Sony KV-21FA210 Service Manual ▷ View online
— 14 —
KV-21FA210
2-4. SCREEN (G2)
1. Input a dot pattern.
2. Set the PICTURE and BRIGHTNESS controls at minimum and
COLOR control at normal.
3. Adjust SBRT, GCUT, BCUT in service mode with an oscilloscope as
shown below so that voltages on the red, green, and blue cathodes
are 160 ± 2VDC.
are 160 ± 2VDC.
Pedestal
160 – 2VDC
Ground
±
4. Observe the screen and adjust SCREEN (G2) VR in FBT to obtain
the faintly visible background of dot signal.
2-5. METHOD OF SETTING THE SERVICE
ADJUSTMENT MODE
SERVICE MODE PROCEDURE
1. Standby mode (power off).
2. Press Display
Channel 5
Sound Volume +
Power
on the Remote Commander (press each button within a second).
SERVICE ADJUSTMENT MODE ON
1. The CRT displays the time being adjusted.
Mode
Category
Display
Item
Display
Item
Signal
Type
Type
ntsc
service
defl
vchp
00000000
00000000
hsiz
16
2. Press 1 or 4 on the Remote Commander to select the time.
3. Press 3 or 6 on the Remote Commander to change the data.
4. Press MUTING then ENTER to save into the memory.
SERVICE ADJUSTMENT MODE MEMORY
Turn the set off then on to exit Service Adjustment Mode.
service defl hsiz
16
ntsc
vchp 00000000 00000000
Category
Display
Item
Mode
Item
Data
Data
Signal
Type
Type
write
ENTER
Green
Red
MUTING
2-6. WHITE BALANCE ADJUSTMENTS
1. Input an entire white signal with burst.
2. Set to Service Adjustment Mode.
3. Set the PICTURE and BRIGHTNESS to minimum.
4. Adjust with SBRT if necessary.
5. Select GCUT and BCUT with 1 and 4 .
6. Adjust with 3 and 6 for the best white balance.
7. Set the PICTURE and BRIGHTNESS to maximum.
8. Select GDRV and BDRV with 1 and 4 .
9. Adjust with 3 and 6 for the best white balance.
10. To write into memory, press MUTING then ENTER .
— 15 —
KV-21FA210
HOLD-DOWN READJUSTMENT
If the setting indicated in Step 2 of Hold-Down Operation Confi rmation
cannot be met, readjustment should be performed by altering the
resistance value of R565 component marked with X.
cannot be met, readjustment should be performed by altering the
resistance value of R565 component marked with X.
+
IABL
ABL
T585
FBT
range
-
amPmeter
3.0 mA DC
A
3-2. B+ VOLTAGE CONFIRMATION AND
ADJUSTMENT
Note: The following adjustments should always be performed when
replacing the following components, which are marked with Y on the
schematic diagram on the A Board:
replacing the following components, which are marked with Y on the
schematic diagram on the A Board:
A BOARD: Y IC604, PH602
1. Using a Variac, apply AC input voltage: 130 + 2.0 / - 0.0 VAC.
2. Input a DOT pattern at Q.C.
3. Set the PICTURE and the BRIGHTNESS controls to minimum.
4. Confi rm the voltage of A Board between TP-23 & Ground is <136.6
VDC.
5. If step 4 is not satisfi ed, replace the components listed above, then
repeat Steps 1 – 3.
SECTION 3: SAFETY RELATED ADJUSTMENTS
3-1. X R565 CONFIRMATION METHOD
(HV HOLD-DOWN CONFIRMATION) AND
READJUSTMENTS
READJUSTMENTS
The following adjustments should always be performed when replacing
the following components which are marked with Y on the schematic
diagram:
the following components which are marked with Y on the schematic
diagram:
Part Replaced ( )
Adjustment ( )
DY, T585, CRT, IC001, IC561,
IC604, C507, C508, C506, T511,
L510, C588, L588, C566, C561,
C563, D567, D568, D566,
PH602, R567, R568, R565,
R566, R562, R563, R561, R528,
R668....................A Board
IC604, C507, C508, C506, T511,
L510, C588, L588, C566, C561,
C563, D567, D568, D566,
PH602, R567, R568, R565,
R566, R562, R563, R561, R528,
R668....................A Board
HV HOLD-DOWN
R565
R565
PREPARATION BEFORE CONFIRMATION
1. Using a Variac, apply AC input voltage: 120 ±2 VAC.
2. Turn the POWER switch ON.
3. Input a white signal and set the PICTURE and BRIGHTNESS
controls to maximum.
4. Confi rm that the voltage between C566 (+) or TP30 and ground is
more than 105 VDC.
HOLD-DOWN OPERATION CONFIRMATION
1. Connect the current meter between Pin 11 of the FBT (T585) and the
PWB land where Pin 11 would normally attach (See Figure 1 on the
next page).
next page).
2. Input a dot signal and set PICTURE and BRIGHTNESS to minimum:
IABL = 100 ± 100µA.
3. Confi rm the voltage of A Board TP-23 is 138.0 ± 0.3VDC.
4. Connect the digital voltmeter and the DC power supply via Diode
1SS119 to C566 (+) and ground (See Figure 1 on next page).
5. Increase the DC power voltage gradually until the picture blanks out.
6. Turn DC power source off immediately.
7. Read the digital voltmeter indication (standard < 117VDC).
8. Input a white signal and set PICTURE and BRIGHTNESS to
maximum: IABL = 1650 ± 100µA.
9. Repeat steps 4 to 7.
Y
— 16 —
KV-21FA210
Q590
T505
602
R505
C624
C505
C506
D598
C582
L588
Q522
IC565
IC545
IC561
L513
L511
HS522
C525
L525
D526
C513
D006
L516
C514
D545
D566
L582
C526
C511
C512
C618
CN515
R574
R528
R529
R537
R557
R549
R533
R534
C548
C529
Q402
C530
C540
R526
R593
R506
R570
R569
R568
R547
R502
R589
R411
R408
R594
R583
R546
C561
C212
C451
C571
D568
D630
D569
D528
D567
R540
R541
R566
D562
R532
R511
C640
C610
604
602
C595
C545
C547
R504
C544
C562
C528
C527
0
R581
C504
C502
D601
L515
R510
R588
R515
D624
Q505
Q506
R512
R514
R901
R548
R902
C625
T511
PS401
L371
L370
JR12
JR505
C651
R503
R591
C590
R609
C597
T585
R437
R598
Q521
R575
C510
D506
E
B
6
4
1
3
HDY-
HDY-
HDY+
HDY+
VDY-
VDY+
H-OUT
N/C
200V
GND
HEATER
-13V
GND
+13V
N/C
ABL
GND
GND
HDT
V.OUT
H-OUT
H-OUT
1
2
6
7
H.PROT
1
6
135V
TP21
TP28
TP29
TP27
TP19
TP20
TP17
TP16
TP33
TP30
TP24
TP25
E
B
TP23
TP31
TP22
C
E
B
FBT
E
B
( )
Figure 1
TP23
X R565
C566
+
-
DIGITAL
MULTIMETER
MULTIMETER
+
-
POWER
SUPPLY
SUPPLY
1SS119
AMMETER
3mA dc range
3mA dc range
+
-
A
— 17 —
KV-21FA210
4-1. SETTING THE SERVICE ADJUSTMENT
MODE
1. Standby mode (Power off).
2. Press the following buttons on the remote commander within a
2. Press the following buttons on the remote commander within a
second of each other:
Display
Channel 5
Sound Volumne +
Power
SERVICE ADJUSTMENT MODE ON
1. The CRT displays the item being adjusted.
service defl hsiz
16
ntsc
vchp 00000000 00000000
Category
Display
Item
Mode
Item
Data
Data
Signal
Type
Type
2. Press 1 or 4 on the Remote Commander to select the item.
3. Press 3 or 6 on the Remote Commander to change the data.
4. Press MUTING then ENTER to write into memory.
3. Press 3 or 6 on the Remote Commander to change the data.
4. Press MUTING then ENTER to write into memory.
SERVICE ADJUSTMENT MODE MEMORY
service defl hsiz
16
ntsc
vchp 00000000 00000000
Category
Display
Item
Mode
Item
Data
Data
Signal
Type
Type
write
1. Press 8 then ENTER on the Remote Commander to initialize.
service defl hsiz
16
ntsc
vchp 00000000 00000000
Category
Display
Item
Mode
Item
Data
Data
Signal
Type
Type
write
Carry out Step 1 when adjusting
IDs 0-7 and when replacing and
adjusting IC002
IDs 0-7 and when replacing and
adjusting IC002
3. Press MUTING then ENTER to write into memory.
2. Turn set off then on to exit Service Adjustment Mode.
2. Turn set off then on to exit Service Adjustment Mode.
SECTION 4: CIRCUIT ADJUSTMENTS
ELECTRICAL ADJUSTMENTS BY REMOTE COMMANDER
Use the Remote Commander
(RM-Y180)
to
perform the circuit adjustments in this section.
Test Equipment Required: 1. Pattern generator 2. Frequency counter 3. Digital multimeter 4. Audio oscillator
4-2. MEMORY WRITE CONFIRMATION
METHOD
1. After adjustment, pull out the plug from the AC outlet, then replace
the plug in the AC outlet again.
2. Turn the power switch ON and set to Service Mode.
3. Call the adjusted items again to confirm they were adjusted.
3. Call the adjusted items again to confirm they were adjusted.
4-3. REMOTE ADJUSTMENT BUTTONS AND
INDICATORS
VOLUME (+)
(Service Mode)
6
Item
(Data down)
ENTER
(Enter into
memory)
0
(Remove from
memory)
3
Item
(Data up)
RM-Y180
5
(Device item
down)
MUTING
(Enter into
memory)
1
Disp. (Item up)
2
(Device Item Up)
4
Disp. (Item down)
8
(Initialize)
DISPLAY
(Service Mode)
POWER
(Service Mode)
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