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CONVERGENCE ADJUSTMENT
NO. Adjustment part
Adjusting procedure and conditions
1
CONVERGENCE
1. Receive the "Crosshatch Pattern" signal.
ADJ.
2. Using the remote controller, call NORMAL
(To be done
mode.
after the purity
adjustment.)
Static convergence
1. Turn the 4-pole magnet to a proper opening
angle in order to superpose the blue and red
colours.
2. Turn the 6-pole magnet to a proper opening
angle in order to superpose the green colour
over the blue and red colours.
Dynamic convergence
1. Adjust the convergence on the fringes of the
screen in the following steps.
a) Fig. 5-1: Drive the wedge at point "a" and
swing the deflection coil upward.
b) Fig. 5-2: Drive the wedge at points "b"
and "c" and swing the deflection coil
downward.
c) Fig. 5-3: Drive the "c" wedge deeper and
swing the deflection coil rightward.
d) Fig. 5-4: Drive the "b" wedge deeper and
swing the deflection coil leftward.
2. Fix all the wedges on the CRT and apply glass
tape over them.
3. Apply lacquer to the deflection yoke lock screw,
magnet unit (purity, 4-pole, 6-pole magnets)
and magnet unit lock screw.
Finally received the Red-only and Blue-only
signals to make sure there is no other colours
on the screen.
Waveform and others
BGR
Fig. 5-1
RGB
Fig. 5-2
RGB
B
G
R
Fig. 5-3
BGR
R
G
B
Fig. 5-4
Wedge "a"
About
100°
Lacquer
Wedge
"b"
Fig. 5-5
4-pole magnet
6-pole magnet
CRT neck
Lacquer
20mm
Purity magnet
Fig. 5-6
8-1
CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT
NO. Adjustment part
Adjusting procedure and conditions
1
CRT CUTOFF
1. Switch TV to VIDEO mode, BLUE BACK OFF
ADJUSTMENT
with NO VIDEO signal.
(I
2
C BUS
2. Press R/C to set Picture Normal condition.
B
CONTROL)
3. Connect the oscilloscope to Red OUT from
G
IC801.(TP852)
R
4. Adjust SCREEN VR, so that the tip of signal
R
reach 3.0 +0.1 Vdc.
G
B
2
SUB-
1. Call "SUB-BRI" in service mode. (Receive
BRIGHTNESS
Crosshatch pattern with 5 black level windows)
ADJUSMENT
2. Adjust the "SUB BRIGHT" bus data in order
(I
2
C BUS
that the line 1, 2 and 3 have the same darkness
CONTROL)
wherelse line 4 is slightly brighter than line 1,
2 and 3 and finally line 5 will be the brighter
than line 4.
3
WHITE
1. Receive the "WHITE" Pattern with BURST
BALANCE
signal.
SERVICE
2. Press R/C to set Picture NORMAL condition.
MODE ADJ.
3. Connect the DC miliammeter between the
(I
2
C BUS
TP602 (-) and TP603 (+).
CONTROL)
4. Check Beam current should be around 1,100 µA.
5. Set it to service mode and adjust the " WPG"
(White Point-G), "WPB" (White Point-B) data
to have a colour temperature of 12,300°K
(white). * Note .
6. Receive "White" pattern, with BURST Signal, and
set Brightness Y by generator, to ** 10 cd/m
(Minolta CA-100) by reducing Luminate Y signal.
About
7. Adjust "CUT-R" & "CUT-G" to get 12,300°K. Then
100°
go back normal mode (High Bright)** to check
colour temperature. If out of range, back to (1).
Note: This adjustment must be done after
Wedge
"c"
* Adjust DRI-GC/GW, DR-BC/BW as following
data, after finishing DRI-GS and DRI-BS:
DRI-GC=DRI-GW="DRI-GS"-7: DRI-BW="DRI-BS"-7:
DRI-RC=25: DRI-BC=DRI-BS: DRI-RW=32
** Low=10cd/m
4
Maximum
1. Receive the "Monoscope Pattern" signal.
beam check
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.
Waveform and others
3.0Vdc
Range
: 1 V/Div (DC)
Sweep
: 5 msec/Div
0
1 2 3 4 5
1, 2 and 3 are in same black level.
* 12,300°K
(MINOLTA COLOUR ANALYZER
CA-100)
*Note: Above Data can be UP/
2
warming up the unit for 30 minutes
or longer with a beam current over
700µA.
2
: High=120cd/m
2
8-2
1 V
Fig. 6
Fig. 7
X : 0.272
Y : 0.275
DOWN by Volume key.
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