Sony KV-XF25N90 Service Manual ▷ View online
– 29 –
KV-XF25N90
RM-914
(3) Screen-corner Convergence
b
a
c
d
a-d : screen-corner
misconvergence
misconvergence
Fix a Permalloy assy corresponding to the misconverged
areas.
areas.
a
b
c
d
Permalloy assembly
3-3. FOCUS ADJUSTMENT
Adjust FOCUS control on the flyback transformer for the best
focus.
FLYBACK TRANSFORMER (T503)
Screen
Focus
TLV
Rotate
TLV-2 VOL (29”, 34”) on DY
Rotate
TLV
VOL (25”) on DY
XCV
Rotate
XCV
Adj core on DY
YCH
Rotate
YCH
VOL on DY
TLH
Insert
TLH
Correction Plate to DY Pocket (Left or
Right)
ON DY:
YCH
XCV
TLV1
TLV2
– 30 –
KV-XF25N90
RM-914
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 C board cathode to the oscilloscope.
4) Adjust BRIGHTNESS to obtain the cathode voltage to the value
below.
5) Adjust G2 (screen) on the FBT until picture shows the point
before cut off.
White
second from the right
Black
0 V
Cathode setting voltage:
175 V ±2(VDC)...34",25",21"
180V ±2(VDC)...29"
175 V ±2(VDC)...34",25",21"
180V ±2(VDC)...29"
– 31 –
KV-XF25N90
RM-914
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-914 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
601S
Device Name
50
1
4
7
2
5
8
0
3
6
9
FAVORITE
SOUND
MODE
PIC MODE
RETURN
MENU
WAKE UP
SLEEP
CABLE
AUTO
PROGRAM
ADD/ERASE
SURROUND
MTS
VIDEO
TV
POWER
DISPLAY
MUTING
RM-914
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 :
– 32 –
KV-XF25N90
RM-914
4-2. ADJUSTMENT METHOD
Item Number 00 of device GEO
This explanation uses H-Position as an example.
1. Select “GEO 00 HPS” with the 1 and 4 buttons.
2. Raise/lower the data with the 3 and 6 buttons.
3. Select the optimum state. (The standard is 1F for PAL reception.)
4. Write with the
[MUTING]
button. (The display changes to
WRITE.)
5. Execute the writing with the - button. (The WRITE
display will be changed to red color while excuting, and back
to SERVICE.)
Use the same method for all Items. Use 1 and 4 to select the
adjustment item, use 3 and 6 to adjust, write with
[MUTING]
,
then execute the write with -.
Note : 1. In
[WRITE]
, the data for all items are written into memory
together.
2. For adjustment items that have different standard data
between 50Hz or 60Hz, be sure to use the respective
input signal after adjustment.
1F
SERVICE 50
HPS
Adjusted with
[3]
and
[6]
buttons.
GREEN
Written with
[MUTING]
Write executed with
[0]
GEO
00
7F
0
000A
59
601S 1.0C
1F
SERVICE 50
HPS
RED
The WRITE display
then the display
returns to a green
SERVICE.
The WRITE display
then the display
returns to a green
SERVICE.
GEO
00
7F
0
000A
59
601S 1.0C
1F
WRITE
50
HPS
GREEN
GEO
00
7F
0
000A
59
601S 1.0C
Click on the first or last page to see other KV-XF25N90 service manuals if exist.