Page 1
JVC AV-25TS1 EK
1
Matrix
Item See Model Book
AV Selector PCB............................................................................. AV-21SX1EK 5
Front Control PCB.......................................................................... AV-21SX1EK 5
CRT PCB.......................................................................................... AV-21SX1EK 5
Specifications
Item Content
Dimensions (W x H x D) .......................................................... 66.3cm x 51.7cm x 47.2cm
Mass ............................................................................................................................ 27.2kg
TV RF System .......................................................................................................... CCIR (I)
Colour System ...................................................................PAL/NTSC (only in EXT mode)
Stereo System............................................................................................................NICAM
Teletext system ........... FASTEXT (United Kingdom system) / WST (Standard System)
Receiving Frequency ....................................................................... UHF 470MHz 862MHz
Intermediate Frequency
VIF Carrier ............................................................................................................... 39.5MHz
SIF Carrier ............................................................................................... 33.5MHz (6.0Mhz)
Colour Sub Carrier Frequency
PAL............................................................................................................................4.43Mhz
NTSC ...................................................................................................... 3.58MHz / 4.43MHz
Aerial Input Terminal................................................................. 75Ω Unbalanced, Coaxial
Power Input ........................................................................................ 220 - 240V AC , 50Hz
Power Consumption ................................................................... 133W (Max.) / 93W(Avg.)
Picture Tube....................................25”( Visible size: 59cm), Diagonally measured 1kV
High Voltage................................................................ 28.0kV
Speaker.................................................................................... 5 x 12cm Oval Type, 8Ω x 2
+ 1kV
(at zero beam current)
1.5kV
Audio Output...........................................................................................................5W + 5W
EXT-1/ EXT-2........................................................ 21-pin Euroconnector (SCART socket)
EXT-3 (Input)
Video ........................................................................................... 1Vp.p 75Ω (RCA pin jack)
Audio(L/R) ..................................... 500mVrms (-4dBs), High Impedance (RCA pin jack)
Remote Control Unit ............................................... RM-C760 [Battery size AM (R03) X2]
Replacement of Memory IC’s
1. Memory IC
This TV use a non-volatile memory IC (EEPROM IC). In the memory IC are memorized data for
correctly operating the video and deflection circuits. When replacing it, be sure to use a memory
IC containing the initial values (not blank one).
2. Procedure for replacing memory IC’s
Procedures
1) Power off
Switch the power off and unplug the power code from the outlet
2) Replacing the memory IC.
Replace with the new memory IC containing the initial values.
3) Power on
Plug the power code into the outlet and switch the power on.
4) Check and set SYSTEM CONSTANT SET:
a) Press the DISPLAY key and the CINEMA/GAME key of the REMOTE CONTROL UNIT simultane-
ously.
b) The SERVICE MENU screen shown in Fig. 1 will be displayed.
c) While the SERVICE MENU on display, press the DISPLAY key and CINEMA/GAME key simulta-
neously, and the SYSTEM CONSTANT SET screen shown in Fig. 2 will be displayed.
d) Check the setting values of the SYSTEM CONSTANT SET shown in Table 1.
If the value is different, select the setting item with the FUNCTION UP/DOWN key, and set the
correct value with the FUNCTION -/+ key.
e) Press the VIDEO/SOUND key and memorize the setting value.
f) Press the DISPLAY key twice, and return to the normal screen.
5) Setting of receive channels
Set the receive channels. For setting, refer to the OPERATING INSTRUCTIONS.
6) User Setting
Check the user setting values of Table 2, and if setting value is different, set the correct value.
For setting, refer to the OPERATING INSTRUCTIONS.
7) Setting of SERVICE MENU
Verify the seting items of the SERVICE MENU of Table 3, and reset where necessary.
SERVICE MENU
SERVICE MENU
1. IF 2.V/C
3.AUDIO 4.DEF
5.VSM PRESET
1.5: SELECT : EXIT
Fig. 1
SYSTEM CONSTANT SET NAMES OF REMOTE CONTROL KEY
SYSTEM CONSTANT SET
MODEL BB/JC (V
1. COUNTRY : UK
*.****
)
2. INCH : 25/28
- + : STORE :EXIT
JVC BB BASIC V00
M37221 M8.B00SP
Fig. 2
SETTING VALUES OF SYSTEM CONSTANT SET
Setting item Setting contents Setting value
1. COUNTRY >UK >OTHERS UK
2. INCH > 25 / 28 >21 21 (21”), 25/28 (25”)
Table 1
USER SETTING VALUES
Setting item Setting value Setting item Setting value
SUB POWER ON CINEMA/GAME USER
CHANNEL 1 POSITION SLEEP TIMER 0
CHANNEL PRESET See;OPERATING SPATIAL EFFECT OFF
INSTRUCTIONS OFF
VOLUME Appropriate sound volume 16:9/4:3 4:3
TV/EXT TV ECO OFF
DISPLAY POSITION DISPLAY BALANCE CENTER
P / N TV: PAL LANGUAGE ENGLISH
Table 2
SERVICE MENU SETTING ITEMS
Service menu Setting item
1. IF 1. VCO
2. DELAY POINT
2. V/C 1. CUTOFF
2. R DRIVE
3. G DRIVE
4. B DRIVE (Do not adjust)
5. BRIGHT
6. CONT.
7. COLOUR (PAL / N3 / N4)
8. TINT (NTSC)
9. SHARP (TV / VIDEO)
3. AUDIO 1. CONC LIMIT (Do not adjust)
2. A2 ID THR (Do not adjust)
4. DEF. 1.V-SLOPE
2.V-SHIFT
3.V-SIZE
4.H-CENT
5.H-SIZE
6.EW-PIN
7.TRAPEZ
8.V-S.CR (Fixed)
9.EW-COR (Fixed)
Service menu Setting item
5. VSM PRESET 1.BRIGHT
2.CONT.
3.COLOUR
4.SHARP
5.TINT
6.R DRIVE
7.G DRIVE
8.B DRIVE
9.BASS
10.TREBLE
Table 3
Service Adjustment
BEFORE STARTING SERVICE ADJUSTMENT
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 setting (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. Turn on the power of the TV and measuring instrument for warming up for at least 30 minutes before
starting adjustment.
4. Make sure that connection is correctly made to AC power source.
5. If the receive or input signal is not specified, use the most appropriate signal for adjustment.
6. Never touch parts (such as variable resistors, transformers and condensers) not shown in the
adjustment items of this service adjustments.
7. Preparation for adjustment (presetting): Unless otherwise specified in the adjustment items, preset the
following functions with the REMOTE CONTROL UNIT:
(1) SPATIAL EFFECT OFF
(2) BASS CENTRE
TREBLE CENTRE
BALANCE CENTRE
(3) CINEMA / GAME STANDARD
(4) ECO OFF
(5) 16:9 (ASPECT SIZE) 4:3
Recommended Safety Parts
Item Part No. Description
1 A59ECF20X05 PICTURE TUBE (ITC) (Inc.DY ,Wed) V01
2 CELD019-002J7 DEGAUSSING COIL L01
3 CM12771-B01-E REAR COVER
5 AEEMP003-185 POWER CORD
14 CETH011-00AJ1 H.V.TRANSF. T1551
15 CM22875-006-E RATING LABEL
17 CE41950-001J1 ANODE CABLE ASSY
R1585 QRV141F-2491AY MF R 2.49k Ω 1/4W
R1586 QRV141F-1582AY MF R 15.8k Ω 1/4W
R1991 QRZ0057-825 C R 8.2M Ω 1W
C1522 QFZ0117-8001L MPP CAP. 8000p F1.4kVH± 2.5%
C1524 QFZ0119-514S MPP CAP. 0.51 µ F 200V ±3%
C1905 QCZ9034-472A C CAP. 4700 p FAC400V
C1906 QCZ9034-472A C CAP. 4700 p FAC400V
C1907 QCZ9034-472A C CAP. 4700 p FAC400V
C1992 QCZ9041-471A C CAP. 470 p FAC400V
C1993 QCZ9041-332A C CAP. 3300 p FAC400V
T1551 CETH011-00AJ1 H.V.T.
T1901 CETS058-001J4 SW TRANSF.
D1901 D3SBA60 DIODE BRIDGE
Q1521 BU2508AX POWER TRANSISTOR H.OUT
IC1902 TLP621(D4)-LF2 I.C. (PH.COUPLER)
CP1951 ICP-N50-Y I.C. PROTECT
CP1952 ICP-N50-Y I.C. PROTECT
FR1406 QRD121J-lR5SY C R 1.5 Ω 1/2W
FR1552 QRH027K-R82M F R 0.82 Ω 2W
FR1553 QRH127J-5R6M F R 5.6 Ω 1/2W
FR1554 QRZ0054-4R7M F R 4.7 Ω 1/4W
FR1555 QRH017J-2R2M F R 2.2 Ω 1W
FR1556 QRH027J-3R3M F R 3.3 Ω 2W
FR1958 QRH027J-1R8M F R 1.8 Ω 2W
SK3001 CE42535-001J1 C.R.T.SOCKET
C8901 QFZ9040-474N MF CAP. 0.47 µ FAC275V
C8904 QFZ9040-473N MM CAP. 0.047 µ AC275V
F8901 QMF51D2-3R15J1 FUSE
LF8901 CE42144-001J2 LINE FILTER
S8901 QSP4K21-C01 PUSH SWITCH MAIN POWER
TH8901 CEKP011-001J2 TH POSISTOR
R0403 QRZ0054-470M F R 47 Ω 1/4W
R0504 QRZ0054-330M F R 33 Ω 1/4W
R0509 QRZ0054-470M F R 47 Ω 1/4W
Specifications / Replacement of memory IC’s / Service Adjustments / Adjustments Cont’d (1) / Adjustments Cont’d (2) / Adjustments Cont’d (3)
Safety Parts / Sub Menu Screens / Main PCB 1 / Main PCB 2
Page 2
JVC AV-25TS1 EK
2
Service Adjustments Cont’d
ADJUSTMENT ITEMS
Adjustment item Adjustment item
B1 VOLTAGE check VSM PRESET setting
VIDEO/CHROMA circuit adjustment
FOCUS adjustment DEFLECTION circuit adjustment
IF circuit adjustment AUDIO circuit (Do not adjust.)
MEASURING INSTRUMENT AND FIXTURES
1. DC voltmeter (or digital voltmeter)
2. Oscilloscope
3. Signal generator (Pattern generator) [PAL / NTSC]
4. Remote control unit
ADJUSTMENT LOCATIONS
BASIC OPERATION OF SERVICE MENU
1. TOOL OF SERVICE MENU OPERATION
Operate the SERVICE MENU with the REMOTE CONTROL UNIT.
2. SERVICE MENU ITEMS
With the SERVICE MENU, various settings (adjustment) can be made, and they are broadly
classified in the following items of settings (adjustments):
1) 1. IF For entering/adjusting the setting values (adjustment values) of the IF circuit.
2) 2. V/C For entering/adjusting the setting values (adjustment values) of the VIDEO/CHROMA
circuit
3) 3. AUDIO For entering/adjusting the setting values (adjustment values) of the multiplicity SOUND
circuit
4) 4. DEF For entering/adjusting the setting values (adjustment values) of the DEFLECTION circuit
5) 5. VSM PRESET . For setting the values of STANDARD, USER, CINEMA and GAME. (VSM
video status memory)
2) Selection of SUB MENU SCREEN
1) Press one of the keys 1~5 of the REMOTE CONTROL UNIT, and select the SUB MENU
SCREEN (See Fig. 2) from the SERVICE MENU.
SERVICE MENU -> SUB MENU 1. IF
2. V / C
3. AUDIO
4. DEF.
5. VSM PRESET
SUB MENU SCREEN
original 1 CUTOFF screen.)
4) VIDEO/SOUND Key. Memorize the setting value. (Before storing the setting values in memory, do
not press the CH, TV / EXT, DISPLAY, POWER ON / OFF keys - if you do, the values will not be
stored in memory.)
5) DISPLAY Key. Retum to the SERVICE MENU screen.
4)Release of SERVICE MENU
1)After completings the setting, retum to the SERVICE MENU, then again press the DISPLAY key.
B1 VOLTAGE CHECK
Item Measuring Test point Adjustment part Description
Check of B1 Signal TP-91(B1) 1. Receive a whole black signal.
Voltage generator TP-E 2. Connect a DC voltmeter to TP-91 and TP.E .
FOCUS ADJUSTMENT
Item Measuring Test point Adjustment part Description
Adjustment Signal FOCUS VR 1. Receive a cross-hatch signal.
of FOCUS generator [In HVT] 2. While watching the screen, adjust the FOCUS VR to
IF CIRCUIT ADJUSTMENT
Item Measuring Test point Adjustment part Description
Adjustment Remote T010 TRANSF. • Do not make any adjustment unless the adjustment is
out of control unit way and you cannot get correct PICTURE.
of VCO
instrument
DC Voltmeter X Connector 3. Make sure that the voltage is DC150 ± 2.0V.
instrument
instrument
VCO (CW)
TOO HIGH 2. Press 1 key and select 1 .VCO.
ABOVE REFERENCE 3. Select a receivable broadcast channel with the
BELOW REFERENCE YELLOW CHANNEL key.
TOO LOW : EXIT characters TOO HIGH displayed on the screen changes
Main PWB
make the vertical and horizontal lines as fine and sharp
as possible.
3. Make sure that when the screen is darkened, the
lines remain in good focus.
MHz fV 1. Select 1.IF from the SERVICE MENU.
***.**
➔
➔
4. Turn the core of T010 TRANSF. until the colour of the
from blue to yellow. (Step 1)
5. Then slowly tum the core of T010 TRANSF. to the left
until the colour of the characters BELOW REFERENCE
changes from blue to yellow. (Step 3)
6. Press the display key three times to retum to normal
screen.
7. Perform CHANNEL PRESET again, and make sure
that each broadcast is being received properly.
3. BASIC OPERATION OF SERVICE MENU
1) How to enter SERVICE MENU
Press the DISPLAY key and the CINEMA/GAME key of the REMOTE CONTROL UNIT simultaneously. The SERVICE MENU screen of Fig.1 will be displayed.
SERVICE MENU
SERVICE MENU
1. IF 2. V/C
3.AUDIO 4.DEF
5.VSM PRESET
1-5: SELECT : EXIT
Fig. 1
NAMES OF REMOTE CONTROL KEY
3) Method of Setting
1) Method of Setting 1. IF
[1. VCO]
(1)1 Key. Select 1.IF.
(2)1 Key. Select 1.VCO.
(3)The VCO (CW) screen will be displayed in yellow when the AFC voltage is at a certain level and
in blue when it is at other levels.
(4) DISPLAY Key. As you press this twice, you will return to the SERVICE MENU.
[2. DELAY POINT]
1) 1 Key. Select 1.IF.
2) 2 Key. Select 2.DELAY POINT.
3) FUNCTION -/ + Key Set (adjust) the setting values of the setting items.
4) VIDEO/SOUND Key. Memorize the set value. (Before storing the setting values in memory, do
not press the CH, TV / EXT, DISPLAY, POWER ON / OFF keys - if you do, the values will not be
stored in memory.)
5) DISPLAY Key. When this is pressed twice, you will return to the SERVICE MENU.
2) Method of setting 2.V/C, 3.AUDIO, 4.DEF and 5.VSM PRESET
1) 2 5 Keys. Select one from 2. V/C, 3. AUDIO, 4. DEF and 5. VSM PRESET
2) FUNCTION UP/DOWN Key. Select setting items.
3) FUNCTION - / + Key. Set (adjust) the setting values of the setting items. (When 1 CUTOFF of 2.V/C is
selected, press its “-“ or “+” FUNCTION key, and the whole screen will change to a faint horizontal
line appearing in its center. Press the same “-“ or +“ key agaln, and the screen will return to the
Screen display Step
1 ➝ 23
TOO HIGH Yellow ➝ Blue ➝ Blue
ABOVE REFERENCE Blue ➝ Yellow ➝ Blue
BELOW REFERENCE Blue ➝ Blue ➝ Yellow
TOO LOW Blue ➝ Blue
Item Measuring Adjustment part Description
instrument
Adjustment Remote DELAY POINT 1. Receive a black and white signal (colour off).
of DELAY control unit (AGC TAKE.OvER) 2. Select 1. IF from the SERVICE MENU.
POINT 3. Select 2. DELAY POINT by pressing the 2 key on the remote control unit.
(AGC) 4. Adjust the FUNCTION -/ + key until video noise disappears.
5. Press the VIDEO/SOUND key and memorise the set value.
6. Turn to other channels and make sure that there are not irregularities.
Setting Variable Initial setting
(adjustment) range value
item
DELAY POINT 0 ~ 63 4
(AGC TAKE-OVER)
VSM PRESET SETTING
Item Measuring Adjustment part Description
instrument
Setting of Remote 1. BRIGHT 1. Select 5.VSM PRESET from the SERVICE MENU.
VSM control unit 2. CONT. 2. Select STANDARD with the CINEMA/GAME key.
PRESET 3. COLOUR 3. Adjust the FUNCTION UP/DOWN and FUNCTION -/+ key to bring the set
4. SHARP values of 1.BRIGHT ~ 10. TREBLE to the values shown in the table.
5.TINT 4. Press the VIDEO/SOUND key and memorize the set value.
6. R DRIVE 5. Respectively selecl the VSM PRESET mode for USER, CINEMA and GAME,
7. G DRIVE and make similar adjustment as in 3 and 4 above.
8. B DRIVE
9. BASS
10.TREBLE
Specifications / Replacement of memory IC’s / Service Adjustments / Adjustments Cont’d (1) / Adjustments Cont’d (2) / Adjustments Cont’d (3)
Safety Parts / Sub Menu Screens / Main PCB 1 / Main PCB 2
Page 3
JVC AV-25TS1 EK
3
Service Adjustments Cont’d
SETTING VALUES OF VSM PRESET
Setting VSM Preset mode STAND. USER CINEMA GAME
1. BRIGHT SETTING VALUE 0 0 0 +2
2. CONT. SETTINGVALUE +10 +10 +2 +2
3. COLOUR SETTING VALUE 0 0 -2 0
4. SHARP SETTING VALUE +2 +2 -2 -2
5. TINT SETTING VALUE 0 0 0 0
8. R. DRIVE SETTING VALUE 0 0 0 0
7. G. DRIVE SETTING VALUE 0 0 -2 0
8. B. DRIVE SETTING VALUE 0 0 -6 0
9. BASS SETTING VALUE 0 0 +6 +4
10. TREBLE SETTING VALUE 0 0 +2 0
VIDEO/CHROMA CIRCUIT ADJUSTMENT
The setting (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.
Items in parentheses ( ) are automatically set to below table.
Setting Variable Initial
(adjustment) range setting
item value
1.CUTOFF ON / OFF OFF
2.R DRIVE -31 ~ +32 +12
3.G DRIVE -31 ~ +32 +2
4.B DRIVE -31 ~ +32 0
(Do not adjust) (Fixed)
5.BRIGHT -31 ~ +32 +6
6. CONT. -41 ~ +22 -5
Setting colour system
(adjustment) Variable PAL NTSC NTSC
item range 3.58 4.43
7. COLOUR TV -31 ~ +32 +3 - initial setting Comp.VIDEO -31 ~ +32 (+3) +12 (+12)
value
8. TINT Comp. VIDEO -31 ~ +32 - -2 (-2)
initial setting
value
9.SHARP TV -31 ~ +32 +2 - -
Item Measuring Adjustment part Description
Adjustment Signal R. CUT OFF VR 1. Receive a black and white signal (colour off).
of WHITE generator 2. Select 2.V/C from the SERVICE MENU.
BALANCE G. CUT OFF VR 3. Select 1. CUT OFF with the FUNCTION UP/DOWN key.
(Low light) Remote 4. Show one horizontal line with the FUNCTION -/ + key. With
Adjustment Signal 2. R. DRIVE 1. Receive a black and white signal (colour off).
of WHITE generator 3. G. DRIVE 2. Select 2.V/C with the SERVICE MENU.
BALANCE 3. Select 2.R DRIVE and 3.G DRIVE with the FUNCTION
(High light) Remote 4. B. DRIVE UP/DOWN key.
Adjustment Remote 5. BRIGHT 1. Receive any broadcast
of control unit 2. Select 2.V/C from the SERVICE MENU.
SUB BRIGHT 3. Select 5.BRIGHT with the FUNCTION UP/DOWN key.
Adjustment Remote 6. CONT. 1. Receive any broadcast.
of control unit 2. Select 2.V/C from the SERVICE MENU.
SUB CONT. 3. Select 6.CONT. with the FUNCTION UP/DOWN key.
Comp Video -31 ~ +32 0 0 (0)
instrument
control unit B. CUT OFF VR the SCREEN VR, adjust so that the horizontal line will not be too bright.
control unit (Do not adjust) 4. Change the screen colour to white with the FUNCTION -/+ key.
SCREEN VR 5. Tum the CUT OFF VR respectively for R, G and B fully to the (In HVT)
left (to the left direction when seen from the rear).
6. Gradually turn the SCREEN VR from the left end to the right direction
to bring one of the red, green and blue colours faintly visible.
7. By adjusting the CUT OFF VR, bring out the other 2 colours and make
one horizontal line visible in white
8. Turn the SCREEN VR and bring one white horizontal line faintly visible.
9. With the -/ + key, turn off 1 CUTOFF screen.
5.Press the VIDEO/SOUND key, and memorize the respectively set values.
4. Set the initial setting value with the FUNCTION -/ + key.
5. If the brightness is not the best with the initial set value, make fine
adjustment until you get the best brightness.
6. Press the VIDEO/SOUND key and memorize the set value.
4. Set the initial setting value with the FUNCTION -/ + key.
5. If the contrast is not the best with the initial set value, make
fine adjustment until you get the best contrast.
6. Press the VIDEO/SOUND key and memorize the set value.
Item Measuring Test point Adjustment part Description
Adjustment Remote 7. COLOUR [Method of adjustment without using measuring
of SUB control unit instrument]
COLOUR I PAL COLOUR (PAL COLOUR)
Adjustment Signal TP-47B 7. COLOUR [Method of adjustment using measuring instrument]
of SUB generator TP-E
COLOUR II Oscilloscope CRT PAL COLOUR (PAL COLOUR)
Adjustment Remote 8. TINT [Method of adjustment without using measuring
of control unit instrument]
SUB TINT I NTSC TINT (NTSC 3.58 TINT)
Adjustment Signal TP-47B 8. TINT [Method of adjustment using measuring instrument]
of generator TP-E
SUB TINT II CRT NTSC TINT (NTSC 3.58 TINT)
Adjustment Remote 9. SHARP 1. Receive any broadcast.
of SHARP control unit 2. Select 2. V/C from the SERVICE MENU.
instrument
1. Receive a PAL broadcast.
2. Select 2.V/C from the SERVICE MENU.
3. Select 7.COLOUR with the FUNCTION UP/DOWN key.
4. Set the initial setting value for PAL COLOUR with the
FUNCTION -/+ key.
5. If the colour is not the best with the initial set value,
make fine adjustment until you get the best colour.
6. Press the VIDEO/SOUND key and memorize the set
NTSC COLOUR (NTSC 3.58 COLOUR)
SOCKET 1. Receive a PAL full field colour bar signal (75% white).
PWB 1 2. Select 2.V/C from the SERVICE MENU.
Remote 4. Set the initial setting value of PAL COLOUR with the
control unit FUNCTION -/+ key.
NTSC COLOUR (NTSC 3.58 COLOUR)
Oscilloscope SOCKET 1.Input COMPOSITE VIDEO signal (full field colour bar
Remote 2. Select 2.V/C from the SERVICE MENU.
control unit 3. Select 8.TINT with the FUNCTION UP/DOWN key.
PWB 75% white) of NTSC 3.58MHz from the EXT terminal.
value.
7. Input NTSC 3.58MHz COMPOSITE VIDEO signal from
the EXT terminal.
8. Make similar fine adjustment of NTSC 3.58 COLOUR
as previously.
(NTSC 4.43 COLOUR)
When NTSC 3.58 is set, NTSC 4.43 will be automatically
set at the same value as NTSC 3.58.
3. Select 7.COLOUR with the FUNCTION UP/DOWN key.
5. Connect the oscilloscope to TP-47B and TP-E .
6. Adjust PAL COLOUR and bring the value of (A) in the
illustration to -10V
7. Press the VIDEO/SOUND key and memorize the seting
value.
1. Input NTSC 3.58MHz COMPOSITE VIDEO signal (full field
colour bar 75% white) from the EXT terminal.
2. Set the initial setting value of NTSC 3.58 COLOUR with
the FUNCTION -/+ key.
3. Adjust NTSC 3.58 COLOUR and bring the value of (A)
of the illustration to 0V.
4. Press the VIDEO/SOUND key and memorize the set
value.
(NTSC 4.43 COLOUR)
When NTSC 3.58 is set, NTSC 4.43 will be automatically
set at the same value as NTSC 3.58.
1.Input COMPOSITE VIDEO signal (full field colour bar
75% white) of NTSC 3.58MHz from the EXT terminal.
2. Select 2.V/C from the SERVICE MENU.
3. Select aTINT with the FUNCTION UP/DOWN key.
4. Set the initial setting value of NTSC 3.58 TINT with the
FUNCTION -/+ key.
5. If you cannot get the best tint with the initial setting
value, make fine adjustment until you get the best tint.
6. Press the VIDEO/SOUND key and memorize the set value.
(NTSC 4.43 TINT)
When NTSC 3.58 is set, NTSC 4.43 will be automatically
set at the same value as NTSC 3.58.
4. Set the initial setting value of NTSC 3.58 TINT with the
FUNCTION -/+ key.
5. Connect the oscilloscope to TP-47B and TP-E
6. Adjust NTSC 3.58 TINT to bring the value of (A) of the
illustration to 0V.
7. Press the VIDEO/SOUND key and memorize the setting
value.
(NTSC 4.43 TINT)
When NTSC 3.58 is set, NTSC 4.43 will be automatically
set at the same value as NTSC 3.58.
3. Select 9. SHARP with the FUNCTION UP / DOWN key.
4. Set the initial setting value with the FUNCTION -/ + key.
5. Press the VIDEO / SOUND key and memorize the setting
value
There are 2 modes of adjustment — (1) 50Hz 4: 3 and (2) 60Hz 4:3 - depending upon the kind of
signals (VERTICAL FREQUENCY 50Hz / 60Hz).
When adjusted in the (1) 50Hz 4:3 mode, the mode (2) will be linked to the mode (1) and will be
automatically adjusted for the same value.
When adjusted in the mode (2) , only this mode will be adjusted singly.
The setting (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
set values.
Setting Adjustment name Variable Initial setting value
(adjustment) range 50Hz 60Hz
item 4:3 4:3
1. V-SLOPE Vertical hight
(Size of bottom side of screen) -31 ~ + 32 +5 0
2. V-SHIFT Vertical center -31 ~ + 32 +3 -1
3. V-SIZE Vertical hight -31 ~ + 32 +7 -2
4. H-CENT Horizontal center -31 ~ + 32 +4 +9
5. H-SIZE Horizontal width -31 ~ + 32 +23 -1
6. EW-PIN Side pin correction -31 ~ + 32 -7 0
7. TRAPEZ Trapezoidal distortion correction -31 ~ + 32 +1 -3
S. V-S.CR Vertical height correction -31 ~ + 32 -3 0
(Fixed) (Fixed)
9. EW-COR Side pin tour corner -31 ~ + 32 -10 -2
correction (Fixed) (Fixed)
Item Measuring Adjustment part Description
instrument
1. Signal 1. V-SLOPE [(1)50Hz 4:3]
Adjustment generator 1. Receive a circle pattern signal of vertical frequency 50Hz.
of 2. Select 4.DEF from the SERVICE MENU.
VERTICAL Remote 3. Select 1 V-SLOPE with the FUNCTION UP/DOWN key.
SLOPE control unit 4. Set the initial setting value of V-SLOPE (50Hz 4:3) with the
FUNCTION -/+ key.
5. Adjust V-SLOPE and make the screen’s center line and the blanking
line coincide.
2. 2. V-SHIFT 6. Select 2.V-SHIFT and set the initial setting value.
Adjustment 7. Adjust V-SHIFT to make A B.
of VERTICAL 8. Press the VIDEO / SOUND key and memorize the set value.
SHIFT
3. 3. V-SIZE 9. Receive a cross-hatch signal.
Adjustment 10.Adjust 3.V-SIZE and set the initial setting value.
of VERTICAL 11.Adjust V-SIZE and make the vertical screen size 92% of the
SIZE picture size.
12. Press the VIDEO / SOUND key and memorize the set value.
4. 4. H-CENT 13. Receive a circle pattem signal.
Adjustment 14. Select 4.H-CENT and set the initial setting value.
of HORI. 15.Adjust H-CENT to make C=D.
CENTRE 16. Press the VIDEO/SOUND key and memorize the set value.
5. 5. H-SIZE 17.Receive a cross-hatch signal.
Adjustment 18. Select 5.H-SIZE and set the initial setting value.
of HORI. 19.Adjust H-SIZE and make the horizontal screen size 92% of
SIZE the picture size.
Specifications / Replacement of memory IC’s / Service Adjustments / Adjustments Cont’d (1) / Adjustments Cont’d (2) / Adjustments Cont’d (3)
Safety Parts / Sub Menu Screens / Main PCB 1 / Main PCB 2
Page 4
JVC AV-25TS1 EK
Service Adjustments Cont’d
Item Measuring Adjustment part Description
instrument
6. EW-PIN 20.Select 6.EW-PIN and set the initial setting value.
Adjustment 21 Adjust EW-PIN and make the 1st vertical lines at the left and
of EW-PIN right edges of the screen straight. Also make sure that the 2nd vertical
lines are also straight
7. 7. TRAPEZ 22.Select 7.TRAPEZ and set the initial setting value.
Adjustment 23.Adjust TRAPEZ and bring the ver~cal lines at the right and left
of TRAPEZ edges of the screen in parallel.
8. 8. V-S. CR 24. Select 8.V-S. CR and set the initial setting values.
Adjustment 25.Adjust V-S. CR and make the gaps between the horizontal
of V-S. CR lines same.
* No alignment, but adjust this mode if result of no alignment is too bad.
9. 9. EW-COR 26. Select 9.EW-COR and set the initial setting values.
Adjustment 27.Adjust EW-COR and make the vertical lines at the four
of EW-COR comers of the screen straight.
28. Press the VIDEO/SOUND key and memorize the set values.
* No alignment, but adjust this mode if result of no alignment is too bad.
29. Make sure that the adjustement is properly done on the screen of
(2) 60Hz 4 : 3. AUDIO CIRCUIT
4
Main PCB 1 Diagram Click Here
3. AUDIO CIRCUIT
Do not touch 3.AUDIO (1. CONC LIMIT, 2. A2 ID THR) of the SERVICE MENU as it requires no
adjustment.
Setting (adjustment) item Variable range Initial setting value (fixed)
1. CONC LIMIT (Do not adjust) 00H ~ FFH 0AH
2. A2 ID THR (Do not adjust) 00H ~ FFH 19H
Specifications / Replacement of memory IC’s / Service Adjustments / Adjustments Cont’d (1) / Adjustments Cont’d (2) / Adjustments Cont’d (3)
Safety Parts / Sub Menu Screens / Main PCB 1 / Main PCB 2
Page 5
JVC AV-25TS1 EK
5
Main PCB 1 Diagram
Specifications / Replacement of memory IC’s / Service Adjustments / Adjustments Cont’d (1) / Adjustments Cont’d (2) / Adjustments Cont’d (3)
Safety Parts / Sub Menu Screens / Main PCB 1 / Main PCB 2
Page 6
JVC AV-25TS1 EK
6
Main PCB 2 Diagram
Specifications / Replacement of memory IC’s / Service Adjustments / Adjustments Cont’d (1) / Adjustments Cont’d (2) / Adjustments Cont’d (3)
Safety Parts / Sub Menu Screens / Main PCB 1 / Main PCB 2
Loading...