9
20U200, 20U250
51U200, 51U250
51U500, 51U550
9-1 9-2
1. Call "SUB-BRI" in service mode. (Receive
Crosshatch pattern with 5 black level windows)
2. Adjust the "SUB BRIGHT" bus data in order
that the line 1, 2 and 3 have the same darkness
wherelse line 4 is slightly brighter than line 1,
2 and 3 and finally line 5 will be the brighter
than line 4.
1. Switch TV to VIDEO mode, BLUE BACK OFF
with NO VIDEO signal.
2. Press R/C to set Picture Normal condition.
3. Connect the oscilloscope to Red OUT from
IC801. (TP851)
Range : 1 V/Div (DC)
Sweep : 5 msec/Div
4. Adjust SCREEN VR, so that the tip of signal
reach 3.0 ±0.1 Vdc.
CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions Waveform and others
1
2 SUB-
BRIGHTNESS
ADJUSMENT
(I
2
C BUS
CONTROL)
1, 2 and 3 are in same black level.
CRT CUTOFF
ADJUSTMENT
(I
2
C BUS
CONTROL)
Fig. 6
3 WHITE
BALANCE
SERVICE
MODE ADJ.
(I
2
C BUS
CONTROL)
1. Receive the "Monoscope Pattern with BURST"
signal.
2. Press R/C to set Picture NORMAL condition.
3. Connect the DC miliammeter between TP602
(-) and TP603 (+).
4. Check Beam current should be around 1,100 µA.
5. Set it to service mode and adjust the " DRI-
GS" & "DRI-BS" data to have a colour
temperature of 12,300°K. (Note.)
6. Receive "White" pattern, with BURST Signal, and
set Brightness Y by generator, to** 10 cd/m
2
(Minolta CA-100) by reducing Luminate Y signal.
7. Adjust "CUT-R" & "CUT-G" to get 12,300°K. Then
go back normal mode (High Bright)** to check
colour temperature. If out of range, back to 1.
Note: This adjustment must be done after
warming up the unit for 30 minutes
or longer with a beam current over
700µA).
* Adjust DRI-GC/GW, DRI-BC/BW as following
data after finishing DRI-GS and DRI-BS.
DRI-GC/GW DATA="DRI-GS" -7 DATA
DRI-BC=DRI-BS
DRI-BW DATA="DRI-BS" -7 DATA
** Low=10 cd/m
2
: High=120 cd/m
2
Refer to Page 7.
* 12,300°K X : 0.272
Y : 0.275
(MINOLTA COLOUR ANALYZER
CA-100)
(Note): Above Data can be UP/
DOWN by Volume key.
4 Maximum
beam check
1. Receive the "Monoscope Pattern" signal.
2. Press R/C to set Picture NORMAL condition.
3. Connect the DC miliammeter between TP603
(+) and TP602 (–).
(Full Scale: 3 mA Range)
4. Beam current must be within 1,100 ±100 µA.
1 V
3.0Vdc
0
1 2 3 4 5
Fig. 7
HORIZONTAL, VERTICAL, DEFLECTION LOOP AND FOCUS ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions Waveform and others
1
2
3
4
5
6
V-SLOPE
(I
2
C BUS
CONTROL)
V-SHIFT
(I
2
C BUS
CONTROL
V-AMP
(I
2
C BUS
CONTROL)
S-CORREC-
TION (I
2
C
BUS CON-
TROL)
H-SHIFT (50)
(H - CENTER)
(I
2
C BUS
CONTROL)
FOCUS
1. Receive "PAL 50Hz Monoscope Pattern"
Signal.
2. Call the "V-LIN" mode.
3. Increase or decrease "V-LIN" by Volume key till
the horizontal line in the center of monoscope is
just at the position where the blanking starts.
1. Call the "V-CENT" mode.
2. Increase or decrease "V-CENT" by Volume key
till the picture is centered.
1. Call the "V-AMP" mode.
2. Increase or decrease "V- AMP" by Volume key
to set overscan of 8.5% typical.
Adjustment Spec 8.5% range +1% -0%.
FIXED DATA, NO NEED TO ADJUST.
1. Call the "H-CENT" mode.
2. Increase or decrease "H-CENT" by Volume key
to center the picture horizontal.
1. Receive the "Monoscope Pattern" signal.
2. Press R/C to set Picture NORMAL condition.
3. Adjust the focus control to get the best
focusing.
PAL CHROMA ADJUSTMENT
NO. Adjustment part Adjusting procedure and conditions Waveform and others
1
SUB COLOUR
(I
2
C BUS
CONTROL)
1. Receive the "PAL Colour Bar" signal.
2. Press R/C to set Picture Normal condition.
3. Connect the oscilloscope to Red cathode
(Between C881 and R885).
» Range : 20 V/div. (AC) (Using 10:1 probe)
» Sweep time : 10 µsec/div.
4. Using the R/C call "SUB COL" in SERVICE
mode. Adjust SUB COLOUR bus data, so that
the 75% White & Red portions of PAL Colour
Bar be at the same level shown as Fig. 8.
5. Clear the SERVICE mode.
Cy
G
B
W
Y 100%W
75%
Mg R
Fig. 8
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