Sony KV-21V4A Service Manual ▷ View online
– 29 –
3-3. SCREEN (G2), DRIVE, WHITE BALANCE,
SUB COLOR and SUB BRIGHTNESS.
Screen (G2) setting
1.
Input a 0 IRE (Black Level) signal from the pattern
generator.
generator.
2.
Enter into the Service Mode "ON SCREEN DIS" "DIGIT 5"
"VOLUME +" "TV" then select “ G2 ” with “ 1 ” or “ 4 ” key.
"VOLUME +" "TV" then select “ G2 ” with “ 1 ” or “ 4 ” key.
3.
Adjust RV703 until the Down arrow is displayed.
4.
Adjust RV703 until the Down arrow just disappears.
5.
Press the TV Button on the Remote Commander to store
the data.
the data.
Drive Level
1.
Input a Video signal containing a small area of 100%
white on a black background.
white on a black background.
2.
Connect an oscilloscope to Pin 7 of J701 (R OUT)
on the C Board.
on the C Board.
3.
Set the Picture to maximum.
4.
Enter into the Service mode.
5.
Using the "1" and "4" buttons select "RIN".
6.
Using the "3" and "6" buttons on the Remote Commander
adjust until the oscilloscope waveform has
an amplitude of 95V.
adjust until the oscilloscope waveform has
an amplitude of 95V.
White Balance Adjustment
1.
Input an all white pattern from the pattern generator.
2.
Adjust the Color and Brightness controls to the standard
level.
level.
3.
Enter into the Service Mode.
4.
Adjust the "GIN" and "BIN" so that the
White Balance becomes optimum.
White Balance becomes optimum.
95V
Sub Color Adjustment
1.
Input a PAL color bar pattern from the pattern generator.
2.
Connect an oscilloscope to Pin 5 of J701 (B OUT)
on the C Board.
on the C Board.
3.
Enter into the Service Mode "ON SCREEN DIS" "DIGIT 5"
"VOLUME +" "TV" then select “ G2 ” with “ 1 ” or “ 4 ” key.
"VOLUME +" "TV" then select “ G2 ” with “ 1 ” or “ 4 ” key.
4.
Using the "3" and "6" buttons on the Remote
Commander adjust until the oscilloscope waveform
becomes as follows :
Commander adjust until the oscilloscope waveform
becomes as follows :
Note : If the TV is able to receive PAL and SECAM
transmissions, repeat the above procedure using a SECAM
color bar signal.
transmissions, repeat the above procedure using a SECAM
color bar signal.
Sub Brightness Adjustment
1.
Input a Philips pattern from the pattern generator.
2.
Enter into the Service Mode "ON SCREEN DIS" "DIGIT 5"
"VOLUME +" "TV" then select “ G2 ” with “ 1 ” or “ 4 ” key.
"VOLUME +" "TV" then select “ G2 ” with “ 1 ” or “ 4 ” key.
3.
Using the "3" and "6" buttons on the Remote Commander
adjust until the 0 IRE of the grey scale and the cut off are
only slightly visible on the screen.
adjust until the 0 IRE of the grey scale and the cut off are
only slightly visible on the screen.
4.
You must write all adjusted data in service mode as following
procedure Push " " then "0" by remote commander.
procedure Push " " then "0" by remote commander.
3-4. FOCUS
Adjust the FOCUS control RV704 so that the whole screen is in
best focus.
best focus.
B. OUT
SAME LEVEL
RV703
C board
FOCUS
SCREEN
– 30 –
4-1. ELECTRICAL ADJUSTMENTS
Service adjustment to this model can be performed
with the supplied Remote Control Commander RM-C801,
C802, C803.
with the supplied Remote Control Commander RM-C801,
C802, C803.
HOW TO ENTER INTO SERVICE MODE
1.
Turn on the main power of the set and enter into
stand-by mode.
stand-by mode.
2.
Press the following sequence of buttons on the Remote
Control Commander.
Control Commander.
"Service mode" will appear in the top right corner of the
screen Other status information will also be displayed.
screen Other status information will also be displayed.
3.
Press the "1" or "4" buttons to select the adjustment item
from the table.
from the table.
4.
Press the "3" or "6" buttons to change the data
as required.
as required.
5.
Turn off the power to quit the service mode when
adjustments are completed.
adjustments are completed.
5
+
+
(ON SCREEN
DISPLAY)
DISPLAY)
(DIGIT 5)
(VOLUME
+
)
(TV)
00
0DL
01
SERVICE
No
DISP DATA
Range of adjustments available from the on screen menu
system.
system.
DATA
DATA
No. DISP
(Range)
Standard
Item
BIT
(HEX)
(HEX)
00 ODL
00~FF
08
Power On Delay
0~7
01 OSH
00~3F
02
On Screen H-posi.
0~5
02 MUT
00~01
01
FTZ Muting On
0
03 VAM
00~3F
1A
V. SIZE
0~5
04 VBC
00~3F
00
V-Breath Correct.
0~5
05 PAM
00~3F
00
Parabola Amp.
0~5
06 PTI
00~3F
20
Parabola Tilt
0~5
07 VLI
00~3F
28
V-Linearity
0~5
08 CCR
00~3F
00
Corner Correction
0~5
09 HAM
00~3F
15
V. CENT
0~5
10 VPO
2A (Fix)
32
V-Position
0~5
11 HPH
00~3F
29
H. CENT
0~5
12 BIN
00~3F
12
Blue Intensity
0~5
13 GIN
00~3F
14
Green Intensity
0~5
14 RIN
00~3F
16
Red Intensity
0~5
15 CLS
00~04
00
Color System
0~7
16 SCO
00~0E
0A
Sub Contrast
0~5
17 SBR
00~0E
03
Sub Brightness
0~5
18 SSA
00~04
02
Sub Saturation
0~5
19 SHU
00~04
02
Sub Hue
0~5
20 SSH
(Fix)
07
Sub Sharpness
0~5
21 G2 ADJ
read only
—
G2 Adjustment
6~7
22 32K ADJ
Clock
*
*
*
*
*
*
*
*
*
Note
*
Mark ...... Don't adjust the Service Menu.
SECTION 4
CIRCUIT ADJUSTMENTS
– 31 –
V, LINEAR
VERT, AMPL
V, CENTRE
H, CENTRE
H, SIZE
4 3 2 1
CN804
Too Small
Normal position
Fit the link as required to obtain the correct horizontal picture
size. Remove the link if the H, SIZE is to large.
size. Remove the link if the H, SIZE is to large.
PLL ADJUSTMENT ( ALL DESTINATIONS)
1.
Input a 38.9MHz 100dB
µ
CW signal at the IF Out
injection point.
2.
Connect a digital voltmeter to IC101 pin 23 .
3.
Adjust T101 AFT for 2.5V
±
0.3V dc.
TU AGC ADJUSTMENT (ALL DESTINATIONS)
1.
Input a RF signal.
2.
Adjust RF level of 64db
µ
V on E-54ch. (In case of System
B/G, other system is same ch.)
3.
Select ch to E-54.
4.
Adjust RV101 so that AGC voltage to 3.0
±
0.3V.
1.
Enter into the service mode.
2.
Using the "1" or "4" buttons select the Adjust item.
3.
Press the "3" button to enter the adjustment
submenu.
4.
Select and adjust each item in order to obtain the
optimum image.
DEFLECTION SYSTEM ADJUSTMENT
V, SIZE
1A
00 - 3F
VER, BREATH
14
00 - 3F
PAR, AMPL
00
00 - 3F
PAR, TILT
00
00 - 3F
V, LINEAR
28
00 - 3F
CORN, CORR
00
00 - 3F
V, POSITION
32
2A (Fix)
H, CENTRE
29
00 - 3F
Adjustment
Set
Range
1.
Input a 38.9MHz, 100dB
µ
CW signal at the IF out
injection point (SF101 pin 1 .)
2.
Connect a digital voltmeter to IC101 pin 23 .
3.
Adjust RV102 so that voltage to 3.0 V
±
0.3V dc.
L SYSTEM ADJUSTMENT (B MODEL ONLY)
– 61 –
SECTION 2
CIRCUIT ADJUSTMENTS
Necessary items and indications for total adjustment of electric
circuit of this unit will be described in this chapter.
circuit of this unit will be described in this chapter.
[ Instruments to be Used ]
1) Color TV
2) Signal or dual trace type oscilloscope, band more than
2) Signal or dual trace type oscilloscope, band more than
30 MHz, delay, as provided.
3) Frequency counter (4 digits or more)
4) PAL pattern generater
5) Digital voltmeter
6) Audio level meter
7) Audio generator
8) Attenuator
9) Distortion meter
4) PAL pattern generater
5) Digital voltmeter
6) Audio level meter
7) Audio generator
8) Attenuator
9) Distortion meter
10) Alignment tape
Part code : H7099052H (MH-2)
[ Connection ]
Unless otherwise specified, connect and adjust the measurement
equipment as follows.
equipment as follows.
[ Set-up for adjustment ]
The video signal from the pattern generator is used as adjustment
signal for electrical adjustment. This video signal should meet
the requirement. Connect the oscilloscpe to the video input
terminal on the MF 1 board and make sure that the amplitudes
of sync signal of video signal, video portion and burst signal are
flat at approximately 0.3, 0.7 and 0.3 V, respectively, and that
the level ratio of the burst signal and “red siganl” are 0.30 : 0.66,
Fig. 2-2. shows video signals (color bars) used in adjusting the
electrical adjustment.
signal for electrical adjustment. This video signal should meet
the requirement. Connect the oscilloscpe to the video input
terminal on the MF 1 board and make sure that the amplitudes
of sync signal of video signal, video portion and burst signal are
flat at approximately 0.3, 0.7 and 0.3 V, respectively, and that
the level ratio of the burst signal and “red siganl” are 0.30 : 0.66,
Fig. 2-2. shows video signals (color bars) used in adjusting the
electrical adjustment.
Burst signal
(To be flat)
(To be flat)
Red
Horizontal sync signal
White (approx. 100%)
Approx.
0.3V
Approx.
0.7V
Approx.
0.3V
Fig. 2-2
Alignment Tape (MH-2)
Time
Video signal
Audio signal
1
10 minutes
Starir-step
6 kHz
2
5 minutes
–
3 kHz
3
10 minutes
Color bar
1 kHz
4
3 minutes
RF sweep
–
Pattern generator
VIDEO LINE OUT (75 )
Fig. 2-1.
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