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AV-14F704
SERVICE MANUAL
COLOR TELEVISION
AV-14F704
1 2 3
4 5 6
7 8 9
0
CH
VOL VOL
CH
CONTENTS
q SPECIFICATIONS .............................................................................................................................................. 2
q OPERATING INSTRUCTIONS (APPENDIX)
q SAFETY PRECAUTIONS .................................................................................................................................. 3
q SPECIFIC SERVICE INSTRUCTIONS .............................................................................................................. 4
q SERVICE ADJUSTMENTS ................................................................................................................................ 8
q GUIDE FOR REPAIRING ................................................................................................................................. 13
q STANDARD CIRCUIT DIAGRAM ................................................................................................................... 2-1
q PARTS LIST ..................................................................................................................................................... 19
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD. No. 52130
2003/05
AV-14F704
SPECIFICATIONS
TELEVISION
Picture Tube: 14" (measured diagonally)
Color System: NTSC
TV RF System: US System 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/CATV 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 șC ~ 60 șC
Operating Temperature 5 șC ~ 40 șC
Accessories:
Remote Control X 1
Batteries (UM-3) X 2
Design & specification are subject to change without notice.
2 No. 52130
AV-14F704
SAFETY PRECAUTIONS
SERVICING NOTICES ON CHECKING
1. KEEP THE NOTICES 6. AVOID AN X-RAY
As for the places which need special attentions, they are Safety is secured against an X-ray by considering about the
indicated with the labels or seals on the cabinet, chassis and cathode-ray tube and the high voltage peripheral circuit, etc.
parts. Make sure to keep the indications and notices in the Therefore, when repairing the high voltage peripheral circuit,
operation manual. use the designated parts and make sure not modify the
circuit.
2. AVOID AN ELECTRIC SHOCK Repairing except indicates causes rising of high voltage, and
There is a high voltage part inside. Avoid an electric shock it emits an X-ray from the cathoderay tube.
while the electric current is flowing.
7. PERFORM A SAFETY CHECK AFTER SERVICING
3. USE THE DESIGNATED PARTS Confirm that the screws, parts and wiring which were
The parts in this equipment have the specific characters of removed in order to service are put in the original positions, or
incombustibility and withstand voltage for safety. Therefore, whether there are the portions which are deteriorated around
the part which is replaced should be used the part which has the serviced places serviced or not. Check the insulation
the same character. between the antenna terminal or external metal and the AC
Especially as to the important parts for safety which is cord plug blades. And be sure the safety of that.
indicated in the circuit diagram or the table of parts as a ! (INSULATION CHECK PROCEDURE)
mark, the designated parts must be used. 1. Unplug the plug from the AC outlet.
2. Remove the antenna terminal on TV and turn on the TV.
4. PUT PARTS AND WIRES IN THE ORIGINAL 3. Insulation resistance between the cord plug terminals and
POSITION AFTER ASSEMBLING OR WIRING the eternal exposure metal [Note 2] should be more than
There are parts which use the insulation material such as a
1M ohm by using the 500V insulation resistance meter
tube or tape for safety, or which are assembled in the condition
[Note 1].
that these do not contact with the printed board. The inside
4. If the insulation resistance is less than 1M ohm, the
wiring is designed not to get closer to the pyrogenic parts and
inspection repair should be required.
high voltage parts.
[Note 1]
Therefore, put these parts in the original positions.
If you have not the 500V insulation resistance meter, use a
Tester.
5. TAKE CARE TO DEAL WITH THE
[Note 2]
CATHODE-RAY TUBE
External exposure metal: Antenna terminal
In the condition that an explosion-proof cathoderay tube is set
Earphone jack
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.
HOW TO ORDER PARTS
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.
IMPORTANT
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.
No. 52130 3
AV-14F704
SPECIFIC SERVICE INSTRUCTIONS
DISASSEMBLY INSTRUCTIONS
3. After one side is removed, pull in the opposite direction to
1. REMOVAL OF ANODE CAP remove the other.
Read the following NOTED items before starting work. NOTE
* After turning the power off there might still be a potential voltage Take care not to damage the Rubber Cap.
that is very dangerous. When removing the Anode Cap, make
sure to discharge the Anode Cap's potential voltage.
INSTALLATION
* Do not use pliers to loosen or tighten the Anode Cap terminal,
this may cause the spring to be damaged. 1. Clean the spot where the cap was located with a small amount of
alcohol. (Refer to Fig. 1-3.)
REMOVAL NOTE
1. Follow the steps as follows to discharge the Anode Cap. Confirm that there is no dirt, dust, etc. at the spot where the cap
(Refer to Fig. 1-1.) was located.
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. Location of Anode Cap
A cracking noise will be heard as the voltage is discharged.
GND on the CRT
Fig. 1-3
2. Arrange the wire of the Anode Cap and make sure the wire is not
twisted.
3. Turn over the Rubber Cap. (Refer to Fig. 1-4.)
Screwdriver CRT
Support
Alligator Clip
GND on the CRT
Fig. 1-1
Fig. 1-4
2. Flip up the sides of the Rubber Cap in the direction of the arrow
4. Insert one end of the Anode Support into the anode button, then
and remove one side of the support.
the other as shown in Fig. 1-5.
(Refer to Fig. 1-2.)
Rubber Cap
CRT Support
Support CRT
Fig. 1-2 Fig. 1-5
5. Confirm that the Support is securely connected.
6. Put on the Rubber Cap without moving any parts.
4 No. 52130
AV-14F704
2. REMOVAL AND INSTALLATION OF 3. When IC starts moving back and forth easily after desoldering
completely, pickup the corner of the IC using a tweezers and
FLAT PACKAGE IC remove the IC by moving with the IC desoldering machine.
REMOVAL (Refer to Fig. 2-3.)
1. Put the Masking Tape (cotton tape) around the Flat Package IC NOTE
to protect other parts from any damage.
Some ICs on the PCB are affixed with glue, so be careful not
(Refer to Fig. 2-1.)
to break or damage the foil of each IC leads or solder lands
NOTE under the IC when removing it.
Masking is carried out on all the parts located within
10 mm distance from IC leads.
Blower type IC
IC
desoldering machine
Masking Tape
(Cotton Tape)
Tweezers
Fig. 2-1
2. Heat the IC leads using a blower type IC desoldering machine.
(Refer to Fig. 2-2.)
NOTE IC
Do not add the rotating and the back and forth directions force Fig. 2-3
on the IC, until IC can move back and forth easily after
desoldering the IC leads completely. 4. Peel off the Masking Tape.
5. Absorb the solder left on the pattern using the Braided Shield
Wire. (Refer to Fig. 2-4.)
Blower type IC NOTE
desoldering machine Do not move the Braided Shield Wire in the vertical direction
towards the IC pattern.
Braided Shield Wire
Soldering Iron
IC Fig. 2-2
IC pattern
Fig. 2-4
No. 52130 5
AV-14F704
INSTALLATION 4. When bridge-soldering between terminals and/or the soldering
1. Take care of the polarity of new IC and then install the new IC amount are not enough, resolder using a Thintip Soldering Iron.
fitting on the printed circuit pattern. Then solder each lead on the (Refer to Fig. 2-8.)
diagonal positions of IC temporarily.
(Refer to Fig. 2-5.)
IC
Thin-tip Soldering Iron
Soldering Iron
Fig. 2-8
5. Finally, confirm the soldering status on four sides of the IC using
a magnifying glass.
Solder temporarily Solder temporarily Confirm that no abnormality is found on the soldering position
and installation position of the parts around the IC. If some
Fig. 2-5 abnormality is found, correct by resoldering.
NOTE
2. Supply the solder from the upper position of IC leads sliding to When the IC leads are bent during soldering and/or repairing,
the lower position of the IC leads. do not repair the bending of leads. If the bending of leads are
(Refer to Fig. 2-6.) repaired, the pattern may be damaged. So, be always sure to
replace the IC in this case.
Soldering Iron
Solder
IC Supply soldering
from upper position
to lower position
Fig. 2-6
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.
Soldering Iron
IC
Braided Shield Wire
Fig. 2-7
6 No. 52130
AV-14F704
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.
Initialization of the factory.
NOTE: Do not use this for the normal servicing.
VOL. (-) MIN 1
If you set a factory initialization, the memories are reset such as the channel setting, and
the POWER ON total hours.
Remocon format selection. (JVC format NEC format)
NOTE: Supplied remocon can not be operated at NEC format.
VOL. (-) MIN 3
(The "N" is always displayed on the monitor.)
Do not use this for the normal servicing.
POWER ON total hours is displayed on the screen.
Refer to the "CONFIRMATION OF HOURS USED".
VOL. (-) MIN 6 Can be checked of the INITIAL DATA of MEMORY IC.
Refer to the "WHEN REPLACING EEPROM (MEMORY) IC".
Writing of EEPROM initial data.
VOL. (-) MIN 8
NOTE: Do not use this for the normal servicing.
Display of the Adjustment MENU on the screen.
VOL. (-) MIN 9
Refer to the "ELECTRICAL ADJUSTMENT" (On-Screen Display Adjustment).
CONFIRMATION OF HOURS USED
POWER ON total hours can be checked on the screen. ADDRESS DATA
Total hours are displayed in 16 system of notation.
NOTE:If you set a factory initialization, the total hours is reset INIT 00 D0 Initial setting content of MEMORY IC.
to "0".
1. Set the VOLUME to minimum. CRT ON 0010 POWER ON total hours.
2. Press both VOL. DOWN button on the set and Channel button = (16 x 16 x 16 x thousands digit value)
(6) on the remote control for more than 1 second. + (16 x 16 x hundreds digit value)
3. After the confirmation of using hours, turn off the power. + (16 x tens digit value)
FIG. 1 + (ones digit value)
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.
NOTE: No need setting for after INI 1F due to the adjustment value.
INI +0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F
00 D0 E8 02 64 5E B3 24 37 39 AC 00 04 40 40 40 7F
10 50 00 00 00 00 16 06 99 28 0F 0D C2 A6 88 43 00
Table 1
1. Enter DATA SET mode by setting VOLUME to minimum.
2. 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.
3. ADDRESS is now selected and should "blink". Using the VOL. +/- button on the remote, step through the ADDRESS until required
ADDRESS to be changed is reached.
4. Press ENTER to select DATA. When DATA is selected, it will "blink".
5. Again, step through the DATA using VOL. +/- button until required DATA value has been selected.
6. Pressing ENTER will take you back to ADDRESS for further selection if necessary.
7. Repeat steps 3 to 6 until all data has been checked.
8. When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.
After the data input, set to the initializing of shipping.
9. Turn on the POWER.
10. Press both VOL. DOWN button on the set and Channel button (1) on the remote control for more than 1 second.
11. After the finishing of the initializing of shipping, the unit will turn off automatically.
The unit will now have the correct DATA for the new MEMORY IC.
No. 52130 7
AV-14F704
SERVICE ADJUSTMENTS
ELECTRICAL ADJUSTMENTS
1. ADJUSTMENT PROCEDURE 2. BASIC ADJUSTMENTS
Read and perform these adjustments when repairing the circuits or 2-1: CONSTANT VOLTAGE
replacing electrical parts or PCB assemblies.
1. Place the set with Aging Test for more than 5 minutes.
CAUTION 2. Set condition is AV MODE without signal.
· Use an isolation transformer when performing any service on this 3. Connect the digital voltmeter to the TP003.
chassis. 4. Adjust the VR502 until the DC voltage is 115 ± 1V.
· Before removing the anode cap, discharge electricity because it
contains high voltage. 2-2: CUT OFF
· When removing a PCB or related component, after unfastening 1. Place the set with Aging Test for more than 15 minutes.
or changing a wire, be sure to put the wire back in its original 2. Activate the adjustment mode display of Fig. 1-1 and press the
position. channel button (01) on the remote control to select "CUT OFF".
· When you exchange IC and Transistor for a heat sink, apply the 3. Adjust the Screen Volume until a dim raster is obtained.
silicon grease on the contact section of the heat sink. Before
applying new silicon grease, remove all the old silicon grease.
2-3: WHITE BALANCE
(Old grease may cause damages to the IC and Transistor.)
NOTE: Adjust after performing CUT OFF adjustment.
Prepare the following measurement tools for electrical
adjustments. 1. Place the set with Aging Test for more than 10 minutes.
1. Oscilloscope 2. Receive the gray scale pattern from the Pattern Generator.
2. Digital Voltmeter 3. Using the remote control, set the brightness and contrast to
3. Multi-Sound Signal Generator normal position.
4. Pattern Generator 4. Activate the adjustment mode display of Fig. 1-1 and press the
channel button (12) on the remote control to select "R. BIAS".
On-Screen Display Adjustment
5. Press the CH. UP/DOWN button on the remote control toselect
1. In the condition of NO indication on the screen. the "R. BIAS", "G. BIAS", "B. BIAS", "B. DRIVE" or "G. DRIVE".
Press the VOL. DOWN button on the set and the Channel button 6. Adjust the VOL. UP/DOWN button on the remote control to
(9) on the remote control for more than 1 second to appear the whiten the R. BIAS, G. BIAS, B. BIAS, B. DRIVE, and G. DRIVE
adjustment mode on the screen as shown in Fig. 1-1. at each step tone sections equally.
7. Perform the above adjustments 5 and 6 until the white color is
looked like a white.
TV
2-4: FOCUS
1. Receive the monoscope pattern.
2. Turn the Focus Volume fully counterclockwise once.
3. Adjust the Focus Volume until picture is distinct.
00 OSD 35 2-5: HORIZONTAL POSITION
1. Receive the monoscope pattern.
Fig. 1-1 2. Using the remote control, set the brightness and contrast to
normal position.
3. Use the Channel UP/DOWN button or Channel button (0-9) on 3. Activate the adjustment mode display of Fig. 1-1 and press the
the remote control to select the options shown in Fig. 1-2. channel button (03) on the remote control to select "H.PHASE".
4. Press the MENU button on the remote control to end the 4. Press the VOL. UP/DOWN button on the remote control until the
adjustments. SHIFT quantity of the OVER SCAN on right and left becomes
minimum.
NO. FUNCTION NO. FUNCTION
00 OSD H 18 CONTRAST MAX 2-6: VERTICAL POSITION
01 CUT OFF 19 CONTRAST CENT
02 H. VCO 20 CONTRAST MIN 1. Receive the monoscope pattern.
03 H. PHASE 21 COLOR MAX 2. Using the remote control, set the brightness and contrast to
04 AFC GAIN 22 COLOR CENT normal position.
05 V. SHIFT 23 COLOR MIN
06 H. SIZE 24 TINT 3. Adjust the VR401 until the horizontal line becomes fit to the
07 V. SIZE 25 SHARPNESS notch of the shadow mask.
08 V. LINEARITY 26 Cb DELAY FINE
09 VS CORRECTION 27 Cr DELAY FINE
10 DRIVE R 28 Cb PEDESTAL ADJ
11 DRIVE B 29 Cr PEDESTAL ADJ
12 R CUT OFF 30 E/W PARABOLA
13 G CUT OFF 31 E/W CORNER
14 B CUT OFF 32 E/W TRAPEZIUM
15 BRIGHT MAX 33 LEVEL
16 BRIGHT CENT 34 SEPARATION1
17 BRIGHT MIN 35 SEPARATION2
Fig. 1-2
8 No. 52130
AV-14F704
2-7: VERTICAL SIZE 2-11: SEPARATION 1, 2
1. Receive the monoscope pattern. Please do the method (1) or method (2) adjustment.
2. Using the remote control, set the brightness and contrast to Method (1)
normal position.
1. Set the multi-sound signal generator for each different Lch and
3. Activate the adjustment mode display of Fig. 1-1 and press the
R-ch frequency (Ex. L-ch=2KHz, R-ch=400Hz) and receive the
channel button (07) on the remote control to select "V. SIZE".
RF.
4. Press the VOL. UP/DOWN button on the remote control until the
2. Connect the oscilloscope to the Audio Out Jack.
SHIFT quantity of the OVER SCAN on upside and downside
3. Activate the adjustment mode display of Fig. 1-1 and press the
becomes 9 ± 2%.
channel button (34) on the remote control to select "SEP1".
4. Press the VOL. UP/DOWN button on the remote control to adjust
2-8: VERTICAL LINEARITY it until the audio output wave becomes a fine sine wave.
NOTE: Adjust after performing adjustments in section 2-7. 5. Press the CH UP button once the set to "SEP 2" mode.
After the adjustment of Vertical Linearity, reconfirm the Then perform the above adjustment 4.
Vertical Position and Vertical Size adjustments.
1. Receive the monoscope pattern. Method (2)
2. Using the remote control, set the brightness and contrast to 1. Set the multi-sound signal generator L-ch=1KHz, R-ch =Non
normal position. input and receive the RF.
3. Activate the adjustment mode display of Fig. 1-1 and press the 2. Connect the oscilloscope to the Audio Out Jack (R-ch).
channel button (08) on the remote control to select "V. LIN". 3. Press the AUDIO SELECT button on the remote control to set to
4. Press the VOL. UP/DOWN button on the remote control until the the stereo mode.
SHIFT quantity of the OVER SCAN on upside and downside 4. Activate the adjustment mode display of Fig. 1-1 and press the
becomes minimum. channel button (34) on the remote control to select "SEP 1".
5. Press the VOL. UP/DOWN button on the remote control to adjust
2-9: LEVEL it until the R-ch output becomes minimum.
1. Receive the VHF HIGH (70dB). 6. Set the multi-sound signal generator L-ch=Non input, R-ch=1KHz
2. Connect the AC voltmeter to the pin 6 of CP101. and receive the RF.
3. Activate the adjustment mode display of Fig. 1-1 and press the 7. Connect the oscilloscope to the Audio Out Jack (L-ch).
channel button (33) on the remote control to select "LEVEL". 8. Activate the adjustment mode display of Fig. 1-1 and press the
4. Press the VOL. UP/DOWN button on the remote control until the channel button (35) on the remote control to select "SEP 2".
AC voltmeter is 75 ± 2mV. 9. Press the VOL. UP/DOWN button on the remote control to adjust
it until the L-ch output becomes minimum.
2-10: OSD HORIZONTAL
1. Activate the adjustment mode display of Fig. 1-1. 2-12: BRIGHT CENTER
2. Press the VOL. UP/DOWN button on the remote control until the 1. Receive the monoscope pattern. (RF Input)
difference of A and B becomes minimum. 2. Using the remote control, set the brightness and contrast to
(Refer to Fig. 2-1) normal position.
3. Activate the adjustment mode display of Fig. 1-1 and press the
channel button (16) on the remote control to select "BRI. CENT".
TV 4. Press the VOL. UP/DOWN button on the remote control until the
white 15% is starting to be visible.
5. Receive the monoscope pattern. (Audio Video Input)
6. Press the TV/VCR button on the remote control to set to the AV
mode. Then perform the above adjustments 2~4.
7. Press the TV/VCR button on the remote control to set to the CS
mode.
00 OSD 35
8. Activate the adjustment mode display of Fig. 1-1 and press the
channel button (16) on the remote control to select "BRI. CENT".
A B 9. Press the VOL. UP/DOWN button on the remote control to set
Fig. 2-1
the same step numbers as the AV.
No. 52130 9
AV-14F704
2-13: TINT/COLOR CENT 2-14: CONTRAST MAX MANUAL
1. Receive the color bar pattern. (RF Input) 1. Activate the adjustment mode display of Fig. 1-1 and press the
2. Connect the oscilloscope to TP024. channel button (18) on the remote control to select "CONT.
3. Using the remote control, set the brightness, contrast, color and MAX".
tint to normal position. 2. Press the VOL. UP/DOWN button on the remote control until the
4. Activate the adjustment mode display of Fig. 1-1 and press the contrast step No. becomes "89".
channel button (24) on the remote control to select "TINT". 3. Receive a broadcast and check if the picture is normal.
5. Press the VOL. UP/DOWN button on the remote control until the 4. Press the TV/VCR button on the remote control to set to the AV
section "A" becomes a straight line mode. Then perform the above adjustments 1~3.
(Refer to Fig. 2-2). 5. Press the TV/VCR button on the remote control to set to the CS
6. Connect the oscilloscope to TP023. mode.
7. Press the CH DOWN button 2 times to set to "COL. CENT" 6. Activate the adjustment mode display of Fig. 1-1 and press the
mode. channel button (18) on the remote control to select "CONT.
8. Adjust the VOLTS RANGE VARIABLE knob of the oscilloscope MAX".
until the range between white 100% and 0% is set to 4.4 scales 7. Press the VOL. UP/DOWN button on the remote control until the
on the screen of the oscilloscope. contrast step No. becomes "72".
9. Press the VOL. UP/DOWN button on the remote control until the
red color level is adjusted to 115 ± 10% of the white level. 2-15: Confirmation of Fixed Value (step No.)
(Refer to Fig. 2-3)
Please check if the fixed values of the each adjustment items are
10. Receive the color bar pattern. (Audio Video Input)
set correctly referring below.
11. Press the TV/VCR button on the remote control to set to the AV
mode. Then perform the above adjustments 2~9. NO. FUNCTION RF/AV/CS
12. Press the TV/VCR button on the remote control to set to the CS 02 H. VCO 03
mode. 04 AFC GAIN 06
13. Activate the adjustment mode display of Fig. 1-1 and press the 05 V. SHIFT 00
channel button (24) on the remote control to select "TINT". 06 H. SIZE 00
14 Press the VOL. UP/DOWN button on the remote control to set 09 VS CORRECTION 42
the same step numbers as the AV. 15 BRIGHT MAX 150
15. Press the CH DOWN button 2 times to set to "COL.CENT" 17 BRIGHT MIN 75
mode. 19 CONTRAST CENT 50
16. Press the VOL. UP/DOWN button on the remote control to set 20 CONTRAST MIN 18
the same step numbers as the AV. 21 COLOR MAX 90
23 COLOR MIN 00
25 SHARPNESS 35
26 Cb DELAY FINE 00
27 Cr DELAY FINE 00
28 Cb PEDESTAL ADJ 08
29 Cr PEDESTAL ADJ 08
30 E/W PARABOLA 31
31 E/W CORNER 31
32 E/W TRAPEZIUM 31
"A"
Fig. 2-2
100%
White 100% RED Level
Fig. 2-3
10 No. 52130
AV-14F704
3-3: STATIC CONVERGENCE
3. PURITY AND CONVERGENCE
NOTE
ADJUSTMENTS Adjust after performing adjustments in section 3-2.
NOTE 1. Receive the crosshatch pattern from the color bar generator.
1. Turn the unit on and let it warm up for at least 30 minutes before 2. Combine red and blue of the 3 color crosshatch pattern on the
performing the following adjustments. center of the screen by adjusting the pair of 4 pole magnets.
2. Place the CRT surface facing east or west to reduce the 3. Combine red/blue (magenta) and green by adjusting the pair of 6
terrestrial magnetism. pole magnets.
3. Turn ON the unit and demagnetize with a Degauss Coil.
3-4: DYNAMIC CONVERGENCE
3-1: STATIC CONVERGENCE (ROUGH ADJUSTMENT) NOTE
1. Tighten the screw for the magnet. Refer to the adjusted CRT for Adjust after performing adjustments in section 3-3.
the position. (Refer to Fig. 3-1)
1. Adjust the differences around the screen by moving the deflec-
If the deflection yoke and magnet are in one body, untighten the
screw for the body. tion yoke upward/downward and right/left.
(Refer to Fig. 3-2-a)
2. Receive the green raster pattern from the color bar generator.
2. Insert three wedges between the deflection yoke and CRT funnel
3. Slide the deflection yoke until it touches the funnel side of the
CRT. to fix the deflection yoke.
(Refer to Fig. 3-2-b)
4. Adjust center of screen to green, with red and blue on the sides,
using the pair of purity magnets.
5. Switch the color bar generator from the green raster pattern to RGB RGB
the crosshatch pattern.
6. Combine red and blue of the 3 color crosshatch pattern on the
center of the screen by adjusting the pair of 4 pole magnets. R
7. Combine red/blue (magenta) and green by adjusting the pair of 6 G
pole magnets. B R
8. Adjust the crosshatch pattern to change to white by repeating
G
steps 6 and 7.
B
UPWARD/DOWNWARD SLANT RIGHT/LEFT SLANT
3-2: PURITY
Fig. 3-2-a
NOTE
Adjust after performing adjustments in section 3-1.
1. Receive the green raster pattern from color bar generator.
2. 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.
3. Move the deflection yoke backward (to neck side) slowly, and WEDGE WEDGE
stop it at the position when the whole screen is green.
4. Confirm red and blue color.
5. Adjust the slant of the deflection yoke while watching the screen,
then tighten the fixing screw.
WEDGE
DEFLECTION YOKE
DEFLECTION YOKE SCREW
WEDGE POSITION
MAGNET SCREW
Fig. 3-2-b
6 POLE MAGNETS
4 POLE MAGNETS
PURITY MAGNETS
Fig. 3-1
No. 52130 11
AV-14F704
4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION)
CRT PCB
CP806
TP024 R805
J801 TP023 R803
CP803 CP802B CP801B
CD801
CD802
CRT
CP801A
CP101
TU001
FB401
CP401
VR401
TP003
W003
VR502
CRT
SPEAKER
CP802A
CP502 L503
CRT
AC IN
CP1001
CD501 J705 J706
J707
MAIN PCB
12 No. 52130
AV-14F704
GUIDE FOR REPAIRING
IC DESCRIPTION
MAIN PCB OEC7093A (IC101)
No. Pin name Symbol I/O Logic Function Option
1 P11/SCL1 AUDIO MUTE O 0 Audio MUTE Output. C-MOS
2 P00/PWM0 EXT MUTE O 1 Audio MUTE Output for external Output. Nch-OD
3 P01/PWM1 VOLUME O 1 Volume PWM output. 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 ON TIME LED O ON-TIMER LED control output. C-MOS
11 P21/AOUT/AD6 S IN I S-connectio input. C-MOS
12 P22/SIN/AD7 Y/C SW O External in select output. C-MOS
13 P23/TIM3 AUDIO SW O Audio in select output. C-MOS
14 P24/TIM2 O C-MOS
15 P25/INT3 OPOWER FAIL I 0 Power failure detector input. C-MOS
16 P26/X CIN DEGAUSS_H O 1 Degauss output. C-MOS
17 P27/X COUT X-RAY_TEST O 1 X-RAY detector input. C-MOS
18 CNVSS CNVSS GND
19 XIN X in I Main Oscillation.
20 XOUT X out 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 (FSC IN) I (Main Clock Occurrence circuit input)
29 PON CONT/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 CLK CONT/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.SENC 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
No. 52130 13
AV-14F704
TROUBLESHOOTING GUIDE
NO POWER
Is the voltage at the point (A) Yes Is the voltage at pin G Yes
in the Figure DC160V ? Check Q502 and associated circuit.
of Q502 DC5V ?
No No
Check Q514 and associated circuit.
T501
A
Yes 5 8
Is the voltage at the point (B)
Check R501 and R541.
in the Figure DC164V ?
D R501
No G
Q502
S IC504
Is the voltage at the point (C) Yes 3 B
Check the rectifying circuit.
in the Figure AC120V ? Q514
No
D501~D504
Is the voltage at the point (E) Yes
Broken wire of L501.
in the Figure AC120V ?
No
C
Is the voltage on both Yes
Broken wire of F501.
ends of S501 AC120V ? L501
No
E
Broken wire of AC cord or check F501
S501.
CD501
14 No. 52130
AV-14F704
NO RASTER
Does the RASTER Yes Yes
appear at maximum Is the voltage of pin 1 of Check the output circuit and
BRIGHT/CONTRAST ? CP801 DC180V ? associated circuit.
No No
Check the 180V line.
Is the high voltage of Yes Is the heater voltage at Yes Contact defects of CRT or CRT
ANODE 27KV~28KV ? pin 4 of J801 AC6.4V ? Socket.
No No
Check the HEATER circuit.
Is collector voltages Yes
of Q405 DC115V and Check FB401 and associated circuit.
Q402 DC27V ?
No
Is the waveform at base Yes Check Q402 and check peripheral
of Q402 normal ? circuit.
No
Is the waveform at pin Yes Check the circuit from pin 8 of
8 of IC601 normal ? IC601 to Q402.
No
Check IC601 and associated circuit.
No. 52130 15
AV-14F704
NO COLOR
Are the waveforms at pins 3, Yes Defect of CRT or contact defects
7 and 9 of J801 normal ? of J801.
No
Are the waveforms at pins 3, Yes Check the output circuit and
4 and 5 of CP802 normal ? associated circuit.
No
Are the waveforms at Yes
pins 14, 15 and 16 of Check R, G, B signal output
IC602 normal ? from IC601 to CP802.
No
Is the pulse of crystal Yes
Check the associated circuit of IC601.
X602 normal ?
No
CHANG X602.
16 No. 52130
AV-14F704
NO VERTICAL
Is the waveform at pin Yes
Check DY.
6 of CP401 normal ?
No
Is the waveform at pin Yes Is the voltage at pin 2 Yes Check IC401 and check the
1 of IC401 normal ? of IC401 25V? peripheral circuit.
No No
Check the 25V line.
Is the waveform at pin Yes Check the circuit from pin 63 of
63 of IC601 normal ? IC601 to pin 1 of IC401.
No
Check the associated circuit of IC601.
No. 52130 17
AV-14F704
NO SOUND
Is sound setting appropriate ?
Yes
Is the waveform at pins 7 Yes
Check speaker.
and 12 of IC1001?
No
Is the AUDIO signal at pins Yes Check IC1001 and
16 and 19 of IC303? check peripheral circuit.
No
Is the AUDIO signal input Yes
Check IC302 and peripheral circuit.
at pins 3 and 30 of IC302?
No
Check IC902 and check
AUDIO signal in put.
NO CCD
Is the video signal at pin Yes Check IC101 and check
26 of IC101 ? peripheral circuit.
No
Is the video signal at Yes Check TU001 and check
pin 17 of TU001 ? peripheral circuit.
No
Check IC601 and check
paripheral circuit.
18 No. 52130
JVC SERVICE & ENGINEERING COMPANY OF AMERICA
DIVISION OF JVC AMERICAS CORP.
www.jvcservice.com(US Only)
JVC CANADA INC.
Head office : 21 Finchdene Square Scarborough, Ontario M1X 1A7 (416)293-1311
(No. 52130)