Service manual

1.3.6.2 Circuit (cathode) operation in selecting SB Mode [Window pattern]

1.3.6.3 SB Mode setting data and control method

1.3.7 CONSTANT BRIGHTNESS function

The brightness and color coordination of the screen will be deteriorated due to secular deterioration of the

(OSM FACT3) Data name Data (hex)

SBBR1 0 BRT UP value in SUPER BRIGHT MODE-1 ON "0"=No UP

Setting of back raster

luminance

SBBR2 32 BRT UP value in SUPER BRIGHT MODE-2 ON

SBCN1 3C

Amplified value in SUPER BRIGHT MODE-1 ON

(see the following formula)

Setting of GAIN UP

SBCN2 3C

Amplified value in SUPER BRIGHT MODE-2 ON

(see the following formula)

GAIN UP formula = GAIN adjustment value (hex)(*3) x {1+ (Data (hex) of SBCN1 or SBCN2)/FF (hex) }

(*3): GAIN adjustment value is the following data (in OSM FACT3).

9300K R-GN1 G-GN1 B-GN1

6500K R-GN2 G-GN2 B-GN2

5000K R-GN3 G-GN3 B-GN3

(*4): When the SUPER BRIGHT MODE-1 or MODE-2 is ON, the GAIN cannot be adjusted as shown in the

table in Sec. 1.3.6.1 "Adjustment item/operating function in selecting SB Mode". However, when the

SUPER BRIGHT MODE is OFF, the MAX GAIN value calculated with the following formula will be written in

the following EEP address so that the GAIN value cannot be increased above that of the SUPER BRIGHT

MODE-1 and MODE-2 ON status.

MAX GAIN = Maximum value (hex) for R/G/B GAIN adjustment (Note 5) x {1 + (SBCN1 or SBCN2 data

(hex))/FF (hex)}

(*5): R/G/B GAIN MAX value is the maximum one among GAIN adjustment value mentioned (*3) above.

EEP address (hex)

R G B

MAX GAIN 89 8a 8b

* Every R/G/B MAX GAIN data applied to the address listed above table are totally same.

In case of repair, after CRT, Pre-AMP (IC211), MAIN-AMP (IC210), etc. are replaced and the

luminance/color coordination is adjusted, the MAX GAIN value mentioned above should be rewritten.

Same amplitude

Amplitude: Approx. 36V

Amplitude: Approx. 44V

ccordance

SUPER BRIGHT MODE-1

SUPER BRIGHT MODE-2

SUPER BRIGHT MODE

GND