IRE
level of the signal is "0.58V".
Adjusting Method
SUB BRIGHT
Adjustment
0±20 mV
H Blanking Period
SUB CONTRAST
Adjustment
Signal level (adjustment value)
confirmation
100 IRE
0.8±0.02 V
0 IRE
100 IRE
0.58±0.05 V
0 IRE