JVC AV-35750 User manual

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SAFETY
PRECAUTIONS
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OPERATING
INSTRUCTIONS
[AV-35750]
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OPERATING
INSTRUCTIONS
[AV-35770]
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DIFFERENCE
LIST
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MAIN
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2.26.2
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SPECIFIC
SERVICE
INSTRUCTIONS
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SERVICE
ADJUSTMENTS...
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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)
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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 @