JVC AV-28H40SU, AV-28H4BU, AV-28H4SU, AV-28H77SK, AV-32H40SU Service Manual
...
SERVICE MANUAL
COLOUR TELEVISION
YA06320043
AV-28H4BU, AV-28H4SU,
AV-28H40SU, AV-28H77SK,
AV-32H4BU, AV-32H4SU,
AV-32H40SU, AV-32H47SU,
AV-32H77SK
BASIC CHASSIS
ML2
1 2 3
4 5 6
7 8 9
0
AV
MENU
P
TV OK
P
TV
AV-28H4SU, AV-28H4BU
AV-32H4SU, AV-32H4BU
AV-28H40SU, AV-28H77SK
AV-32H40SU, AV-32H77SK
AV-32H47SU
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
5 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED
No.YA063
2004/3
SPECIFICATION
Content
Item
Dimensions ( W × H × D ) 76.2cm × 52.8cm × 49.3cm 85.4cm × 50.8cm × 49.0cm
Mass 39.0kg
TV RF System CCIR (B/G, D/K, I, L) CCIR (I)
Colour System PAL
SECAM
NTSC 3.58 / NTSC 4.43 (Only in EXT mode)
Stereo System A2 (B/G, D/K)
NICAM (B/G, I, D/K, L)
Teletext System FLOF (Fastext)
TOP (German system)
WST (World standard system)
Receiving
Frequency
French CATV 116MHz ~ 172MHz
Intermediate
Frequency
Colour Sub
Carrier Frequency
Power Input AC220V ~ AC240V, 50Hz
Power Consumption 120W, standby : 2.5W
Aerial Input Terminal 75Ω unbalanced, coaxial
Picture Tube Visible size : 66cm, Measured diagonally H : 58.3cm × V : 33.0cm
High Voltage 31.0kV (+1kV / -1.5kV) (at zero beam current)
Speaker 13cm × 6.5cm oval type × 2
Audio Power Output 10W + 10W
EXT-1 / EXT-2 / EXT-3
(Input / Output)
EXT-4 (Input) S-Video
AUDIO OUT (Variable) 0~1000mV(rms), Low impedance, RCA pin jack × 2
Headphone Jack 3.5mm Stereo mini jack × 1
Remote Control Unit RM-C64H (AAA/R03 dry battery × 2)
VHF 47MHz ~ 470MHz ---
UHF 470MHz ~ 862MHz
220MHz ~ 469MHz
VIF 38.9MHz (B/G, D/K, I, L) 38.9MHz (I)
SIF 33.4MHz (5.5MHz:B/G)
32.9MHz (6.0MHz:I)
32.4MHz (6.5MHz:L, D/K)
PAL 4.43MHz
SECAM 4.40625MHz / 4.25MHz ---
NTSC 3.58MHz / 4.43MHz
21-pin Euro connector, SCART socket × 3
Mini-DIN 4 pin × 1
Y : 1V(p-p) positive (negative sync, 75Ω)
C : 0.3V(p-p) (Burst signal, 75Ω)
Video
1V(p-p) 75ohm, RCA pin jack × 1
Audio (L/R)
500mV(rms) (-4dBs), High impedance, RCA pin jack × 2
AV-28H4BU
AV-28H4SU
AV-28H40SU AV-28H77SK
PAL
NTSC 3.58 / NTSC 4.43
(Only in EXT mode)
NICAM (I)
FLOF (Fastext)
WST(World standard system)
32.9MHz (6.0MHz:I)
---
Design & specifications are subject to change without notice.
1-2 (No.YA063)
Content
Item
Dimensions ( W × H × D )
Mass 53.0kg 52.5kg 53.0kg
TV RF System CCIR (B/G, D/K, I, L) CCIR (I)
Colour System PAL
Stereo System A2 (B/G, D/K)
Teletext System FLOF (Fastext)
Receiving
Frequency
Intermediate
Frequency
Colour Sub
Carrier Frequency
Power Input AC220V ~ AC240V, 50Hz
Power Consumption 130W, standby : 2.5W
Aerial Input Terminal 75Ω unbalanced, coaxial
Picture Tube Visible size : 76cm, Measured diagonally H : 67.4cm × V : 38.4cm
High Voltage 31.0kV (+1kV / -1.5kV) (at zero beam current)
Speaker 13cm × 6.5cm oval type × 2
Audio Power Output 10W + 10W
EXT-1 / EXT-2 / EXT-3
(Input / Output)
EXT-4 (Input) S-Video
AUDIO OUT (Variable) 0~1000mV(rms), Low impedance, RCA pin jack × 2
Headphone Jack 3.5mm Stereo mini jack × 1
Remote Control Unit RM-C64H (AAA/R03 dry battery × 2)
Design & specifications are subject to change without notice.
VHF 47MHz ~ 470MHz ---
UHF 470MHz ~ 862MHz
French
CATV
VIF 38.9MHz (B/G, D/K, I, L) 38.9MHz (I)
SIF 33.4MHz (5.5MHz:B/G)
PAL 4.43MHz
SECAM 4.40625MHz / 4.25MHz ---
NTSC 3.58MHz / 4.43MHz
Video
Audio (L/R)
AV-32H4BU
AV-32H4SU
86.4cm × 58.7cm × 55.0cm 94.6cm × 56.1cm × 54.7cm 94.8cm × 56.2cm × 55.0cm 94.6cm × 56.1cm × 54.7cm
SECAM
NTSC 3.58 / NTSC 4.43 (Only in EXT mode)
NICAM (B/G, I, D/K, L)
TOP (German system)
WST(World standard system)
116MHz ~ 172MHz
220MHz ~ 469MHz
32.9MHz (6.0MHz:I)
32.4MHz (6.5MHz:L, D/K)
21-pin Euro connector, SCART socket × 3
Mini-DIN 4 pin × 1
Y : 1V(p-p) positive (negative sync, 75Ω)
C : 0.3V(p-p) (Burst signal, 75Ω)
1V(p-p) 75ohm, RCA pin jack × 1
500mV(rms) (-4dBs), High impedance, RCA pin jack × 2
AV-32H40SU AV-32H47SU AV-32H77SK
PAL
NTSC 3.58 / NTSC 4.43
(Only in EXT mode)
NICAM (I)
FLOF (Fastext)
WST
(World standard system)
32.9MHz (6.0MHz:I)
---
(No.YA063)1-3
SECTION 1
PRECAUTION
1.1 SAFETY PRECAUTIONS [EXCEPT FOR UK]
(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
1-4 (No.YA063)
1.2 SAFETY PRECAUTIONS [FOR UK]
(1) The design of this product contains special hardware and 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 product 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 product have special safety-related characteristics. These characteristics are often
not evident from visual inspection nor can the protection afforded by them necessary 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 the 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) The leads in the products are routed and dressed with ties, clamps, tubing’s, barriers and the like to be separated from live parts,
high temperature parts, moving parts and / or sharp edges for the prevention of electric shock and fire hazard. When service is
required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to
normal, after re-assembling.
WARNING
(1) The equipment has been designed and manufactured to meet international safety standards.
(2) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
(3) Repairs must be made in accordance with the relevant safety standards.
(4) It is essential that safety critical components are replaced by approved parts.
(5) If mains voltage selector is provided, check setting for local voltage.
(No.YA063)1-5
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 FEATURES
• New chassis design enable use of an interactive on screen
control.
• The TELETEXT SYSTEM has a built-in FASTEXT (UK
system), TOP (German system) and WST (world standard
system) system.
2.2 21-pin Euro connector (SCART) : EXT-1/EXT-2/EXT-3
Pin No. Signal designation Matching value EXT-1 EXT-2 EXT-3
1 AUDIO R output 500mV(rms) (Nominal), Low impedance Used (TV OUT) Used (LINE OUT) Not used
2 AUDIO R input 500mV(rms) (Nominal), High impedance Used (R1) Used (R2) Used (R3)
3 AUDIO L output 500mV(rms) (Nominal), Low impedance Used (TV OUT) Used (LINE OUT) Not used
4 AUDIO GND Used Used Used
5GND (B) Used Used Used
6 AUDIO L input 500mV(rms) (Nominal), High impedance Used (L1) Used (L2) Used (L3)
7 B input 700mV
FUNCTION SW
8
(SLOW SW)
9GND (G) Used Used Used
10 SCL / T-V LINK Not used
11 G input 700mV
12 SDA Not used Used (SDA2) Not used
13 GND (R) Used Used Used
14 GND (YS) Used Not used Not used
15 R / C input
16 Ys input (FAST SW) Low : 0V-0.4V, High : 1V-3V, 75Ω Used Used Not used
17 GND (VIDEO output) Used Used Used
18 GND (VIDEO input) Used Used Used
19 VIDEO output 1V
20 VIDEO / Y input 1V
21 COMMON GND Used Used Used
Low : 0V-3V
High : 8V-12V, High impedance
R : 700mV
C : 300mV
(P-P)
(P-P)
, 75Ω Used Used Not used
(B-W)
, 75Ω Used Used Not used
(B-W)
, 75Ω
(B-W)
, 75Ω
(P-P)
(Negative sync), 75Ω Used (TV OUT) Used (LINE OUT) Not used
(Negative sync), 75Ω Used Used Used
(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 shown in figure.
Used Used Used
Used
(SCL2 / TV-LINK)
Used (R) Used (C2/R) Used (C3)
Not used
[Pin assignment]
20 18 16 14 12 10 8 6 4 2
21 19 17 15 13 11 9 7 5 3 1
2.3 MAIN DIFFERENCE LIST
Item AV-28H4BU AV-28H4SU AV-28H40SU AV-28H77SK
Dimensions ( W × H × D )
Mass 39.0kg ←←←
Cabinet colour Black Silver ←←
Power cord EU type(2-pin) ←←UK type(3-pin)
Colour system PAL, SECAM
RF system CCIR (B/G, D/K, I, L)
Item AV-32H4BU AV-32H4SU AV-32H40SU AV-32H47SU AV-32H77SK
Dimensions ( W × H × D )
Mass 53.0kg ←←52.5kg 53.0kg
Cabinet colour Black Silver
Power cord EU type(2-pin) ←←←UK type(3-pin)
Colour system PAL, SECAM
RF system CCIR (B/G, D/K, I, L)
76.2cm × 52.8cm × 49.3cm
86.4cm × 58.7cm × 55.0cm
←
85.4cm × 50.8cm × 49.0cm
←
←←PAL
←←CCIR (I)
←
94.6cm × 56.1cm × 54.7cm 94.8cm × 56.2cm × 55.0cm 94.6cm × 56.1cm × 54.7cm
←←←
←←←PAL
←←←CCIR (I)
1-6 (No.YA063)
2.4 TECHNINAL INFORMATION
2.4.1 MAIN MI-COM (CPU) PIN FUNCTION
Pin
Pin name I/O Function
No.
1 TCK I Not used 65 D2 I/O Data bit for PP-RAM/SD-RAM
2 TMS I Not used 66 D12 I/O Data bit for PP-RAM/SD-RAM
3 TDI I Not used 67 D10 I/O Data bit for PP-RAM/SD-RAM
4 TDO O Not used 68 VSS33 -- GND
5 P2.8 I Remote control 69 VDD33 i 3.3V
6 P2.9 I Key scan for front control CH+(On: L) 70 D4 I/O Data bit for PP-RAM/SD-RAM
7 P2.10 I Key scan for front control CH- (On: L) 71 D3 I/O Data bit for PP-RAM/SD-RAM
8 P2.11 I Key scan for front control MENU (On: L) 72 D11 I/O Data bit for PP-RAM/SD-RAM
9 P2.12 I Receive data for TV_LINK 73 RSTIN I Reset for main CPU
10 P2.13 O Power on /off control (ON: L) 74 P3.0 I/O Data for inter IC control bus
11 P2.14 I
12 P2.15 I Main power detection (Normal: H) 76 P3.2 I Remote control
13 VSS33 -- GND 77 P3.3 O Power indication control (On: L)
14 VDD33 i 3.3V 78 P3.4 O Audio muting (Muting: H)
15 P4.5/CS3 O Output data for TV_LINK 79 P3.5 O Audio muting (Muting: H)
16 P4.4/A20 O Address bit for PP-RAM/SD-RAM 80 P3.6 O Not used
17 P4.3/A19 O Address bit for PP-RAM/SD-RAM 81 P3.7 O Not used
18 P4.2/A18 O Address bit for PP-RAM/SD-RAM 82 P3.8 I/O Not used
19 P4.1/A17 O Address bit for PP-RAM/SD-RAM 83 P3.9 I/O Not used
20 VSS25 -- GND 84 VSS33 -- GND
21 VDD25 I 2.5V 85 VDD33 I 3.3V
22 P4.0/A16 O Address bit for PP-RAM/SD-RAM 86 VSS25 -- GND
23 A8 O Address bit for PP-RAM/SD-RAM 87 VDD25 I 2.5V
24 A7 O Address bit for PP-RAM/SD-RAM 88 TXD0 I/O Not used
25 A9 O Address bit for PP-RAM/SD-RAM 89 RXD0 I/O Not used
26 A6 O Address bit for PP-RAM/SD-RAM 90 P3.12 O Not used
27 A5 O Address bit for PP-RAM/SD-RAM 91 P3.13 O Not used
28 A10 O Address bit for PP-RAM/SD-RAM 92 P3.15 O Not used
29 A11 O Address bit for PP-RAM/SD-RAM 93 P5.14 I RGB input of EXT-2 active
30 A12 O Address bit for PP-RAM/SD-RAM 94 P5.15 I Headphone connection detection (Connect: H)
31 VSS33 -- GND 95 TRIG_IN -- Not used
32 VDD33 i 3.3V 96 TRIG_OUT -- Not used
33 A4 O Address bit for PP-RAM/SD-RAM 97 P6.2 O Notifies bus free state (Stop mode: H)
34 A3 O Address bit for PP-RAM/SD-RAM 98 P6.3 O Clock for inter IC control bus
35 A2 O Address bit for PP-RAM/SD-RAM 99 P6.4 I/O Data for inter IC control bus
36 A1 O Address bit for PP-RAM/SD-RAM 100 P6.5 O MSP reset (Reset: H)
37 A0 O Address bit for PP-RAM/SD-RAM 101 P6.6 -- Not used
38 A13 O Address bit for PP-RAM/SD-RAM 102 VSYNC I Vertical sync
39 A14/RAS O Row address strobe for SD-RAM access 103 HSYNC I Horizontal sync
40 A15/CAS O Column address strobe for SD-RAM access 104 COR/RSTOUT O Output for contrast reduction
41 VSS33 -- GND 105 BLANK/CORBLA O Ys for OSD Teletext (blanking)
42 VDD33 I 3.3V 106 VDD33 I 3.3V
43 MEMCLK O Clock for SD-RAM 107 VSS33 -- GND
44 CSSDRAM O Chip select signal for SD-RAM device 108 XTAL1 I System clock (4MHz)
45 CLKEN O Enable for memory clock 109 XTAL2 O System clock (4MHz)
46 CSROM O Chip select signal for PP-ROM device 110 VSSA -- GND
47 RD O External memory read strobe for PP-ROM 111 VDDA I 2.5V
48 UDQM O Write disable for high byte 112 R O Red for OSD / Teletext
49 LDQM O Write disable for low byte 113 G O Green for OSD / Teletext
50 WR O Memory write strobe 114 B O Blue for OSD / Teletext
51 D15 I/O Data bit for PP-RAM/SD-RAM 115 VSSA -- GND
52 VSS33 -- GND 116 VDDA -- 2.5V
53 VDD33 I 3.3V 117 CVBS2 I Composite video for WSS
54 D7 I/O Data bit for PP-RAM/SD-RAM 118 VSSA -- GND
55 D0 I/O Data bit for PP-RAM/SD-RAM 119 VDDA I 2.5V
56 D14 I/O Data bit for PP-RAM/SD-RAM 120 CVBS1B I Ground for CVBS1A
57 D8 I/O Data bit for PP-RAM/SD-RAM 121 CVBS1A I Composite video for Teletext decorder
58 D6 I/O Data bit for PP-RAM/SD-RAM 122 VSSA -- GND
59 D1 I/O Data bit for PP-RAM/SD-RAM 123 VDDA I 2.5V
60 VSS33 -- GND 124 P5.0 I AFT voltage for tuner
61 VDD33 I 3.3V 125 P5.1 -- Not used
62 D13 I/O Data bit for PP-RAM/SD-RAM 126 P5.2 I AGC voltage for tuner
63 D9 I/O Data bit for PP-RAM/SD-RAM 127 P5.3 -- Not used
64 D5 I/O Data bit for PP-RAM/SD-RAM 128 TMODE I Test mode
X-ray HB LB EW correction Protection detection (Normal: H)
Pin
No.
Pin name I/O Function
75 P3.1 I/O Data for inter IC control bus
(No.YA063)1-7
SECTION 3
DISASSEMBLY
3.1 DISASSEMBLY PROCEDURE [AV-28H4BU, AV-28H4SU, AV-32H4BU, AV-32H4SU]
3.1.1 REMOVING THE REAR COVER
(1) Unplug the power cord.
(2) Remove the 13 screws [A] as shown in the Fig. 3.
(3) Withdraw the REAR COVER toward you.
3.1.2 REMOVING THE SIDE CONTROL JACK ASS'Y
• Remove the REAR COVER.
(1) Remove the 1 screw [B] as shown in the Fig.3.
(2) Slightly shift the SIDE CONTROL JACK ASS'Y to rear side
and remove the 2 claws under the SIDE CONTROL JACK
ASS'Y.
(3) Disconnect the connector [CN810F
] and [CN810K] as
shown Fig. 3.
3.1.3 REMOVING THE SIDE CONTROL PWB
• Remove the REAR COVER.
• Remove the SIDE CONTROL JACK ASSY.
(1) Remove the 2 screws [C] as shown in Fig. 3.
(2) Remove the 2 claws [D] from back side of the SIDE
CONTRL JACK ASS'Y as shown in Fig. 3.
(3) Pull out the SIDE CONTROL PWB.
3.1.4 REMOVING THE CHASSIS
• Remove the REAR COVER.
(1) Slightly raise the both sides of the chassis by hand and
remove the 2 claws under the both sides of the CHASSIS
from the front cabinet.
(2) Withdraw the CHASSIS backward.
(If necessary, take off the wire clamp, connectors etc.)
3.1.8 REMOVING THE SPEAKER
• Remove the REAR COVER.
• Remove the SPEAKER GRIL.
(1) Remove the 4 screws [K] as show in the.Fig. 1.
(2) Remove the SPEAKER.
(3) Follow the same steps when removing the other hand
SPEAKER.
3.1.9 CHECKING THE PW BOARD
• To check the back side of the PW Board.
(1) Pull out the CHASSIS. (Refer to REMOVING THE
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.
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'Y) is
connected to the CRT SOCKET PW board.
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.
3.1.5 REMOVING THE POWER & DEF. PWB
• Remove the REAR COVER.
• Remove the CHASSIS.
(1) Remove the 3 screws [E] as shown in Fig. 3.
(2) Remove the POWER & DEF. PWB upper.
(If necessary, take off the wire clamp, connectors etc.)
3.1.6 REMOVING THE AV TERMINAL BOARD
• Remove the REAR COVER.
(1) Remove the 3 screws [F] as shown in the Fig. 3.
(2) Remove the 2 claws [G] under the CHASSIS as shown in
Fig. 2.
(3) Remove the AV TERMINAL BOARD slightly in the
direction of arrow [H] as shown in Fig. 2.
3.1.7 REMOVING THE SPEAKER GRIL
• Remove the REAR COVER.
(1) Remove the 8 screws [J] as show in the.Fig. 3.
(2) Remove the SPEAKER GRIL.
AV
TERMINAL
BOARD
SPEAKER
K
H
FRONT CABINET
SPEAKER
Fig.1
AV JACK PWB
G
1-8 (No.YA063)
G
Fig.2
FRONT CABINET
CRT SOCKET PWB
FRONT CONTROL PWB
SPEAKER GRIL
CN810K
CN810F
D
B
C
SIDE CONTROL JACK ASS'Y
REAR COVER
E
POWER & DEF PWB
CLAW
CHASSIS BASE
CONTROL
BASE
C
J
MAIN PWB
CLAW
AV JACK PWB
POWER CORD
100Hz PWB
AV TERMINAL
BOARD
F
Fig.3
A
(No.YA063)1-9
3.2 DISASSEMBLY PROCEDURE [AV-28H40SU, AV-28H77SK, AV-32H40SU, AV-32H47SU, AV-32H77SK]
3.2.1 REMOVING THE REAR COVER
(1) Unplug the power cord.
(2) Remove the 13 screws [A] as shown in the Fig. 3.
(3) Withdraw the REAR COVER toward you.
3.2.8 CHECKING THE PW BOARD
• To check the back side of the PW Board.
(1) Pull out the CHASSIS. (Refer to REMOVING THE
CHASSIS).
(2) Erect the CHASSIS vertically so that you can easily check
3.2.2 REMOVING THE SIDE CONTROL JACK ASS’Y
• Remove the REAR COVER.
(1) Remove the 1 screw [B] as shown in the Fig.3.
(2) While slightly raise the SIDE CONTROL JACK ASSY,
remove the 2 claws under the SIDE CONTROL JACK
ASSY.
(3) Disconnect the connector [F] and [K] as shown in Fig. 1.
3.2.3 REMOVING THE SIDE CONTROL PWB
• Remove the REAR COVER.
• Remove the SIDE CONTROL JACK ASSY.
(1) Remove the 3 claws [C] from back side of the SIDE
CONTROL JACK ASSY as shown in Fig. 1.
(2) Pull out the SIDE CONTROL PWB.
3.2.4 REMOVING THE CHASSIS
the back side of the PW Board.
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’Y) is
connected to the CRT SOCKET PW board.
3.2.9 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.
• Remove the REAR COVER.
(1) Slightly raise the both sides of the chassis by hand and
remove the 2 claws under the both sides of the CHASSIS
from the front cabinet.
(2) Withdraw the CHASSIS backward.
(If necessary, take off the wire clamp, connectors etc.)
C
3.2.5 REMOVING THE POWER & DEF. PWB
• Remove the REAR COVER.
• Remove the CHASSIS.
(1) Remove the 3 screws [D] as shown in Fig. 3.
(2) Remove the POWER & DEF. PWB upper.
(If necessary, take off the wire clamp, connectors etc.)
3.2.6 REMOVING THE SIDE SPEAKER
• Remove the REAR COVER.
(1) Remove the 2 screws [E], and remove the SPEAKER
ADAPTER as shown in Fig. 3.
NOTE :
When removing the 2 screws [E] of the speaker holder
remove the lower side screw first, and then remove the
upper one.
(2) Remove the 4 screws [F] attaching the SPEAKER.
(3) Follow the same steps when removing the other hand
SPEAKER.
3.2.7 REMOVING THE AV TERMINAL BOARD
• Remove the REAR COVER.
(1) Remove the 3 screws [G] as shown in the Fig. 3.
(2) Remove the 2 claws [H] under the CHASSIS as shown in
Fig. 2.
(3) Remove the AV TERMINAL BOARD slightly in the
direction of arrow [I] as shown in Fig. 2.
F
K
AV
TERMINAL
BOARD
SIDE
CONTROL
PWB
C
(Back view)
Fig.1
AV JACK PWB
I
H
H
1-10 (No.YA063)
Fig.2
FRONT CABINET
E
( x 2)
F
( x 4)
SIDE CONTROL JACK
ASS'Y
REAR COVER
CRT SOCKET
PWB
FRONT
CONTROL
PWB
MAIN PWB
CLAW
B
SPEAKER
ADAPTER
D
( x 3)
AV SW PWB
CLAW
SPEAKER
POWER & DEF. PWB
CHASSIS BASE
AV TERMINAL
BOARD
MICOM
PWB
G
( x 3)
POWER CORD
A
( x 13)
Fig.3
(No.YA063)1-11
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