Gamma Correction Adjustment - Sony BVP-500 Maintenance Manual

5-16. Gamma Correction Adjustment

Equipment : Waveform monitor,
Vectorscope
Test Point : MONITOR connector
Object
: Grayscale chart
Preparations:
• Connect the waveform monitor to the MONITOR
connector.
• Connect the waveform monitor to the PIX OUT terminal
of the vectorscope.
• KNEE OFF button/MSU operation panel → OFF (Lights)
• GAMMA OFF button/MSU operation panel → ON
(Stays out)
• S650 (MONITOR SELECT)/IF-538 panel → VBS
• Shoot the grayscale chart so that the chart frame is
aligned with the underscanned monitor frame.
: A = 100 ±2 IRE (for NTSC)
Iris of the lens
A = 700 ±14 mV (for PAL)
Adjustment Procedures:
1. S650 (MONITOR SELECT)/IF-538 panel → VF
G button/rear panel → ON
2. Adjust the master gamma. Proceed as follows.
MSU menu operation:
• PAINT button → ON (Lights)
• Touch panel operation
∆ → (Page 2/3) → Gamma
Adjustment Item : Master
: B = 55.5 ±2.0 IRE (for NTSC)
Specifications
B = 420 ±14 mV (for PAL)
(Waveform Monitor)
3. Close the lens iris.
4. TEST 1 button/MSU operation panel → ON (Lights)
S650(MONITOR SELECT)/IF-538 panel → VBS
5. Adjust the auto white balance.
WHITE button/MSU operation panel → ON (Lights)
BVP-500
BVP-500P
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6. Adjust the R gamma. Proceed as follows.
MSU menu operation:
• PAINT button → ON (Lights)
• Touch panel operation
∆ → (Page 2/3) → Gamma
Adjustment Item : R
Specifications
7. Adjust the B gamma. Proceed as follows.
MSU menu operation:
• PAINT button → ON (Lights)
• Touch panel operation
∆ → (Page 2/3) → Gamma
Adjustment Item : B
Specifications
8. Repeat the steps 6 and 7 alternately, until the beam
spot is minimized on the vectorscope.
5-16. Gamma Correction Adjustment
: Center the beam spot on the
vectorscope.
: Center the beam spot on the
vectorscope.
M
G
R
Y
L
B
G
C
Y
(For NTSC)
R
M
G
Y
L
B
G
C
Y
(For PAL)
(Vectorscope)
5-21