Sony KV-T25SN81 Service Manual ▷ View online
– 17 –
KV-T25SN81
RM-870
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
adjustments.
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 to confirm adjustments were made.
Item
number
number
Note
Adjustment
item
item
Initial DATA
09
RDR
25
WHITE POINT R
0A
GDR
20
WHITE POINT G
0B
BDR
20
WHITE POINT B
SERVICE
MUTING
1 F
DATA
RDR
Adjustment Item
09
Item number
WRITE
1 F
RDR
09
0
Executes the writing
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 25
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
- .
0 V
Focus
175 V DC
– 18 –
KV-T25SN81
RM-870
Entering service mode
With the unit on standby
↓
DISPLAY
↓
5
↓
VOL (+)
↓
POWER
The operation sequence puts the unit into service mode.
SECTION 4
CIRCUIT ADJUSTMENTS
4-1. ADJUSTMENTS WITH COMMANDER
Service adjustments are made with the RM-870 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 the 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 vice
versa.
The screen display is :
[1], [4]
Select the adjustment item.
↓
[3], [6]
Raise/lower the data.
↓
[MUTING]
Writes
↓
[0]
Executes the writing.
MUTING
TEXT
VIDEO
HOLD
TV
TEXT CLR
+
SELECT
PIC MODE
A/B
ENLARGE
WAKE UP
INDEX
VOL
PROGR
SLEEP
+
1
2
3
4
5
6
7
8
9
0
DISPLAY
REVEAL
POWER
+
÷
SERVICE
Mode
08
DATA
RGB
50
Depends on the signals
PAL, SECAM : 50
NTSC : 60
1000
0000
Adjustment item
00
Item number
RM-870
– 19 –
KV-T25SN81
RM-870
4-2. ADJUSTMENT METHOD
Item Number 08
This explanation uses V-SHIFT as an example.
1. Select 08 V-SHIFT 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 0F for PAL
reception.)
4. Write with the
[MUTING] button.
5. Execute the writing with the
[0] button. (The WRITE
display will be changed to green SERVICE.)
Use the same method for Items Number 00-4B. Use
[1] and [4] to
select the adjustment item, use
[3] and [6] to adjust, write with
[MUTING], then execute the write with [0].
WRITE
WRITE
GREEN
0C
VSF
08
SERVICE
50
50
50
GREEN
0C
VSF
08
Adjust with the
[3]
and
[6]
buttons.
Written with the
[MUTING]
.
Write executed with
[0]
.
GREEN
The WRITE display
will be changed back to
SERVICE.
The WRITE display
will be changed back to
SERVICE.
0C
VSF
08
– 20 –
KV-T25SN81
RM-870
Adjustment Item Table
Data
range
range
Initial
data
Standard data
Note
Device
Item
Adjustment
number
Item
00
HSF
00–3F
24
H SHIFT
TDA8375A
01
HSZ
00–3F
23
H SIZE
TDA8375A
02
PAP
00–3F
21
PIN AMPLITUDE
TDA8375A
03
CNP
00–3F
29
CORNER PIN
TDA8375A
04
TLT
00–3F
20
TILT
TDA8375A
05
VSL
00–3F
20
V SLOPE
TDA8375A
06
VAP
00–3F
1D
V AMPLITUDE
TDA8375A
07
SCR
00–3F
20
S CORRECTION
TDA8375A
08
VSF
00–3F
20
V SHIFT
TDA8375A
09
RDR
00–3F
25
WHITE POINT R
TDA8375A
0A
GDR
00–3F
20
WHITE POINT G
TDA8375A
0B
BDR
00–3F
20
WHITE POINT B
TDA8375A
0C
FO
00–02
00
TV/VIDEO/TEXT
PHI-1 TIME CONSTANT
TDA8375A
0D
AGC
00–3F
30
AGC TAKE OVER
TDA8375A
0E
VSW
00–01
00
VIDEO MUTE
TDA8375A
0F
FOR
00–03
00
FORCED FIELD FREQ.
TDA8375A
10
DL
00–01
00
INTERLACE
TDA8375A
11
POC
00–01
00
SYNCHRO MODE FIX
TDA8375A
12
VID
00–01
00
VIDEO IDENT MODE
TDA8375A
13
HCO
00–01
00
EHT TRACKING MODE
TDA8375A
14
EVG
00–01
00
ENABLE V GUARD
TDA8375A
15
SBL
00–01
00
SERVICE BLANKING
TDA8375A
16
PRD
00–01
00
OVER-VOLTAGE INPUT
TDA8375A
17
COR
00–01
00
NOISE CORING PEAK
TDA8375A
18
PMX
00–3F
27
PICTURE MAX DATA
TDA8375A
19
PMI
00-3F
05
PICTURE MIN DATA
TDA8375A
1A
SBR
00–7F
4B
SUB-BRIGHTNESS
TDA8375A
1B
SHU
00–0F
07
SUB-HUE
TDA8375A
1C
SSH
00–03
01
TV/VIDEO
SUB-SHARPNESS
TDA8375A
1D
SC1
00–3F
1F
SUB-COLOR LOWER
TDA8375A
1E
SC2
00–3F
0B
SUB-COLOR HIGHER
TDA8375A
1F
AIP
00–7F
3F
ADJUSTMENT IF PLL
TDA8375A
20
VZM
00–3F
19
VERTICAL ZOOM
TDA8375A
21
FAW
00–FF
08
NICAM FAW THRESH
MSP3410
22
CTM
00–FF
08
NICAM ERROR BIT (MONO)
MSP3410
23
CTN
00–FF
50
NICAM ERROR BIT (NICAM)
MSP3410
24
WCD
00–FF
0A
W. G. CHANGE DATA
MSP3410
25
WST
00–FF
15
W. G. STEREO CUT POINT
MSP3410
26
WTM
00–FF
50
W. G. TIMER CHANGE
MSP3410
27
WBT
00–FF
EA
W. G. BILINGUAL
MSP3410
28
ACG
00–01
01
AGC AUTO/CONSTANT
MSP3410
29
CDB
00–3F
28
AGC GAIN CONSTANT
MSP3410
2A
FGP
00–7F
24
FM (BG, I, DK) PRESCALE
MSP3410
2B
FMP
00–7F
40
FM (M) PRESCALE
MSP3410
2C
WGP
00–7F
3C
W. G. PRESCALE
MSP3410
2D
NIP
00–7F
7F
NICAM PLESCALE
MSP3410
2E
CRM
00–01
00
CARRIOR MUTE
MSP3410
2F
CML
00–03
00
AUDIO CLOCK OUT
MSP3410
31
WAC
00–01
01
W. G. AGREEMENT COUNT
MSP3410
32
DLY
00–FF
30
STEREO SEARCH DELAY
MSP3410
33
DLG
00–FF
10
INTERVAL OF ID CHECK
MSP3410
34
TXP
00–0F
09
TEXT PICTURE
SAA5281
35
MXP
00–0F
0D
TEXT MIX MODE PICTURE
SAA5281
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