Master Black Adjustment; Gamma Correction Adjustment - Sony BVP-550 Maintenance Manual

4-2. Adjustment for Installation of OHB

4-2-5. Master Black Adjustment

Equipment
: Waveform monitor
Test point
: TEST OUT connector
Iris of the lens: CLOSE
Preparations:
Connect the waveform monitor to the TEST OUT connec-
tor.
Adjustment procedures:
1. Set the RGB/ENC switch (on the side panel) to RGB.
Set the R/G/B switch (on the side panel) to G.
2. Set the menu as follows, and adjust the black level by
turning the MENU SEL switch.
MENU : Paint
PAGE : Video Level (P1)
ITEM : Black (M)
Specifications: A = 3 ±1 IRE (for NTSC)
A = 35 ±7 mV (for PAL)
(Waveform Monitor)
3. Set the RGB/ENC switch (on the side panel) to ENC.
4. Perform the Auto Black Bal adjustment.
AUTO W/B BAL switch (on the front panel) → BLK
4-10 (E)

4-2-6. Gamma Correction Adjustment

Equipment : Waveform monitor, Vectorscope
Test point
: TEST OUT connector
Object
: Grayscale chart
Preparations:
Connect the waveform monitor to the TEST OUT connec-
tor.
Connect the vectorscope to the PIX OUT terminal on the
waveform monitor.
Shoot the grayscale chart so that the chart frame is aligned
with the underscanned monitor frame.
(Waveform Monitor)
Set the menu as follows.
MENU : Paint
PAGE : Knee/W.Clip (P6)
ITEM : Knee→OFF
RGB/ENC switch (on the side panel) → RGB
R/G/B switch (on the side panel) → G
Adjust the iris control of the lens to satisfy the white level
A.
A = 100 ±2 IRE (for NTSC)
A = 700 ±14 mV (for PAL)
Adjustmnet procedures:
1. Set the RGB/ENC switch (on the side panel) to ENC.
2. Set the menu as follows, and adjust the gamma
correction for (M) by turning the MENU SEL switch.
PAGE : Video Level (P1)
ITEM : Gamma (M)
Specifications: B = 60 ±2 IRE (for NTSC)
B = 420 ±14 mV (for PAL)
(Waveform Monitor)
BVP-550
BVP-550P