Sony KV-J25MN1AK Service Manual ▷ View online
– 17 –
KV-J25MN1AK
RM-883
3. Move the deflection yoke as shown in the figure below and
optimize the convergence.
4. Tighten the deflection yoke screws.
5. Install the deflection yoke spacer.
(3) Screen-corner Convergence
b
a
c
d
a-d : screen-corner
misconvergence
misconvergence
(2) Dynamic Convergence Adjustment
Preparation :
•
Before starting this adjustment, adjust the horizontal static
convergence and the vertical static convergence.
1. Slightly loosen the deflection yoke screws.
2. Remove the deflection yoke spacer.
R G B
R G B
R G B
R G B
B G R
B G R
B G R
B G R
R
G
B
B
G
R
B
G
R
R
G
B
a
b
c
d
Permalloy assembly
Fix a Permalloy assy corresponding to the misconverged areas.
– 18 –
KV-J25MN1AK
RM-883
3-3. FOCUS ADJUSTMENT
Adjust FOCUS control on the flyback transformer for the best
focus.
a. AN ITEM OF ADJUSTMENT
b. METHOD OF CANCELLATION FROM SERVICE
MODE
Set the standby condition (Press
POWER
button on the
commander) and then press
POWER
button again, hereupon it
becomes TV mode.
c. METHOD OF WRITE FOR MEMORY
1) Set to Service Mode.
2) Press 1 (UP) and 4 (DOWN) to select an item of adjust-
ments.
3) Press
MUTING
button and it will indicate WRITE on screen.
4) Press - 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, confirm they were adjusted.
Note
Initial DATA
09
RDR
28
WHITE POINT R
0A
GDR
20
WHITE POINT G
0B
BDR
20
WHITE POINT B
3-4. G2 (SCREEN) AND WHITE BALANCE
ADJUSTMENTS
1. G2 (SCREEN) ADJUSTMENT (RV701)
1) Set the PICTURE and BRIGHTNESS 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 G2 (RV701) volume to the value below.
2. WHITE BALANCE ADJUSTMENTS
1) Set to Service Mode.
2) Input an entire white signal.
3) Set the PICTURE to maximum.
4) Select RDR(09) with 1 and 4 , and then set the level to 28
with 3 and 6 .
5) Select GDR(0A) and BDR(0B) with 1 and 4 and adjust
the level with 3 and 6 for the best white balance.
6) Write into the memory by pressing
MUTING
, then - .
SERVICE
MUTING
1 F
DATA
RDR
Adjustment Item
09
Item number
WRITE
1 F
RDR
09
0
Executes the writing
Item
number
number
Adjustment
item
item
0 V
180
±
2 V DC
Focus
– 19 –
KV-J25MN1AK
RM-883
SECTION 4
SELF DIAGNOSIS FUNCTION
If no acknowledgement is returned from a device which is turned "ON", the device has a problem.
In this case, one of the LED's responding to the problem device will flicker a defined number of times.
Flickering is operated by lighting the LED's for 60ss each time.
The flickering frequency responding to each failed device is shown below.
All the devices are checked one after another from the left of the table.
If an error is found, the responding LED will start flickering.
So, if more than 1 device have failed, only the one on the left side will flicker.
Device
Flickering
Frequency
NONVOLA-
TILE
MEMORY
1
—
—
Y/C JUNGLE
3
—
—
—
—
TONE
CONTROL
(IC 201)
6
– 20 –
KV-J25MN1AK
RM-883
Entering service mode
With the unit on standby
↓
DISPLAY
↓
5
↓
VOL (+)
↓
POWER
The operation sequence puts the unit into service mode.
SECTION 5
CIRCUIT ADJUSTMENTS
5-1. ADJUSTMENTS WITH COMMANDER
Service adjustments are made with the RM-883 that comes with
this unit.
[1], [4]
Raise/lower the service item number
[3], [6]
Raise/lower the data
[MUTING]
Writes
[0]
Executes the writing
[7], [0]
All data becomes the values in memory
[8], [0]
All user control goes to the standard state
[5], [0]
Service data initialization (Be sure not to use
usually.)
[2], [0]
Write 50Hz adjustment data to 60Hz, or
viceversa.
The screen display is :
[1], [4]
Select the adjustment item.
↓
[3], [6]
Raise/lower the data.
↓
[MUTING]
Writes
↓
[0]
Executes the writing.
SERVICE
Mode
08
DATA
RGB
50
Depends on the signals
PAL, SECAM : 50
NTSC : 60
1000
0000
Adjustment item
00
Item number
SELECT
p
PIC MODE
p
SOUND
MODE
VOL
PROGR
RM-883
g
POWER
DISP
REVEAL
MUTING
TV
JUMP
VIDEO
HOLD
TEXT
A/B
ENLARGE
WIDE/
V-ZOOM
WAKE UP
INDEX
SLEEP
TEXT CLR
+
+
1
2
3
4
6
7
8
9
0
+
p
–
p
5
TV
RM-883
Click on the first or last page to see other KV-J25MN1AK service manuals if exist.