JVC AV-35750 User manual

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SAFETY
PRECAUTIONS
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FEATURES:
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OPERATING
INSTRUCTIONS
[AV-35750]
(APPENDED)
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1-1~1-16
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OPERATING
INSTRUCTIONS
[AV-35770]
(APPENDED)
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1-16
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DIFFERENCE
LIST
OF
MAIN
PARTS...
2.26.2
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5
MB
SPECIFIC
SERVICE
INSTRUCTIONS
....
1.6...
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6
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SERVICE
ADJUSTMENTS...
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STANDARD
CIRCUIT
DIAGRAM
(APPENDED)
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COPYRIGHT
©
1996
VICTOR
COMPANY
OF
JAPAN,LTD.
Noon
at
Jul.1996

AV-35750
AV-35770
SPECIFICATIONS
ptm TP omtent
Dimensions (W XH xD)
Mass
TV System and Color system
TV RF System
Color System
Sound System
TV Receiving Channels and Frequency
VL Band
VH Band
UHF Band
CATV Receiving Channels and
Frequency (Quartz Synthesizer system)
Low Band
High Band
Mid Band
Super Band
Hyper Band
ULTRA Band
Sub Mid Band
TV/CATV Total Channel
Intermediate Frequency
Video IF Carrier
Sound IF Carrier
Color Sub Carrier
Antenna terminal
Power Input
Power Consumption
Input Current
Picture Tube
High Voltage
Speaker
Audio Power Output
Input (1, 2)
S-VIDEO IN
Variable / Fix Audio Output
AV Compulink Input
Remote Control Unit
33-7/8" X 30-1/8" x 23-3/4” / 86cm x 76.5cm x 60.3em
152.3lbs / 69.2kg
CCIR (M)
NTSC
BTSC (Multi Channel Sound)
(02 ~ 06) 54MHz ~ 88MHz
(07 ~ 13) 174MHz ~ 216MHz
(14 ~ 69) 470MHz ~ 806MHz
(02 ~ 06, A-8) by (02 ~ 06801)
(07 ~ 13) by (07 ~ 13)
(A ~ 1) by (14 ~ 22)
(J ~ W) by (23 ~ 36)
(W +1 ~ W+ 28) by (37 ~ 64)
(W +29 ~ W +84) by (65 ~ 125)
(A8, A4 ~ A1) by (01, 96 ~ 99)
180 Channels
(54MH2~ 804MHz)
45.75MHz
41.25MHz (4.5MHz)
3.58MHz
75Q (VHF/UHF) Terminal, F-Type Connector
120V AC, 60Hz
135W(US)
1,.8A(CA)
35”(89cm) measured diagonally, Full Square
31kV +1.3kV (at zero beam current )
3-3/16” x 4-3/4” / 8X 12cm Oval Type x2
3W +3W
Video : 1 Vp-p 75Q (RCA pin jack)
Audio : 500 mV rms (-4dBs), High impedance (RCA pin jack)
Y : 1 Vp-p positive (negative sync provided,when terminated with 752)
C : 0.286 Vp-p ( burst signal, when terminated with 75Q)
Variable: More than 0~ 1550mV rms ( + 6dBs)
Low Impedance (400Hz when modulated 100%) (RCA pin jack)
Fix : 500 mV rms (-4dBs)
Low Impedance (400Hz when modulated 100%) (RCA pin jack)
RECEIVER / AMP: 3.5mm mini jack
VCR ONLY : 3.5mm mini jack
RM-G742-1C (AA/RG/UM-3 dry baltery x 2) : [AV-35750(US&CA)]
RM-C732-1A (AAA/ROS/UM-4 dry battery x2) : [AV-35770(US)]
Design & specification subject to change without notice.
2 (No.51130)

SAFETY PRECAUTIONS
The design of this product contains special hardware, many circuits
and components specially for safety purposes. For continued pro-
tection,zno 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.
Alterations of the design or circuitry of the products should not be
made. Any design alterations or additions will void the manufactur-
er's warranty and will further relieve the manufacturer of responsi-
bility for personal injury or property damage resulting therefrom.
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 fea-
tures are identified by shading on the schematics and by
(A) on the parts list in Service manual. The use of a substi-
tute replacement which does not have the same safety characteris-
tics as the recommended replacement part shown in the parts list
of Service manual may cause shock, fire, or other hazards.
Use isolation transformer when hot chassis.
The chassis and any sub-chassis contrained in some products are
connected to one side of the AC power fine. An isolation transform-
er 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.
Don't short between the LIVE side ground and ISOLAT-
ED(NEUTRAL) side ground or EARTH side ground when re-
pairing.
Some model's power circuit is partly different in the GND. The dif-
ference of the GND is shown by the LIVE : ( ) side GND, the
ISOLATED(NEUTRAL) : ( ar) side GND and EARTH : ( ) side
GND. Don't short between the LIVE side GND and !SOLAT-
ED(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.
if any repair has been made to the chassis, it is recommended that
the B, setting should be checked or adjusted (See ADJUSTMENT
OF B, POWER SUPPLY).
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 dam-
age, therefore operation under excessive high voltage conditions
should be kept to a minimum, or should be prevented. If severe ar-
cing 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 volt-
age circuitry including the picture tube must be the exact replace-
ments or alternatives approved by the manufacturer of the com-
plete product.
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 10kQ 2W resistor to the anode button.
When service is required, observe the original lead dress. Extra pre-
caution should be given to assure correct lead dress in the high
voltage circuit area. Where a short circuit has occurred, those com-
ponents that indicate evidence of overheating should be replaced.
Always use the manufacturer's replacement components.
10°
(1)
(2)
tsolation 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, vid-
eo/audio input and output terminals, Control knobs,metal cabinet,
screwheads, earphone jack, control shafts, etc.) to be sure the prod-
uct is safe to operate without danger of electrical shock.
Dielectric Strength Test
The isolation between the AC primary circuit and all metal parts ex-
posed to the user, particularly any exposed metal part having a re-
turn 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 rat-
ed 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.
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.).
¢ Alternate Check Method
Piug the AC line cord directly into the AC outlet (do not use a line
isolation transformer during this check.). Use an AC voltmeter hav-
ing 1000 ohms per volt or more sensitivity in the following manner.
Connect a 1500Q 10W resistor paralleled by a 0.15pF AC-type ca-
pacitor between an exposed metal part and a known good earth
ground (water pipe, etc.). Measure the AC voltage across the resis-
tor with the AC voltmeter. Move the resistor connection to each ex-
posed metal part, particularly any exposed metal part having a re-
turn path to the chassis, and measure the AC voltage across the re-
sistor. Now, reverse the plug in the AC outlet and repeat each mea-
surement. Any voltage measured must not exceed 0.35V AC
{r.m.s.). This corresponds to 0.56mA AC (r.m.s.).
AC VOLTMETER
(HAVING 1000Q/V,
OR MORE SENSITIVITY)
0.15pF AC-TYPE
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
15002 10W
GOOD EARTH GROUND
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”.
This mark shows a fast operating fuse, the letters indicated
below show the rating.
(No.51 130) 3
AV-35750
AV-35770

AV-35750
AV-35770
FEATURES
® New chassis design enables use of a main board with
simplified circuitry.
® Comb filter improved picture quality.
® Provided with miniature tuner (TV / CATV)
® Full-square CRT (cathode ray tube) reproduces fine textured
picture in every detail.
®@ PLL synthesizer system TV / CATV totaling 180 channels.
@® AV COMPU LINK terminals allow simultaneous mode
switching of the TV, connected receiver (or amplifier) and/or
VCR.
4 (No.51130)
Closed-caption broadcasts can be viewed.
With AUDIO. VIDEO INPUT terminal.
S-VIDEO input terminal for taking best advantage of Super
VHS.
Variable audio output terminal.
Built-in PIP system.
An auto demonstration function demonstrates the features of
this model.
\2C bus control utilizes single chip ICs.

DIFFERENCE LIST OF MAIN PARTS
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AV-35750(US)
AV-35750(CA)
AV-35770(US)
Part
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(No.84130) 5

AV-35750
AV-35770
SPECIFIC SERVICE INSTRUCTIONS
REPLACEMENT OF CHIP COMPONENT
MCAUTIONS
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.
MSOLDERING IRON
1. Use a high insulation soldering iron with a thin pointed end of it.
2. A 30w soldering iron is recommended for easily removing paris.
MREPLACEMENT STEPS
1. How to remove Chip parts
Resistors, capacitors, etc
(1) As shown in the figure, push TWEEZERS (2) Shift with tweezers and remove
the part with tweezers and the chip part. TWEEZERS
alternately melt the solder at Q
each end.
By
eTransistors, diodes, variable resistors, etc
(1) Apply extra solder to each q (2) As shown in the figure, push the
lead. part with tweezers and
alternately melt the solder at
each lead. Shift and remove the
chip part.
TWEEZERS
SOLDER
Note: After removing the part, remove remaining solder from the pattern.
2. How to install Chip parts
@Resistors, capacitors, etc
(1) Apply solider to the pattern (2) Grasp the chip part with
as indicated in the figure. tweezers and place it on the TWEEZER
solder. Then heat and melt the
solder at both ends of the chip
part.
Transistors, diodes, variable resistors, etc .
(1) Apply solder to the (2) Grasp the chip part with (3) First solder lead A as (4) Then solder leads B and C.
pattern as indicated in the tweezers and place it on indicated in the figure.
figure. the solder.
(A) (B)
(C)
6 (No.51130)

DISASSEMBLY PROCEDURE
REMOVING THE REAR COVER
1. Unplug the power supply cord.
2. Remove the 11 screws marked @) as shown in Fig. 2.
* When reinstalling the rear cover, carefully push it inward after
inserting the chassis into the rear cover groove.
REMOVING THE CHASSIS
e@ After removing the rear cover.
1. Slightly raise the both sides of the chassis by hand and
remove the two claws under the both sides of the chassis from
the front cabinet.
2. Draw the chassis backward along the rail in the arrow direction
marked as shown in the Fig. 2.
(I necessary, take off the wire clamp, connectors 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 FRONT CONTROL PW BOARD
@ After removing the rear cover and chassis.
1. Remove the 2 screws marked ©) as shown in Fig. 2.
2. Remove the FRONT CONTROL PW BOARD toward you.
REMOVING THE TERMINAL BOARD
e After removing the rear cover.
1. Remove the 4 screws marked ©) as shown in Fig. 2.
2. After removing the claw marked © from the AV JACK PWB
in the direction of arrow mark as shown in Fig.1, remove the 2
claws marked ©) in the direction of arrow mark, then take off
the TERMINAL BOARD in the direction of arrow marked ©.
REMOVING THE ANT SPLITTER
1. Remove a screw marked (a) as shown Fig.1.
CHECKING THE MAIN PW BOARD
1. To check the back side of the MAIN PW Board.
4) 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
contacting with olher PWB.
® Before turning on power, make sure thal the wire connector,
CRT earth wire and other connectors properly connected.
AV-35750
AV-35770
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.
AV JACK PWB
ANT
SPLITTER
MAIN PWB
Fig.1
)
|
|
|
(No.5 1130) 7

AV-35750
AV-35770
FRONT CABI.
CRT SOCKET PWB
MAIN PWB
CHASSIS BASE
FRONT CONTROL PWB
Fig. 2
8 (No.51130)

AV-35750
AV-35770
REMOVING THE CRT. CRT CHANGE TABLE
* Replacement of the CRT should be performed by two or more
persons.
@
After
removing
the
rear
cover,
chassis
etc..,
5
,
APPROX.
1. Putting the CRT change table on soft cloth, the CRT change
table should also be covered with such soft cloth.
(shown in Fig. 3)
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 four screws marked by arrows with a box type screw
driver as shown in Fig. 4.
@ Since the cabinet will drop when screws have been removed,
be sure to support the cabinet with hands.
4. After four screws have been removed, put the cabinet siowly
on cloth (At this time, be carefully so as not to damage the
front surface of the cabinet) shown in Fig.5.
@ The CRT should be assembled according to the opposite
sequence of its dismounting steps.
* The CRT change table should preferably be smaller than the
CRT surface, and its height be about 35cm.
vT
a
'
rr carta tan
BOX
TYPE
SCREW
DRIVER
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.
6.
Wipe
around
the
anode
button
with
clean
and
dry
cloth.
(Fig.
6)
CABINET
Coat
silicon
grease
on
the
section
around
the
anode
button
.
At
this
time,
take
care
so
that
any
silicon
grease
does
not
stick
to
the
anode
button.
(Fig.
7)
* Silicon grease product No.: KS - 650N
Anode button
Approx. Silicon grease
20mm(Do not | should be coated
coat greaseon -> <- by 5mm or more
this section). from the outside
: diameter of |
anode cap. ;
Anode button
(No sticking of
silicon grease)
Silicon grease coating Coating position
of silicon grease
Anode cap
{
3
Fig. 6 Fig. 7
(No.5 1130) 9

AV-35750 |
AV-35770
MEMORY IC REPLACEMENT
1. Memory IC
This model uses a memory (EEP-ROM) IC.
The memory IC stores data for proper operation of the video and deflection circuits.
When replacing, be sure to use an IC containing this (initial value) data.
2. Memory IC replacement procedure
Procedure
Power off
Switch off the power and disconnect the power cord from the outlet.
Replace the memory IC.
Initial value must be entered into the new IC.
Power on
Connect the power cord to the outlet and switch on the power.
System constant check and setting
Simultaneously press the DISPLAY key and VIDEO STATUS key of
the remote control unit.
The SERVICE MENU screen of Fig. 1 is displayed.
While the SERVICE MENU is displayed, again simultaneously press
the DISPLAY and VIDEO STATUS keys to display the Fig. 2
SYSTEM CONSTANT screen.
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.)
After adjusting, release the MENU LEFT / RIGHT key to store the
setting value.
Press the EXIT key twice to return the normal screen.
Receive channel setting
Refer to the OPERATING INSTRUCTIONS(USER’S GUIDE) and
set the receive channels (Channels Preset) as described.
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 setting
Verify what to set in the SERVICE MENU, and set whatever is
necessary. (Fig. 1) refer to the SERVICE ADJUSTMENT for setting.
10 (No.51130)
Screen display
SERVICE MENU
PICTURE SOUND
THEATER OTHERS
PIP
LOW LIGHT HIGH LIGHT
RF AFC 1 RF AFC 2
12C BUS CTRL
SELECT By[ally]
OPERATE BY[4][>] Exit BY @
SYSTEM CONSTANT
MODEL : AV-35750:[AV-35750]
AV-35770:[AV-35770]
CCD: YES
setect sy[ally]
OPERATE BY[4][>] exit By @

AV-35750
AV-35770
Setting value
TABLE 1 (System Constant setting)
AV-27730 —> AV-27750 —> AV-27770
L AV-32720 —> AV-32730 —> AV-32750
S AV-32770 —> AV-35750 —> AV-35770
TABLE 2 (User setting)
1. Use remote
controller
keys
DISPLAY
OFF
POWER
OFF
VIDEO
STATUS
STANDARD
CHANNEL
CH
-
02
SLEEP
TIMER
00
VOLUME
Proper
sound
volume
PIP
SOURCE
CH
-
04
TV
/
VIDEO
TV
PIP
POSITION
Lower
left
CLOSED
CAPTION
OFF
(CC1
/T1)
:
[AV-35750]
OFF (CC1/ 71 / BLACK) : [AV-35770]
HYPER SURROUND | OFF
AV-35750 : [AV-35750]
AV-35770 : [AV-35770]
2. Settings from MENU
TINT
CENTER
TV
SPEAKER
ON
COLOR
CENTER
AUDIO
OUT
FIX
PICTURE
CENTER
LANGUAGE
ENG
BRIGHT
CENTER
CLOSED
DETAIL
CENTER
CAPTION
CAPTION
:CC1
TEXT :T1
NOTCH
OFF
BACKGROUND
:
BLACK
:
[AV-35770]
NOISE MUTE ON
SET
VIDEO
STATUS
|
CENTER
AUTO
TUNER
SET UP OTHERS
BASS CENTER
TREBLE
CENTER
CHANNEL
BALANCE
CENTER
SUMMARY
Set
optionaily
MTS
STEREO
Stations
02
—
04 —
SET
CLOCK
Unnecessary
to
set
07
—
ON / OFF TIMER NO
SET
LOCK
CODE
Unnecessary
to
set
TUNER
MODE
AIR
AUTO DEMO Unnecessary to set
(No.51130) 11

ers
SERVICE ADJUSTMENTS
ADJUSTMENT PREPARATION:
1. You can make the necessary adjustments for this unit with either the Remote Control Unit or with the adjustment tools and
parts as before.
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. Turn on the power for the set and test equipment before use, and start the adjustment procedures after waiting at least 30 minutes.
4. Make sure that AC power is turned on correctly.
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, condensers, etc.
7. Presetting before adjustment.
Unless otherwise specified in the adjustment instructions, preset the following functions with the Remote Control Unit:
(1) VIDEO STATUS STANDARD _ || (3) HYPER SURROUND
(2) NOTCH [OFF ——_—|{(4) BASS, TREBLE, BALANCE CENTER
TESTERS & TOOLS ADJUSTMENT ITEMS
‘ta
B1 voltage check WHITE BALANCE (Low Light) | PIP CIRCUIT (7 ITEMS)
IF VCO WHITE BALANCE (High Light) | MTS INPUT LEVEL check
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
SUB BRIGHT MTS STEREO VCO
FOCUS SUB CONTRAST MTS SAP VCO
V. CENTER, V. SIZE SUB COLOR MTS FILTER check
and V.POSITION
H. POSITION | SUB TINT | MTS SEPARATION
POWER VOL CH
ADJUSTMENT LOCATIONS
FRONT
t
MAIN PWB ASS'Y
i E7G) (2) eae
ICBO1 bd [ DEG. ]
C]
rosa. re
CO (SOLDER SIDE) es
AV SELECTOR PWB
eS @ |correct
O
| om 4
SUNER PEHO
C=] pot (a=) CRT EARTH
(BRAIDED ASS'Y)
CRT SOCKET PWB ASS'Y
UPPER : FOCUS
LOWER : SCREEN
CRT EARTH
(BRAIDED ASS'Y)
12 (No.51130)

AV-35750
AV-35770
BASIC
OPERATION
OF
SERVICE
MENU
1.
The
REMOTE
CONTROL
UNIT
is
used
for
the
SERVICE
MENU
operation.
2.
In
general,
the
ten
basic
setting
(adjustments)
items
or
verifications
are
performed
in
the
SERVICE
MENU.
(1)PICTURE
.....
This
sets
the
setting
values
(adjustment
values)
of
the
VIDEO
/
CHROMA
and
DEFLECTION
circuits.
(2)SOUND
.......
This
sets
the
setting
values
(adjustment
values)
of
the
AUDIO
circuit.
(3)
THEATER
.....
This
is
used
when
the
THEATER
MODE
is
adjusted.
(4)OTHERS
......
This
sets
the
setting
values
(adjustment
values)
of
the
OTHERS
circuit.
(5)PIP
..........
This
sets
the
setting
values
(adjustment
values)
of
the
PICTURE-IN-PICTURE
circuit.
(6)
LOW
LIGHT
...
This
sets
the
setting
values
(adjustment
values)
of
the
WHITE
BALANCE
circuit.
(7)
HIGH
LIGHT...
This
sets
the
setting
values
(adjustment
values)
of
the
WHITE
BALANCE
circuit.
(8) RF AFC 1 ..... This is used when the IF VCO is adjusted.
(9)RF
AFC
2
.....
This
is
used
when
the
IF
VCO
is
adjusted
of
the
PIP.
(10)
l2C
BUS
CTRL
This
is
used
when
ON
/
OFF
of
the
12C
BUS
CTRL
is
set.
SERVICE MENU
3. Basic Operations of the SERVICE MENU
(1)
How
to
enter
the
SERVICE
MENU.
cs
pede
PICTURE
SOUND
1)
Press
the
DISPLAY
KEY
and
VIDEO
STATUS
KEY
of
the
REMOTE
hoa
OTHERS
=
CONTROL
UNIT
at
the
same
time
to
display
the
SERVICE
MENU
:
LOW
LIGHT
HIGH
LIGHT
screen
shown
in
Flg.1.
YELLOW
RF
AFC
1
RF
AFC
2
12C
BUS
CTRL
(2)
SERVICE
MENU
screen
selection
SELECT
ay[ally]
1)
Press
the
UP
/
DOWN
key
of
the
MENU
to
select
any
of
the
following
OPERATE
ByL<][>]
EXIT
BY
@
items.(The
letters
of
the
selected
items
are
displayed
in
yellow.)
Fig.
1
SERVICE
MENU
@
PICTURE
@
SOUND
@
THEATER
e@
OTHERS
@PIP
@ LOW
LIGHT
@ HIGH
LIGHT
@RF
AFC
1
@RF
AFC
2
e12C
BUS
CTRL
2)
Select
any
of
PICTURE,
SOUND
or
OTHERS.
The
screen
shown
in
Fig.2
will
be
displayed
if the
LEFT
/
RIGHT
KEY
is
pressed.
3)
If
the
UP
/
DOWN
KEY
is
pressed,
the
PICTURE
MODE
screen
Bas
shown
in
Fig.3
or
the
SOUND
MODE
screen
shown
in
Fig.4
or
the
=
OTHERS
MODE
screen
shown
in
Fig.5
is
displayed
and
the
alae
PICTURE,
SOUND
or
OTHERS
setting
can
be
performed.
VALUE
Hin
Grewsererce
¥
(Adjust)
SETTING
VALUE
serme,,|,|,,
a,
nEM
STATUS
Fig.
3
PICTURE
MODE
1.
ATTENUATOR
1,
OSD
POS.
STATUS
XXXXXXXX
Fig.
4
SOUND
MODE
Fig.
5
OTHERS
MODE
(No.51130) 13

AV-35750
AV-35770
4) Select the PIP, The screen shown in Fig.6 will be displayed in the
LEFT / RIGHT KEY is pressed.
5) If the UP / DOWN KEY is pressed, the PIP MODE screen shown in
Fig.7 is displayed and the PIP setting can be performed.
6) If any of the THEATER / LOW LIGHT / HIGH LIGHT / RF AFC 1 /
RF AFC 2 / l2C BUS CTRL items are selected and the LEFT /
RIGHT KEY is pressed, the screens shown in Fig. 8, 9, 10, 11, 12
and 13 are displayed respectively and the settings or verifications can
be performed.
TINT XXX GDRIVE XXX
GOLOR XXX BODRIVE XXX
PICTURE XXX
BRIGHT XXX
DETAIL XXX
setect sy[ally]
OPERATE BY[<][>] exit By
Fig. 8 THEATER MODE
@ BRIGHT 4] [>]
XXX
XXX XXX
Fig. 9 LOW LIGHT MODE
RF AFC 1 ON
FINE XX
STATUS XXXXXXXX
RF AFC 2 ON
FINE XX
SELecT ByY[al[y]
OPERATE BYL][>] exit BY @
Fig. 12 RF AFC 2 MODE
{Do not adjust]
setect By{ally]
opeRATE BY[<][>] exit By @®
Fig. 11. RE AFC 1 MODE
14 (No.51130)
seLect pBy[al[y]
Fig. 6
[ally] (<)>)
1. ASPECT XXX
Fig. 7 PIP MODE
HIGH LIGHT
XXX XXX
Fig. 10 HIGH LIGHT MODE
2G BUS ON
secect sBy[all[¥]
OPERATE BY[4][*] Exit BY @
Fig. 13 120 BUS CTRL MODE
[Fixed ON]

(3) Setting method
1) UP/DOWN key of the MENU
Selects 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.
SETTING soretoepe 1. BRIGHT
(TEM
(4) Releasing SERVICE MENU
1) After returning to the SERVICE MENU upon completion of the
setting (adjustment) work, press the EXIT key again.
*
The
settings
for
LOW
LIGHT
and
HIGH
LIGHT
are
described
in
the
WHITE
BALANCE
page
of
ADJUSTMENT.
* The setting for RF AFC 1 are described in the IF VCO page
of ADJUSTMENT.
ects TINT XXX GODRIVE XXX
COLOR XXX BODRIVE XXX
PICTURE XXX
BRIGHT XXX
DETAIL XXX
seLect sy[al[¥]
operate BY[4][>] exit By
The letters of the selected ig
items are displayed in yellow. |~
@
THEATER MODE
(7 ITEMS)
oo Ss
“© RF AFC 1 ON
FINE XX
STATUS XXXXXXXK
setect sy[al[y] @
operate By [<][>] exit By
RF AFC 1 MODE
(2 ITEMS)
AV-35750
AV-35770
[ally]
XXX ewe aa |
STATUS
SO
PICTURE MODE
(No.1 ~No.20 ITEMS)
INITIAL.
SETTING VALUE
WW (Adjust)
SETTING VALUE
Lally]
1, ATTENUATOR
STATUS
SOUND MODE
(No.1~No.14 ITEMS)
[ally] IF)
XXX
1. OSD POS.
OTHERS MODE
(No.1 ~ No.9 ITEMS) : [AV-35750]
(No.1 ~ No.6 ITEMS) : [AV-35770]
Lally]
1. ASPECT
PIP MODE
(No.1~No.15 ITEMS)
(No.51130) 15

AV-35750
AV-35770
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”.
e PICTURE MODE
No. Setting (Adjustment ) item Variable range
AV-35750 AV-35770 .
BRIGHT
PICTURE
WPS (WHITE PEAK SUPPRESSOR)
TV DETAIL
aPpon ns
Ona
EXT BRIGHT
EXT PICT.
EXT DETAIL
EXT BPF (EXT B.P.FILTER)
EXT TINT
EXT COLOR
14, V SIZE
15. V CENTER
16. H POSITION
17. HAFC
18. BLANKING
19. RF AGC
20. PIF VCO
e SOUND MODE
initial setting value
. Setting (Adjustment ) item Variable range
AV-35750 AV-35770
ATTENUATOR
BALANCE
NOISE DET.
IN LEVEL (INPUT LEVEL)
FH MONITOR
STEREO VCO
PILOT CAN. (PILOT CANCELER)
FILTER
LOW SEP. (LOW SEPARATION)
aPpens
eno
5FH MON. (5FH MONITOR)
SAP VCO
IN GAIN (INPUT GAIN)
FIL.OFFSET
@ THEATER MODE
Setting (Adjustment ) item Variable range
TINT +20
COLOR +20
PICTURE +20
BRIGHT +20
DETAIL +15
G DRIVE -80 ~ +50
B DRIVE -80 ~ +50
16 (No.51130)

e OTHERS MODE
mae ae rene iv initial setting value
. Settin justment ) item Variable range
g (Adj ; ng AV-35750 | AV-35770
OSD POS.
CCD POS. (CLOSED CAPTION DECODER POS.)
SEARCH LN (SEARCH LINE)
SEARCH MD (SEARCH MODE)
oe OSD STAB oo cvsevsccaneetader dadesacerevesdes| deeeueentenctabaleetadeadsccaedeaduddsinnannsy codtenenedtcnays pedis
, LOCK DET
MENU COLOR
MENU PICT
_ MENU BRI
e PIP MODE
apron =
NO. Setting (Adjustment ) item Variable range
ASPECT
23
V POSITION
LOWER POS.
H POSITION
RIGHT POS.
oPonNn >
. CLAMP POS.
. FRAME
. Y/C DELAY
. CONTRAST
. G GAIN
. B GAIN
e LOW LIGHT MODE
initial setting value
Setting (Adjustment ) item Variable range
AV-35750 AV-35770
R CUTOFF " o~ os ‘| ~ 255
G CUTOFF
B CUTOFF
e HIGH LIGHT MODE
;
F
initial
setting
value
Setting
(Adjustment
)
item
Variable
range
AV-
|_AV-35750
|
AV-35770
_|
AV-35770
G
DRIVE
o~
hae
ee
|
~—=<—~«‘
'!SC~C<‘;:C*'
B
DRIVE
0
~
255
128
e RFE AFC 1 MODE
Setting (Adjustment ) item Variable range
AV-35750 AV-35770
RF
AFC
1
ON
/
OFF
ON
FINE
-77~
+77
+00
e RF AFC 2 MODE
‘
i
.
initial
setting
value
Setting
(Adjustment
)
item
Variable
range
AV-
|_AV-35750_
|
AV-35770
_|
AV-35770
RF AFC 2 ON / OFF Be i
FINE -77~ +77 lees |
e 12¢ BUS CTRL MODE
Setting (Adjustment ) item Variable range
AV-35750 AV-35770
fe OBO oe ane ee ON / OFF Fixed ON
AV-35750
AV-35770
(No.& 130) 17

AV-35750
AV-35770
Mi ADJUSTMENTS
B1 VOLTAGE CHECK
Measuring : .
Test point Adjustment part Description
instrument
B1 voltage Dc B1 ( [Bi] . Receive a monoscope pattern ee ne
check Voltmeter Connector . Connect the DC voltmeter to [B1] [B1] connector fr] pin (TP-91)
[1] pin) and TP-E (74) (B1 connector [3 | [3] pin). ‘
(TP-91) . Confirm that the voltage is DC 136V +3V.
TP-E(x4-)((B1]
Connector[3]
pin)
ADJUSTMENT OF IF. VCO
Measurin
2 Adjustment part Description
instrument
IF VCO Oscillo- CW TRANSF. . Receive the color bar signal.
adjustment scope Ge so (T7131) . Connect the oscilloscope to pin [3]or the connecior.
pin . Select the [RF AFC 1] MODE of the SERVICE MENU. Set
Signal [RF AFC 1] MODE the RF AFC to OFF and FINE to +00.
generator . Turn T131, verify that the AFC output voltage changes quickly
between 2.5V+1.5V and then adjust the voltage to
2.5V +0.2V.
. Return the RF AFC to ON.
. Cancel the service menu and check that no irregularities are
displayed on the screen.lf there any irregularities, select [RF
AFC 1] MODE on the service menu and verify that FINE is 00
when the AFC is ON. Repeat steps 3 to 5 if necessary.
AFC setting The variation
voltage : must be greater
2.5V +0.2V then2.5V + 1.5V
ADJUSTMENT OF RF AGC
RF.AGC No.19 RF AGC . Receive a broadcast.
adjustment . Select “No.19 RF AGC” of the PICTURE MODE.
. Press the MUTE key and turn off color.
. With the MENU LEFT key, get noise in the screen picture. (0
side of setting value)
. Press the MENU RIGHT key and stop when noise disappears
from the screen.
. Change to other channels and make sure that there is no
irregularity.
. Press the MUTE key and get color out.
ADJUSTMENT OF FOCUS
FOCUS Signal FOCUS VR . Receive a crosshatch signal.
adjustment generator [built-in HVT] . While looking at the screen, adjust FOCUS VR so that the
vertical and horizontal lines will be clear and in fine detail.
. Make sure that the picture is in focus even when the screen
gets darkened.
8 (No.51130)

ADJUSTMENT OF DEFLECTION CIRCUIT
V.CENTER,
V.SIZE and
V.POSITION
Adjustment
screen
size
92%
H.WIDTH,
SIDEPIN
CORRECT
and
H.POSITION
Adjustment
Measuring ;
Test point
instrument
Signal
generator
screen
size
Picture (100%)
size
Signal
generator
Adjustment part
No.14 V SIZE
No.15 V CENTER
V.CENTER SW
($1421)
Picture
size
100%
No.16 H POSITION
SIDEPIN CORRECT
VR (R1579)
H.WIDTH VR
(R1581)
AV-35750
AV-35770
Description
1. Receive a crosshatch signal.
. Make sure that the “No.15 V CENTER” of the PICTURE
SERVICE MODE is 0.
. Use the LIFT / RIGHT keys of the MENU to set the initial
setting value for the No.14 V SIZE.
. Adjust the vertical SCREEN size to 92% with the No.14 V
SIZE and $1421 (V.CENTER SW).
1. Receive a crosshatch signal.
. Adjust the SIDEPIN CORRECT. VR(R1579) so that vertical
lines at both side of the crosshatch are straight.
. Select the “No.16 H POSITION” of the PICTURE SERVICE
MODE.
. Press the LEFT / RIGHT keys of the MENU to set the initial
setting value for the “No.16 H POSITION”.
. Adjust the “No.i6 H POSITION” until the screen will be
horizontally centered.
. Adjust the H.WIDTH VR (R1581) so that 92%of the overall
crosshatch is displayed on the screen.
. As required, repeat above steps 2 and 6.
(No.51130) 19

AV-35750
AV-35770
ADJUSTMENT OF VIDEO / CHROMA CIRCUIT
Measuring
Test point Adjustment item
instrument
WHITE Signal BRIGHT
BALANCE generator R CUTOFF
(Low Light) G CUTOFF
adjustment B CUTOFF
SCREEN VR
[LOW LIGHT] MODE
G CUTOFF
De
REMOTE CONTROL UNIT
H.LINE ON H.LINE OFF EXIT
Oo © ©
RCUTOFFA
GCGUTOFFA
B
CUTOFFA
O © ©
R CUTOFFYW G CUTOFFY B CUTOFFY
O © ©
WHITE Signal G DRIVE
BALANCE generator B DRIVE
(High Light)
adjustment
[HIGH LIGHT] MODE
G DRIVE B DRIVE
;
i
: HIGH LIGHT ;
Becverorrneavecs XXX XXX
20 (No.51130)
Description
. Receive a monoscope pattern signal.
. Select the [LOW LIGHT] MODE from the SERVICE MENU.
. Set the initial setting value of “BRIGHT” with the LEFT /
RIGHT Key of the Remote control unit.
. Set the initial setting value of “R CUTOFF”, “G CUTOFF”
and “B CUTOFF” with the @ to © keys of the Remote
control unit.
. Display one horizontal line by pressing the ® key of the
Remote control unit.
. Turn the screen VR all the way to the left.
. Turn the screen VR gradually to the right from the left until
either one of the red, biue or green colors appears slightly.
. Adjust the two colors which did not appear until the one
horizontal line that is displayed becomes white using the @ to
©) keys of the Remote control unit.
9. Turn the screen VR until the first horizontal line is displayed
slightly.
10.Press the @ key to return to the regular screen.
11.Check the PIP brightness and adjust it by the screen VR if it is
not optimal.
* The @ EXIT key is the cancel key for the WHITE BALANCE.
. Receive a monoscope pattern signal.
. Select the [HIGH LIGHT] MODE in the SERVICE MENU.
. Set the initial setting value of “G DRIVE” and “B DRIVE”
with the &, ©, @ and © keys of the Remote control unit.
. Adjust the screen unit it becomes white using the ©, ©,
and @ keys of the Remote control unit.
The @ EXIT key is the cancel key for lhe WHITE BALANCE.
Remote control unit
@key : H.LINE ON
@key : H.LINE OFF
Okey : EXIT
®key : G DRIVE &
©key : B DRIVE A
®key : G DRIVE ¥
Okey: B DRIVE W