Sony KV-PF21L70 Service Manual ▷ View online
– 28 –
KV-PF21L70/PF21M40/PF21M70/PF21P10
KV-PF21P40/PF21P41/PF21Q70
KV-PF21P40/PF21P41/PF21Q70
RM-952
3-2. CONVERGENCE
Preparation :
•
Before starting this adjustment, adjust the focus, horizontal size
and vertical size.
•
Minimize the brightness setting.
•
Provide dot pattern.
(1)
Horizontal and Vertical Static Convergence
(Moving vertically), adjust the V.STAT magnet so that the red, green
and blue dots are on top of each other at the center of the screen.
R G B
G
R
B
Center dot
C3 board
RV 702
V.STAT Magnet
H. STAT VR
4
BMC (Hexapole) Magnet.
If the red, green and blue dots are not balanced or aligned, then
use the BMC magnet to adjust in the manner described below.
1
V. STAT
2
H. STAT VR
BMC (Hexapole)
V.STAT
Purity
V.STAT
BMC
Purity
R G
B
R
G
B
R
G B
R
B
R
G
G
G
B
R
B
R
R
R
R
G
G
G
G
B
B
B
B
a
a
a
b
b
b
b
R
R
G
G
B
B
a
a
b
b
b
3
– 29 –
KV-PF21L70/PF21M40/PF21M70/PF21P10
KV-PF21P40/PF21P41/PF21Q70
KV-PF21P40/PF21P41/PF21Q70
RM-952
(3) Screen-corner Convergence
b
a
c
d
a-d : screen-corner
misconvergence
misconvergence
a
d
c
b
a to d : Permalloy assembly
Fix a Permalloy assy
corresponding to the
misconverged areas
corresponding to the
misconverged areas
(2) Dynamic Convergence Adjustment
Preparation:
•
Before starting this adjustment, adjust the horizontal static
convergence and the vertical static convergence
R B
TLV
YCH
B
R
on DY
YCH
TLV
– 30 –
KV-PF21L70/PF21M40/PF21M70/PF21P10
KV-PF21P40/PF21P41/PF21Q70
KV-PF21P40/PF21P41/PF21Q70
RM-952
3-3. FOCUS ADJUSTMENT
Adjust FOCUS control on the flyback transformer for the best
focus.
FLYBACK TRANSFORMER (T503)
2. WHITE BALANCE ADJUSTMENT
1) Set to Service Mode (Refer Section 4-1: ADJUSTMENTS
WITH COMMANDER).
2) Input white raster signal.
3) Set the PICTURE to minimum.
4) Select GCT (WHB 4) and BCT (WHB 5) with
[1]
and
[4]
, and
adjust the level with
[3]
and
[6]
for the best white balance.
5) Set the PICTURE to maximum.
6) Select GDR (WHB 1) and BDR (WHB 2) with
[1]
and
[4]
, and
adjust the level with
[3]
and
[6]
for the best white balance.
7) Write into the memory by pressing
[MUTING]
then
[0]
.
3. SUB BRIGHT ADJUSTMENT
1) Set to service mode.
2) Input a staircase signal of black to white from the pattern
generator.
3) BRIGHTNESS .... 50%.
PICTURE ............ MINIMUM
4) Select SBR (WHB7) with
[1]
and
[4]
, and adjust SBR (WHB7)
level with
[3]
and
[6]
so that the second stripe from the right is
dimly lit.
3-4. G2 (SCREEN) AND WHITE BALANCE
ADJUSTMENTS
1. G2 (SCREEN) ADJUSTMENT
1) Set the PICTURE to normal.
2) Put to VIDEO input mode without signals.
3) Connect R, G and B of the C3 board cathode to the oscillo-
scope.
4) Adjust BRIGHTNESS to obtain the cathode voltage to the value
below.
5) Adjust G2 (Screen) on FBT until picture shows the point
before cut-off.
White
second from the right
Black
0 V
175 V ±2(VDC)
FOCUS
SCREEN
– 31 –
KV-PF21L70/PF21M40/PF21M70/PF21P10
KV-PF21P40/PF21P41/PF21Q70
KV-PF21P40/PF21P41/PF21Q70
RM-952
SECTION 4
CIRCUIT ADJUSTMENTS
With the unit on standby
↓
[DISPLAY]
↓
5
↓
VOL (+)
↓
[POWER]
This operation sequence puts the unit into service mode.
4-1. ADJUSTMENTS WITH COMMANDER
Service adjustments are made with the RM-952 that comes with
this unit.
a. ENTERING SERVICE MODE
1, 4
Select the adjustment item.
↓
3, 6
Raise/lower the data value.
↓
[MUTING]
Writes.
↓
-
Executes the writing.
7, -
All the data becomes the values in memory.
8, -
All user control goes to the standard state.
5, -
Service data initialization (Be sure not to use
usually.)
2, -
Write 50Hz adjustment data to 60Hz, or vice
versa.
PAL, SECAM : 50
NTSC : 60
00
HPS
1C
SERVICE
Data
Mode
Item Name
Item No
Software version
Suffix No
(OEM Code)
(OEM Code)
Total Power-On time (hours)
p
Marking of virgin NVM
GEO
1.0C
59
7F
000A
0
623S or
622S
Device Name
50
TV
1
2
3
4
6
7
8
9
÷
0
5
JUMP
SOUND
MODE
FAVORITE
PROGR
Á
RM-952
b. METHOD OF CANCELLATION FROM SERVICE
MODE
Set the standby condition (Press [POWER] button on the commander),
then press [POWER] button again, hereupon it becomes TV mode.
c. METHOD OF WRITE INTO MEMORY
1) Set to Service Mode.
2) Press [1] (UP) and [4] (DOWN), select an item of adjustment.
3) Press [MUTING] button and it will indicate WRITE on the screen.
4) Press [0] button to write into memory.
d. MEMORY WRITE CONFIRMATION METHOD
1) After adjustment, pull out the plug from AC outlet, and then
plug into AC outlet again.
2) Turn the power switch ON and set to Service Mode.
3) Call the adjusted items again to confirm adjustments were made.
The screen display is :
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