Audio 500mV(rms) (-4dBs), high impedance, RCA pin jack × 2
Design & specifications are subject to change without notice.
1-2 (No.YA181)
SECTION 1
PRECAUTION
1.1SAFETY 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 can 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 ( ) 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) 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 different 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 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.
(5) 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).
(6) 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.
(7) 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.
(8) 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.
(9) 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 3000V 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.
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 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 1000Ω per volt or more
sensitivity 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 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.).
AC VOLTMETER
(HAVING 1000 /V,
OR MORE SENSITIVITY)
0.15 F AC-TYPE
PLACE THIS PROBE
1500 10W
GOOD EARTH GROUND
ON EACH EXPOSED
ME TAL PAR T
(No.YA181)1-3
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1FEATURES
• New chassis design enable use of an interactive on screen
control.
• The TELETEXT SYSTEM has a built-in FASTEXT (UK
system) and WST (world standard system) system.
2.221-pin Euro connector (SCART) : EXT-1/EXT-2/EXT-3
Pin No. Signal designationMatching valueEXT-1EXT-2EXT-3
1AUDIO R output500mV(rms) (Nominal), Low impedanceUsed (TV OUT) Used (LINE OUT)Not used
2AUDIO R input500mV(rms) (Nominal), High impedanceUsed (R1)Used (R2)Used (R3)
3AUDIO L output500mV(rms) (Nominal), Low impedanceUsed (TV OUT) Used (LINE OUT)Not used
4AUDIO GND---UsedUsedUsed
5GND (B)---UsedUsedUsed
6AUDIO L input500mV(rms) (Nominal), High impedanceUsed (L1)Used (L2)Used (L3)
7B input700mV
FUNCTION SW
8
(SLOW SW)
Low : 0V-3V
High : 8V-12V, High impedance
, 75ΩUsedUsedNot used
(B-W)
9GND (G)---UsedUsedUsed
10SCL / T-V LINK---Not used
11G input700mV
, 75ΩUsedUsedNot used
(B-W)
12SDA---Not used Used (SDA2)Not used
13GND (R)---UsedUsedUsed
14GND (YS)---UsedNot usedNot used
15R / C input
R : 700mV
C : 300mV
(B-W)
(P-P)
, 75Ω
, 75Ω
16Ys input (FAST SW) Low : 0V-0.4V, High : 1V-3V, 75ΩUsedUsedNot used
17GND (VIDEO output)---UsedUsedUsed
18GND (VIDEO input)---UsedUsedUsed
19VIDEO output1V
20VIDEO / Y input1V
(Negative sync), 75ΩUsed (TV OUT) Used (LINE OUT)Not used
(P-P)
(Negative sync), 75ΩUsedUsedUsed
(P-P)
21COMMON GND---UsedUsedUsed
(P-P= Peak to Peak, B-W= Blanking to white peak)
• Because this TV unit corresponds to multiplex broadcast,
users can enjoy music programs and sporting events with live
realism. In addition, BILINGUAL programs can be heard in
their original language.
• Users can make VCR dubbing of picture and sound by
controlling the AV selector to select an optional source at the
EXT-2 output.
9 VrefP_SdacI 3.3V73 YsyncI Y for sync sep
10 XtalInI System clock(4MHz)74 YoutO Y (for 73pin)
11 XtalOutO System clock(4MHz)75 Uout/INSSW2I Ys (for EXT-1 Y/R-Y/B-Y insertion)
12 VssA1-- GND76 Vout/Swo1-- NC
13 VguardI CRT neck broken protection [Detect: L]77 INSSW3I Ys (for EXT-2 Y/R-Y/B-Y insertion)
14 DecDigI 1.8V78 R3/PrI EXT-2 R-Y
15 V5P1I 5V79 G3/YI EXT-2 Y
16 Phi2-- Not used80 B3/PbI EXT-2 B-Y
17 Phi1-- Not used81 Gnd3-- GND
18 Gnd1-- GND82 V5P3I 5V
19 SecPll-- Not used83 BCLI Automatic beam / contrast limit
20 Dec8G-- Not used84 BLKINI CRT cathode current (For Auto white balance)
21 Ewd/AvlO Parabola wave85 RoutO Red (for CRT)
22 VdbO V. drive(-)86 GoutO Green (for CRT)
23 VdaO V. drive(+)87 BoutO Blue (for CRT)
24 Vif1I VIF88 V3.3A1I 3.3V
25 Vif2I VIF89 RefAdN-- Not used
26 Vsc-- Not used90 V3.3RefAdP-- Not used
27 Iref-- Not used91 RefAd-- Not used
28 GndIF-- GND92 GndA-- GND
29 Sif1I SIF93 V1.8AI 1.8V
30 Sif2I SIF94 V3.3A2I 3.3V
31 AgcO AGC voltage95 VssAD-- GND
32 EHTI HV change correction96 V1.8ADCI 1.8V
33 Ssif/RefIn/Avl/RefOut O L'/Other SW [L'system: H]97 IntOI Remote control
34 AudoIn5LI Audio (Left)98 P10/Int1I TV_LINK control
35 AudioIn5RI Audio (Right)99 P11/TOO TV_LINK control
36 AudOutSLO Audio (Left)100 V1.8C2I 1.8V
37 AudOutSRO Audio (Right)101 VssC2-- GND
38 DecsDem-- Not used102 P04/I2SWsO I
39 QssO/AmO/AudeEm -- Not used103 P03/I2SClkI I
40 Gnd2-- GND104 P02/I2SDo2I/O I
41 PllIf-- Not used105 P01/I2SDo1O Reset for DAC
42 SifAgc-- Not used106 P00/I2SDI1I Headphone connection detection [Connect: L]
43 IfVo/FmRo/DvbOO Composite video detect107 P13/T1O Main power control [ON : H]
44 FmRo/DvbO-- Not used108 SCL1O I
45 V8AudioSwitchesI 8V109 SDA1I/O I
46 AgcSsif-- Not used110 V3.3P-- GND
47 V5P2I 5V111 P20/TPwmO Rotation control
48 SVO/IfVo/Cvbsl-- Not used112 P21/Pwm0O S-correction control [PANORAMIC: L]
49 Audio4InL-- Not used113 P22/Pwm1O Audio muting [Muting: L]
50 Audio4InR-- Not used114 P23/Pwm2O Audio muting [Muting: H]
51 Y4/Cvbs4I Composite video /Y115 P30/Adc0I Protection detection for Low B short [Detect: H]
52 C4I Chroma116 P31/Adc1O Lighting for POWER LED [ON :RED]
53 Audio2InL-- Not used117 V1.8C1I 1.8V
54 Audio2InR-- Not used118 DecV1V8I 1.8V
55 Cvbs2/Y-- Not used119 P32/Adc2I Key scan front control
56 Audio3InL-- Not used120 P33/Adc3I AGC
57 Audio3InR-- Not used121 VssC1+P1-- GND
58 Y3/Cvbs-- Not used122 P24/PW3-- Not used
59 C3-- Not used123 P25/PWM4O Reset for main CPU
60 AudOutLsL-- Not used124 V1.8C3I 1.8V
61 AudOutLsR-- Not used125 VssC3-- GND
62 AudOutHpL-- Not used126 P12/Int2I Main power detection [ON: H]
63 AudOutHpR-- Not used127 P14/RXI/O I
64 CVBSO/PIP-- Not used128 P15/TXO I
Pin
No.
Pin nameI/OFunction
2
S bus (WS) for DSP
2
S bus (clock) for DAC
2
S bus (Data) for audio
2
C bus (clock) for AV SW, TUNER, VOLUME
2
C bus (data) for AV SW, TUNER, VOLUME
2
C bus (data) for generally
2
C bus (clock) for generally
(No.YA181)1-5
SECTION 3
DISASSEMBLY
3.1 DISASSEMBLY PROCEDURE
3.1.1 REMOVING THE REAR COVER
(1) Unplug the power plug.
(2) Remove the sub woofer cord from the AV TERMINAL
BOARD.
(3) Remove the SUB WOOFER UNIT on the top of the rear
cover upward.
(4) Remove the 13 screws [A] as shown in Fig.3.
(5) Withdraw the REAR COVER toward you.
3.1.2 REMOVING THE SIDE CONTROL JACK ASSY
• Remove the REAR COVER.
(1) Remove the screw [B] as shown in Fig.3.
(2) Slightly pull the SIDE CONTROL JACK ASSY toward you,
and detach the claw from FRONT CABINET.
Then it can be removed.
(3) Then disconnect the connector [S], [F] and [K] as shown
in Fig 1.
3.1.3 REMOVING THE SIDE CONTROL PWB
• Remove the REAR COVER.
• Remove the SIDE CONTROL JACK ASSY.
(1) Remove the 3 claws [C] from backside of the SIDE
CONTROL JACK ASSY as shown in Fig.1.
(2) Remove the SIDE CONTROL PWB from the SIDE
CONTROL JACK ASSY.
3.1.4 REMOVING THE AV TERMINAL BOARD
• Remove the REAR COVER.
(1) Remove the 5 screws [G] as shown in Fig. 3.
(2) Remove the 2 claws [H] at the bottom of the AV
TERMINAL BOARD as shown in Fig. 2.
(3) Shift the AV TERMINAL BOARD slightly in the direction of
arrow [I], and remove it as shown in Fig. 2.
3.1.5 REMOVING THE MAIN CHASSIS
• Remove the REAR COVER.
(1) Slightly raise the MAIN CHASSIS, and release the two claws
at the bottom of and both sides of the MAIN CHASSIS.
(2) Then withdraw the MAIN CHASSIS backward from the
front cabinet. (If necessary, detach the wire clamp,
connectors etc.)
3.1.6 REMOVING THE MAIN SPEAKER
• Remove the REAR COVER.
(1) Remove the 2 screws [E], and detach the MAIN SPEAKER
HOLDER as shown in Fig. 3. (When removing the screws
[E] of the MAIN SPEAKER HOLDER, the lower side screw
first, and then upper one.)
(2) Remove the 4 screws [F], which attached the MAIN
SPEAKER.
(3) Follow the same steps when disassemble the other hand
MAIN SPEAKER.
3.1.7 REMOVING THE CENTER SPEAKER
• Remove the REAR COVER.
• Remove the MAIN CHASSIS.
(1) Remove the 2 screws [D] as shown in Fig. 3.
(2) Remove the CENTER SPEAKER. If necessary, detach the
cables.
3.1.8 CHECKING THE PW BOARD
(1) Pull out the MAIN CHASSIS (Refer to REMOVING THE
MAIN CHASSIS).
(2) Erect the CHASSIS vertically with the HVT side facing up
so that you can easily check the back side of the PW board.
3.1.9 CAUTION
(1) When erecting the MAIN CHASSIS, be careful so that
there will be no contacting with other PWB.
(2) Before turning power on, make sure that the wire connector
is properly connected.
(3) 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.
3.1.10 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.
Connector
C
S
F
K
CONTROL
(Back view)
FRONT
SIDE
PWB
C
Fig.1
I
AV
TERMINAL
BOARD
H
AV JACK PWB
H
Fig.2
1-6 (No.YA181)
FRONT CABINET
E
SIDE
CONTROL
PWB
SIDE CONTROL
JACK ASSEMBLY
MAIN SPEAKER
HOLDER
CRT SOCKET PWB
FRONT CONTOL PWB
CLAW
AV JACK PWB
CONTROL
BASE
CLAW
B
MAIN PWB
AUDIO CONTROL
PWB
POWER & DEF.PWB
AV TERMINAL
BOAD
F
MAIN
SPEAKER
G
REAR COVER
POWER CORD
A
Fig.3
(No.YA181)1-7
3.1.11 REMOVING THE CRT
NOTE:
• Replacement of the CRT should be performed by 2 or more
persons.
• After removing the REAR COVER, CHASSIS etc.,
(1) Putting the CRT change table on soft cloth, the CRT
change table should also be covered with such soft cloth
(shown in Fig. 4).
(2) While keeping the surface of CRT down, mount the TV set
on the CRT change table balanced will as shown in Fig. 4.
(3) Remove 4 screws marked by arrows with a box type
screwdriver as shown in Fig. 5.
NOTE:
Since the cabinet will drop when screws have been
removed, be sure to support the cabinet with hands.
(4) After 4 screws have been removed, put the cabinet slowly
on cloth (At this time, be carefully so as not to damage the
front surface of the cabinet) shown in Fig. 6.
NOTE:
• The CRT should be assembled according to the
opposite sequence of its dismounting steps.
• The CRT change table should preferably be smaller
that the CRT surface, and its height be about 35cm.
CRT CHANGE TABLE
CLOTH
CRT
CHANGE
TABLE
Fig.4
CRT
Fig.5
APPROX.
35cm
BOX
TYPE
SCREW
DRIVER
CRT
CABINET
CRT
CHANGE TABLE
Fig.6
COATING OF SILICON GREASE FOR ELECTRICAL INSULATION ON THE CRT ANODE CAP SECTION.
Subsequent to replacement of the CRT and HV transformer or repair of the anode cap, etc. by dismounting them, be sure to coat
silicon grease for electrical insulation as shown in Fig.7. Wipe around the anode button with clean and dry cloth. (Fig.7) Coat silicon
grease on the section around the anode button. At this time, take care so that any silicon greases dose not sticks to the anode
button. (Fig.8)
Silicon grease product No. KS - 650N
CRT
Anode button
Approx.
20mm (Do not
coat grease on
this section
Silicon grease
should be coated
by 5mm or more
from the outside
diameter of anode
cap.
1-8 (No.YA181)
Silicon grease
coating
Fig.7
Anode button
(No sticking of
silicon grease)
Fig.8
Coating position
of silicon grease
Anode cap
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 from the
AC outlet.
2. Replace the memory IC
Be sure to use the memory IC written with the initial setting
values.
3. Power on
Connect the power plug to the AC outlet and switch on the
power.
4. System constant check and setting
* It must not adjust without signal.
(1) Press the [INFORMATION] key and the [MUTING] key of
the REMOTE CONTROL UNIT simultaneously.
(2) The SERVICE MENU screen of Fig. 1 will be displayed.
(3) While the SERVICE MENU is displayed, press the
Address
Setting data
[INFORMATION] key and [MUTING] key simultaneously,
and the SYSTEM CONSTANT SET screen of Fig. 2 will
be displayed.
(4) Refer to the "SYSTEM CONSTANT SET" , and check
the setting items. Where these differ, select the addres
with the [FUNCTION (UP/ DOWN)] key and adjust it with
the [FUNCTION (RIGHT/ LEFT)] keys. (The letter of the
selected item is displayed in yellow.)
(5) A setup will become effective if the main power is shut off.
5. Receiving channel setting
Refer to the OPERATING INSTRUCTIONS and set the
receive channels (Channels Preset) as described.
6. User settings
Check the user setting items according to the given in page
later.
Where these do not agree, refer to the OPERATING
INSTRUCTIONS and set the items as described.
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.
SERVICE MENU
1. IF2. V/C
3. AUDIO4. DEF
5. VSM PRESET 6. VPS
7. SHIPPING (OFF)
MODEL=JW EURO (XXXXX)
Fig.1
EEP EDIT (LAST MEMORY)
TOP ADDRESS=000H
00 01 02 03 04 05 06 07
8F 00 FE FF FF FF FF FF
08 09 0A 0B 0C 0D 0E 0F
FF 01 BB FC 1F F9 FF FF
Fig.2
NAME OF REMOTE CONTROL KEY
Names of key
INFORMATION
MUTING
MENU
FUNCTION UP/DOWN
FUNCTION -/+
key
OK
Do not adjust
3.2.2 SYSTEM CONSTANT SETTING
AddressSetting data
008F
0102
(No.YA181)1-9
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