Page 1
A
A
SERVICE MANUAL
COLOR TELEVISION
AV-27D302
/S
V-27D302
V-27D202
BASIC CHASSIS
FD
AV-27D302
AV-27D202
AV-27D202
/R
/S
/R
CONTENTS
!
SPECIFICATIONS
!
SAFETY PRECAUTIONS
!
FEATURES
!
MAIN DIFFERENCE LIST
!
HOW TO IDENTIFY MODELS
!
FUNCTIONS
!
SPECIFIC SERVICE INSTRUCTIONS
!
SERVICE ADJUSTM ENTS
!
PARTS LIST
★
OPERATING INSTRUCTIONS
★
STANDARD CIRCUIT DIAGRAM
1
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COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.
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No.51788
Mar. 2001
Mar. 2001
Page 2
A
V-27D302
A
V-27D202
SPECIFICATIONS
Items
Dimensions (W
Mass
Reception Format
Reception Range
VHF, UHF
CATV
TV/CATV Total Channel
Intermediate Frequency
Color Sub Carrier
Power Input
Power Consumption
D)
××××H××××
UHF Band
Low Band
High Band
Super Band
Hyper Band
Ultra Band
Sub Mid Band
Video IF Carrier
Sound IF Carrier
VL Band
VH Band
Mid Band
29-5/8”×23-1/4”×23” / 752mm×590mm×531mm
70.8 Ibs / 32.2 kg
NTSC, BTSC System (Multi-Channel Sound)
(02～06) 54MHz～88MHz
(07～13) 174MHz～216MHz
(14～69) 470MHz～806MHz
(02～06, A-8) by (02～06&01)
(07～13) by (07～13)
(A～1) by (14～22)
(J～W) by (23～36)
(W+1～W+28) by (37～64)
(W+29～W+84) by (65～125)
(A8, A4～A1) by (01, 96～99)
181 Channels
45.75MHz
41.25MHz (4.5MHz)
3.58MHz
120V AC, 60Hz
113W
AV-27D302/S
AV-27D302/R
Contents
AV-27D202/S
AV-27D202/R
(54MHz～804MHz)
Picture Tube
High Voltage
Speaker
Audio Power Output
Input terminal
Input 1 S-Video
Video(V)
Audio(L, R)
Input 2 Component Video
Video / Y, Pb, Pr
Audio(L, R)
Output terminal
Variable Audio Output (R/L)
Antenna terminal
Remote Control Unit
27” (68cm) Measured Diagonally
29kV±1kV (at zero beam current)
2“×3-1/2” / 5×9cm Oval type×2
1.2W + 1.2W
Built in BBE sound function
Y: 1Vp-p Positive (negative sync provided, when terminated with 75Ω)
C: 0.286V
1Vp-p, 75Ω (RCA pin jack)
500mVrms ( -4dBs ), High Impedance (RCA pin jack)
1Vp-p 75Ω(positive sync)
50mVrms (-4dBs), High Impedance (RCA pin jack)
More than 0～1550mVrms (+6dBs)
Low impedance (400Hz when modulated 100%) (RCA pin jack)
75Ω(VHF/UHF) Terminal, F-Type Connector
RM-C303G-1A
(AA/R6/UM-3 battery×2)
p-p
(burst signal, when terminated with 75Ω)
Design & specifications are subject to change without notice.
2
No.51788
Page 3
A
A
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 visual inspection nor c an the protection
afforded by 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 (
in Service manual.
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
(NEUTRAL) side ground or EARTH side ground when
repairing.
Some model's power circuit is partly diff erent in the GND. The
difference of the GND is shown by the LIVE : (") side GND,
the ISOLATED(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 with a measuring apparatus (oscilloscope etc.)
the LIVE side GND and ISOLATED(NEUTRAL) side GND or
EARTH side GND at the same time.
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
ADJUSTMENT OF B1 POWER SUPPLY).
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, crack ed 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 10kΩ 2W 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.
The use of a substitute replacement which
) on the parts list
!!!!
V-27D302
V-27D202
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, screwheads, earphone jack, control
shafts, etc.) to be sure the product is safe to operate without
danger of electrical shock.
(1)
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
rated 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.
(2)
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 c urrent must not
exceed 0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 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 1000 ohms per volt or more sensitivi ty in the
following manner. Connect a 1500Ω 10W 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 t o each exposed metal
part, particularly any exposed metal part having a return path to
the chassis, and measure the AC voltage across the res istor.
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.).
AC VOLTMETER
(HAVING 1000
GOOD
EARTH
GROUND
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 "
circuit
This mark shows a fast
operating fuse, the
letters indicated below
show the rating.
0.15μF AC-TYPE
Ω
10W
1500
How to check the high voltage hold down
".
OR MORE SENSITIVITY)
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
Ω
/V,
A V
No. 51788
3
Page 4
A
V-27D302
A
V-27D202
FEATURES
New chassis design enables use of a single board with
"
simplified c i rcuitry.
Users can make fun to connect the Digital Video Disk player with
"
the component video signal i nput terminal.
Provided with miniature tuner (TV/CATV).
"
Multifunctional remot e control permits picture adjustment.
"
Adoption of the CHANNEL GUARD function prevents the
"
specific channels from being selected, unless the “ID number” is
key in.
I2C bus control utilizes single chip ICs.
"
Adoption of the VIDEO ST A T US function.
"
Adoption of the ON/OFF TIMER funct i on.
"
"
"
"
"
"
"
"
"
"
MAIN DIFFERENCE LIST
!!!!
Parts Name
MAIN PWB SFD-1001A-M2 SFD-1002A-M2 SFD-1001A-M2 SFD-1002A-M2
!
ITC TUBE A68QDN891X001 A68ADT25X01 A68QDN891X001 A68ADT25X01
Model name
AV-27D302
/S
AV-27D302
Built-in V-CHIP system.
With 75ΩV/U in common (F-Type) ANT Terminal.
SLEEP TIMER for setti ng i n real t i me.
Closed-caption broadcasts can be viewed.
Built-in MTS system.
Built-in HYPER-SURROUND system.
S-VIDEO input terminal for taking best advantage of Super VHS.
Variable Audio output term i nal .
2 LINE Digital Comb filter Improved pict ure qual i ty.
/R
AV-27D202
/S
AV-27D202
/R
!
FRONT CABI. ASS’Y GQ10018-001A-A GQ10018-002A-A
DOOR GQ30024-002A-A GQ30024-001A-A
JVC MARK CM48006-007-C CM48006-006-C
POWER KNOB GQ30026-002A-A GQ30026-001A-A
CONTROL KNOB GQ30025-002A-A GQ30025-001A-A
HOW TO IDENTIFY MODELS
The difference between AV-27D302/S and AV-27D302/R is in the PICTURE TUBE .
As the result of the difference in picture tube, the MAIN PWB al so differs.
In the same way, the diff erence between AV-27D202/S and AV-27D202/R is i n the PICTURE TUBE too.
!
Parts name
RATING LABEL
!
Model
AV-27D302
Indicated AV-27D302 Indicated AV-27D302 Indicated AV-27D202 Indicated AV-27D202
/S
AV-27D302
/R
AV-27D202
/S
AV-27D202
/R
Indicated “S”
4
Indicated “R”
No.51788
Indicated “S”
Indicated “R”
Page 5
A
A
FUNCTIONS
FRONT PANEL CONTROL
■■■■
REAR TERMINAL
■■■■
V-27D302
V-27D202
①②③④
①
VIDEO INPUT TERMINAL
②
AUDIO L INPUT TERMINAL
③
AUDIO R INPUT TERMINAL
④
MENU KEY
⑤
CHANNEL -/+ KEY (OPERATE KEY)
⑥
VOLUME -/+ KEY
⑦
ON TIMER LED
⑧
POWER BUTTON
REMOTE CONTROL UNIT
■■■■
[RM-C303G]
⑤⑥ ⑦⑧
②
①
①
AUDIO OUTPUT TERMINAL
②
INPUT1 TERMINAL(S, V, L, R)
③
INPUT2 TERMINAL(V/Y, P
④
AERIAL SOCKET
③
④
R
, PB, L, R)
①
②
③
④
⑤
⑥
⑦
⑧
⑨
⑩
⑪
⑫
⑬
⑭
⑮
⑯
No.51788
①
TV / CATV
②
VIDEO STATUS
③
BBE
④
DISPLAY
⑤
SLEEP TIMER
⑥
HYPER SURROUND
⑦
MUTING
⑧
MENU
⑨
POWER
⑩
VCR / DVD
⑪
INPUT
⑫
CHANNEL KEYS
⑬
LIGHT
⑭
V-CHIP
⑮
EXIT
⑯
VCR CONTROL KEYS
5
Page 6
A
V-27D302
A
V-27D202
SPECIFIC SERVICE INSTRUCTIONS
DISASSEMBLY PROCEDURE
REMOVING THE REAR COVER
1. Disconnect the power plug from wall outlet.
11
2. As shown in the Fig.1, remove the
3. As shown in Fig.1, remove the
4. Then remove the REAR COVER toward you.
screws marked
4
screws marked
""""
.
!!!!
.
CHECKING THE PW BOARD
To check the PW Board from back side.
1. Pull out the chassis (refer to REMOVING THE CHASSIS).
2. Erect the chassis vertically so that you can easily check the back
side of the PW Board.
REMOVING THE CHASSIS
After removing the REAR COVER.
"
1. Slightly raise the both sides of the chassis by hand and remove the
two claws under the both sides of the chassis from the front
cabinet.
2. Withdraw the chassis backward.
(If necessary, remove the wire clamp, connectors etc.)
REMOVING THE SPEAKER
After removing the rear cover.
"
1. As shown in Fig. 1, removing the
remove the speaker.
2. Follow the same steps when removing the other hand speaker.
NOTE :
When removing the screws marked
remove the lower side screw first, and then remove the
upper one.
2
screws marked
of the speaker,
####
####
,
then
CAUTION
When erecting the chassis, 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
connected to the CRT SOCKET PW board.
’’’’
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 s ure to tie the wires with a
new cable tie.
Y) is
6
No.51788
Page 7
A
A
FRONT CABINET
r
CRT
SPEAKER
####
CRT SOCKET PWB
MAIN PWB
V-27D302
V-27D202
This exploded view describes about the
AV-27D302/R and /S.
Although the AV-27D202/R, /S is
slightly different from this figure, you
can use the exploded view fo
disassembling the AV-27D202/R, /S in
the same step as for this one.
HVT
SPEAKER
####
POWER PWB
REAR COVER
""""
(×4)
!!!!
(×11)
POWER CORD
Fig.1
No.51788
7
Page 8
A
V-27D302
A
V-27D202
MEMORY IC REPLACEMENT
1. Memory IC
This model uses a memory IC.
This memory IC stores data for proper operation of the video and deflection circuits.
When replacing, be sure to use an IC containing this (initial value) data.
2. Memory IC replacement procedure
Procedure Screen display
(1) Power off
Switch off the power and disconnect the power cord from the outlet.
(2) Replace the memory IC
Initial value must be entered into the new IC.
(3) Power on
Connect the power cord to the outlet and switch on the power.
(4) System constant check and setting
1) Press SLEE P TIMER key and, while the indication of “SLEEP TIMER 0
MIN.” is being displayed, press DISPLAY key and VIDEO STATUS key
on the remote control unit simultaneously.
2) The SERVICE MENU screen of Fig.1 is displayed.
3) While the SERVICE MENU is displayed, again simultaneously press
the DISPLAY and VIDEO STATUS keys to display the Fig.2 SYSTEM
CONSTANT screen.
4) Refer to the SYSTEM CONSTANT table and check t he setting items.
Where these differ, select the setting item with the UP/DOWN (▲/▼)
key and adjust the setting with the LEFT/RIGHT ( ) keys.
5) After adjusting, release the LEFT/RIGHT( ) key to store the set ting
value.
6) Press the EXIT key twice to return the normal screen.
(5) Receive channel setting
Refer to the OPERATING INSTRUCTIONS (USER'S GUIDE) and set
the receive channels (Channels Preset) as described.
(6) User settings
Check the user setting items according to Table 2.
Where these do not agree, refer to the OPERATING INSTRUCTIONS
(USER'S GUIDE) and set the items as described.
SERVICE MENU
PICTURE SOUND
THEATER
LOW LIGHT HIGH LIGHT
RF AFC CHK
SELECT BY EXIT BY
OPERATE BY EXIT
Fig.1
SYSTEM CONSTANT
**-
**-********
MODEL :
V-CHIP : YES
CAN V-CHIP : YES
***
***********
****-***
********
***********
******
******
SELECT BY EXIT BY
OPERATE BY EXIT
**-**-
****
********
Fig.2
(7) SERVICE MENU setting
Verify what to set in the SERVICE MENU, and set whatever is
necessary.(Fig.1) Refer to the SERVICE ADJUSTMENT for setting.
8
No.51788
Page 9
A
A
TABLE 1 (System Constant setting)
A
A
Setting item Setting content
AV-27D302
Setting value
/R, /S
AV-27D202
V-27D302
V-27D202
/R, /S
MODEL AV-27D302 AV-27D202
V-CHIP YES YES
CAN V-CHIP YES YES
V-27D302
AV-27230 AV-20D202
YES NO
YES NO
V-27D202
TABLE 2 (User setting value)
Setting item Setting value
1. Use remot e controller k eys
POWER
CHANNEL
CHANNEL PRESET
VOLUME
TV/VIDEO(INPUT)
DISPLAY
SLEEP TIMER
VIDEO STATUS
HYPER SURROUND
2. Setting of MENU
TINT
COLOR
PICTURE
BRIGHT
DETAIL
NOISE MUTING
SET VIDEO STATUS
BASS
TREBLE
BALANCE
MTS
TV SPEAKER
SET CLOCK
ON/OFF TIMER
LANGUAGE
CLOSED CAPTION
BACKGROUND
V2 COMPONENT IN
AUTO TUNER SETUP
CHANNEL SUMMARY
V-CHIP
V-CHIP RATINGS
SET LOCK CODE
UNRATED
ON
CH 02
See OPERATING INSTRUCTIONS.
10
TV
OFF
OFF
STANDARD
OFF
CENTER
CENTER
CENTER
CENTER
CENTER
ON
ALL CENTER
CENTER
CENTER
CENTER
STEREO
ON
Unnecessary to set
NO
ENGLISH
OFF
BLACK
NO
TUNER MODE : AIR
Unnecessary to set
OFF
ALL OFF
Unnecessary to set
VIEW
No.51788
9
Page 10
A
V-27D302
A
V-27D202
SERVICE ADJUSTMENTS
ADJUSTMENT PREPARATION
1. You can make the necessary adjustments for this unit with
either the Remote Control Unit or With the adjustment
tools and parts as given below.
2.
Adjustment with the Remote Control Unit is made on the
basis of the initial setting values, however, the new setting
values which set the screen to its optimum condition may
differ from the initial settings.
3. Make sure that AC power is turned on correctly.
4. Turn on t he power for set and test equipment before use, and
start the adjustment procedures after waiting at least 30
minutes.
5. Unless otherwise specified, prepare the most suitable reception
or input signal for adjustment.
6. Never touch any adjustment parts which are not specified in the
list for this adjustment - variable resistors, trans formers,
condensers, etc.
7. Presetting before adjustment.
Unless otherwise specified in the adjustment instructions,
preset the following functions with the remote control unit:
VIDEO STATUS STANDARD
BASS, TREBLE, BALANCE
HYPER SURROUND
TINT, COLOR,
PICTURE, BRIGHT, DETAIL
CENTER
OFF
CENTER
ADJUSTMENT EQUIPMENT
1. DC voltmeter (or digital voltm eter)
2. Oscilloscope
3. Signal generator (Pattern generator)［NTSC
4. Remote control unit
5. TV audio multiplex signal generator.
6. Frequency counter
］
ADJUSTMENT ITEMS
Adjustment items Adjustment items Adjustment items
B1 POWER SUPPLY WHITE BALANCE (High Light) MTS STEREO VCO
RF. AGC
FOCUS SUB CONTRAST MTS FILTER check
V. SIZE
H. POSITION SUB TINT
WHITE BALANCE (Low Light) MTS INPUT LEVEL check
SUB BRIGHT MTS SAP VCO
SUB COLOR MTS SEPARATION
10
No.51788
Page 11
A
A
ADJUSTMENT LOCATIONS
V-27D302
V-27D202
CRT SOCKET PWB
(W ithin MAIN PWB ASS'Y)
TP-R
T
TP-E
(SOLDER SIDE)
FRONT
MAIN PWB
POWER
E1
TOP
CRT EARTH
(BRAIDED ASS'Y)
VOL+ VOL- CH+ CH- MENU
FRONT
POWER PWB
A
P
PW
FUSE
POWER
A
RESISTER
FUSE
IC921
TP-91
(B1)
TP-E
( )
IC101
IC702IC701
T
TUNER
S
U
HV
HVT
AV IN / OU T
No.51788
UPPER : FOCUS
LOWER : SCREEN
11
Page 12
A
V-27D302
A
V-27D202
BASIC OPERATION OF SERVICE MENU
1. TOOL OF SERVICE MENU OP ERATION
Operate the SERVICE MENU with the REMOTE CONTROL UNIT.
2. SERVICE MENU ITEMS
In general, basic setting (adjustments) items or verifications are perf orm ed in the SERVICE MENU.
PICTURE
"
SOUND
"
THEATER
"
LOW LIGHT
"
HIGH LIGHT
"
RF AFC CHK
"
3. Basic Operations of the SERVICE MENU
(1) How to enter the SERVICE MENU.
Press SLEEP TIMER key and, while the indicat ion of “SLEEP TIMER 0 MIN.” is being displayed, press DISPLAY key and VIDEO
STATUS key on the remote control unit simultaneously to enter the SERVICE MENU screen ① shown in the next figure page.
(2) SERVICE MENU screen selection
Press the UP / DOWN(▲/▼) key to select any of the following items.
････････････････････
･････････････････････
･･･････････････････
･･････････････････
･････････････････
･････････････････
PICTURE
●
THEATER
●
LOW LIGHT
●
RF AFC CHK
●
This sets the setting values (adjustment values) of the VIDEO/CHROMA and DEFLECTION circuits.
This sets th e setting values (adjustment values) of the AUD IO circuit.
This is used when the THEATER MODE is adjusted.
This sets th e setting values (adjustment values) of the WHITE BALANCE cir cuit.
This sets th e setting values (adjustment values) of the WHITE BALANCE cir cuit.
This is used when the IF VCO is adjusted. [Do not adjust]
SOUND
●
HIGH LIGHT
●
(3) Enter the any setting ( adjustment ) mode
PICTURE and SOUND mode
"
1) If select any of PICTURE or SOUND items, and the LEFT / RIGHT( ) key is pressed from SERVICE MENU ( MAIN MEN U ) , the
screen ② will be displayed as shown in figure page later.
2) Then the UP / DOWN (▲/▼) key is pressed, the PICTURE mode screen ③ or the SOUND mode screen ④ i s displayed, and the
PICTURE or SOUND setting can be performed.
THEATER, LOW LIGHT, HIGH LIGHT and RF AFC CHK mode
"
1) If select any of THEATER / LOW LIGHT / HIGH LIGHT / RF AFC CHK items, and the LEFT / RIGHT( ) key is pressed from
SERVICE MENU ( MAIN MENU ), the screens ⑤ ⑥ ⑦ ⑧ will be displayed as shown in figure page later.
2) Then the settings or verifications can be performed.
12
No. 51788
Page 13
A
V-27D302
A
)
)
]
)
V-27D202
SERVICE MENU (MAIN MENU
①①①①
SERVICE MENU
PICTURE SOUND
THEATER
LOW LIGHT HIGH LIGHT
RF AFC CHK
SELECT BY EXIT BY
OPERATE BY
EXIT
SCREEN
②②②②
IT
SELECT BY
④④④④
1. IN LEVEL
STATUS
SELECT BY
OPERATE BY
⑤⑤⑤⑤
SOUND MODE
THEATER MODE(1/2
EXIT BY
EXIT
***
***
******
****
***********
***
********
******
EXIT BY
EXIT
IT
IT
SELECT BY
OPERATE BY
THEATER MODE(2/2
1. BRIGHT
STATUS
PICTURE M ODE
③③③③
***
***
******
****
***********
***
********
******
EXIT BY
EXIT
IT
RF AFC CHK MODE [DO NOT ADJUST
⑧⑧⑧⑧
TOO HIGH TOO LOWGOOD
RF AFC
FINE
STATUS
SELECT BY
OPERATE BY
****
***********
********
ON
***
***
******
***
******
EXIT BY
EXIT
TINT
COLOR
PICTURE
BRIGHT
DETAIL
R CUT
G CUT
SELECT BY
OPERATE BY
LOW LIGHT MODE
⑥⑥⑥⑥
BRIGHT
***
***
*** ***
BRIGHT
HIGH LIGHT MODE
⑦⑦⑦⑦
***
***
******
IT
B CUT
***
***
******
R DRIVE
***
***
******
B DRIVE
***
***
******
***
***
DC REST
******
***
***
BLK ST
******
***
***
GMM PNT
******
***
***
******
***
***
******
***
***
*** ***
HIGH LIGHT
***
***
******
EXIT BY
***
***
******
EXIT BY
***
***
******
***
***
******
***
***
******
***
***
******
***
***
******
***
***
******
EXIT BY
EXIT
EXIT
EXIT
****
CD MAT
RY GAIN
GY PHAS
CORING
1/2
IT
IT
IT
SELECT BY
OPERATE BY
CMP CD
****
CMP RY
****
CMP GY
****
CMP COR
****
****
****
****
EXIT BY
EXIT
2/2
IT
No. 51788
13
Page 14
A
V-27D302
A
V-27D202
(4) Setting method
1)
UP / DOWN (▲/▼
Select the SETTING ITEM.
)key.
2)
LEFT / RIGHT
Setting (adjust) the SETTING VALUE of the SETTING ITEM.
When the key is released the SETTING VALUE will be stored
(memorized).
( ) key.
3) EXIT key
Return to the previous screen.
(5) Releasing SERVICE MENU
1) After returning to the SERVICE MENU upon completion of the setting
(adjustment) work, press the EXIT key again.
SETTING
ITEM
1. BRIGHT
STATUS
SELECT BY
OPERATE BY
********
********
****************
PICTURE MODE
***
***
******
EXIT BY
EXIT
IT
SETTING VALUE
The settings for LOW LIGHT and HIGH LIGHT are described in the WHITE
★
BALANCE page of ADJUSTMENT.
The letter of the selected
Items are displayed in yellow.
TINT
COLOR
PICTURE
BRIGHT
DETAIL
R CUT
G CUT
SELECT BY
OPERATE BY
**
******
****
**
******
****
**
******
****
**
******
****
**
******
****
**
******
****
**
******
****
B CUT
R DRIVE
B DRIVE
DC REST
BLK ST
GMM PNT
THEATER MODE(1/2)
**
******
****
**
******
****
**
******
****
**
******
****
**
******
****
**
******
****
EXIT BY
EXIT
1. IN LEVEL
STATUS
SELECT BY
OPERATE BY
***
***
******
********
********
****************
EXIT BY
EXIT
IT
SOUND MODE
CD MAT
RY GAIN
GY PHAS
CORING
1/2
IT
SELECT BY
OPERATE BY
****
****
****
****
CMP CD
CMP RY
CMP GY
CMP COR
****
****
****
****
EXIT BY
EXIT
2/2
IT
THEATER MODE(2/2)
14
No. 51788
Page 15
A
V-27D302
A
V-27D202
INITIAL SETTING VALUE OF SERVICE MENU
1. Adjustment of the SERVICE MENU is made on the basis of the initial setting values; however, the new setting values which set the screen in
its optimum condition may differ from the initial setting.
2. Do not change the initial setting values of the setting (adjustm ent) items not listed in “ADJUSTMENT”.
PICTURE MODE
The 5 setting items in the video mode No.6 EXT BRI, No.7 EXT PICT, No.8 EXT CLR, No.9 EXT TINT and No.10 EXT DTL are linked to the
"
items in the TV MODE No.1 BRIGHT, No.2 PICTURE, No.3 COLOR, No.4 TINT and No.5 TV DTL respectively. When the setting items in
the TV mode are adjusted, the values in the setting items in t he video mode are revised automatically t o the same values in the TV mode.
(The initial setting values given in parenthesis are offset values.)
When the 5 items (No.6, 7, 8, 9 and 10) are adjusted in the video mode, the setting values in each item are changed independently.
"
No. Setting (Adjustment) items Variable range
1. BRIGHT 000～127 064 064
2. PICTURE 000～127 100 100
3. COLOR 000～127 055 055
4. TINT 000～127 087 087
5. TV DTL 000～63 050 050
6. EXT BRI.
7. EXT PICT.
8. EXT CLR
9. EXT TINT
10. EXT DTL 000～063 050 050
11. CMP BRI
12. CMP PICT
13. CMP CLR 000～127 072 072
14. CMP TINT 000～127 037 037
15. CMP DTL 000～063 050 050
16. CMP R CT
17. CMP G CT
18. CMP B CT
19. CMP R DR
20. CMP B DR
21. WPL 000 / 001 001 001
22. C TRAP 000 / 001 000 000
23. CORING 000 / 001 001 001
24. CMP CORI 000 / 001 001 001
25. TV SHAP 000 / 001 001 001
26. EXT SHAP 000 / 001 001 001
27. CMP SHAP 000 / 001 001 001
28. RGB CONT
29. TV ID S 000 / 001 000 000
30. EXT ID S 000 / 001 000 000
025
±
025 +002 +002
±
025
±
025 -005 -005
±
025 -001 -001
±
025
±
025 +008 +008
±
025
±
025 +008 +008
±
025
±
025 -002 -002
±
000～063
AV-27D302 /S
AV-27D202 /S
Initial setting value
AV-27D302 /R
AV-27D202 /R
000
±
000
±
000
±
000
±
000
±
016 016
±
±
±
±
±
000
000
000
000
000
No. 51788
15
Page 16
A
V-27D302
A
V-27D202
No. Setting (Adjustment) items Variable range
31. F ID 000 / 001 000 000
32. Y MUTE 000 / 001 000 000
33. SUB CONT 000～015 008 008
34. R Y GAIN 000 / 001 001 001
35. CMP R Y 000 / 001 001 001
36. G Y PHAS 000 / 001 001 001
37. CMP G Y 000 / 001 001 001
38. CD MATRI
39. CMP CD M
40. BLK ST
41. DC REST
42. CLR GMM 000 / 001 000 000
43. UV / CBCR 000 / 001 000 000
44. AT FLESH 000 / 001 000 000
45. ABL GAIN
46. ABL ST P
47. RGB ABCL 000 / 001 001 001
48. TV B/T 000 / 001 001 001
49. EXT B/T 000 / 001 000 000
50. GMM PNT
51. BUZZ 000 / 001 000 000
52. RF AGC 000～063 045 045
53. AFT SENS 000 / 001 001 001
54. R/G DRV 000 / 001 001 001
55. BLK SW 000 / 001 000 000
56. V S COR 000～015 011 011
57. V LIN 000～015 012 012
58. V SIZE 000～127 037 037
59. V AGC 000 / 001 000 000
60. TV AFC 000～003 001 001
61. EXT AFC 000～003 002 002
62. V POSI 000～007 000 000
63. H POSI 000～031 015 015
64. TV V FR 000～003 000 000
65. EXT V FR 000～003 003 003
66. STND BY 000 / 001 000 000
67. V RMP RE 000 / 001 001 001
68. V 48HZ 000 / 001 000 000
69. V EHT 000～007 000 000
70. H EHT 000～007 000 000
000～003
000～003
000～003
000～003
000～003
000～003
000～003
AV-27D302 /S
AV-27D202 /S
Initial setting value
AV-27D302 /R
AV-27D202 /R
003 003
001 001
001 001
001 001
000 000
003 003
003 003
16
No. 51788
Page 17
A
V-27D302
A
V-27D202
No. Setting (Adjustment) items Variable range
71. V BLK L
72. V BLK U 000～003 001 001
73. CCD IN 000 / 001 000 000
74. H BLK 000 / 001 000 000
75. OVER MD 000 / 001 001 001
76. APACON L 000 / 001 001 001
77. RF S/N T 000 / 001 000 000
78. EX S/N T 000 / 001 000 000
79. R S/N V1 000～063 000 000
80. R S/N V2 000～063 000 000
81. R S/N V3 000～063 000 000
82. R S/N V4 000～063 000 000
83. E S/N V1 000～063 000 000
84. E S/N V2 000～063 000 000
85. E S/N V3 000～063 000 000
86. E S/N V4
87. COR LEV
88. VNR CHK
89. VC SN TM
90. VC SN SP
91. CH MUTE 000 / 001 000 000
92. OSD HP 000～031 018 018
93. OSD VP 000～031 008 008
94. FM TRAP 000 / 001 000 000
95. OSC SEL 000 / 001 001 001
96. SD SEL 000 / 001 001 001
97. VF LK EX 000 / 001 000 000
98. F LOCK 000～002 002 002
99. AFC HIGH 000～064 031 031
000～003
000～063
000～003
000～255
000～255
000～255
AV-27D302 /S
AV-27D202 /S
Initial setting value
AV-27D302 /R
AV-27D202 /R
000 000
000 000
000 000
000 000
000 000
000 000
SOUND MODE
Initial setting value
No. Setting (Adjustment) item Variable range
1. IN LEVEL
2. FH MON 000 / 001 000 000
3. ST VCO
4. PILOT 000 / 001 000 000
5. FILTER
6. LOW SEP
7. HI SEP
8. 5FH MON 000 / 001 000 000
9. SAP VCO
10. BBE BASS
11. BBE TRE
000～063
000～063
000～063
000～063
000～063
000～063
010
±
010
±
No. 51788
AV-27D302 /S
AV-27D202 /S
024 024
032 032
027 027
014 014
021 021
034 034
-001 -001
-001 -001
AV-27D302 /R
AV-27D202 /R
17
Page 18
A
V-27D302
A
V-27D202
THEATER MODE
Initial setting value
Setting (Adjustment) item Variable range
TINT
COLOR
PICTURE
BRIGHT -20～+20
DETAIL -20～+20 +03 +03
R CUT
G CUT
B CUT
R DRIVE
B DRIVE -99～+99 -18 -18
DC REST 0～3+01 +01
BLK ST
GMM PNT
CD MAT
RY GAIN
GY PHAS 0～1
CORING 0～1+01 +01
CMP CD
CMP RY
CMP GY
CMP COR
-20～+20
-20～+20
-20～+20
-20～+20
-20～+20
-20～+20
-99～+99
0～3
0～3
0～3
0～1
0～3
0～1
0～1
0～1
AV-27D302 /S
AV-27D202 /S
-06 -06
-05 -05
-08 -08
00
±
00
±
00
±
00
±
+06 +06
00
±
+01 +01
+01 +01
+01 +01
00
±
+01 +01
+01 +01
00
±
+01 +01
AV-27D302 /R
AV-27D202 /R
00
±
00
±
00
±
00
±
00
±
00
±
00
±
LOW LIGHT MODE
Setting (Adjustment) item Variable range Initial setting value
R CUTOFF
G CUTOFF
B CUTOFF
HIGH LIGHT MODE
Setting (Adjustment) item Variable range Initial setting value
G DRIVE
B DRIVE
RF AFC CHECK MODE
Setting (Adjustment) item Variable range Initial setting value
RF AFC
FINE
0～255
0～255
0～255
0 ～ 255
0 ～ 255
ON / OFF
FIXED
ON
FIXED
85
85
85
60
60
DO NOT
ADJUST
18
No. 51788
Page 19
A
A
■
■ADJUSTMENTS
■■
B1 POWER SUPPLY
V-27D302
V-27D202
Item
Check of
B1 POWER
SUPPLY
Measuring
instrument
DC Voltmeter TP-91 (B1)
Test point Adjustment part Description
TP-E(
""""
)
1. Receive a black-and-white signal.
2. Connect the DC Voltmeter to TP-91 (B1) and TP-E(
3. Confirm that the voltage is DC134V .
ADJUSTMENT OF VIDEO / CHROMA, DEFLECTION CIRCUIT
Item
RF. AGC
adjustment
Measuring
instrument
Test point Adjustment part Description
No.52 RF AGC
1. Receive a broadcast.
2. S e l ect “No.52 RF AGC” of the PICTURE MODE.
3. Press the MUTING key and turn off the color.
4. With the MENU LEFT key, get noise in the screen picture. (0
5. Press the MENU RIGHT key and stop when noise disappears
6. Change to other channels and make sure that there is no
7. Press the MUTING key and get color out.
side of setting value)
from the screen.
irregularity.
+2V
-2.5V
""""
).
FOCUS
adjustment
Signal
generator
FOCUS VR
[In HVT]
No. 51788
1. Receive a crosshatch signal.
2. While looking at the screen, adjust FOCUS VR so that the
vertical and horizontal lines will be clear and in fine detail.
3. Make sure that the picture is in focus even when the screen gets
darkened.
19
Page 20
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V-27D302
A
V-27D202
Item
V.SIZE
Adjustment
Screen
size
Measuring
instruments
Signal
generator
Test point Adjustment part Description
No.58 V.SIZE
Screen size
Picture
size
100%
Picture size
1. Receive a crosshatch signal.
2. Select No.58 V.SIZE in the PICTURE MODE.
3. Set the initial setting value of No.58 V.SIZE with the LEFT /
RIGHT key of the MENU.
4. Adj ust No.58 V.SIZE until the vertical screen size becomes the
value as shown table below.
Application model Vertical screen size
AV-27D302 /R
AV-27D202 /R
AV-27D302 /S
AV-27D202 /S
92.0%
89.0%
H.POSITION
Adjustment
Signal
generator
No.63 H.POSI
1. Receive a crosshatch signal.
2. Select the No.63 H.POSI of the PICTURE MODE.
3. Set the initial setting value of the No.63 H.POSI with the LEFT /
RIGHT key of the MENU.
4. Adjust the No.63 H.POSI until the screen will be horizontally
centered.
20
No. 51788
Page 21
A
V-27D302
A
V-27D202
Item
WHITE
BALANCE
(Low Light)
Adjustment
R CUTOFF
BRIGHT
Measuring
instruments
Signal
generator
G CUTOFF
[LOW LIGHT] MODE
BRIGHT
B CUTOFF
BRIGHT
H.LINE ON EXITH.LINE OFF
R CUTOFF B CUTOFFG CUTOFF
R CUTOFF B CUTOFFG CUTOFF
***
***
******
***
***
******
REMOTE CONTROL UNIT
1 2 3
***
***
******
***
***
******
54
EXIT BY
Test point Adjustment part Description
BRIGHT
1. Recei ve a bl ack -and-white signal.(Color off)
2. Select the LOW LIGHT MODE from the SERVICE MENU.
R. CUTOFF
G. CUTOFF
B. CUTOFF
3. Set the initial s etting value of B RIGHT with the LEFT / RIGHT
key of the remote control unit.
4. Set the initial setting value of R CUTOFF, G CUTOFF and B
CUTOFF with the ④or⑦key(R), ⑤or⑧key(G), ⑥or⑨key(B)
SCREEN VR
[In HVT]
of the remote control unit.
5. Di splay a single horizontal line by pressi ng the ①key of the
remote control unit.
6. Turn the screen V R all the way to the left.
7. Turn the screen VR gradually to the right from the left until
either one of the red, blue or green colors appears faintly.
8. Adjust the two colors which did not appear until the single
horizontal line that is displayed becomes white using the
EXIT
IT
to ⑨ keys of the remote control unit.
9. Turn the screen VR to where the single horizontal line glows
faintly.
10. Press the ② key to return to the regular screen.
The ③ EXIT key is the cancel key for the WHITE
＊
BALANCE.
6
987
④
WHITE
BALANCE
(High Light)
Adjustment
Signal
generator
[HIGH LIGHT] MODE
G DRIVE
HIGH LIGHT
B DRIVE
************************
EXIT BY
EXIT
G. DRIVE
B. DRIVE
IT
No. 51788
1. Recei ve a m onoscope patt ern si gnal .
2. Select the【HIGH LIGHT】MODE in the SERVICE MENU.
3. Set the initial setting value of G DRIVE and B DRIVE with the
and ⑥, ⑨ keys of the remote control unit.
④, ⑦
4. Adjust the screen until it becomes white us ing the ④, ⑦,
and ⑨ keys of the remote control unit.
The ③ EXIT key is the cancel k ey for the W HITE BALANCE
＊
mode.
Remote Control Unit Key Operation
key : H.LINE ON
①
key : H.LINE OFF
②
key : EXIT
③
key : G DRIVE
④
key : G DRIVE
⑦
key : B DRIVE
⑥
key : B DRIVE
⑨
▲
▼
▲
▼
⑥
21
Page 22
A
V-27D302
A
V-27D202
Item
SUB
BRIGHT
Adjustment
SUB
CONTRAST
Adjustment
SUB COLOR
adjustment
Measuring
instruments
Signal
generator
Oscilloscope
Remote
control unit
Test point Adjustment part Description
TP-R
TP-E(####)
[CRT
SOCKET
PWB]
No.1 BRIGHT
No.2 PICTURE
No.3 COLOR
1. Receive a broadcast.
2. Select No.1 BRIGHT of the PICTURE MODE.
3. Set the initial setting value of the No.1 BRIGHT with the LEFT
/ RIGHT key of the MENU.
4. If the brightness is not best with the initial setting value, make
fine adjustment of the No.1 BRIGHT until you get the optimum
brightness.
1. Receive a broadcast.
2. Select No.2 PICTURE of the PICT URE MODE.
3. Set the initial setting value of the No.2 PICTURE with the
LEFT / RIGHT key of the MENU.
4. If the contrast is not best with the initial setting value, make
fine adjustment of the No.2 PICTURE until you get the
optimum contrast.
[ Method of adjustment without measuring instrument ]
1. Receive a broadcast.
2. Select “No.3 COLOR” of the PICTURE MODE.
3. Set the initial setting value of the “No.3 COLOR” with the
LEFT/RIGHT key of the MENU.
4. If the color is not the best with the Initial setting value, make fine
adjustment of the “No.3 COLOR” until you get the optimum
color.
22
WWWW
[ Method of adjustment using measuring instrument ]
1. Input the full field color bar signal (75% white).
2. Select “No.3 COLOR” to the PICTURE MODE.
3. Set the initial setting value of the “No.3. COLOR” with the
LEFT/RIGHT key of the MENU.
4. Connect the oscilloscope between TP-R and TP-E.
Cy
5. Adjust COLOR and bring the value of
voltage
G
B
+20V
(V
W-R
).
in the illustration to the
(A)
(-)
0V
Y
Mg
(A)
(+)
RRRR
No. 51788
Application Model COLOUR adjustment voltage
AV-27D302 /R, /S
AV-27D202 /R, /S
+20V
+20V
Page 23
A
V-27D302
A
V-27D202
Item
SUB TINT
adjustment
Measuring
instruments
Signal
generator
Oscilloscope
Remote
control unit
Test point Adjustment part Description
TP-R
TP-E(####)
[CRT
SOCKET
PWB]
No.4 TINT
[ Method of adjustment without measuring instrument ]
1. Receive a broadcast.
2. Select “No.4 TINT” of the PICTURE MODE.
3. Set the initial setting value of the “No.4 TINT” with the
LEFT/RIGHT key of the MENU.
4. If the tint is not the best with the initial setting value, make fine
adjustment of the “No.4 TINT” until you get the optimum tint.
[ Method of adjustment using measuring instrument ]
1. Input the full field color bar signal (75% white).
2. Select “No.4 TINT” to the PICTURE MODE.
3. Set the initial setting value of the “No.4 TINT” with the
LEFT/RIGHT key to the MENU.
4. Connect the oscilloscope between TP-R and TP-E.
5. Adjust TINT and bring t he value of
voltage
+17V
(V
W-Y
).
in the illustration to the
(B)
(-)
0V
(+)
(B)
WWWW
YYYY
Cy
G
B
Mg
R
Application Model COLOUR adjustment voltage
AV-27D302 /R, /S
AV-27D202 /R, /S
+17V
+17V
No. 51788
23
Page 24
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V-27D302
A
V-27D202
ADJUSTMENT OF MTS CIRCUIT
Item
MTS INPUT
LEVEL
check
Measuring
instrument
Test point Adjustment part Description
No.1 IN LEVEL
1. Select the “No.1 IN LEVEL” of th e SOUND MODE.
2. Verify that the “No.1 IN LEVEL” is set at its ini tial sett i ng val ue.
MTS STEREO
VCO
adjustment
MTS SAP
VCO
adjustment
Signal
generator
Frequency
counter
Signal
generator
Frequency
counter
R OUT
[AUDIO OUT]
【【【【
】】】】
MPX
Connector
【【【【4】】】】
pin SDA
【【【【3】】】】
pin GND
R OUT
[AUDIO OUT]
No.2 FH MON.
No.3 ST VCO
No.8 5FH MON.
No.9 SAP VCO
1. Receive a RF signal (nonmodulated sound signal) from the
antenna terminal.
2. Select the “No.2 FH MON.” of SOUND MODE, and change the
setting value from 0 to 1.
3. Connect the Frequency Counter to R OUT RCA pin of the
AUDIO OUT.
4. Select the “No.3 ST VCO”.
5. Set the initial setting value of the “No.3 ST VCO” with the
LEFT/RIGHT key of the menu.
6. Adjust the “No.3 ST VCO” so that the Frequency Counter will
display 15.73kHz±0.1kHz.
7. Select the “No.2 FH MON.” of the SOUND MODE, and reset
the setting value from 1 to 0.
1. Recei ve a RF signal (non modulated sound signal) from the
antenna terminal.
2. Connect between pin【4】of【MPX】connector and GND (Pin
【3】of【
3. Select the “No.8 5FH MON.” of the SOUND MODE, and reset
the setting value from 0 to 1.
4. Connect the Frequency Counter to R OUT RCA pin of the
AUDIO OUT.
5. Select the “No.9 SAP VCO”.
6. Set the initial setting value of “No.9 SAP VCO” with the
LEFT/RIGHT key of the menu.
7. Adjust the “No.9 SAP VCO” so that the Frequency Counter will
display 78.67kHz±0.5kHz.
8. Select the “No.8 5FH MON.” of the SOUND MODE, and reset
the setting value from 1 to 0.
MPX】connector) through 1MΩ Resistor.
24
No. 51788
Page 25
A
V-27D302
A
V-27D202
Item
MTS FILTER
check
MTS
SEPARATION
adjustment
L-Channel
signal waveform
Measuring
instrument
TV audio
multiplex
signal
generator
Oscilloscope
Test point Adjustment part Description
L OUT
R OUT
[AUDIO OUT]
R-Channel
crosstalk portion
Minimum
No.5 FILTER
No.6 LOW SEP.
No.7 HI SEP.
1. Select the “No. 5 FILTER” of the SOUND MODE.
2. Verify that the “No.5 FILTER” is set at its initial setting value.
1. Input a stereo L signal (300Hz) from the TV audio multiplex
signal generator to the antenna terminal.
2. Connect an oscilloscope to L OUT RCA pin of the AUDIO OUT,
and display one cycle portion of the 300Hz signal.
3. Change the connection of the oscilloscope to R OUT RCA pin of
the AUDIO OUT, and enlarge the voltage axis.
4. Select the “No.6 LOW SEP.” of the SOUND MODE.
5. Set the initial setting value of the “No.6 LOW SEP.” with the
LEFT/RIGHT key of the menu.
6. Adjust the “No.6 LOW SEP.” so that the strok e element of the
300Hz signal will become minimum.
7. Change the signal to 3kHz, and similarly adjust the “No.7 HI
SEP.”.
1 cycle
No. 51788
25
Page 26
A
V-27D302
A
V-27D202
HOW TO CHECK THE HIGH VOLTAGE HOLD DOWN CIRCUIT
1. HIGH VOLTAGE HOLD DOWN CIRCUIT
After repairing the high voltage hold down circuit shown in Fig. 1.
This circuit shall be checked to operate correctly.
2. CHECKING OF THE HIGH VOLTAGE HOLD DOWN CIRCUIT
(1) Turn the power switch to on.
(2) As shown in Fig. 1, set the resistor between X
(3) Make sure that the screen picture disappears.
(4) Temporarily unplug the power plug.
(5) Remove the resistor replaced X
(6) Again plug the power plug, make sure that the normal picture is displayed on the screen.
R957
D957
POWER
ON OFF
connector 1 and 3 .
T921
Q953
Q562
connector 1 and 3 .
RESISTOR
18.84kΩ
±1%1/4W
ΩΩΩ±±±
3 2 1
CONNECTOR
X
HEATER
T522
D563
Q561
R564
C562
D562
R563
Fig. 1
R562
C561
D561
R561
4
D565
BW
26
No. 51788
Page 27
A
V-27D302
A
V-27D202
SELF CHECK FUNCTIONS
1. Outline
This model has self check functions given below. When a malfunction has been detected, t he POWER is turned off and the LED flashes to
inform of the failure . The malfunction is detected by the signal input state of the control line connected to the microcomputer.
2. Self check items
Check item Details of detection Method of detection State of malfunction
CRT NECK protector
Also detected if the
power supply line output
from the HVT (High
voltage Transformer) has
shorted with the ground.
3. Self check indicating function
The self-check function begins detection about 5 seconds after
power is supplied.
In the event a malfunction is detected, the power is cut off
immediately.
At this time, the ON-TIMER LED flashes to inform of the
malfunction.
[ON-TIMER LED indication]
The ON-TIMER LED flashes at 0.5 seconds intervals.
When the vertical circuit Scorrection capacitor C427
is shorted, detect the
potential drop of the C427,
and prevent the burn
damage to the CRT NECK.
(Grounding of shorting of
the power supply output
from t he H VT to t h e v er t i cal
circuit, and the small signal
power supply is also
detected.)
The microcomputer detects at 1
second intervals.
If NG is detected for more than 1
ms, a malfunction is interpreted.
POWER
Supplied
After about
5 seconds
Start of
detection
When a malfunction has been
detected, the POWER is turned
off. While the POWER is being
turned off , the power key of the
remote controller is not operational
until the power code is taken out
and put in again.
Malfunction
is detected
POWER OFF
Flashing
ON-TIMER LED
No. 51788
27
Page 28
A
V-27D302
A
V-27D202
SPECIFIC SERVICE INSTRUCTIONS
REPLACEMENT OF CHIP COMPONENT
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.
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.
REPLACEMENT STEPS
!
How to remove Chip parts
1.
#
Resistors, capacitors, etc.
(1) As shown in the figure, push the part with tweezers and
alternately melt the solder at each end.
2. How to install Chip parts
#
Resistors, capacitors, etc.
(1) Apply solder to the pattern as indicated in the figure.
(2) Shift with tweezers and remove the chip part.
#
Transistors, diodes, variable resistors, etc.
(1) Apply extra solder to each lead.
SOLDER
(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.
SOLDER
(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.
A
(3) First solder lead
(4) Then solder leads
as indicated in the figure.
A
B
C
B
and C.
A
B
Note : After removing the part, remove remaining solder from
the pattern.
28
No. 51788
C
Page 29
JVC SERVICE & ENGINEERING COMPANY OF AMERICA
DIVISION OF JVC AMERICAS CORP.
Head office
East Coast
Midwest
West Coast
Southwest
Hawaii
Southeast
: 1700 Valley Road, Wayne, New Jersey 07470 (973)315-5000
: 10 New Maple Avenue, Pine Brook, New Jersey 07058 (973)396-1000
: 705 Enterprise St. Aurora, Illinois 605 04 (630)851-7855
: 5665 Corporate Avenue, Cypress, California 90630 (714)229-8011
: 10700 Hammerly, Suite 105, Houston,Texas 77043 (713)935-9331
: 2969 Mapunapuna Place, Honolulu, Hawaii 96819 (808)833-5828
: 1500 Lakes Parkway, Lawrenceville, Georgia 30243 (770)339-2582
JVC CANADA INC.
Head office
Vancouver
&
: 21 Finchdene Square Scarborough, Ontario M1X 1A7 (416)293-1311
: 13040 Worster Court Richmond B.C. V6V 2B3 (604)270-1311
4
27D302S-UCM #4 27D302R-UCM #999
27D202S-UCM #4 27D202R-UCM #999
Printed in Japan
VP 0103
DP3051
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