JVC AV-14F703 User manual

SERVICE MANUAL
AV-14F703
COLOR TELEVISION
No. 52002
Apr. 2002
COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.
AV-14F703
CONTENTS
aSPECIFICATIONS ....................................................................................................................................2
aOPERATING INSTRUCTIONS (APPENDIX)
aSAFETY PRECAUTIONS ........................................................................................................................3
aSPECIFIC SERVICE INSTRUCTIONS ....................................................................................................4
aSERVICE ADJUSTMENTS ......................................................................................................................9
aGUIDE FOR REPAIRING .......................................................................................................................14
aSTANDARD CIRCUIT DIAGRAM ........................................................................................................ 2-1
aPARTS LIST ...........................................................................................................................................21

2 No. 52002
AV-14F703
SPECIFICATIONS
TELEVISION
Picture Tube: 14” (measured diagonally)
Color System: NTSC
TV RF System: CCIR (M)
Tuner Type: 181 Channel, Quartz PLL Frequency Synthesized
Receiving Channels: VHF 2-13
UHF 14-69
CATV 01-97 (5A)-(A-3)
98-99 (A-2)-(A-1)
14-22 (A)-(I)
23-36 (J)-(W)
37-65 (AA)-(FFF)
66-125 (GGG)-(125)
Intermediate Frequency: Picture (FP) : 45.75 MHz
Sound (FS) : 41.25 MHz
FP-FS : 4.50 MHz
Antenna Input: VHF/UHF In 75 ohms coaxial, F-Type Connector
Speaker: 1-5/8” (4 cm) x 2-13/16” (7 cm), 8 ohms x 2
Audio Output Power: 2.5 W + 2.5 W
GENERAL
Power Source: 120 V AC, 60 Hz
Power Consumption: 80 Watts
Dimensions(W x H x D): 17-1/8” (432 mm) x 13-5/8” (344.5 mm) x 15-1/2” (393.5 mm)
Weight: 26.4 Ibs/12 kg
Video/Audio Inputs: Component input
Y input: 1.0 Vp-p, 75 ohm (RCA pin jack)
Pb, Pr input : 0.7 Vp-p, 75 ohm (RCA pin jack)
S-Video input
Y input: 1.0 Vp-p, 75 ohm
C input: 0.3 Vp-p, 75 ohm
Video input: 1.0 Vp-p, 75 ohm (RCA pin jack)
Audio input: -8dB, 47 kohm (RCA pin jack)
Headphone Jack: 3.5 mm mini-jack
Storage Temperature -20 °C ~ 60 °C
Operating Temperature 5 °C ~ 40 °C
Accessories:
Remote Control X 1
Batteries (UM-3) X 2
Design & specification are subject to change without notice.

AV-14F703
No. 52002 3
SAFETY PRECAUTIONS
SERVICING NOTICES ON CHECKING
6. AVOID AN X-RAY1. KEEP THE NOTICES
As for the places which need special attentions,
they are indicated with the labels or seals on the
cabinet, chassis and parts. Make sure to keep the
indications and notices in the operation manual.
3. USE THE DESIGNATED PARTS
5. TAKE CARE TO DEAL WITH THE
CATHODE-RAY TUBE
Safety is secured against an X-ray by consider-
ing about the cathode-ray tube and the high
voltage peripheral circuit, etc.
Therefore, when repairing the high voltage pe-
ripheral circuit, use the designated parts and
make sure not modify the circuit.
Repairing except indicates causes rising of high
voltage, and it emits an X-ray from the cathode-
ray tube.
Please include the following informations when you order parts. (Particularly the VERSION LETTER.)
1. MODEL NUMBER and VERSION LETTER
The MODEL NUMBER can be found on the back of each product and the VERSION LETTER can be
found at the end of the SERIAL NUMBER.
2. PART NO. and DESCRIPTION
You can find it in your SERVICE MANUAL.
HOW TO ORDER PARTS
Inferior silicon grease can damage IC's and transistors.
When replacing an IC's or transistors, use only specified silicon grease (YG6260M).
Remove all old silicon before applying new silicon.
IMPORTANT
2. AVOID AN ELECTRIC SHOCK
There is a high voltage part inside. Avoid an
electric shock while the electric current is
flowing.
The parts in this equipment have the specific
characters of incombustibility and withstand
voltage for safety. Therefore, the part which is
replaced should be used the part which has
the same character.
Especially as to the important parts for safety
which is indicated in the circuit diagram or the
table of parts as a mark, the designated
parts must be used.
4. PUT PARTS AND WIRES IN THE
ORIGINAL POSITION AFTER
ASSEMBLING OR WIRING
There are parts which use the insulation
material such as a tube or tape for safety, or
which are assembled in the condition that
these do not contact with the printed board.
The inside wiring is designed not to get closer
to the pyrogenic parts and high voltage parts.
Therefore, put these parts in the original
positions.
In the condition that an explosion-proof cathode-
ray tube is set in this equipment, safety is
secured against implosion. However, when
removing it or serving from backward, it is
dangerous to give a shock. Take enough care to
deal with it.
PERFORM A SAFETY CHECK AFTER
SERVICING
7.
Confirm that the screws, parts and wiring which
were removed in order to service are put in the
original positions, or whether there are the
portions which are deteriorated around the
serviced places serviced or not. Check the
insulation between the antenna terminal or
external metal and the AC cord plug blades.
And be sure the safety of that.
(INSULATION CHECK PROCEDURE)
1.
2.
3.
4.
Unplug the plug from the AC outlet.
Remove the antenna terminal on TV and turn
on the TV.
Insulation resistance between the cord plug
terminals and the eternal exposure metal
[Note 2] should be more than 1M ohm by
using the 500V insulation resistance meter
[Note 1].
If the insulation resistance is less than 1M
ohm, the inspection repair should be
required.
[Note 1]
If you have not the 500V insulation
resistance meter, use a Tester.
[Note 2]
External exposure metal: Antenna terminal
Earphone jack
Licensed by BBE Sound, Inc. under USP4638258 and 4482866.
BBE and BBE symbol are registered trademarks of BBE
Sound, Inc.

4 No. 52002
AV-14F703
Rubber Cap
CRT
Support
GND on the CRT
Screwdriver
Alligator Clip
Support
CRT
GND on the CRT
1. REMOVAL OF ANODE CAP
Read the following NOTED items before starting work.
After turning the power off there might still be a potential
voltage that is very dangerous. When removing the
Anode Cap, make sure to discharge the Anode Cap's
potential voltage.
Do not use pliers to loosen or tighten the Anode Cap
terminal, this may cause the spring to be damaged.
*
*
REMOVAL
1. Follow the steps as follows to discharge the Anode Cap.
(Refer to Fig. 1-1.)
Connect one end of an Alligator Clip to the metal part of a
flat-blade screwdriver and the other end to ground.
While holding the plastic part of the insulated Screwdriver,
touch the support of the Anode with the tip of the
Screwdriver.
A cracking noise will be heard as the voltage is discharged.
Flip up the sides of the Rubber Cap in the direction of the
arrow and remove one side of the support.
(Refer to Fig. 1-2.)
2.
Fig. 1-1
Fig. 1-2
3. After one side is removed, pull in the opposite direction to
remove the other.
NOTE
DISASSEMBLY INSTRUCTIONS
INSTALLATION
1. Clean the spot where the cap was located with a small
amount of alcohol. (Refer to Fig. 1-3.)
NOTE
Confirm that there is no dirt, dust, etc. at the spot where
the cap was located.
2.
3.
Arrange the wire of the Anode Cap and make sure the
wire is not twisted.
Turn over the Rubber Cap. (Refer to Fig. 1-4.)
Fig. 1-4
4. Insert one end of the Anode Support into the anode
button, then the other as shown in Fig. 1-5.
CRT Support
Fig. 1-5
5.
6.
Confirm that the Support is securely connected.
Put on the Rubber Cap without moving any parts.
Location of Anode Cap
Fig. 1-3
Take care not to damage the Rubber Cap.
SPECIFIC SERVICE INSTRUCTIONS

AV-14F703
No. 52002 5
DISASSEMBLY INSTRUCTIONS
2. REMOVAL AND INSTALLATION OF FLAT
PACKAGE IC
REMOVAL
1. Put the Masking Tape (cotton tape) around the Flat
Package IC to protect other parts from any damage.
(Refer to Fig. 2-1.)
NOTE
Masking is carried out on all the parts located within
10 mm distance from IC leads.
Fig. 2-1
Masking Tape
(Cotton Tape)
IC
2. Heat the IC leads using a blower type IC desoldering
machine. (Refer to Fig. 2-2.)
NOTE
Do not add the rotating and the back and forth direc-
tions force on the IC, until IC can move back and forth
easily after desoldering the IC leads completely.
Fig. 2-2
Blower type IC
desoldering machine
IC
3. When IC starts moving back and forth easily after
desoldering completely, pickup the corner of the IC using
a tweezers and remove the IC by moving with the IC
desoldering machine. (Refer to Fig. 2-3.)
NOTE
Some ICs on the PCB are affixed with glue, so be
careful not to break or damage the foil of each IC
leads or solder lands under the IC when removing it.
Fig. 2-3
Blower type IC
desoldering machine
Tweezers
IC
4.
5.
Peel off the Masking Tape.
Absorb the solder left on the pattern using the Braided
Shield Wire. (Refer to Fig. 2-4.)
NOTE
Do not move the Braided Shield Wire in the vertical
direction towards the IC pattern.
Fig. 2-4
Braided Shield Wire
Soldering Iron
IC pattern

6 No. 52002
AV-14F703
DISASSEMBLY INSTRUCTIONS
Fig. 2-5
INSTALLATION
1. Take care of the polarity of new IC and then install the
new IC fitting on the printed circuit pattern. Then solder
each lead on the diagonal positions of IC temporarily.
(Refer to Fig. 2-5.)
Soldering Iron
Solder temporarily Solder temporarily
2. Supply the solder from the upper position of IC leads
sliding to the lower position of the IC leads.
(Refer to Fig. 2-6.)
Fig. 2-6
Solder
IC
Soldering Iron
Supply soldering
from upper position
to lower position
3. Absorb the solder left on the lead using the Braided
Shield Wire. (Refer to Fig. 2-7.)
NOTE
Do not absorb the solder to excess.
Fig. 2-7
Soldering Iron
IC
Braided Shield Wire
4. When bridge-soldering between terminals and/or the
soldering amount are not enough, resolder using a Thin-
tip Soldering Iron. (Refer to Fig. 2-8.)
Fig. 2-8
Thin-tip Soldering Iron
IC
5. Finally, confirm the soldering status on four sides of the
IC using a magnifying glass.
Confirm that no abnormality is found on the soldering
position and installation position of the parts around the
IC. If some abnormality is found, correct by resoldering.
NOTE
When the IC leads are bent during soldering and/or
repairing, do not repair the bending of leads. If the
bending of leads are repaired, the pattern may be
damaged. So, be always sure to replace the IC in this
case.

AV-14F703
No. 52002 7
SERVICE MODE LIST
This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily.
To enter the Service Mode, press both set key and remote control key for more than 1 second.
Set Key Remocon Key Operations
VOL. (-) MIN 0 Releasing of V-CHIP PASSWORD.
VOL. (-) MIN 1
VOL. (-) MIN 3
VOL. (-) MIN 6
VOL. (-) MIN 8
VOL. (-) MIN 9
Initialization of the factory.
NOTE: Do not use this for the normal servicing.
If you set a factory initialization, the memories are reset such as the channel
setting, and the POWER ON total hours.
POWER ON total hours is displayed on the screen.
Refer to the “CONFIRMATION OF HOURS USED.
Can be checked of the INITIAL DATA of MEMORY IC.
Refer to the “WHEN REPLACING EEPROM (MEMORY) IC”.
Writing of EEPROM initial data.
NOTE: Do not use this for the normal servicing.
Display of the Adjustment MENU on the screen.
Refer to the “ELECTRICAL ADJUSTMENT”(On-Screen Display Adjustment).
CONFIRMATION OF HOURS USED
POWER ON total hours can be checked on the screen.
Total hours are displayed in 16 system of notation.
NOTE: If you set a factory initialization, the total hours is reset to “0”.
1.
2.
3.
Remocon code selection.
NOTE: If you perform the remocon code selection, the remocon cannot be used. So,
do not select the remocon code for the normal servicing.
Set the VOLUME to minimum.
Press both VOL. DOWN button on the set and Channel
button (6) on the remote control for more than 1 second.
After the confirmation of using hours, turn off the power.
Initial setting content of MEMORY IC.
POWER ON total hours.
= (16 x 16 x 16 x thousands digit value)
+ (16 x 16 x hundreds digit value)
+ (16 x tens digit value)
+ (ones digit value)
INIT 00 A1
CRT ON 0010

8 No. 52002
AV-14F703
WHEN REPLACING EEPROM (MEMORY) IC
If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to
ensure correct data settings while making reference to TABLE 1.
3.
4.
5.
6.
7.
8.
The unit will now have the correct DATA for the new MEMORY IC.
Table 1
ADDRESS is now selected and should “blink”. Using the VOL. UP/DOWN button on the remote, step through the ADDRESS
until required ADDRESS to be changed is reached.
Press ENTER to select DATA. When DATA is selected, it will “blink”.
Again, step through the DATA using VOL. UP/DOWN button until required DATA value has been selected.
Pressing ENTER will take you back to ADDRESS for further selection if necessary.
Repeat steps 3 to 6 until all data has been checked.
When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.
Fig. 1
1.
2.
Enter DATA SET mode by setting VOLUME to minimum.
Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 1 second.
ADDRESS and DATA should appear as FIG 1.
ADDRESS DATA
INIT 00 A1
CRT ON 0010
A9 C3 02 00 31 B3 AF 37 9F 0A
+0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +FINI
4C 00 00 00 00 00 00 00 0010 00 00 00 0F 07 41 41
00 44 04 00 00 00 56
61 63 64 66 68 29 69 6A 6B20 62 6C 6D 6E 6F 50 70
51 52 72 53 73 73 54 54 7430 71 74 55 55 75 75 56
56 76 57 57 77 77 58 58 7840 76 78 59 59 79 79 5A
5A 7A 5B 5B 7B 7B 5C 5C 7C50 7A 7C 7C 5D 5D 5D 5D

AV-14F703
No. 52002 9
ELECTRICAL ADJUSTMENTS
1. ADJUSTMENT PROCEDURE
Read and perform these adjustments when repairing the circuits
or replacing electrical parts or PCB assemblies.
CAUTION
•
•
•
•
Use an isolation transformer when performing any service
on this chassis.
Before removing the anode cap, discharge electricity
because it contains high voltage.
When removing a PCB or related component, after
unfastening or changing a wire, be sure to put the wire
back in its original position.
When you exchange IC and Transistor for a heat sink,
apply the silicon grease on the contact section of the heat
sink. Before applying new silicon grease, remove all the
old silicon grease. (Old grease may cause damages to the
IC and Transistor.)
2. BASIC ADJUSTMENTS
Prepare the following measurement tools for electrical
adjustments.
1. Oscilloscope
2. Digital Voltmeter
3. Multi-Sound Signal Generator
4. Pattern Generator
2-1: CONSTANT VOLTAGE
1.
2.
3.
Set condition is AV MODE without signal.
Connect the digital voltmeter to the TP002.
Adjust the VR502 until the DC voltage is 115 ±1V.
2-2: RF AGC
1.
2.
3.
4.
5.
Place the set with Aging Test for more than 15 minutes.
Receive the VHF HIGH (63dB).
Connect the digital voltmeter between the pin 5 of CP101
and the pin 1 (GND) of CP101.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (02) on the remote control to
select “RF AGC”.
Press the VOL. UP/DOWN button on the remote control
until the digital voltmeter is 2.4 ±0.05V.
2-3: CUT OFF
1.
2.
3.
4.
5.
Adjust the unit to the following settings.
G. DRIVE=64, B. DRIVE=64, R. BIAS=32, G. BIAS=32,
B. BIAS=32
Place the set with Aging Test for more than 15 minutes.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (01) on the remote control to
select “CUT OFF”.
Adjust the Screen Volume until a dim raster is obtained.
2-5: FOCUS
1.
2.
3.
Receive the monoscope pattern.
Turn the Focus Volume fully counterclockwise once.
Adjust the Focus Volume until picture is distinct.
2-4: WHITE BALANCE
NOTE: Adjust after performing CUT OFF adjustment.
1.
2.
3.
4.
5.
6.
7.
Place the set with Aging Test for more than 10 minutes.
Receive the gray scale pattern from the Pattern Generator.
Using the remote control, set the brightness and contrast
to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (13) on the remote control to
select “R. BIAS”.
Press the CH. UP/DOWN button on the remote control to
select the “R. BIAS”, “G. BIAS”, “B. BIAS”, “B. DRIVE”or
“G. DRIVE”.
Adjust the VOL. UP/DOWN button on the remote control
to whiten the R. BIAS, G. BIAS, B. BIAS, B. DRIVE, and
G. DRIVE at each step tone sections equally.
Perform the above adjustments 5 and 6 until the white
color is looked like a white.
On-Screen Display Adjustment
1. In the condition of NO indication on the screen.
Press the VOL. DOWN button on the set and the Channel
button (9) on the remote control for more than 1 second to
appear the adjustment mode on the screen as shown in
Fig. 1-1.
Fig. 1-1
TV
00 OSD 15
3.
4.
Use the Channel UP/DOWN button or Channel button (0-
9) on the remote control to select the options shown in
Fig. 1-2.
Press the MENU button on the remote control to end the
adjustments.
Fig. 1-2
NO.
00
01
02
03
04
05
06
07
08
09
10
11
12
13
FUNCTION
OSD H
CUT OFF
RF.AGC
---
H.POSI
V.POSI
H.SIZE
V.SIZE
V.CENT
V.LIN
VS CORR
G.DRV
B.DRV
R.BIAS
NO.
28
29
30
31
32
33
34
35
36
37
38
39
40
88
FUNCTION
RGB CONTRAST
PARABOLA
TRAPEZIU
COR TOP
COR BTM
V EHT
H EHT
FM.LVL
LEVEL
SEP 1
SEP 2
T.STE
X-RAY
READ DATA
NO.
14
15
16
17
18
19
20
21
22
23
24
25
26
27
FUNCTION
G.BIAS
B.BIAS
BRI.CENT
SUB CONT
CONT.MAX
CONT.CENT
CONT.MIN
BRI.MAX
BRI.MIN
COL.MAX
COL.CENT
COL.MIN
TINT
SHARPNESS
SERVICE ADJUSTMENTS

10 No. 52002
AV-14F703
ELECTRICAL ADJUSTMENTS
2-6: HORIZONTAL POSITION
1.
2.
3.
4.
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast
to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (04) on the remote control to
select “H. POSI”.
Press the VOL. UP/DOWN button on the remote control
until the SHIFT quantity of the OVER SCAN on right and
left becomes minimum.
2-8: VERTICAL SIZE
1.
2.
3.
4.
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast
to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (07) on the remote control to
select “V. SIZE”.
Press the VOL. UP/DOWN button on the remote control
until the SHIFT quantity of the OVER SCAN on upside and
downside becomes 10 ±2%.
2-7: VERTICAL POSITION
1.
2.
3.
4.
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast
to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (05) on the remote control to
select “V. POSI”.
Press the VOL. UP/DOWN button on the remote control
until the horizontal line becomes fit to the notch of the
shadow mask.
2-10: BRIGHTNESS
1.
2.
3.
4.
5.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (16) on the remote control to
select “BRI. CENT”.
Press the VOL. UP/DOWN button on the remote control
until the brightness step No. becomes “50”.
Receive a broadcast and check if the picture is normal.
Press the INPUT button on the remote control to set to the
AV mode. Then perform the above adjustments 1~3.
Press the INPUT button on the remote control to set to the
CS mode. Then perform the above adjustments 1~3.
2-9: VERTICAL LINEARITY
NOTE: Adjust after performing adjustments in section 2-8.
After the adjustment of Vertical Linearity, reconfirm
the Vertical Position and Vertical Size adjustments.
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast
to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (09) on the remote control to
select “V. LIN”.
Press the VOL. UP/DOWN button on the remote control
until the SHIFT quantity of the OVER SCAN on upside and
downside becomes minimum.
1.
2.
3.
4.
2-11: TINT/COLOR CENT
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14
15.
16.
Fig. 2-1
Receive the color bar pattern. (RF Input)
Connect the oscilloscope to TP806.
Using the remote control, set the brightness, contrast,
color and tint to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (26) on the remote control to
select “TINT”.
Press the VOL. UP/DOWN button on the remote control
until the section “A”becomes a straight line
(Refer to Fig. 2-1).
Connect the oscilloscope to TP805.
Press the CH DOWN button 2 times to set to “COL.
CENT”mode.
Adjust the VOLTS RANGE VARIABLE knob of the
oscilloscope until the range between white 100% and
0% is set to 4.4 scales on the screen of the oscilloscope.
Press the VOL. UP/DOWN button on the remote control
until the red color level is adjusted to 115 ±10% of the
white level. (Refer to Fig. 2-2)
Receive the color bar pattern. (Audio Video Input)
Press the INPUT button on the remote control to set
to the AV mode. Then perform the above adjustments
2~9.
Press the INPUT button on the remote control to set to
the CS mode.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (26) on the remote control to
select “TINT”.
Press the VOL. UP/DOWN button on the remote control
until the tint step No. becomes “50”.
Press the CH DOWN button 2 times to set to
“COL.CENT”mode.
Press the VOL. UP/DOWN button on the remote control
until the color step No. becomes “62”.
“A”
Fig. 2-2
White 100% RED Level
100%

AV-14F703
No. 52002 11
ELECTRICAL ADJUSTMENTS
2-12: CONTRAST MAX MANUAL
1.
2.
3.
4.
5.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (18) on the remote control to
select “CONT. MAX”.
Press the VOL. UP/DOWN button on the remote
control until the contrast step No. becomes “85”.
Receive a broadcast and check if the picture is normal.
Press the INPUT button on the remote control to set
to the AV mode. Then perform the above adjustments
1~3.
Press the INPUT button on the remote control to set
to the CS mode. Then perform the above adjustments
1~3.
2-13: SEPARATION 1, 2
Please do the method (1) or method (2) adjustment.
Method (1)
1.
2.
3.
4.
5.
Set the multi-sound signal generator for each different L-
ch and R-ch frequency (Ex. L-ch=2KHz, R-ch=400Hz) and
receive the RF.
Connect the oscilloscope to the Audio Out Jack.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (37) on the remote control to
select “SEP 1”.
Press the VOL. UP/DOWN button on the remote control to
adjust it until the audio output wave becomes a fine sine
wave.
Press the CH UP button once the set to “SEP 2”mode.
Then perform the above adjustment 4.
Method (2)
1.
2.
3.
4.
5.
6.
7.
8.
9.
Set the multi-sound signal generator L-ch=1KHz, R-ch
=Non input and receive the RF.
Connect the oscilloscope to the Audio Out Jack (R-ch).
Press the AUDIO SELECT button on the remote control to
set to the stereo mode.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (37) on the remote control to
select “SEP 1”.
Press the VOL. UP/DOWN button on the remote control to
adjust it until the R-ch output becomes minimum.
Set the multi-sound signal generator L-ch=Non input,
R-ch=1KHz and receive the RF.
Connect the oscilloscope to the Audio Out Jack (L-ch).
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (38) on the remote control to
select “SEP 2”.
Press the VOL. UP/DOWN button on the remote control to
adjust it until the L-ch output becomes minimum.
2-15: Confirmation of Fixed Value (step No.)
Please check if the fixed values of the each adjustment
items are set correctly referring below.
NO.
06
08
10
17
19
20
21
22
23
25
27
28
29
30
31
32
33
34
35
39
FUNCTION
H SIZE
V CENT
VS CORR
SUB CONT
CONT CENT
CONT MIN
BRI MAX
BRI MIN
COL MAX
COL MIN
SHARP
RGB CONTRAST
PARABOLA
TRAPEZIN
COR TOP
COR BTM
V EHT
H EHT
FM LEVEL
T.STE
RF
00
25
10
15
40
10
88
32
100
10
30
18
00
00
00
00
00
00
01
00
AV
00
25
10
15
40
10
88
32
100
10
30
18
00
00
00
00
00
00
01
00
CS
00
25
10
12
40
10
88
32
100
10
30
18
00
00
00
00
00
00
01
00
2-14: OSD HORIZONTAL
1.
2.
Activate the adjustment mode display of Fig. 1-1.
Press the VOL. UP/DOWN button on the remote control
until the difference of A and B becomes minimum.
(Refer to Fig. 2-3)
Fig. 2-3
TV
00 OSD 15
AB

12 No. 52002
AV-14F703
ELECTRICAL ADJUSTMENTS
3. PURITY AND CONVERGENCE
ADJUSTMENTS
NOTE
1.
2.
3.
Turn the unit on and let it warm up for at least 30 minutes
before performing the following adjustments.
Place the CRT surface facing east or west to reduce the
terrestrial magnetism.
Turn ON the unit and demagnetize with a Degauss Coil.
3-1: STATIC CONVERGENCE (ROUGH ADJUSTMENT)
1.
2.
3.
4.
5.
6.
7.
8.
Tighten the screw for the magnet. Refer to the adjusted
CRT for the position. (Refer to Fig. 3-1)
If the deflection yoke and magnet are in one body,
untighten the screw for the body.
Receive the green raster pattern from the color bar
generator.
Slide the deflection yoke until it touches the funnel side of
the CRT.
Adjust center of screen to green, with red and blue on the
sides, using the pair of purity magnets.
Switch the color bar generator from the green raster
pattern to the crosshatch pattern.
Combine red and blue of the 3 color crosshatch
pattern on the center of the screen by adjusting the pair of
4 pole magnets.
Combine red/blue (magenta) and green by adjusting the
pair of 6 pole magnets.
Adjust the crosshatch pattern to change to white by
repeating steps 6 and 7.
3-2: PURITY
NOTE
Adjust after performing adjustments in section 3-1.
1.
2.
3.
4.
5.
Receive the green raster pattern from color bar generator.
Adjust the pair of purity magnets to center the color on the
screen.
Adjust the pair of purity magnets so the color at the ends
are equally wide.
Move the deflection yoke backward (to neck side)
slowly, and stop it at the position when the whole screen is
green.
Confirm red and blue color.
Adjust the slant of the deflection yoke while watching the
screen, then tighten the fixing screw.
DEFLECTION YOKE
DEFLECTION YOKE SCREW
MAGNET SCREW
6 POLE MAGNETS
4 POLE MAGNETS
PURITY MAGNETS
Fig. 3-1
3-3: STATIC CONVERGENCE
NOTE
Adjust after performing adjustments in section 3-2.
1.
2.
3.
Receive the crosshatch pattern from the color bar genera-
tor.
Combine red and blue of the 3 color crosshatch
pattern on the center of the screen by adjusting the pair of
4 pole magnets.
Combine red/blue (magenta) and green by adjusting the
pair of 6 pole magnets.
3-4: DYNAMIC CONVERGENCE
NOTE
Adjust after performing adjustments in section 3-3.
1.
2.
Adjust the differences around the screen by moving the
deflection yoke upward/downward and right/left.
(Refer to Fig. 3-2-a)
Insert three wedges between the deflection yoke and CRT
funnel to fix the deflection yoke.
(Refer to Fig. 3-2-b)
R G B
R
G
BR
G
B
R G B
UPWARD/DOWNWARD SLANT RIGHT/LEFT SLANT
Fig. 3-2-a
WEDGE WEDGE
WEDGE
WEDGE POSITION
Fig. 3-2-b

AV-14F703
No. 52002 13
ELECTRICAL ADJUSTMENTS
4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION)
CP401
TP002
CP801A
T501
VR502
TU001
J702 J701 J703 J708
CP1001
W169
R527
CP101
J704
FB401
AC IN
CD801
CRT
SPEAKER
CD1001
L503 CP502
CRT
CRT PCB
MAIN PCB
R808
TP806 CP804
CP805_1
J802
CP803
CD803
CRT
TP805
R806
S501
S502
CP507
CP508

14 No. 52002
AV-14F703
IC DESCRIPTION
NO. Pin name Symbol I/O Logic OptionFunction
1 P11/SCL1 AUDIO MUTE O 0 Audio MUTE Output C-MOS
2 P00/PM0 EXT MUTE O 1 Audio MUTE Output for external Output
3 P01/PWM1 STANDBY_H O 1 Output HIGH at a teleevision power off. Nch-OD
Nch-OD
4 P02/PWM2 BBE-H O BBE Control Output Nch-OD
5 P03/PWM3/AD1 AFT I Voltage of tuning input Nch-OD
6 P04/PWM4/AD2 KEY1 I Main unit key input Nch-OD
7 P05/AD3 KEY2 I Main unit key input Nch-OD
8 P06/INT2/AD4 X-RAY I Input terminal of X-RAY detection. Nch-OD
9 P07/INT1 REMOCON I Remote control input Nch-OD
10 P20/SCLK/AD5 ONTIMER LED O ON-TIMER LED control output. C-MOS
11 P21/AOUT/AD6 O C-MOS
12 P22/SIN/AD7 AV2 O External SW output2 C-MOS
13 P23/TIM3 AV1 O External SW output1 C-MOS
14 P24/TIM2 O C-MOS
15 P25/INT3 POWER FAIL I 0 Power failure detector input C-MOS
16 P26/XCIN DEGAUSS_H O 1 Degauss output C-MOS
17 P27/XCOUT X-RAY_TEST O 1 X-RAY detector input C-MOS
18 CNVSS CNVSS GND
19 XIN Xin I Main Oscillation
20 XOUT Xout O Main Oscillation
21 VSS VSS GND
22 VCC VCC 5V
23 FILT FILT
24 HLF HLF O Filter of slicer
25 VHOLD V.HOLD I Condenser of slicer
26 CVIN CVIN I Video signal input
27 RESET RESET I 0 Reset signal input
28 FSCIN (FSCIN) I (Main Clock Occurrence circuit input)
29 PONCONT/P15 POWER O 1 Power control output. C-MOS
30 P31/SCL3 SCL1 O Serial clock output (IIC BUS) C-MOS
31 P30/SDA3 SDA1 I/O Serial data input/output C-MOS
32 CLKCONT/P10 (CLOCK CONT) O (Main Clock Request output) C-MOS
33 P55/OUT BRANK O 1 BLANK Output for OSD/CCD C-MOS
34 P54/R RED R O 1 Red output of RGB image output C-MOS
35 P53/G GREEN G O 1 Green output of RGB image output C-MOS
36 P52/B BLUE B O 1 Blue output of RGB image output C-MOS
37 P51/VSYNC V.SYNC I 0 Vertical synchronization input
38 P50/HSYNC H.SYNC I 0 Horizontal synchronization input
39 P16/AD8/TIM2 SYNC I Input terminal for H-SYNC. C-MOS
40 P14/SDA2 IIC_OFF I 0 Serial clock/data stop input C-MOS
41 P13/SDA1 PROTECT O 1 Output HIGH at turning off a television. C-MOS
42 P12/SCL2 H_CTL O 1 Output HIGH at turning off a television. C-MOS
S
MAIN PCB OEC7075A (IC101)
GUIDE FOR REPAIRING

AV-14F703
No. 52002 15
TROUBLESHOOTING GUIDE
NO POWER
Yes
Is the voltage at the point (A)
in the Figure DC160V ?
Is the voltage at pin G
of Q502 DC5V ?
Yes
No
Check R501 and R541.
Check the rectifying circuit.
Yes
No
Yes
No
Is the voltage at the point (B)
in the Figure DC164V ?
Is the voltage at the point (C)
in the Figure AC120V ?
Yes
No
Broken wire of L501.
Is the voltage on both
ends of S501 AC120V ? Broken wire of F501.
Yes
No
Broken wire of AC cord or check
S501.
Is the voltage at the point (E)
in the Figure AC120V ?
Check Q502 and associated circuit.
Check Q514 and associated circuit.
No
T502
57
A
D
S
G
3
Q514
Q502
IC504
R501
B
D501~D504
L501
C
E
F501
S501
CD501

16 No. 52002
AV-14F703
TROUBLESHOOTING GUIDE
Is the heater voltage at
pin 4 of J802 AC6.2V ?
Is the high voltage of
ANODE 27KV~28KV ?
No
NO RASTER
Does the RASTER
appear at maximum
BRIGHT/CONTRAST ?
Yes
No
Is the voltage of pin 1 of
CP805 DC180V ?
Yes
No
Check the output circuit and
associated circuit.
Check the 180V line.
Yes Yes
No
Contact defects of CRT or CRT
Socket.
Check the HEATER circuit.
Yes
No
Is collector voltages
of Q405 DC114V and
Q402 DC27V ?
Check FB401 and associated circuit.
No
Yes
Is the waveform at base
of Q402 normal ?
No
Yes
Is the waveform at pin
34 of IC601 normal ?
Check the circuit from pin 34 of
IC601 to Q402.
Check IC601 and associated circuit.
Check Q402 and check peripheral
circuit.

AV-14F703
No. 52002 17
TROUBLESHOOTING GUIDE
NO COLOR
Are the waveforms at pins 3,
7 and 9 of J802 normal ?
Yes
No
Defect of CRT or contact defects
of J802.
Are the waveforms at pins 6,
7 and 8 of CP805 normal ?
Yes
No
Check the output circuit and
associated circuit.
Are the waveforms at
pins 14, 15 and 16 of
IC601 normal ?
Yes
No
Check R, G, B signal output
from IC601 to CP801.
Is the pulse of crystal
X601 normal ?
No
Yes
CHANGE X601.
Check the associated circuit of IC601.

18 No. 52002
AV-14F703
TROUBLESHOOTING GUIDE
NO VERTICAL
Is the waveform at pin
6 of CP401 normal ?
Yes
No
Check DY.
Is the waveform at pin
1 of IC401 normal ?
No
Yes Is the voltage at pin 2
of IC401 25V?
Yes
No
Check IC401 and check the
peripheral circuit.
Check the 25V line.
Is the waveform at pin
36 of IC601 normal ?
No
Yes
Check the associated circuit of IC601.
Check the circuit from pin 36 of
IC601 to pin 1 of IC401.

AV-14F703
No. 52002 19
TROUBLESHOOTING GUIDE
NO SOUND
Yes
Is sound setting appropriate ?
Is the waveform at pins 7
and 12 of IC1001?
Yes
No
Check speaker.
Is the AUDIO signal at pins
7 and 14 of IC301?
Yes
No
Check IC1001 and peripheral circuit.
Check IC701 and check
AUDIO signal input.
Is the AUDIO signal input
at pins 2 and 19 of IC303?
Yes
No
Check IC303 and peripheral circuit.
Is the AUDIO signal at pins
7 and 14 of IC303?
Yes Check IC301 and
check peripheral circuit.
No

20 No. 52002
AV-14F703
TROUBLESHOOTING GUIDE
NO CCD
Is the video signal at pin
26 of IC101 ?
Is the video signal at
pin 31 of IC701 ?
No
Yes Check IC701 and check
peripheral circuit.
Check IC601 and check
paripheral circuit.
Yes Check IC1001 and check
peripheral circuit.
No