JVC AV-27530/SC User manual

SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited No.YA050B
2005/11
COLOR TELEVISION
YA050B200511 AV-27530/SC
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
BASIC CHASSIS
FE5

1-2 (No.YA050B)
SPECIFICATION
Design & specifications are subject to change without notice.
Items Contents
Dimensions (W ×H ×D) 65.4 cm ×59.3 cm ×49.4 cm (25-3/4" ×23-3/8" ×19-1/2")
Mass 31.1 kg (68.5 Ibs)
TV RF System CCIR (M)
Color System NTSC
Sound System BTSC (Multi Channel Sound)
Teletext System Closed Caption (T1 - T4 / CC1 - CC4)
TV Receiving Channels
and Frequency VHF low VHF high
UHF
CATV
02ch - 06ch: 54 MHz - 88 MHz
07ch - 13ch: 174 MHz - 216 MHz
14ch - 69ch: 470 MHz - 806 MHz
54MHz - 804 MHz
Low Band: 02 - 06
High Band: 07 - 13
Mid Band: 14 - 22
Super Band: 23 - 36
Hyper Band: 37 - 64
Ultra Band: 65 - 94, 100 - 135
Sub Mid Band: 01, 96 - 99
TV / CATV Total Channel 181 Channels
[Reception of channel A-5 ("95" of the TV set’s on-screen CABLE channel) is
recommended for your TV set.]
Intermediate Frequency Video IF
Sound IF 45.75 MHz 41.25 MHz (4.5 MHz)
Color Sub Carrier 3.58 MHz
Power Input AC120 V, 60 Hz
Power Consumption 105 W
Picture Tube (Visible size) 68 cm (27") Measured diagonally (H: 55.4 cm ×V: 41.8 cm)
High Voltage 30.0 kV ±1.3 kV [at Zero beam current]
Speaker 5 cm ×9 cm (2" ×3-1/2"), Oval type ×2
Audio Power Output 1.2 W + 1.2 W
Antenna Terminal (VHF / UHF) F-type connector, 75 Ωunbalanced
Video / Audio input
[Input-1/2/3] Component Video [Input-2]
S-video
[Input-1]
Video
Audio
RCA pin jack ×3
Y : 1V(p-p), 75 Ω, negative sync
Pb/Pr : 0.7 V(p-p), 75 Ω
Mini DIN 4-pin connector ×1
Y : 1 V(p-p), 75 Ω, negative sync
C : 0.286 V(p-p)(burst signal), 75 Ω
1 V(p-p), 75 Ω, negative sync, RCA pin jack ×2
500 mV(rms)(-4dBs), high impedance, RCA pin jack ×6
Audio Output (Fix) 500 mV(rms)(-4dBs), low Impedance, (400 kHz when modulated 100 %), RCA pin jack ×2
Remote Control Unit RM-C203 (Lithium cell battery ×1)

(No.YA050B)1-3
SECTION 1
PRECAUTION
1.1 SAFETY PRECAUTIONS
(1) The design of this product contains special hardware, many
circuits and components specially for safety purposes. For
continued protection, no changes should be made to the original
design unless authorized in writing by the manufacturer.
Replacement parts must be identical to those used in the original
circuits. Service should be performed by qualified personnel only.
(2) Alterations of the design or circuitry of the products should not be
made. Any design alterations or additions will void the
manufacturer's warranty and will further relieve the manufacturer
of responsibility for personal injury or property damage resulting
therefrom.
(3) Many electrical and mechanical parts in the products have special
safety-related characteristics. These characteristics are often not
evident from visualinspectionnor can the protection affordedby them
necessarily be obtained by using replacement components rated for
higher voltage, wattage, etc. Replacement parts which have these
special safety characteristics are identified in the parts list of Service
manual. Electrical components having such features are
identified by shading on the schematics and by ( ) on the
parts list in Service manual. The use of a substitute replacement
which does not have the same safety characteristics as the
recommended replacement part shown in the parts list of Service
manual may cause shock, fire, or other hazards.
(4) Use isolation transformer when hot chassis.
The chassis and any sub-chassis contained in some products are
connected to one side of the AC power line. An isolation
transformer of adequate capacity should be inserted between the
product and the AC power supply point while performing any
service on some products when the HOT chassis is exposed.
(5) Don't short between the LIVE side ground and ISOLATED (NEU-
TRAL) side ground or EARTH side ground when repairing.
Some model's power circuit is partly different in the GND. The differ-
ence of the GND is shownby the LIVE: ( ) side GND, the ISOLAT-
ED (NEUTRAL) : ( ) side GND and EARTH : ( ) side GND.
Don't short between the LIVE side GND and ISOLATED (NEUTRAL)
side GND or EARTH side GND and never measure the LIVE side
GND and ISOLATED (NEUTRAL) side GND or EARTH side GND at
the same time with a measuring apparatus (oscilloscope etc.). If
above note will not be kept, a fuse or any parts will be broken.
(6) If any repair has been made to the chassis, it is recommended that
the B1 setting should be checked or adjusted (See B1 POWER
SUPPLY check).
(7) The high voltage applied to the picture tube must conform with that
specified in Service manual. Excessive high voltage can cause an
increase in X-Ray emission, arcing and possible component
damage, therefore operation under excessive high voltage
conditions should be kept to a minimum, or should be prevented.
If severe arcing occurs, remove the AC power immediately and
determine the cause by visual inspection (incorrect installation,
cracked or melted high voltage harness, poor soldering, etc.). To
maintain the proper minimum level of soft X-Ray emission,
components in the high voltage circuitry including the picture tube
must be the exact replacements or alternatives approved by the
manufacturer of the complete product.
(8) Do not check high voltage by drawing an arc. Use a high voltage
meter or a high voltage probe with a VTVM. Discharge the picture
tube before attempting meter connection, by connecting a clip lead
to the ground frame and connecting the other end of the lead
through a 10kΩ2W resistor to the anode button.
(9) When service is required, observe the original lead dress. Extra
precaution should be given to assure correct lead dress in the high
voltage circuit area. Where a short circuit has occurred, those
components that indicate evidence of overheating should be
replaced. Always use the manufacturer's replacement
components.
(10) Isolation Check (Safety for Electrical Shock Hazard)
After re-assembling the product, always perform an isolation
check on the exposed metal parts of the cabinet (antenna
terminals, video/audio input and output terminals, Control knobs,
metal cabinet, screw heads, earphone jack, control shafts, etc.) to
be sure the product is safe to operate without danger of electrical
shock.
a) Dielectric Strength Test
The isolation between the AC primary circuit and all metal parts
exposed to the user, particularly any exposed metal part having a
return path to the chassis should withstand a voltage of 1100V AC
(r.m.s.) for a period of one second.
(. . . . Withstand a voltage of 1100V AC (r.m.s.) to an appliance rat-
ed up to 120V, and 3000V AC (r.m.s.) to an appliance rated 200V
or more, for a period of one second.) This method of test requires
a test equipment not generally found in the service trade.
b) Leakage Current Check
Plug the AC line cord directly into the AC outlet (do not use a line
isolation transformer during this check.). Using a "Leakage
Current Tester", measure the leakage current from each exposed
metal part of the cabinet, particularly any exposed metal part
having a return path to the chassis, to a known good earth ground
(water pipe, etc.). Any leakage current must not exceed 0.5mA AC
(r.m.s.).
However, in tropical area, this must notexceed 0.2mA AC (r.m.s.).
Alternate Check Method
Plug the AC line cord directly into the AC outlet (do not use a
line isolation transformer during this check.). Use an AC
voltmeter having 1000Ωper volt or more sensitivity in the
following manner. Connect a 1500Ω10W resistor paralleled by
a 0.15µF AC-type capacitor between an exposed metal part
and a known good earth ground (water pipe, etc.). Measure the
AC voltage across the resistor with the AC voltmeter. Move the
resistor connection to each exposed metal part, particularly any
exposed metal part having a return path to the chassis, and
measure the AC voltage across the resistor. Now, reverse the
plug in the AC outlet and repeat each measurement. Any
voltage measured must not exceed 0.75V AC (r.m.s.). This
corresponds to 0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.3V AC
(r.m.s.). This corresponds to 0.2mA AC (r.m.s.).
(11) High voltage hold down circuit check.
After repair of the high voltage hold down circuit, this circuit shall
be checked to operate correctly.See item "How to check the high
voltage hold down circuit".
AC VOLTMETER
(HAVING 1000 /V,
OR MORE SENSITIVITY)
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
1500 10W
0.15 F AC-TYPE
GOOD EARTH GROUND
PWB
White line side
WHT
PW
POWER CORD
REPLACEMENT WARNING.
Connecting the white line side of power
cord to "WHT" character side.
A V
This mark shows a fast
operating fuse, the
letters indicated below
show the rating.

1-4 (No.YA050B)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 FEATURES
VIDEO STATUS
Expression of a favorite screen can be chosen by the VIDEO
STATUS function.
COMPONENT INPUT
Since the component signal input terminal is equipped, it
reappears direct without deteriorating the signal from DVD.
V-CHIP
Since the V-CHIP is built in, it can choose, view and listen to a
healthy program.
MTS STEREO
The voice multiplex function of the MTS system is built in.
(MTS = Multi channel Television Sound system)
RETURN PLUS
You program a specific channel to return to while scanning
through the channels using the CH+ and CH - keys.
2.2 HOW TO IDENTIFY MODELS
How to recognize from the appearance of the model concerned is written below. Please distinguish from several contents currently
printed on the rating label
AV-27530
MODEL NAME
SCA
DISTINGUISH NAME
MODEL NO.
AC 120V 60Hz
W
TV SCREEN SIZE : DIAGONAL
INCHES
CHASSIS NO.
MANUFACTURED
SERIAL NO.
VIDEO EQUIPMENT
4C43
ME

(No.YA050B)1-5
2.3 TECHNICAL INFORMATION
2.3.1 MAIN MI-COM (CPU) PIN FUNCTION
Pin
No. Pin name I/O Function Pin
No. Pin name I/O Function
1 A_MUTE O Audio muting [Muting : H] 29 YC_GND - GND
2 AFT1 I AFT voltage for tuner (Tuning frequency control) 30 V1_IN I Not used
3 KEY I Key scan for front control [No signal : H] 31 ABCL I Current for automatic beam (brightness)/contrast limit
4 uP_DVss - GND 32
MONITOR_OUT O Not used
5 Reset I CPU reset 33 BLACK_DET - Black level detection filter
6 8MHz_OUT O CPU system clock : 8MHz oscillation 34 SVM_OUT O Y signal for velocity scan modulation
7 8MHz_IN I CPU system clock : 8MHz oscillation 35 APL_FIL - Average picture level filter
8 TEST - GND 36 APC_FIL - Automatic phase control filter
9 uP_DVDD - 5V 37 fsc_OUT O Color sub carrier (3.58MHz) for 3-line digital comb filter [IC5201]
10 AGC_MUTE O AGC muting for tuner (when channel select) [Muting : H] 38 YC_Vcc - 5V (for video process circuit)
11 uP_VVSS - GND 39 R_OUT O R signal
12 TV_HGND - GND 40 G_OUT O G signal
13 FBP_SCP I Flyback pulse (H. pulse) 41 B_OUT O B signal
14 HOUT O H. drive (oscillation) 42 RGB_Vcc - 9V (for RGB process circuit)
15 H_Vcc - 9V (for H. oscillation start) 43 IK_IN I Not used
16 HAFC_1 - H. AFC filter 44 TV_DGND - GND
17 Vsaw - V. saw filter 45 uP_AGND - GND
18 VOUT O V. drive 46 uP_AVdd - 5V
19 EW_OUT O Parabola waveform (for sidepin correection) 47 MAIN_POWER O Power on/off switching control [Powen on : L]
20 X-RAY I X-ray detection (for protection) [Detection : H] 48 HAZARD I Not used
21 Ys I Not used 49 SDAO I/O Data for Inter IC control bus (for various devices)
22 Cb_IN I Cb (external) signal 50 SCLO O Clock for Inter IC control bus (for various devices)
23 Y_IN I Y (external) signal 51 SDA1 I/O Data for Inter IC control bus (for main memory)
24 Cr_IN I Cr (external) signal 52 AGC_ADJUST I AGC adjustment
25 TV_DVcc - 3.3V 53 SCL1 O Clock for Inter IC control bus (for main memory)
26 V3IN/CIN I Chroma signal (for YC separation output) 54 LED O POWER / ON TIMER LED lndication [lighting : L]
27 EHT_IN I Not used 55 REMOCON I Remote control sensor input [No input : H]
28 V2_IN/Y_IN I Y signal (for YC separation output) 56 COMPULINK I Not used

1-6 (No.YA050B)
SECTION 3
DISASSEMBLY
3.1 DISASSEMBLY PROCEDURE
3.1.1 REMOVING THE REAR COVER
(1) Disconnect the power plug.
(2) Remove the 7 screws [A].
(3) Remove the 4 screws [B].
(4) Withdraw the REAR COVER backward.
3.1.2 REMOVING THE MAIN PWB
• Remove the REAR COVER.
(1) Raise the MAIN PWB, and remove the PWB STOPPER
from the cabinet.
(2) Withdraw the MAIN PWB backward.
(If necessary, remove the wire clamp, connectors etc.)
3.1.3 REMOVING THE SPEAKER
• Remove the REAR COVER.
(1) Remove the 2 screws [C].
(2) Remove the SPEAKER.
(3) Follow the same steps when removing the other hand
SPEAKER.
NOTE :
When remove the 2 screws [C] of the SPEAKER, remove the
lower side screw first, and then remove the upper one.
3.1.4 CHECKING THE MAIN PWB
To check the PW Board from back side.
(1) Pull out the MAIN PWB (refer to REMOVING THE MAIN
PWB).
(2) Erect the MAIN PWB vertically with the HVT side facing up
so that you can easily check the back side of the PW board.
CAUTION :
• When erecting the MAIN PWB, be careful so that there will
be no contacting with other PW Board.
• Before turning on power, make sure that the wire connector
is properly connected.
•When conducting a check with power supplied, be sure
to confirm that the CRT EARTH WIRE (BRAIDED ASS'Y)
is connected to the CRT SOCKET PWB.
3.1.5 WIRE CLAMPING AND CABLE TYING
(1) Be sure to clamp the wire.
(2) Never remove the cable tie used for tying the wires together.
Should it be inadvertently removed, be sure to tie the wires
with a new cable tie.

(No.YA050B)1-7
Fig.1
REAR COVER
CRT SOCKET PWB
SPEAKER
FRONT CABINET
MAIN PWB
PWB STOPPER
D
D
A
B
POWER CORD

1-8 (No.YA050B)
3.2 MEMORY IC REPLACEMENT
• This model uses the memory IC.
• This memory IC stores data for proper operation of the video and drive circuits.
• When replacing, be sure to use an IC containing this (initial value) data.
3.2.1 MEMORY IC REPLACEMENT PROCEDURE
1. Power off
Switch off the power and disconnect the power plug.
2. Replace the memory IC
Be sure to use a memory IC written with the initial setting data.
3. Power on
Connect the power cord to the wall outlet and switch on the
power.
4. Receiving channel setting
Refer to the OPERATING INSTRUCTIONS (USER'S GUIDE)
and set the receive channels (Channels Preset) as described.
5. User settings
Check the user setting items according to the "SETTINGS OF
FACTORY SHIPMENT" table.
Where these do not agree, refer to the OPERATING
INSTRUCTIONS (USER'S GUIDE) and set the items as
described.
6. SERVICE MODE setting
Verify what to set in the SERVICE MODE, and set whatever is
necessary(Fig.1) .
Refer to the SERVICE ADJUSTMENT for setting.
3.2.2 SERVICE MODE SETTING ITEMS
Fig.1
Setting items Settings Item No.
1. V/C(S)
(Video setting) Adjust S01~S21
2. DEF(D)
(Deflection setting) Adjust D01~D12
3. SOUND(A)
(Audio setting) Adjust A01~A09
4. OTHERS [Do not adjust]
(Factory setting) Fixed F01~F09
7. LOW LIGHT
(White balance setting) Adjust ---
8. HIGH LIGHT
(White balance setting) Adjust ---
9. VCO
(VCO setting) Adjust ---
11. I2C BUS [Do not adjust]
(I2C BUS setting) Fixed ---
1.
3.
7.
9.
11.
2.
4.
8.
SERVICE MENU
DEF(D)
OTHERS(F)
HIGH LIGHT
SELECT BY
OPERATE BY EXIT BY EXIT
V/C(S)
SOUND(A)
LOW LIGHT
VCO
I2C BUS

(No.YA050B)1-9
3.2.3 SETTINGS OF FACTORY SHIPMENT
3.2.3.1 BUTTON OPERATION 3.2.3.2 REMOTE CONTROL DIRECT OPERATION
3.2.3.3 REMOTE CONTROL MENU OPERATION
(1) PICTURE ADJUST
(2) SOUND ADJUST
(3) CLOCK / TIMERS
(4) INITIAL SETUP
Setting item Setting position
POWER Off
CHANNEL CH-02
VOLUME 10
Setting item Setting position
INPUT TV
CHANNEL CH-02
VOLUME 10
MUTING OFF
DISPLAY OFF
SLEEP TIMER OFF
VIDEO STATUS DYNAMIC
Setting item Setting position
TINT 0
COLOR 0
PICTURE +8
BRIGHT 0
DETAIL +8
NOISE MUTING ON
Setting item Setting position
BASS 0
TREBLE 0
BALANCE 0
MTS STEREO
Setting item Setting position
SET CLOCK OFF
ON / OFF TIMER OFF
Setting item Setting position
LANGUAGE ENG.
CLOSED CAPTION OFF(CC1/T1)
FRONT PANEL LOCK OFF
AUTO SHUT OFF OFF
V-CHIP OFF

1-10 (No.YA050B)
3.3 REPLACEMENT OF CHIP COMPONENT
3.3.1 CAUTIONS
(1) Avoid heating for more than 3 seconds.
(2) Do not rub the electrodes and the resist parts of the pattern.
(3) When removing a chip part, melt the solder adequately.
(4) Do not reuse a chip part after removing it.
3.3.2 SOLDERING IRON
(1) Use a high insulation soldering iron with a thin pointed end of it.
(2) A 30w soldering iron is recommended for easily removing parts.
3.3.3 REPLACEMENT STEPS
1. How to remove Chip parts
[Resistors, capacitors, etc.]
(1) As shown in the figure, push the part with tweezers and
alternately melt the solder at each end.
(2) Shift with the tweezers and remove the chip part.
[Transistors, diodes, variable resistors, etc.]
(1) Apply extra solder to each lead.
(2) As shown in the figure, push the part with tweezers and
alternately melt the solder at each lead. Shift and remove
the chip part.
NOTE :
After removing the part, remove remaining solder from the
pattern.
2. How to install Chip parts
[Resistors, capacitors, etc.]
(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the
solder. Then heat and melt the solder at both ends of the
chip part.
[Transistors, diodes, variable resistors, etc.]
(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the
solder.
(3) First solder lead Aas indicated in the figure.
(4) Then solder leads Band C.
SOLDER SOLDER
AB
C
A
B
C

(No.YA050B)1-11
SECTION 4
ADJUSTMENT
4.1 ADJUSTMENT PREPARATION
(1) There are 2 ways of adjusting this TV : One is with the
REMOTE CONTROL UNIT and the other is the
conventional method using adjustment parts and
components.
(2) The adjustment using the REMOTE CONTROL UNIT is
made on the basis of the initial setting values. The
setting values which adjust the screen to the optimum
condition can be different from the initial setting
values.
(3) Make sure that connection is correctly made AC to AC
power source.
(4) Turn on the power of the TV and measuring instruments for
warming up for at least 30 minutes before starting
adjustments.
(5) If the receive or input signal is not specified, use the most
appropriate signal for adjustment.
(6) Never touch the parts (such as variable resistors,
transformers and condensers) not shown in the adjustment
items of this service adjustment.
4.2 PRESET SETTING BEFORE ADJUSTMENTS
Unless otherwise specified in the adjustment items, preset the
following functions with the REMOTE CONTROL UNIT.
4.3 MEASURING INSTRUMENT AND FIXTURES
• DC voltmeter (or digital voltmeter)
• Oscilloscope
• Signal generator (Pattern generator) [NTSC]
• TV audio multiplex signal generator
• Remote control unit
4.4 ADJUSTMENT ITEMS
CHECK ITEM
• B1 VOLTAGE check
• HIGH VOLTAGE HOLD DOWN check
FOCUS
• FOCUS adjustment
DEFLECTION CIRCUIT
• V. SIZE / V. POSITION adjustment
• H. POSITION / H. SIZE / SIDE PIN adjustment
VIDEO CIRCUIT
• WHITE BALANCE(High Light & Low Light) adjustment
• SUB BRIGHT adjustment
• SUB CONTRAST adjustment
MTS CIRCUIT
• MTS INPUT LEVEL adjustment
• MTS SEPARATION adjustment
Item Preset value
VIDEO STATUS STANDARD
PICTURE adjustment All 00
SOUND adjustment All 00

1-12 (No.YA050B)
4.5 ADJUSTMENT LOCATIONS
CRT SOCKET PWB
(Within MAIN PWB ASS'Y)
T
TP-E
(SOLDER SIDE)
TOP
CRT EARTH
(BRAIDED ASS'Y)
E1
TP-B
MAIN PWB
POWER
FRONT
HV
UPPER : FOCUS
LOWER : SCREEN
X
TUNER
MEMORY
IC201
IC702
IC421
HVT
S
U
T
PW
DEG
V. CENTER SW
CW TRANSF.
IC851
SPEAKER
VOL+ VOL- CH+ CH- MENU
DOWN UP
POWER
IC901
F901
U
T111
R926
S401 1:X-RAY
2:GND
3:X-RAY
TP-91(B1)
TP-E( )
1
41
5
51
1
1
4
6

(No.YA050B)1-13
4.6 BASIC OPERATION OF SERVICE MODE
4.OTHERS(F) [Fixed value]
F01
3.SOUND(A)
A01 IN LEVEL
2.DEF(D)
D01 V FREQ
RF 4 : 3 STD LOW
1.V/C(S)
RF 4 : 3 STD LOW
S01 BRIGHT
1.V/C(S) 2.DEF(D)
3.SOUND(A) 4.OTHERS(F)
7.LOW LIGHT 8.HIGH LIGHT
9.VCO
11.I2C BUS
SELECT BY
OPERATE BY EXIT BY EXIT
SERVICE MENU
BRIGHT
7.LOW LIGHT
SUB MENU
MAIN MENU
11.I2C BUS [Fixed value]
I2C BUS ON
8.HIGH LIGHT
9.VCO
TOO HIGH GOOD TOO LOW
SYNC: YES
AFC ON
FINE 0

1-14 (No.YA050B)
4.6.1 TOOL OF SERVICE MODE OPERATION
Operate the SERVICE MODE with the REMOTE CONTROL UNIT.
4.6.2 SERVICE MODE ITEMS
In general, basic setting (adjustments) items or verifications are performed in the SERVICE MODE.
4.6.3 HOW TO ENTER THE SERVICE MODE
(1) Set to 0 minutes using the [SLEEP TIMER] key.
(2) Press the [VIDEO STATUS] key and [DISPLAY] key
simultaneously while “0 MIN” is displayed, then enter the
SERVICE MODE.
4.6.4 HOW TO STORE OF SETTING VALUE
The setting value will be stored automatically when release the
REMOTE CONTROL UNIT keys
4.6.5 HOW TO EXIT THE SERVICE MODE
Press the [EXIT] key to exit the SERVICE MODE.
1. V/C (S) This sets the setting values of the VIDEO circuit.
2. DEF (D) This sets the setting values of the DEFLECTION circuit.
3. SOUND (A) This sets the setting values of the AUDIO circuit.
4. OTHERS (F) This sets the setting values of the factory settings. [Do not adjust]
7. LOW LIGHT This sets the setting values of the WHITE BALANCE (LOW LIGHT) control circuit.
8. HIGH LIGHT This sets the setting values of the WHITE BALANCE (HIGH LIGHT) control circuit.
9. VCO This sets the setting values of the VCO control circuit.
11. I2C BUS This sets the setting values of the I2C BUS control circuit. [Do not adjust]
SERVICE MODE SELECT KEY
123
456
789
0
VIDEO
STATUS
POWER
DISPLAY
MUTING
CHANNEL
PLAY
STOP
TV VCR POWER
VCR CONTROL
C.C.
MENU EXIT
GAME SLEEP INPUT
100 RETURN
CH
VOL VOL
CH
REW FF
REC PAUSE
RM-C203
NUMBER
DISPLAY
VOL-
MENU
VIDEO STATUS POWER
SLEEP TIMER
CH+
VOL+
CH-
EXIT

(No.YA050B)1-15
4.6.6 SERVICE MODE SETTING
1. V/C, 2. DEF
• Press [CH+] / [CH-] key
For scrolling up/down the adjustment item.
• Press [VOL+] / [VOL-] key
For scrolling up/down the data values.
NOTE:
The setting value will be stored automatically when release
the REMOTE CONTROL UNIT keys.
(1) INPUT SIGNAL
(2) ASPECT
(3) VIDEO STATUS
(4) COLOR TEMPERATURE
3. SOUND (A)
• Press [CH+] / [CH-] key
For scrolling up/down the adjustment item.
• Press [VOL+] / [VOL-] key
For scrolling up/down the data values.
NOTE:
The setting value will be stored automatically when release
the REMOTE CONTROL UNIT keys.
7. LOW LIGHT
The settings for WHITE BALANCE(LOW LIGHT) control
circuit.
NOTE:
The setting value will be stored automatically when release
the REMOTE CONTROL UNIT keys.
8. HIGH LIGHT
The settings for WHITE BALANCE(HIGH LIGHT) control
circuit.
NOTE:
The setting value will be stored automatically when release
the REMOTE CONTROL UNIT keys.
9. VCO
The setting for VCO control circuit.
RF : Antenna input
COMP : External (Component) input
EXT : External (S / Composite) input
4 : 3 : 4 : 3 screen mode
STD : STANDARD
THEA : SPORTS
LOW : White balance low mode
RF 4 : 3 STD LOW
SETTING NO.
INPUT
SIGNAL
A
SPECT
SETTING ITEM
SETTING VALUE
VIDEO
STATUS
COLOR
TEMPERATURE
SETTING NO.
SETTING ITEM
SETTING VALUE
A01 IN LEVEL
BRIGHT
G CUTOFF B CUTOFF
R CUTOFF
SETTING VALUE
SETTING VALUESETTING ITEM
B DRIVER DRIVE
SETTING VALUE
TOO HIGH GOOD TOO LOW
SYNC: YES
AFC OFF
FINE 0
VCO adjustment status (AFC level)
Setting value
AFC SW
SYNC INPUT

1-16 (No.YA050B)
4.7 INITIAL SETTING VALUE OF SERVICE MODE
(1) Adjustment of the service menu is made on the basis of the initial setting values. however, the new setting values which displays
on the screen in its optimum condition may differ from the initial setting value.
(2) Do not change the initial setting values of the items not listed in "ADJUSTMENT PROCEDURE".
(3) "---" is impossible to adjust.
4.7.1 [1. V/C(S)]
No. Setting item Variable
range
Initial setting value
RF
EXTERNAL (S / COMPOSITE) EXTERNAL (COMPONENT)
STANDARD SPORTS STANDARD SPORTS STANDARD SPORTS
S01 BRIGHT 000 - 127 064 --- --- --- --- ---
S02 PICTURE 000 - 127 058 --- --- --- --- ---
S03 COLOR 000 - 127 053 --- --- --- 063 ---
S04 TINT 000 - 127 053 --- --- --- 065 ---
S05 DETAIL 000 - 063 035 --- 040 --- 040 ---
S06 BRIGHT +- -032 - +032 --- ±000 -001 --- -005 ---
S07 PICT+- -032 - +032 --- -015 +001 --- ±000 ---
S08 COLOR +- -032 - +032 --- -003 -001 --- --- ---
S09 TINT+- -032 - +032 --- -006 +016 --- --- ---
S10 DETAIL+- -032 - +032 --- +003 --- --- --- ---
No. Setting item Variable
range
Initial setting value
EXTERNAL (S / COMPOSITE) EXTERNAL (COMPONENT)
STANDARD SPORTS STANDARD SPORTS
S11 R CUT OFF 000 - 255 030 --- --- ---
S12 G CUT OFF 000 - 255 030 --- --- ---
S13 B CUT OFF 000 - 255 030 --- --- ---
S14 R DRIVE 000 - 127 064 --- --- ---
S15 B DRIVE 000 - 127 064 --- --- ---
S16 R CUT +- -128 - +127 --- ±000 -005 ---
S17 G CUT +- -128 - +127 --- ±000 +005 ---
S18 B CUT +- -128 - +127 --- ±000 -005 ---
S19 R DRV +- -128 - +127 --- +007 +003 ---
S20 B DRV +- -128 - +127 --- -009 +003 ---
S21 AGC ADJ 000 - 127 080 080 080 080

(No.YA050B)1-17
4.7.2 [2. DEF(D)]
4.7.3 [3. SOUND(A)] 4.7.4 [4. OTHERS(F)] [Do not adjust : All fixed]
No. Setting item Variable
range Initial setting value
RF EXTERNAL (S / COMPOSITE)
D01 AFC GAIN 000 - 003 000 002
D02 H POSI 000 - 031 010 010
D03 V SIZE 000 - 125 040 040
D04 V S CORR 000 - 015 003 003
D05 V LIN 000 - 015 012 012
D06 H SIZE 000 - 063 032 032
D07 WVMT TOP 000 - 003 000 000
D08 WVMT BTM 000 - 003 000 000
D09 EWCR TOP 000 - 031 016 016
D10 EWCR BTM 000 - 031 016 016
D11 EW PARA 000 - 063 026 026
D12 BLANK SW 000 - 001 000 000
No. Setting item Variable
range Initial setting value
A01 IN LEVEL 000 - 063 017
A02 FH MON 000 - 001 000
A03 ST VCO 000 - 063 036
A04 PIL CAN 000 - 001 000
A05 FILTER 000 - 063 035
A06 LOW SEP 000 - 063 007
A07 HI SEP 000 - 063 018
A08 5FH MON 000 - 001 000
A09 SAP VCO 000 - 063 037
No. Setting item Variable
range Initial setting value
F01 (Not display) 000 - 255 028
F02 (Not display) 000 - 255 083
F03 (Not display) 000 - 063 042
F04 (Not display) 000 - 255 093
F05 (Not display) 000 - 063 011
F06 (Not display) 000 - 255 062
F07 (Not display) 000 - 255 003
F08 (Not display) 000 - 255 005
F09 (Not display) 000 - 001 001

1-18 (No.YA050B)
4.8 ADJUSTMENT PROCEDURE
4.8.1 CHECK ITEM
4.8.2 TUNER / IF CIRCUIT
4.8.3 FOCUS
Item Measuring
instrument Test point Adjustment part Description
B1 POWER
SUPPLY Signal generator
DCvoltmeter
R927 : TP-91
HEAT SINK
(IC421) : TP-E
[MAIN PWB]
(1) Receive the black and white signal. (color off)
(2) Connect the DC voltmeter to the TP-E and TP-91
(R927).
(3) Confirm that the voltage is DC134V (-2.5V / +2V).
HIGH VOLTAGE
HOLD DOWN Resistor
(20.7k Ω , 1/4W)
X connector
1-pin : X-RAY2
3-pin : X-RAY1
[MAIN PWB]
• After repairing the high voltage hold down circuit. This
circuit shall be checked to operate correctly.
(1) Turn the power switch to on.
(2) Refer to the figure, connect the resistor between X
connector 1-pin and 3-pin.
(3) Make sure that the screen picture disappeares.
(4) Disconnect the power plug.
(5) Remove the resistor.
(6) Again connect the power plug.
(7) Turn the power switch to on.
(8) Make sure that the normal picture is displayed on the
screen.
T521
RESISTOR
HEATER
X CONNECTOR3 2 1
20.7 k 1%
Item Measuring
instrument Test point Adjustment part Description
IF VCO Remote
control unit [9.VCO]
CW transf. (T111)
[MAIN PWB]
• It must not adjust without inputting the RF signal.
(1) Receive the any broadcast.
(2) Select 9.VCO from the SERVICE MODE.
(3) Change the "AFC" to "OFF" and "FINE" to "0".
(4) Confirm that the color change from "TOO HIGH" to
"TOO LOW" by CW transf. on MAIN PWB, and
check the "SYNC" is "YES".
(5) Adjust CW transf. until "GOOD" letters turns green.
And then confirm that the "SYNC" is "YES" again.
Adjustment can be done in this statement.
(6) It return the "AFC" to "ON".
(7) Press the [EXIT] key to exit the 9.VCO.
TOO HIGH GOOD TOO LOW
SYNC: YES
AFC ON
FINE 0
AFC STATUS
(Turn to green)
Item Measuring
instrument Test point Adjustment part Description
FOCUS Signal
generator FOCUS VR [In HVT] (1) Receive the crosshatch signal. (2) While watching at the screen, adjust the FOCUS VR
to the vertical and horizontal lines will be thinnest
and sharpest center horizontal line.
(3) Make sure that the picture is in focus even when the
screen gets darkened.

(No.YA050B)1-19
4.8.4 DEFLECTION CIRCUIT
Item Measuring
instrument Test point Adjustment part Description
V. SIZE /
V. POSITION Signal generator
Remote
control unit
[2.DEF (D)]
D03: V SIZE
V. CENTER SW
(S1401)
[MAIN PWB]
(1) Receive the crosshatch signal.
(2) Select 2.DEF(D) from the SERVICE MODE.
(3) Adjust V. CENTER SW to agree the vertical center
with display center.
(4) Select < D03 > (V SIZE).
(5) Adjust < D03 > to the vertical screen size become
setting value is 90%.
H. SIZE /
H. POSITION /
SIDE PIN
Signal
generator
Remote
control unit
[2.DEF (D)]
D02: H POSI
D06: H SIZE
D11: EW PARA
D09: EWCR TOP
D10: EWCR BTM
(1) Receive the crosshatch signal.
(2) Select 2.DEF(D) from the SERVICE MODE.
(3) Select < D02 > (H POSI).
(4) Adjust < D02 > to the left width and right width of the
crosshatch screen becomes equal.
(5) Select < D06 > (H SIZE).
(6) Adjust < D06 > to the horizontal screen size become
setting value is 90%.
(7) Select < D11 > (EW PARA).
(8) Adjust < D11 > to vertical line at both side to become
straight.
(9) If it is necessary, readjust step 3 to 8.
NOTE:
If it is not straight at the vertical upper and bottom corner
line, adjust the upper and bottom conrner pin by < D09 >
(EWCR TOP) amd < D10 > (EWCR BTM).
Screen
size
Picture
size
100%
Picture size 100%
Screen size

1-20 (No.YA050B)
4.8.5 VIDEO CIRCUIT
Item Measuring
instrument Test point Adjustment part Description
WHITE
BALANCE
(LOW LIGHT)
Signal
generator
Remote
control unit
[1.V/C (S)]
S01: BRIGHT
S11: R CUTOFF
S12: G CUTOFF
S13: B CUTOFF
[7.LOW LIGHT]
SCREEN VR
[in HVT]
(1) Receive the all black signal.
(2) Select the 1.V/C (S) from the SERVICE MODE.
(3) Confirm the initial setting value of < S11 > (R
CUTOFF), < S12 > (G CUTOFF), < S13 > (B
CUTOFF) and < S01 > (BRIGHT).
(4) Return to the main menu in SERVICE MODE.
(5) Select the 7.LOW LIGHT from the SERVICE MODE.
(6) Display a single horizontal line by pressing the [1]
key.
(7) Turn the SCREEN VR all the way to the left.
(8) Turn the SCREEN VR gradually to the right from the
left until either one of the red, blue or green colors
appears faintly.
(9) Adjust the two colors which did not appear until the
single horizontal line that is displayed becomes
white using the [4] to [9] keys.
(10) Turn the SCREEN VR until the single horizontal line
is displayed faintly.
(11) Press the [2] key to cancel the single horizontal line
mode.
(12) Return to the main menu in SERVICE MODE.
(13) Select the 1.V/C (S) from the SERVICE MODE.
(14) Adjust the BRIGHT level to become the black
component shines white slightly by < S01 >.
(15) Confirm that whether the color ingredient of R, G, or
B is visible to the black component, which shines
white slightly.
(16) When the color ingredient can be seen, two colors
other than a visible color are adjusted, and it is made
to look white.
(17) Return the value of < S01 > to initial setting value.
•The[3] (EXIT) key is the cancel key for the WHITE
BALANCE.
WHITE
BALANCE
(HIGH LIGHT)
Signal
generator
Remote
control unit
[1.V/C (S)]
S14: R DRIVE
S15: B DRIVE
[8.HIGH LIHGT]
(1) Receive the 100% all white signal.
(2) Select the 1.V/C (S) from the SERVICE MODE.
(3) Set the initial setting value of < S14 > (R DRIVE) and
< S15 > (B DRIVE).
(4) Return to the main menu in SERVICE MODE.
(5) Select the 8.HIGH LIGHT from the SERVICE
MODE.
(6) Adjust the screen until it becomes white using the
[4], [6], [7] and [9] keys.
•The[3] (EXIT) key is the cancel key for the WHITE
BALANCE.
SUB BRIGHT Remote
control unit [1.V/C (S)] S01: BRIGHT (1) Receive any broadcast. (2) Select the 1.V/C (S) from the SERVICE MODE.
(3) Select < S01 > (BRIGHT).
(4) Set the initial setting value of < S01 >.
(5) If the brightness is not the best with the initial setting
value, make fine adjustment of < S01 > until you get
the optimum brightness.
REMOTE CONTROL UNIT
H.LINE ON
R CUTOFF B CUTOFF
H.LINE OFF EXIT
R CUTOFF B CUTOFF
G CUTOFF
G CUTOFF
R DRIVE
R DRIVE
B DRIVE
B DRIVE
REMOTE CONTROL UNIT
EXIT