Toshiba 20N7XE, Service Manual

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GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
SPEC 4
±
1.5 BARS
6. SUB BRIGHT
(Adjusting signal) SUB Bright (PAL or NTSC) signal
(Adjusting method)
1. Set user control setting to the standard 1.
2. Change BRTC data (Q501 SUB ADDR:01/D7D0) to set black collapse numbers by eye check.
7. WHITE BALANCE ADJUSTMENT
(Adjusting method)
1. Set user control setting to the standard 1.
2. BUS data of Q501
GDRV (Q501 SUB ADDR:09)
→
Initial value (80H)
BDRV (Q501 SUB ADDR:0A)
→
Initial value (80H)
RCUT (Q501 SUB ADDR:0C)
→
Initial value (20H)
GCUT (Q501 SUB ADDR:0D)
→
Initial value (20H)
BCUT (Q501 SUB ADDR:0E)
→
Initial value (20H)
3. Set the mode to the one horizontal line mode
MUTE (Q501 SUB ADDR:1B/D7~D6)
→
H. Line (11)
BRIGHT (Q501 SUB ADDR:01)
→
Initial value (80H)
4. Change SCREEN VR to set it so that one of lines R, G and B will light slightly.
5. Change CUTOFF data to adjust so that each one of R, G and B will light slightly (for about white).
6. Release the H. Line mode.
7. Change B/G drive data and R/G/B CUTOFF data to adjust white balance in bright area and dark area.
NO ADJUSTMENT
8. SECAM BELL FILTER ADJUSTMENT
(Measuring point) Q501 #36 B-Y OUT
(Adjusting signal) Color bar (SECAM) signal
(Adjusting method)
1. Connect resistor 1k ohm between color limiter terminal (Q501 #26) and 5V.
2. Connect resistor 100 ohm between Q501 #35 and 5V.
3. Set COLOR control data to "04H".
4. Set MICOM YS output to "H", and set Q501 to DIGITAL RGB mode.
5. Change BELL data (Q501 SUB ADDR:ifD1D0) to set it so that SECAM signal at #36 pip of
Q501 (B-Y OUT) can be flat.
6. After adjustment, remove resistor 1k ohm between color limiter terminal (Q501 #26).
and 5V, and remove resistor 100 ohm between Q501 #35 and 5V, to return COLOUR control.
data to original.
W
SPEC %
Make flat the white part