a SPECIFICATIONS ....................................................................................................................................2
a SAFETY PRECAUTIONS ........................................................................................................................3
a FEATURES ..............................................................................................................................................4
a FUNCTIONS .............................................................................................................................................5
a SPECIFIC SERVICE INSTRUCTIONS ....................................................................................................6
a SERVICE ADJUSTMENTS ....................................................................................................................11
¤ STANDARD CIRCUIT DIAGRAM (APPENDIX) .................................................................................. 2-1
a PARTS LIST ...........................................................................................................................................29
Design & specifications are subject to change without notice.
2No. 51786
GOOD
EARTH
GROUND
0.15 µF AC-TYPE
AC VOLTMETER
(HAVING 1000Ø/V,
OR MORE SENSITIVITY)
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
1500Ø 10W
A V
This mark shows a fast
POWER CORD
REPLACEMENT WARNING
Connecting thr white line side of
power cord to “WHT” character side.
operating fuse, the
letters indicated below
show the rating.
PWB
WHT
PW
White line side
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 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. Use isolation transformer when hot chassis.
The chassis and any sub-chassis contained in some products are
connected to one side of the AC power line. An isolation transformer
of adequate capacity should be inserted between the product and
the AC power supply point while performing any service on some
products when the HOT chassis is exposed.
5. Don't short between the LIVE side ground and ISOLATED (NEU-
TRAL) side ground or EARTH side ground when repairing.
Some model's power circuit is partly different in the GND. The 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, cracked or
melted high voltage harness, poor soldering, etc.). To maintain the
proper minimum level of soft X-Ray emission, components in the
high voltage circuitry including the picture tube must be the exact
replacements or alternatives approved by the manufacturer of the
complete product.
8. Do not check high voltage by drawing an arc. Use a high voltage
meter or a high voltage probe with a VTVM. Discharge the picture
tube before attempting meter connection, by connecting a clip lead
to the ground frame and connecting the other end of the lead through
a 10kØ 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.
No. 517863
AV-27F702
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 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 1000 ohms per volt or more sensitivity in the following manner.
Connect a 1500Ø 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.).
11 . High voltage hold down circuit check.
After repair of the high voltage hold down circuit, this circuit shall be
checked to operate correctly.
See item “How to check the high voltage hold down circuit”.
AV-27F702
FEATURES
Full-flat CRT (cathode ray tube) reproduces fine textured picture in
•
every detail.
I2C bus control utilizes single chip ICs.
•
Built-in HYPER-SURROUND system.
•
Built-in BBE.
•
3 LINE DIGITAL COMB FILTER circuit improved picture quality.
•
Component input terminal for talking best advantage of Component
•
Video Signal.
a SYSTEM BLOCK DIAGRAM
IC702
E2PROM 4k bit
SCL 1SDA 1
Audio Video input terminal. (S-input ×2, V-input ×3)
•
Variable/Fix audio output terminal.
•
Closed-caption broadcasts can be viewed.
•
With AV COMPU LINK EX terminal.
•
Remote
control
unit
SCL 0SDA 0
IC701
MAIN MICON
IC101
1 CHIP
CONTROL
AFC
IC501
AVSW
CONTROL
TU001
TUNER
IC001
MTS, TONE
SURROUND CONTROL
4No. 51786
FUNCTIONS
a FRONT PANEL
AV-27F702
a FRONT PANEL DOOR OPENED
a REAR PANEL
a REMOTE CONTROL UNIT
(RM-C303G-1A)
2
No. 517865
AV-27F702
SPECIFIC SERVICE INSTRUCTIONS
DISASSEMBLY PROCEDURE
REMOVING THE REAR COVER
1. Unplug the power supply cord.
2. Remove the 12 screws marked A as shown in Fig.1.
3. Withdraw the REAR COVER toward you.
[CAUTION]
When reinstalling the rear cover, carefully push it inward after in-
•
serting the MAIN PWB into the rear cover groove.
REMOVING THE CHASSIS
After removing the rear cover.
•
1. Slightly raise the both sides of the chassis by hand and remove the
3 claws marked B under the chassis from the front cabinet as
shown in Fig.1.
2. Withdraw the chassis backward along the rail in the arrow direction
marked C as shown in Fig.1.
(If necessary, take off the wire clamp, connector’s etc.)
When conducting a check with power supplied, be sure to confirm
*
that the CRT earth wire is connected to the CRT SOCKET PWB
and the MAIN PWB.
REMOVING THE TERMINAL BOARD
After removing the rear cover.
•
1. Remove the 6 screws marked D as shown in Fig.1.
2. When you pull out the TERMINAL BOARD in the direction of arrow
marked E as shown in Fig.1, it can be removed.
REMOVING THE DAF PW BOARD
After removing the rear cover and chassis.
•
1. Lift the right side of the DAF PWB while pressing the PWB stopper
marked J and claw marked K in the arrow direction marked L as
shown in Fig.1.
2. Then remove the DAF PWB.
(If necessary, take off the wire, connector’s etc.)
REMOVING THE SPEAKER
After removing the rear cover.
•
1. Remove the 4 screws marked M as shown in Fig.1.
2. Withdraw the speaker backward.
3. Follow the same steps when removing the other hand speaker.
CHECKING THE MAIN PW BOARD
1. To check the back side of the MAIN PW Board.
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 MAIN PW Board.
[CAUTION]
When erecting the chassis, be careful so that there will be no con-
•
tacting with other PW Board.
Before turning on power, make sure that the CRT earth wire and
•
other connectors are properly connected.
REMOVING THE FRONT AND POWER SW PW BOARDS
After removing the rear cover and chassis.
•
1. Remove the 4 screws marked F as shown in Fig.1.
2. Then remove the FRONT PWB and POWER SW PWB.
(If necessary, take off the wire, connector’s etc.)
REMOVING THE LF PW BOARD
After removing the rear cover and chassis.
•
1. Lift the left side of the LF PWB while pressing the 2 PWB stoppers
marked G in the arrow direction marked H as shown in Fig.1.
2. Then remove the LF PWB.
(If necessary, take off the wire, connector’s etc.)
WIRE CLAMPING AND CABLE TYING
1. Be sure 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.
6No. 51786
FRONT CABINET
AV-27F702
SPEAKER
M
(x4)
CRT SOCKET PWB
REAR COVER
POWER SW PWB
CLAW
B
PWB
STOPPER
G
FRONT PWB
H
LF PWB
F
(x4)
CLAW
PWB
G
STOPPER
CLAW
K
DAF PWB
L
B
C
PWB STOPPER
J
CHASSIS
MAIN PWB
E
D
(x6)
A
(x12)
Fig.1
No. 517867
AV-27F702
MEMORY IC REPLACEMENT
1. Memory IC
This model use 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
ProcedureScreen 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 SLEEP 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 the setting items.
Where these differ, select the setting item with the MENU UP/DOWN
key and adjust the setting with the MENU LEFT/RIGHT keys. (The
letters of the selected item are displayed in yellow.)
5) After adjusting, release the MENU LEFT/RIGHT key to store the
setting 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
PICTURESOUND
THEATEROTHERS
LOW LIGHTHIGH LIGHT
RF AFC
VCO(CW)I2C BUS CTRL
SELECTBY
OPERATE BY
Fig.1
SYSTEM CONSTANT
MODEL:99–
TM CORR.: NO
CCD: YES
V-CHIP: YES
CAN V-CHIP: NO
EXIT BY
99999
999999999 999
SELECTBY
OPERATE BY
Fig.2
EXIT BY
EX
IT
EX
IT
(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.
TINTCENTER
COLORCENTER
PICTURECENTER
BRIGHTCENTER
DETAILCENTER
NOISE MUTINGON
SET VIDEO STATUSALL CENTER
NO
YES
YES
NO
SOUND ADJUST
BASSCENTER
TREBLECENTER
BALANCECENTER
MTSSTEREO
CLOCK/TIMERS
SET CLOCKUnnecessary to set
ON/OFF TIMERNO
INITIAL SETUP
TV SPEAKERON
AUDIO OUTFIX
COMPONENT-INNO
LANGUAGEENG
CLOSED CAPTIONOFF
AUTO TUNER SETUPUnnecessary to set
CHANNEL SUMMARYUnnecessary to set
V-CHIPOFF
SET LOCK CODEUnnecessary to set
No. 517869
AV-27F702
REPLACEMENT OF CHIP COMPONENT
CAUTIONS
a
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
a
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
a
1. How to remove Chip parts
Resistors, capacitors, etc.
(1) As shown in the figure, push the part with tweezers and alter-
nately 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 alter-
nately 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.
(3) First solder lead A as indicated in the figure.
A
B
C
(4) Then solder leads B and C.
A
Note : After removing the part, remove remaining solder from the
pattern.
10No. 51786
B
C
AV-27F702
SERVICE ADJUSTMENTS
ADJUSTMENT PREPARATION:
1. You can make the necessary adjustments for this unit with either the remote control unit or with the adjustment equipment 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 the power for the 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, transformers, capacitors, etc.
7. Presetting before adjustment.
Unless otherwise specified in the adjustment instructions, preset the following functions with the remote control unit.
User mode setting position
•
VIDEO STATUSSTANDARD
HYPER SURROUNDOFF
BASS, TREBLE, BALANCECENTER
TINT, COLOR, PICTURE,
BRIGHT, DETAIL
CENTER
MEASURING INSTRUMENT
1. DC voltmeter(or digital voltmeter)
2. Oscilloscope
3. Signal generator ( Pattern generator ) [NTSC]
4. Remote control unit
5. TV audio multiplex signal generator
6. Frequency counter
7. Resistor (1MØ)
ADJUSTMENT ITEMS
Check of B1 POWER SUPPLY
•
RF AGC adjustment
•
FOCUS adjustment
•
WHITE BALANCE adjustment
•
WHITE BALANCE (Low Light) adjustment
WHITE BALANCE (High Light) adjustment
BRIGHT adjustment
•
SUB BRIGHT adjustment
CONTRAST adjustment
•
SUB CONTRAST adjustment
DEFLECTION adjustment
•
V.CENTER and TRAPEZIUM adjustment
V-SIZE and V-LINEARITY adjustment
H SIZE and H POSITION adjustment
SIDE PIN and CORNER PIN adjustment
Operate the SERVICE MENU with the REMOTE CONTROL UNIT.
2. SERVICE MENU ITEMS
In general, basic setting (adjustments) items or verifications are performed in the SERVICE MENU.
PICTURE ............................... This sets the setting values (adjustment values) of the VIDEO/CHROMA and DEFLECTION circuits.
•
SOUND .................................. This sets the setting values (adjustment values) of the AUDIO circuit.
•
THEATER .............................. This is used when the THEATER MODE is adjusted.
•
OTHERS ................................ This is used when the OTHERS MODE is adjustment.
•
LOW LIGHT ........................... This sets the setting values (adjustment values) of the WHITE BALANCE circuit.
•
HIGH LIGHT .......................... This sets the setting values (adjustment values) of the WHITE BALANCE circuit.
•
RF AFC .................................. This is used when the RF AFC MODE is verified. [Do not adjust]
•
VCO (CW) .............................. This is not used for service.
•
I2C BUS CTRL ...................... This is used when ON/OFF of the I2C BUS CTRL is set. [Fixed ON]
•
3. Basic Operations of the SERVICE MENU
(1) How to enter the SERVICE MENU.
Press SLEEP 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 to enter the SERVICE MENU screen 1 shown in the next figure page.
AV-27F702
(2) SERVICE MENU screen selection
Press the UP / DOWN key of the MENU to select any of the following items.
(The letters of the selected items are displayed in yellow.)
PICTURE
•
THEATER
•
LOW LIGHT
•
RF AFC
•
VCO(CW)
•
(3) Enter the any setting ( adjustment ) mode
PICTURE, SOUND and OTHERS mode
•
1) If select any of PICTURE, SOUND or OTHERS items, and the LEFT / RIGHT key is pressed from SERVICE MENU ( MAIN MENU ), 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 or the OTHER mode screen 5 is
displayed, and the PICTURE, SOUND or OTHERS setting can be performed.
THEATER, LOW LIGHT, HIGH LIGHT, RF AFC, VCO(CW) and I2C BUS CTRL mode
•
1) If select any of THEATER / LOW LIGHT / HIGH LIGHT / RF AFC / VCO (CW) / I2C BUS CTRL items, and the LEFT / RIGHT key is pressed
from SERVICE MENU ( MAIN MENU ), the screens 6 7 8 9 10 11 will be displayed as shown in figure page later.
2) Then the settings or verifications can be performed.
SOUND
•
OTHERS
•
HIGH LIGHT
•
I2C BUS CTRL
•
No. 5178613
AV-27F702
1
SERVICE MENU (MAIN MENU)SCREENPICTURE MODE
SERVICE MENU
PICTURESOUND
THEATEROTHERS
LOW LIGHTHIGH LIGHT
RF AFC
VCO(CW)I2C BUS CTRL
SELECTBY
OPERATE BY
9
RF AFC MODE
EXIT BY
EX
IT
SELECTBY
1. NOISE DET.
STAT US
[DO NOT ADJUST]
2
EX
EXIT BY
IT
4
SOUND MODEOTHERS MODE
999
99999999
6
THEATER MODE (1/2)THEATER MODE (2/2)
3
1. BRIGHT
STAT US
5
1. OSD POS.
999
99999999
999
TOO HIGHGOODTOO LOW
RF AFCON
FINE
SELECTBY
OPERATE BY
10
VCO (CW) MODE
EXIT BY
999
EX
[DO NOT USE]
HIGH LEVEL
REFERENCE LEVEL
LOW LEVEL
SYNC: YES
11
I2C BUS CTRL MODE
[FIXED ON]
TINT
COLOR
PICTURE
BRIGHT
DETAIL
R CUT.
G CUT.
SELECTBY
IT
OPERATE BY
BRIGHT
999
999
999
999
999
999
999
7
LOW LIGHT MODE
999
999999
8
HIGH LIGHT MODE
B CUT.
R DRIVE
B DRIVE
DC REST.
BLK ST.
GMM PNT
EXIT BY
999
999
999
999
999
999
PAGE 1/2
EX
IT
999
CD MAT.
RY GAIN
GY PHASE
CORING
SELECTBY
OPERATE BY
99
99
99
99
CMP CD M
CMP RY G
CMP GY P
CMP COR
EXIT BY
99
99
99
99
PAGE 2/2
EX
IT
I2C BUSON
SELECTBY
OPERATE BY
EXIT BY
EX
IT
HIGH LIGHT
999999
14No. 51786
(4) Setting method
1. BRIGHT
STATUS
999
99999999
SETTING ITEM
INITIAL
SETTING VALUE
(Adjust)
SETTING VALUE
PICTURE MODE
1) UP / DOWN key of the MENU
Select the SETTING ITEM.
2) LEFT / RIGHT key of the MENU
Setting (adjust) the SETTING VALUE of the SETTING ITEM.
When the key is released the SETTING VALUE will be stored (memorized).
3) EXIT key
Returns 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.
AV-27F702
¤ The settings for LOW LIGHT and HIGH LIGHT are described in the WHITE BAL-
ANCE page of ADJUSTMENT.
No. 5178615
AV-27F702
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 (Adjustment) items not listed in “ADJUSTMENT”.
PICTURE MODE
•
The four setting items in the video mode No.6 EXT BRI., No.7 EXT PIC., No.8 EXT COL. and No.9 EXT TINT are linked to the items in the TV
MODE No.1 BRIGHT, No.2 PICTURE, No.3 COLOR and No.4 TINT, respectively. When the setting items in the TV mode are adjusted, the
values in the setting items in the video mode are revised automatically to the same values in the TV mode.(The initial setting values given in ( )
are off-set values.)
When the four items (No.6, 7, 8 and 9) are adjusted in the video mode, the setting values in each item are revised independently.
No.Setting (Adjustment) itemVariable rangeInitial setting value
1BRIGHT000 — 127063
2PICTURE000 — 127070
3COLOR000 — 127072
4TINT000 — 127056
5TV DETAIL000 — 063050
6EXT BRIGHT±025±000
7EXT PICT.±025+002
8EXT COLOR±025±000
9EXT TINT±025–016
10EXT DETAIL000 — 063050
11CMP BRIGHT±025–004
12CMP PICT.±025–008
13CMP COLOR000 — 127078
14CMP TINT000 — 127072
15CMP DETAIL000 — 063050
16CMP R CUT±025–011
17CMP G CUT±025±000
18CMP B CUT±025–001
19CMP R DRV±025±000
20CMP B DRV±025±000
21WPL000 / 001001
22B. B. SW000 / 001000
23C TRAP000 / 001000
24CORING000 / 001000
25CMP CORING000 / 001001
26TV SHARPF000 / 001001
27EXT SHARPF000 / 001001
28CMP SHARPF000 / 001001
29RGB CONT000 — 063031
30TV ID SEN S000 / 001000
31EXT ID SEN000 / 001000
32F ID000 / 001000
33Y MUTE000 / 001000
34AUDIO ATT000 — 127127
35SUB CONT000 — 015008
16No. 51786
AV-27F702
No.Setting (Adjustment) itemVariable rangeInitial setting value
36R Y GAIN000 / 001001
37CMP R Y GA000 / 001001
38G Y PHASE000 / 001000
39CMP G Y PH000 / 001000
40CD MATRIX000 — 003003
41CMP CD MAT000 — 003002
42BLACK ST000 — 003001
43DC REST000 — 003001
44COLOR GMM000 / 001000
45UV/CBCR000 / 001001
46AT FLESH000 / 001000
47ABL GAIN000 — 003000
48ABL ST PNT000 — 003003
49RGB ABCL000 / 001001
50TV BPF / TOF000 / 001000
51EXT BPF / TOF000 / 001000
52GMM PNT000 — 003003
53SVM GAIN000 — 003002
54CMP SVM GA000 — 003002
55SVM PHASE000 / 001000
56AUDIO SW000 / 001000
57BUZZ000 / 001000
58IF FREQ000 / 001000
59RF AGC000 — 063045
60AFT MUTE000 / 001000
61AFT SENS000 / 001001
62R/G DRV SW000 / 001001
63BLK SW000 / 001000
64V S COR000 — 015012
65V LIN000 — 015008
66V SIZE000 — 127065
67V AGC000 / 001000
68V CENTER000 — 063053
69TV AFC000 — 003000
70EXT AFC000 — 003002
71V POSI000 — 007000
72H POSI000 — 031011
73H SIZE000 — 063023
74TV V FREQ000 — 003000
75EXT V FREQ000 — 003003
76SIDE PIN000 — 063027
77STAND BY000 / 001000
78TRAPEZ000 — 063035
79V RAMP REF000 / 001001
80V 48HZ000 / 001000
81V EHT000 — 007000
82TOP PIN000 — 031010
No. 5178617
AV-27F702
No.Setting (Adjustment) itemVariable rangeInitial setting value
83H EHT000 — 007000
84BTM PIN000 — 031012
85V BLK LOW000 — 003000
86V BLK UP000 — 003000
87CAPTION IN000 / 001000
88H BLK000 / 001000
89SCREEN000 / 001000
90ACB SW000 / 001000
91ACB PULSE000 — 015007
92OVER MODU000 / 001001
93CB/CR FIL000 / 001001
94TEST000 — 255128
95RF S/N TY000 — 002002
96EXT S/N TY000 — 002002
97RF SN YC E000 — 255005
98RF SN YC F000 — 255016
99RF SN YC G000 — 063032
100RF SN YC H000 — 255025
101EX SN YC E000 — 255005
102EX SN YC F000 — 255016
103EX SN YC G000 — 063032
104EX SN YC H000 — 255025
105RF SN VC 1000 — 063000
106RF SN VC 2000 — 063007
107RF SN VC 3000 — 063014
108RF SN VC 4000 — 063021
109EX SN VC 1000 — 063000
110EX SN VC 2000 — 063007
111EX SN VC 3000 — 063014
112EX SN VC 4000 — 063021
113COR LEVEL000 — 003003
114VNR CHK000 — 255003
115YC SN TIME000 — 255005
116VC SN TIME000 — 255005
117VM DATA A±127+008
118VM DATA B±127–004
119VM DATA C±127–016
120VM DATA D000 / 001001
121VC SN STOP000 — 255010
18No. 51786
SOUND MODE
•
No.Setting (Adjustment) itemVariable rangeInitial setting value
1NOISE DET.000 / 001001
2IN LEVEL000 — 063025
3FH MONITOR000 / 001000
4STEREO VCO000 — 063030
5PILOT CAN.000 / 001000
6FILTER000 — 063030
7LOW SEP.000 — 063028
8HI SEP.000 — 063025
95FH MON.000 / 001000
10SAP VCO000 — 063003
11IN GAIN000 / 001000
12FIL. OFFSET000 — 010000
13BBE BASS±015+001
14BBE TRE±015–001
THEATER MODE
•
Setting (Adjustment) itemVariable rangeInitial setting value
AV-27F702
TINT±20–06
COLOR±20–03
PICTURE±50–15
BRIGHT±20±00
DETAIL±20+03
R CUT.±20±00
G CUT.±20±00
B CUT.±20±00
R DRIVE±99+07
B DRIVE±99–25
DC REST.00 — 0301
BLK ST.00 — 0300
GMM PNT00 — 0301
CD MATRIX00 — 0301
RY GAIN00 / 0101
GY PHASE00 / 0100
CORING00 / 0101
CMP CD M00 — 0301
CMP RY G00 / 0101
CMP GY P00 / 0100
CMP COR00 / 0101
OTHERS MODE
•
No.Setting (Adjustment) itemVariable rangeInitial setting value
1OSD POS.000 — 007002
2CCD POS.000 — 015003
3EOSEL000 / 001000
4MENU COLOR000 — –030–010
5MENU PICT.000 — –030–010
6MENU BRI.000 — –030–010
No. 5178619
AV-27F702
LOW LIGHT MODE
•
Setting (Adjustment) itemVariable rangeInitial setting value
R CUTOFF0 — 25585
G CUTOFF0 — 25585
B CUTOFF0 — 25585
HIGH LIGHT MODE
•
Setting (Adjustment) itemVariable rangeInitial setting value
R DRIVE0 — 12760
B DRIVE0 — 12760
RF AFC MODE
•
Setting (Adjustment) itemVariable rangeInitial setting value
RF AFCON / OFFON
FINE-77 — +77± ××
I2C BUS CTRL MODE
•
Setting (Adjustment) itemVariable rangeInitial setting value
I2C BUSON/OFF[FIXED ON]
DO NOT
ADJUST
DO NOT
ADJUST
20No. 51786
ADJUSTMENTS
B1 POWER SUPPLY
Item
Measuring
instrument
AV-27F702
Test pointAdjustment partDescription
Check of
B1 POWER
SUPPLY
DC Voltmeter R507 C504
ADJUSTMENT OF RF AGC
Item
RF AGC
adjustment
Measuring
instrument
1. Receive a black-and-white signal.
side (B1)
Q511
heatsink ( )
Test pointAdjustment partDescription
No.59 RF AGC
2. Connect the DC Voltmeter to R507 C504 side (B1) and Q511 heatsink
( ).
3. Confirm that the voltage is DC134V .
1. Receive a broadcast.
2. Select the No.59 RF AGC of the PICTURE MODE.
3. Press the MUTE key of the remote control unit and turn off color.
4. With the LEFT key of the remote control unit, get noise in the screen
picture. (0 side of setting value)
5. Press the RIGHT key of the remote control unit and stop when noise
disappears from the screen.
6. Change to other channels and make sure that there Is no irregularity.
7. Press the MUTE key and get color out.
+2V
-2V
ADJUSTMENT OF FOCUS
Item
FOCUS
adjustment
Measuring
instrument
Signal
generator
Test pointAdjustment partDescription
FOCUS VR
[In HVT]
H VR
[In HVT]
Notes:
• Proceed to the following this adjustment after having completed the
adjustments of B1 POWER SUPPLY, SUB BRIGHT and PICTURE.
• Set VIDEO STATUS to “STANDARD”.
1. Receive a crosshatch signal.
2. While looking at the screen center, adjust the FOCUS VR so that
the horizontal lines will be clear and in fine detail.
3. Adjust the H VR so that the vertical lines will be clear and in fine
detail.
4. Make sure that the picture is in focus even when the screen gets
darkened.
Note:
The final adjustment of convergence must be done after the FOCUS
adjustment. (Convergence is changed by FOCUS adjustment.)
No. 5178621
AV-27F702
ADJUSTMENT OF WHITE BALANCE
Item
Measuring
instrument
Test pointAdjustment part
Description
WHITE
BALANCE
(Low Light)
Adjustment
Signal
generator
[LOW LIGHT] MODE
BRIGHT
999
R CUTOFF
REMOTE CONTROL UNIT
H.LINE ON
999
999999
G CUTOFF
H.LINE OFFEXIT
123
R CUTOFFG CUTOFFB CUTOFF
456
R CUTOFFG CUTOFFB CUTOFF
789
No.1 BRIGHT
R CUTOFF
G CUTOFF
B CUTOFF
SCREEN VR
[In HVT]
BRIGHT
B CUTOFF
Note :
Set VIDEO STATUS to “STANDARD”.
1. Receive a black-and-white signal.(Color off)
2. Select the [LOW LIGHT] MODE from the SERVICE MENU.
3. Set the initial setting value of BRIGHT is 063 with the LEFT / RIGHT
key of the remote control unit.
4. Set the initial setting value of R CUTOFF, G CUTOFF and B CUTOFF is 085 with the 4 to 9 key of the remote control unit.
5. Display a single horizontal line by pressing the 1 key of the remote
control unit.
6. Turn the screen VR 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 4 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.
9 The 3 EXIT key is the cancel key for the WHITE BALANCE.
WHITE
BALANCE
(High Light)
Adjustment
Signal
generator
[HIGH LIGHT] MODE
999
R DRIVE
H.LINE ON
HIGHT LIGHT
REMOTE CONTROL UNIT
H.LINE OFFEXIT
999
123
R DRIVEB DRIVE
456
R DRIVEB DRIVE
789
R DRIVE
B DRIVE
B DRIVE
Notes:
• Proceed to the following this adjustment after having completed the
adjustment of LOW LIGHT WHITE BALANCE.
• Set VIDEO STATUS to “STANDARD”.
1. Receive a black-and-white signal. (Color off)
2. Select the [HIGH LIGHT] MODE from the SERVICE MENU.
3. Set the initial setting value of R DRIVE and B DRIVE is 060 with the
4 , 6 , 7 and 9 keys of the remote control unit.
4. Adjust the screen until it becomes white using the 4 , 6 , 7 and 9
keys of the remote control unit.
9 The 3 (EXIT) key is the cancel key for the WHITE BALANCE.
22No. 51786
ADJUSTMENT OF BRIGHT
Item
Measuring
instrument
AV-27F702
Test pointAdjustment partDescription
SUB BRIGHT
Adjustment
ADJUSTMENT OF CONTRAST
Item
SUB
CONTRAST
Adjustment
Measuring
instrument
Test pointAdjustment partDescription
No.1 BRIGHTNotes:
• Proceed to the following this adjustment after having completed the
adjustments of LOW LIGHT WHITE BALANCE and HIGH LIGHT
WHITE BALANCE.
• Set VIDEO STATUS to “STANDARD”.
1. Receive a broadcast.
2. Select the 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 remote control unit.
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.
No.2 PICTURE
Notes:
• Proceed to the following this adjustment after having completed the
adjustment of SUB BRIGHT.
• Set VIDEO STATUS to “STANDARD”.
ADJUSTMENT OF DEFLECTION
Item
V CENTER and
TRAPEZIUM
Adjustment
Measuring
instrument
Signal
generator
Test pointAdjustment partDescription
No.68 V CENTER
No.78 TRAPEZ
1. Receive a broadcast.
2. Select the No.2 PICTURE of the PICTURE MODE.
3. Set the initial setting value of the No.2 PICTURE with the LEFT /
RIGHT key of the remote control unit.
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.
Note:
Proceed to the following this adjustment after having completed the
adjustments of SUB BRIGHT and SUB CONTRAST.
1. Receive a crosshatch signal.
2. Adjust the No.68 V CENTER of the PICTURE MODE to be the same
between the CRT vertical center and crosshatch vertical center.
3. Adjust the No.78 TRAPEZ of the PICTUER MODE to be the vertical
lines straight.
4. Confirm the vertical lines to be straight. If it is not straight, adjust to
be straight at the No.78 TRAPEZ.
No. 5178623
AV-27F702
Item
V-SIZE and
V-LINEARITY
Adjustment
Screen
size 92%
H SIZE and
H POSITION
Adjustment
Screen
size
Measuring
instrument
Signal
generator
Signal
generator
Test pointAdjustment partDescription
Screen size
Picture size 100%
Screen size 90%
No.66 V SIZE
No.65 V LIN
Picture
size 100%
No.73 H SIZE
No.72 H POSI
Picture
size 100%
Note:
Proceed to the following this adjustment after having completed the
adjustments of SUB BRIGHT and SUB CONTRAST.
1. Receive a crosshatch signal.
2. Select the No.66 V SIZE of the PICTURE MODE to squeeze the
laster.
3. Adjust the No.65 V LIN of the PICTURE MODE to be symmetrical.
4. Adjust the No.66 V SIZE until the vertical screen size is 92%.
Note:
Proceed to the following this adjustment after having completed the
adjustments of FOCUS, SUB BRIGHT, SUB CONTRAST, V CENTER,
TRAPEZIUM, V-SIZE and V-LINEARITY.
1. Receive a crosshatch signal.
2. Select the No.73 H SIZE of the PICTURE MODE.
3. Set the initial setting value of the No.73 H SIZE with the LEFT /
RIGHT key of the remote control unit.
4. Adjust the No.73 H SIZE until the horizontal screen size is 90%.
5. Adjust the No.72 H POSI until the screen will be horizontally centered.
Picture size 100%
SIDE PIN and
CORNER PIN
Adjsutment
Signal
generator
StraightStraight
No.76 SIDE PIN
No.82 TOP PIN
No.84 BTM PIN
Note:
Proceed to the following this adjustment after having completed the
adjustments of FOCUS, SUB BRIGHT, SUB CONTRAST, V CENTER,
TRAPEZIUM, V-SIZE and V-LINEARITY.
1. Receive a crosshatch signal.
2. Adjust such that vertical 2nd lines from left and right to be straight at
3. Adjust the end of vertical 2nd lines from left and right to be straight
24No. 51786
the No.76 SIDE PIN of the PICTURE MODE.
at the No.82 TOP PIN and the No.84 BTM PIN of the PICTURE
MODE.
ADJUSTMENT OF CHROMA
Item
Measuring
instrument
AV-27F702
Test pointAdjustment partDescription
SUB COLOR
adjustment
Signal
generator
Oscilloscope
Remote
control unit
Y
Cy
W
TP-B
TP-E1(
[CRT SOCKET
PWB]
G
R
Mg
No.3 COLOR
)
Notes:
• Proceed to the following this adjustment after having completed the
adjustment of CONTRAST.
• Set VIDEO STATUS to “STANDARD”.
[ Method of adjustment without measuring instrument ]
1. Receive a broadcast.
2. Select the 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 remote control unit.
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.
(A)
(–)
0V
B
(+)
Notes:
• Proceed to the following this adjustment after having completed the
adjustment of CONTRAST.
• Set VIDEO STATUS to “STANDARD”.
[ Method of adjustment using measuring instrument ]
1. Input the full field color bar signal (75% white).
2. Select the 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 remote control unit.
4. Connect the oscilloscope between TP-B and TP-E1.
5. Adjust COLOR and bring the value of (A) in the illustration to the
voltage +6V (V
W-B).
SUB TINT
adjustment
Signal
generator
Oscilloscope
Remote
control unit
Y
Cy
W
TP-B
TP-E1( )
[CRT SOCKET
PWB]
G
R
Mg
No.4 TINT
Notes:
• Proceed to the following this adjustment after having completed the
adjustment of CONTRAST.
• Set VIDEO STATUS to “STANDARD”.
[ Method of adjustment without measuring instrument ]
1. Receive a broadcast.
2. Select the 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 remote control unit.
4. If the tint is not the best with the initial setting value, make fine ad-
justment of the No.4 TINT until you get the optimum tint.
(–)
0V
(+)
B
(B)
Notes:
• Proceed to the following this adjustment after having completed the
adjustment of CONTRAST.
• Set VIDEO STATUS to “STANDARD”.
[ Method of adjustment using measuring instrument ]
1. Input the full field color bar signal (75% white).
2. Select the No.4 TINT of the PICTURE MODE.
3. Set the initial setting value of the No.4 TINT with the LEFT/RIGHT
key to the remote control unit.
4. Connect the oscilloscope between TP-B and TP-E1.
5. Adjust TINT and bring the value of (B) in the illustration to the volt-
2. Verify that the No.6 FILTER is set at its initial setting value.
Note: Menu “MTS” is set to “STEREO”
1. Input a stereo L signal (300Hz) from the TV audio multiplex signal
2. Connect an oscilloscope to pin 1 of [MPX] connector, and display
3. Change the connection of the oscilloscope to pin 2 of [MPX] con-
4. Select the No.7 LOW SEP. of the SOUND MODE.
5. Set the initial setting value of the No.7 LOW SEP. with the LEFT/
6. Adjust the No.7 LOW SEP. so that the 300Hz signal level will be-
7. Change the signal to 3kHz, and connect an oscilloscope to pin 1 of
8. Adjust the No.8 HI SEP. so that the 3kHz signal level will become
26No. 51786
generator to the antenna terminal.
one cycle portion of the 300Hz signal.
nector, and enlarge the voltage axis.
RIGHT key of the remote control unit.
come minimum.
[MPX] connector.
minimum.
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 SW ON.
S1
(2) As shown in Fig. 1, set the resistor (between
(3) Make sure that the screen picture disappears.
(4) Temporarily unplug the power cord.
(5) Remove the resistor (between S1 connector 2 & 3 ).
(6) Again plug the power cord, make sure that the normal picture is displayed on the screen.
RY951
connector 2 & 3 ).
RESISTOR
20.3 kΩ± 101 Ω 1/4 W
AV-27F702
POWER
ON OFF
R952
R532
D535
R951
R533
Q531
Q951
Q532
R534
+
C533
D534
D532
BW
D531
Fig. 1
23
R537FR525
R535R538
S1 CONNECTOR
+
HEATER
T502
4
D525
C525
No. 5178627
AV-27F702
SELF CHECK FUNCTIONS
1. Outline
This model has self check functions given below. When a malfunction has been detected, the 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 itemDetails of detectionMethod of detectionState of malfunction
Over-current protector
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.
Operation of B1 protector circuit.The microcomputer detects at 1
second intervals.
If NG is detected for more than
200 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
28No. 51786
JVC SERVICE & ENGINEERING COMPANY OF AMERICA
DIVISION OF JVC AMERICAS CORP.
Head office :
East Coast :
Midwest:
West Coast :5665 Corporate Avenue, Cypress, California 90630(714)229-8011
Southwest :10700 Hammerly, Suite 105, Houston, Texas 77043(713)935-9331
Hawaii:2969 Mapunapuna Place, Honolulu, Hawaii 96819(808)833-5828
Southeast :1500 Lakes Parkway, Lawrenceville, Georgia 30243(770)339-2582
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 60504
(630)851-7855
JVC CANADA INC.
Head office :21 Finchdene Square Scarborough, Ontario M1X 1A7(416)293-1311
Vancouver :13040 Worster Court Richmond B.C. V6V 2B3(604)270-1311
27F702S-UCM #4
Printed in Japan
VP0101
SW
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