Sony KV-G14K3 User manual

MODEL COMMANDER DEST. CHASSIS NO.
KV-G14K3 RM-870 Vietnam SCC-K26L-A
KV-G21K3 RM-870 Vietnam SCC-K26M-A
SERVICE MANUAL
MODEL COMMANDER DEST. CHASSIS NO.
TRINITRON ® COLOR TV
RM-870 KV-G14K3 KV-G21K3
CHASSIS
BG-1S (D)

– 2 –
KV-G14K3/G21K3
RM-870
SPECIFICATIONS
CAUTION
SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE AND
THE ANODE CAPTOTHE METAL CHASSIS, CRT SHIELD, OR
CARBON PAINTED ON THE CRT, AFTER REMOVING THE
ANODE.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK !ON
THE SCHEMATIC DIAGRAMS, EXPLODEDVIEWS AND INTHE
PARTS LIST ARE CRITICALTO SAFE OPERATION. REPLACE
THESE COMPONENTS WITH SONY PARTS WHOSE PART
NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY.
Note
Power requirements 110-240 V AC, 50/60 Hz
Power consumption (W) Indicated on the rear of the TV
Television system B/G, D/K
Color system PAL, PAL 60, NTSC4.43, NTSC3.58 (AV IN)
Channel coverage
B/G VHF: E2 to E12/UHF: E21 to E69/CATV: S01 to S03, S1 to S41
D/K VHF: C1 to C2, R1 to R/12/UHF: C13 to C57, R21 to R/60/
CATV: S01 to S03, S1 to S41, Z1 to Z39
Audio output (speaker) 3W
Inputs Antenna: 75 ohms
VIDEO IN jacks: phono jacks
Video: 1 Vp-p, 75 ohms
Audio: 500 mVrms, high impedance
Outputs Earphone jack: mini jack
MONITOR OUT jacks: phono jacks
Video: 1 Vp-p, 75 ohms
Audio: 500 mVrms
Picture tube 14 in. 21 in.
Tube size (cm) 37 54 Measured diagonally
Screen size (cm) 34 51 Measured diagonally
Dimensions (w/h/d, mm) 369 ×347 ×403 527 ×464 ×471
Mass (kg) 11 22
KV-G14K3 KV-G21K3
Design and specifications are subject to change without notice.

– 3 –
KV-G14K3/G21K3
RM-870
TABLE OF CONTENTS
1. GENERAL.................................................................... 4
2. DISASSEMBLY
2-1. Rear Cover Removal ........................................... 10
2-2. A Board Removal ................................................ 10
2-3. Service Position ................................................... 10
2-4. Replacement of Parts ........................................... 10
2-5. Demagnetization Coil Removal .......................... 11
2-6. Picture Tube Removal ......................................... 12
3. SET-UP ADJUSTMENTS
3-1. Beam Landing ...................................................... 13
3-2. Convergence ........................................................ 14
3-3. Focus Adjustment ................................................ 16
3-4. G2 (Screen) and White Balance Adjustments..... 17
4. SELF DIAGNOSIS FUNCTION ...................... 18
5. CIRCUIT ADJUSTMENTS
5-1. Adjustments with Commander ............................ 19
5-2. Adjustment Method ............................................. 20
5-3. A Board Adjustment after IC003 (Memory)
Replacement......................................................... 23
5-4. Picture Distortion Adjustment ............................. 23
6. DIAGRAMS
6-1. Block Diagrams .................................................... 25
6-2. Circuit Boards Location ....................................... 27
6-3. Schematic Diagrams and Printed Wiring Boards
(1) Schematic Diagram of A Board............................ 31
(2) Schematic Diagrams of A11 and C Boards.......... 35
6-4. Semiconductors..................................................... 39
7. EXPLODED VIEWS
7-1. Chassis (KV-G14K3) ............................................ 41
7-2. Chassis (KV-G21K3) ............................................ 42
8. ELECTRICAL PARTS LIST............................. 43
Section Title Page Section Title Page

– 4 –
KV-G14K3/G21K3
RM-870
SECTION 1
GENERAL
The operating instructions mentioned here are partial abstracts from the
Operating Instructions Manual. The page numbers of the Operating
Instruction Manual remain as in the manual.
2
3
B/G I D/K M
TV SYSTEM AUTO PROGR
TV SYSTEM
AUTO PROGR

– 5 –
KV-G14K3/G21K3
RM-870
Getting Started
4
Connections
Connecting a VHF antenna or a combination VHF/UHF antenna
— 75-ohm coaxial cable (round)
Attach an optional IEC antenna connector to the 75-ohm coaxial cable.
Plug the connector into the (antenna) socket at the rear of the TV.
Getting Started
or
On a wall
Rear of TV Rear of TV
Connecting optional equipment
You can connect optional audio/video equipment to your TV such as a VCR, multi disc player, camcorder, video
game or stereo system.
Connecting video equipment using video input jacks
VIDEO IN
Rear of TV
VIDEO
IN
MONITOR
OUT
VIDEO
AUDIO
to video
and audio
outputs
: Signal flow
to antenna
output VCR
to antenna socket
Getting Started
5
Connecting audio/video equipment using MONITOR OUT jacks
to antenna
output
or
MONITOR OUT
Rear of TV
When recording through the MONITOR OUT jacks
If you change the channel or video input while recording with a VCR, the channel or video input you are recording also will be changed.
to antenna socket
Audio system
VIDEO
VIDEO INPUT
AUDIO
: Signal flow
to video and
audio outputs
Camcorder
VIDEO
IN
MONITOR
OUT
VIDEO
AUDIO
: Signal flow
to video
and audio
inputs
VCR
Front of TV
When using the video input jacks
Do not connect video equipment to the video input jacks at the front and the rear of your TV simultaneously; otherwise the picture will
not be displayed properly on the screen.

– 6 –
KV-G14K3/G21K3
RM-870
Getting Started
6
Presetting channels
Presetting channels manually using the
buttons on the TV
1 Press MANUAL PROGR.
2 Press PROGR +/– on the remote commander
until the required program position
appears on the screen.
3 Press VOLUME +/– until the required channel
picture appears on the screen.
4 Press MANUAL PROGR.
Disabling program positions using the
buttons on the TV
By disabling unused or unwanted program positions,
you can skip those positions when you press
PROGR +/– on the remote commander.
1 Press PROGR +/– on the remote commander
until the unused or unwanted program
position appears on the screen.
2 Press MANUAL PROGR.
3
Press PIC MODE on the remote commander.
4
Press MANUAL PROGR.
To cancel the skip setting
Preset the channel manually or automatically again.
You can preset up to 100 TV channels in numerical
sequence from program position 1 automatically.
To change the channel for a particular program
position or to receive a channel with a weak signal,
you can preset the channel manually. You can also
disable program position.
You can preset TV channels using the buttons on the
TV or the remote commander.
Presetting channels automatically
using the buttons on the TV
Front of TV
1 Press POWER to turn on the TV.
When the TV is turned on in standby mode, press
POWER on the remote commander.
2 Press AUTO PROGR.
To start presetting channels automatically
from the specified program position
1Press MANUAL PROGR.
2Press PROGR +/– to select the program position.
3Press AUTO PROGR.
POWER
MANUAL PROGR
COLOR SYSTEM
R
SELECT
TV SYSTEM
AUTO PROGR
POWER
1
2
AUTO PROGR
123 1
Getting Started
7
Presetting channels automatically
using the remote commander
1 Press POWER to turn on the TV.
When the TV is turned on in standby mode, press
POWER on the remote commander.
2 Press SELECT until “AUTO PROGRAM”
appears.
3 Press + or – .
4 Press + or – .
Presetting channels manually using the
remote commander
1 Press PROGR +/– or a number button until
the required program appears on the
screen.
+ or –
SELECT
POWER
SELECT
AUTO PROGRAM
VHF LOW B/G
12 3 1
If you are not satisfied with the picture
and sound quality
You may be able to further improve the picture and
sound quality by using fine tuning as below:
1 Select the program position you want to
adjust.
2
Press SELECT until “MANUAL PROGRAM”
appears on the screen.
3 Press + or – on the remote commander
once.
4
Press DISP until “FINE” appears on the
screen.
5 Press + or – continuously until you are
satisfied with the picture and sound
quality.
6 Press SELECT to return to normal screen.
or
123
46
789
÷0
5
PROGR
JUMP
2 Press SELECT until “MANUAL PROGRAM”
appears.
3 Press + or – .
4 Press + or – .
The selected channel appears on the screen.
5 Press SELECT to return to normal screen.
VHF LOW B/G
SELECT
MANUAL PROGRAM
1
SELECT

– 7 –
KV-G14K3/G21K3
RM-870
9
Operations
DISP
REVEAL
Setting the Sleep Timer
You can set the TV to automatically turn off as you
have programmed.
Press SLEEP/TEXT CLR.
To cancel the Sleep Timer, press SLEEP/TEXT CLR
repeatedly until “SLEEP TIMER: OFF” appears, or turn
off the TV.
Changing the on-screen display
language
You can use buttons on the remote commander or the
TV to change the on-screen display language.
1
Press SELECT until the screen appears as
follows:
2
Press + or – to select “ ”.
Note
•You can also use SELECT and VOLUME +/– on the TV to
select the on-screen display language.
Setting the Wake Up Timer
You can set the TV to automatically turn on as you have
programmed.
1 Press WAKE UP/INDEX repeatedly to set the
timer.
The on-screen display appears and the WAKE UP
indicator on the TV lights up.
2 If you want a particular TV program or
video input to be displayed using the Wake
Up Timer, select the TV program or video
input.
3 Press POWER on the remote commander or
set the Sleep Timer to turn off the TV in
standby mode.
To cancel the Wake Up Timer, press WAKE UP/INDEX
repeatedly until “WAKE UP TIMER: OFF” appears, or
turn off the main power of the TV.
Notes
•The Wake Up Timer starts immediately after the on-screen
display disappears.
•The last TV program position or video input just before the TV
turns into standby mode will appear when the TV is turned on
using the Wake Up Timer.
•If no buttons or controls are pressed for more than two hours
after the TV is turned on using the Wake Up Timer, the TV
automatically turns into standby mode. If you want to
continue watching the TV, press any button or control on the
remote commander or the TV.
1
AUTO B/G
DYNAMIC
Displaying on-screen information
Press DISP/REVEAL.
The program position, local system, and TV settings are
displayed on the screen.
After 10 minutes
WAKE UP TIMER:10M
WAKE UP TIMER:OFF WAKE UP TIMER:12H00M
No wake up timer After 12 hours
SLEEP TIMER:30M SLEEP TIMER:60M
SLEEP TIMER:OFF SLEEP TIMER:90M
No sleep timer After 90 minutes
After 60 minutes
After 30 minutes
WAKE UP
INDEX
SLEEP
TEXT CLR
+ or –
SELECT
SELECT
LANGUAGE / : ENGLISH
: LANGUAGE /
Operations
8
VIDEO
HOLD
POWER
123
46
789
÷0
5
JUMP
Watching the TV
1 Press POWER to turn on the TV.
When the TV is turned on in standby mode, press
POWER on the remote commander.
2 Select the TV program you want to watch.
To select a program position directly
Press the number button.
To select a two-digit program position, press “-/--”
before pressing the number buttons.
For example: to select program position 25, press
“-/--,” and then “2” and “5.”
To scan through program positions
Press PROGR +/– until the program position you
want appears.
3 Press VOL +/– to adjust the volume.
Turning off the TV
To turn off the TV temporarily
Press POWER on the remote commander. The
STANDBY indicator on the TV lights up.
To turn off the TV completely
Press POWER on the TV.
If the power on the TV is turned off in standby mode,
the STANDBY indicator on the TV may remain alight for
a while.
Watching the video input
Press VIDEO/HOLD.
To watch TV
Press TV.
Switching back quickly to the previous
channel
Press JUMP.
Muting the sound
Press MUTING.
÷2 5
PROGR
Operations
VIDEO 1
POWER
POWER
JUMP
VOL
TV
MUTING
MUTING

– 8 –
KV-G14K3/G21K3
RM-870
Operations
10
Using the Child Lock
feature
Watching the picture
in wide mode
You can prevent a child from watching certain program
positions by using the buttons on the remote
commander.
1 Select the TV program you want to lock.
2 Press SELECT until “CHILD LOCK” appears
on the screen.
3
Press + or – until “LOCKED” appears on the
screen.
Notes
•To unlock the program position, repeat steps 1 to 3 as above
until “LOCKED” disappears from the screen.
•To prevent your child from unlocking the program position,
keep the remote commander away from your child.
÷0
+ or –
SELECT
SELECT
CHILD LOCK
LOCKED
You can adjust the display mode accordingly to fit the
programs to your TV screen size.
Press WIDE/V-ZOOM repeatedly until the wide
display mode you want appears on the screen.
TV
WIDE/
V-ZOOM
Good-bye,Jane
Good-bye.
Good-bye,Jane
Good-bye.
WIDE
V-ZOOM
NORMAL
Normal display
mode “WIDE” mode
“V-ZOOM” mode
11
Operations
Adjusting the
picture
Adjusting the picture
Note on the SOUND MODE button
•The sound mode feature is unavailable for your TV. Thus, the
SOUND MODE button on the remote commander is not used
for your TV.
Selecting the picture mode
Press PIC MODE until the mode you want
appears.
Each time you press PIC MODE, the screen changes as
follows:
Note
•If you change the picture mode after the following
adjustments, the adjustment changes in accordance with the
picture mode.
÷0
SOUND
MODE
SELECT
PIC MODE
+ or –
High contrast
picture
DYNAMIC STANDARD SOFT
Normal
picture
Soft picture
PIC MODE
Adjusting the picture setting
1 Press SELECT until the item you want to
adjust appears.
Each time you press SELECT, the screen changes
as follows:
2
Press + or – to adjust the item.
3 To adjust other items, repeat steps 1 and 2.
Note
•You can also use SELECT and VOLUME +/– on the TV to
adjust the picture setting.
If the picture color is abnormal when receiving
programs through the ˘(antenna) terminal
Change the
“COLOR SYSTEM” setting or adjust the “COLOR” level
in the on-screen display until the color becomes normal.
If the picture color is abnormal when receiving
programs through the video input jack
Change the “COLOR SYSTEM” setting or adjust the “COLOR”
level in the on-screen display until the color becomes normal.
Note
•Normally set “COLOR SYSTEM” to “AUTO”.
SELECT
PICTURE COLOR
BRIGHT
HUE
SHARPNESS
(Operative for
NTSC signal only)
MANUAL PROGR
COLOR SYSTEM
R
SELECT
TV SYSTEM
AUTO PROGR
Front of TV

– 9 –
KV-G14K3/G21K3
RM-870
Additional Information
12
Troubleshooting
Additional Information
If you have any problems, read this manual again and
check the countermeasure for each of the symptoms
listed below.
If the problem persists, contact your nearest authorized
service center or dealer.
Snowy picture
Noisy sound
/Check the antenna.
/Check the antenna connection on the TV
and on the wall.
Dotted lines or stripes
/This may be caused by local interference
(e.g. cars, neon signs and hair dryers). Adjust
the antenna for minimum interference.
Double images or “ghosts”
/This may be caused by reflections from
nearby mountains or buildings. A highly
directional antenna may improve the picture.
No color
/Adjust the COLOR level in the on-screen
display.
/Check the COLOR SYSTEM setting.
No picture
No sound
/Press POWER.
/Check the antenna connection.
/Check the VCR connections.
/Check the power cord connection.
/Check the standby mode.
Good picture
No sound
/Press VOLUME +.
/Press MUTING.
TV cabinet creaks
/Even if the picture or the sound is normal,
changes in the room temperature
sometimes make the TV cabinet expand or
contract, making a noise. This does not
indicate a malfunction.
Note on the remote commander
•The supplied remote commander is used on several models of
the TV. If you do not find instructions for some controls that
are on the remote commander, that means your TV does not
employ the features of those controls, e.g. TEXT.
Note on the TV SYSTEM button
•The TV SYSTEM button is not used on your TV.
Notes
•When you switch on the TV, you may hear the “boon” sound
that is caused by the demagnetization of the TV. This does not
indicate a malfunction.
•The picture color may become abnormal if you change the
direction of your TV. To obtain the normal picture color, press
POWER on the TV to switch off the TV for five minutes and
then switch it on again.
WARNING
Do not install the appliance in a confined space, such as
a bookcase or built-in cabinet.

– 10 –
KV-G14K3/G21K3
RM-870
2-1. REAR COVER REMOVAL
2-2. A BOARD REMOVAL
2-3. SERVICE POSITION
SECTION 2
DISASSEMBLY
2Two screws
(BVTP 4×16)
3One screw
(BVTP 3×12: KV-G14K3)
(BVTP 3×16: KV-G21K3)
1Two screws
(BVTP 4×16)
2-4. REPLACEMENT OF PARTS
For replacement of the Control Button, (Multi Button) Light Guide and Power Button, cut the
welded portions from them, exchange with the new parts, and fix them with screws (+BVTP)
respectively.
2-4-1. REPLACEMENT OF CONTROL BUTTON/MULTI BUTTON
(1) For KV-G14K3
A board
Cut
Control button
Lever
Lever A board
Control button
Two screws
(BVTP 3×12)

– 11 –
KV-G14K3/G21K3
RM-870
(2) For KV-G21K3 2-5. DEMAGNETIZATION COIL REMOVAL
(1) For KV-G14K3
(2) For KV-G21K3
2Demagnetization coil 1Tension spring
Picture tube
3
3DGC holder DGC holder
1Demagnetization coil
2Tension spring
Picture tube
2-4-2. REPLACEMENT OF LIGHT GUIDE, POWER BUTTON
(1) For KV-G14K3
Power button
Two screws
(BVTP 3×12)
Light guide
Power button
Cut
Cut
(2) For KV-G21K3
Cut
Light guide
Power button
Two screws
(BVTP 3×10)
Two screws
(BVTP 3×10)

– 12 –
KV-G14K3/G21K3
RM-870
2-6. PICTURE TUBE REMOVAL
(1) For KV-G14K3
2 A board
3 C board
4 Deflection yoke
Cushion
5 Four screws
(Tapping screws)
1 Anode cap
(2) For KV-G21K3
2 A board
3 C board
4 Deflection yoke
Cushion
5 Four screws
(Tapping screws)
1 Anode cap
a
a
b
b
2Using a thumb pull up the rubber
cap firmly in the direction indicated
by the arrow b.
1Turn up one side of the rubber cap
in the direction indicated by the
arrow a.
c
Anode button
3When one side of the rubber cap is
separated from the anode button,
the anode-cap can be removed by
turning up the rubber cap and
pulling it up in the direction of the
arrow c.
•HOWTO HANDLE ANANODE-CAP
1Do not damage the surface of anode-caps with sharp shaped objects.
2Do not press the rubber too hard so as not to damage the inside of anode-caps.
A metal fitting called the shatter-hook terminal is built into the rubber.
3Do not turn the foot of rubber over too hard.
The shatter-hook terminal will stick out or damage the rubber.

– 13 –
KV-G14K3/G21K3
RM-870
•The following adjustments should be made when a complete
realignment is required or a new picture tube is installed.
•These adjustments should be performed with rated power
supply voltage unless otherwise noted.
Controls and switch should be set as follows unless otherwise noted:
PICTURE control........................................................... normal
BRIGHTNESS control................................................... normal
SECTION 3
SET-UP ADJUSTMENTS
Fig. 3-1
.................................................................................................................................................................................................................................
Preparations :
•In order to reduce the influence of geomagnetism on the set's
picture tube, face it east or west.
•Switch on the set's power and degauss with the degausser.
3-1. BEAM LANDING
1. Input a white signal with the pattern generator.
Contrast
Brightness
2. Set the pattern generator raster signal to a green raster.
3. Move the deflection yoke to the rear and adjust with the purity
control so that the green is at the center and the blue and the red
take up equally sized areas on each side.
(See Figures 3-1 through 3-3.)
4. Move the deflection yoke forward and adjust so that the entire
screen is green. (See Figure 3-1.)
5. Switch the raster signal to blue, then to red and verify the
condition.
6. When the position of the deflection yoke has been decided,
fasten the deflection yoke with the screws.
7. If the beam does not land correctly in all the corners, use a
magnet to adjust it.
(See Figure 3-4.)
Perform the adjustments in order as follows :
1. Beam Landing
2. Convergence
3. Focus
4. White Balance
Note : Test Equipment Required.
1. Color-bar/Pattern Generator
2. Degausser
3. Oscilloscope
Fig. 3-3
Fig. 3-4
}normal
Fig. 3-2
GREEN
BLUE RED
Deflection yoke positioning
corrects these areas.
Purity control corrects
this area. Disk magnets or rotatable
disk magnets correct
these areas (a-d).
a
c
b
d
Purity control

– 14 –
KV-G14K3/G21K3
RM-870
3-2. CONVERGENCE
Preparations :
•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
R G B
G
R
B
Center dot
V.STAT MagnetBMC Magnet
1. (Moving horizontally), adjust the H.STAT magnet so that the
red, green and blue points are on top of each other at the center
of the screen.
2. (Moving vertically), adjust the V.STAT magnet so that the red,
green and blue points are on top of each other at the center of
the screen.
3. If the V.STAT Magnet cannot bring the red, green and blue points
together at the center of the screen, adjust the horizontal
convergence with the BMC Magnet and theV. STAT magnet in
the manner given below.
(In this case, the BMC Magnet and the V. STAT magnet
influence each other.)
4. If the V.STAT magnet is moved in the direction of theaand b
arrows, the red, green and blue points move as shown below.
•Operation of V.STAT Magnet.
B
R
B
R
ab
bb
a
b
a
b
a
R
G
B
b
B
G
R
b
ba
a
1
2
3
GG
B G R
R G B
•Operation of BMC (Hexapole) Magnet.
ba
ba
ba
a
b
a
b
R G BR G B
ba
R G
B
R G B
ba
R G BR G B
ba
G B
R
R G B

– 15 –
KV-G14K3/G21K3
RM-870
Purity
V.STAT
BMC (Hexapole)
•The respective dot positions resulting from moving each magnet
interact, so be sure to perform adjustment while tracking.
Use the V. STAT magnet to adjust the red, green, and blue dots
so they coincide at the center of screen (by moving the dots in
the horizontal direction).
(2) Dynamic Convergence Adjustment
Preparations :
•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.
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.
R
G
B
RGB
RGBR
G
B
RGBRGB
RGB RGB
R
G
BRGBR
G
B
RGB

– 16 –
KV-G14K3/G21K3
RM-870
(3) Screen-corner Convergence 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), select an item of adjustments.
3) Press [MUTING] button indicate WRITE (Green) on screen.
4) Press [0] button to write into memory.
d. MEMORY WRITE CONFIRMATION METHOD
1) After adjustment, pull out the plug from AC outlet, then, plug
in 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.
Item
number Note
Adjustment
item Initial DATA
09 RDR 25 WHITE POINT R
0A GDR 20 WHITE POINT G
0B BDR 20 WHITE POINT B
3-3. FOCUS ADJUSTMENT
Adjust FOCUS using RV703 on the C Board (KV-G14K3 only) or
FOCUS control on the flyback transformer (KV-G21K3 only) for
the best focus.
FLYBACK TRANSFORMER(T851)
(KV-G21K3 only)
Note: Screen VR is not used.
a-d : screen-corner
misconvergence
ba
cd
FOCUS
SCREEN
(NOT USED)
SERVICE
MUTING
1 F
DATA
RDR
Adjustment Item
09
Item number
WRITE1 FRDR09
0
Executes the writing
Green
Fix a Permalloy assy
corresponding to the
misconverged areas
Permalloy assembly
a
b
c
d

– 17 –
KV-G14K3/G21K3
RM-870
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 oscillo-
scope.
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] .
0 V
165±2 V: KV-G14K3
177±2 V: KV-G21K3

– 18 –
KV-G14K3/G21K3
RM-870 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
—
—
—
—
AUDIO
PROCESSOR
(TA8776N)
6

– 19 –
KV-G14K3/G21K3
RM-870
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-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 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.
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 Mode08
DATA
RGB
50 Depends on the signals
PAL, SECAM : 50
NTSC : 60
10000000
Adjustment item
00
Item number
RM-870

– 20 –
KV-G14K3/G21K3
RM-870
5-2. 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 change back to SERVICE.)
Use the same method for Items Number 00-2D. 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
GREEN0CVSF08
SERVICE
50
50
50
GREEN0CVSF08
Adjusted with [3] and [6] buttons
Written with [MUTING]
Write executed with [0]
GREEN
The WRITE display
will change back to
SERVICE.
0CVSF08