SHARP 35UF6 Service Manual

35UF6
SERVICE MANUAL
COLOR TELEVISION
Chassis No. GB-3U'
MODEL
In the interests of user-safety (Required by safety regulations in some countries ) the set should be restored to its original condition and only parts identical to those specified should be used.
35UF6
CONTENTS
» ELECTRICAL SPECIFICATIONS ......................................................................................................... 1
» IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................. 2
» LOCATION OF USER'S CONTROL .....................................................................................................4
» INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................5
» SERVICE ADJUSTMENT ..................................................................................................................... 9
» CHASSIS LAYOUT .............................................................................................................................12
» BLOCK DIAGRAM ..............................................................................................................................13
» DESCRIPTION OF SCHEMATIC DIAGRAM & WAVEFORMS .......................................................... 14
» SCHEMATIC DIAGRAMS ................................................................................................................... 15
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 24
» REPLACEMENT PARTS LIST ............................................................................................................ 28
» PACKING OF THE SET ......................................................................................................................38
ELECTRICAL SPECIFICATIONS
POWER INPUT ..................................................... 120V AC, 60 Hz
POWER RATING .................................................................. 170W
PICTURE SIZE ..................................... 3,794 cm2 (588.07sq inch)
CONVERGENCE ............................................................. Magnetic
SWEEP DEFLECTION .................................................... Magnetic
FOCUS ............................................... Hi-Bi-Potential Electrostatic
INTERMEDIATE FREQUENCIES
Picture IF Carrier Frequency ..................................... 45.75 MHz
Sound IF Carrier Frequency ...................................... 41.25 MHz
Color Sub-Carrier Frequency .................................... 42.17 MHz
(Nominal)
AUDIO POWER
OUTPUT RATING .............. 5.0W + 5.0W (at 10% distortion and
Dual CH Operate)
SPEAKER
SIZE ........................................................ 12 x 6 cm oval (2 pcs.)
VOICE COIL IMPEDANCE............................... 8 ohm at 400 Hz
ANTENNA INPUT IMPEDANCE
VHF/UHF ..................................................... 75 ohm Unbalanced
TUNING RANGES
VHF-Channels ............................................................... 2 thru 13
UHF-Channels ............................................................14 thru 69
CATV Channels ........................................................... 1 thru 125
(EIA, Channel Plan U.S.A.)
Specifications are subject to change without prior notice.
SHARP CORPORATION
This document has been published to be used for after sales service only. The contents are subject to change without notice.
35UF6
IMPORTANT SERVICE SAFETY PRECAUTION
Ë
Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and the servicing guidelines which follow:
WARNING
1. For continued safety, no modification of any circuit should be attempted.
2. Disconnect AC power before servicing.
3. Semiconductor heat sinks are potential shock hazards when the chassis is operating.
4. The chassis in this receiver has two ground systems which are separated by insulating material. The non­isolated (hot) ground system is for the B+ voltage regulator circuit. The isolated ground system is for the low B+ DC voltages and the secondary circuit of the high voltage transformer. To prevent electrical shock use an isolation transformer between the line cord and power receptacle, when servicing this chassis.
CAUTION: FOR CONTINUED PROTECTION AGAINST A RISK OF FIRE, REPLACE
4A 125V
ONLY WITH SAME TYPE 4A­125V FUSE.
SERVICING OF HIGH VOLTAGE SYSTEM AND PICTURE TUBE
When servicing the high voltage system, remove the static charge by connecting a 10k ohm resistor in series with an insulated wire (such as a test probe) between the pic­ture tube ground and the anode lead. (AC line cord should be disconnected from AC outlet.)
1. Picture tube in this receiver employs integral implosion protection.
2. Replace with tube of the same type number for continued safety.
3. Do not lift picture tube by the neck.
4. Handle the picture tube only when wearing shatterproof goggles and after discharging the high voltage anode completely.
X-RADIATION AND HIGH VOLTAGE LIMITS
1. Be sure all service personnel are aware of the procedures and instructions covering X-radiation. The only potential source of X-ray in current solid state TV receivers is the picture tube. However, the picture tube does not emit measurable X-Ray radiation, if the high voltage is as specified in the "High Voltage Check" instructions. It is only when high voltage is excessive that X­radiation is capable of penetrating the shell of the picture tube including the lead in the glass material. The important precaution is to keep the high voltage below the maximum level specified.
2. It is essential that servicemen have available at all times an accurate high voltage meter. The calibration of this meter should be checked periodically.
3. High voltage should always be kept at the rated value
no higher. Operation at higher voltages may cause a failure of the picture tube or high voltage circuitry and;also, under certain conditions, may produce radiation in exceeding of desirable levels.
4. When the high voltage regulator is operating properly there is no possibility of an X-radiation problem. Every time a color chassis is serviced, the brightness should be tested while monitoring the high voltage with a meter to be certain that the high voltage does not exceed the specified value and that it is regulating correctly.
5. Do not use a picture tube other than that specified or make unrecommended circuit modifications to the high voltage circuitry.
6. When trouble shooting and taking test measurements on a receiver with excessive high voltage, avoid being unnecessarily close to the receiver. Do not operate the receiver longer than is necessary to locate the cause of excessive voltage.
2
2
2
2
IMPORTANT SERVICE SAFETY PRECAUTION
1.5k ohm 10W
0.15µF
TEST PROBE
TO EXPOSED METAL PARTS
CONNECT TO KNOWN EARTH GROUND
(Continued)
35UF6
BEFORE RETURNING THE RECEIVER
(Fire & Shock Hazard)
Before returning the receiver to the user, perform the following safety checks.
1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the receiver.
2. Inspect all protective devices such as non-metallic control knobs, insulating materials, cabinet backs, adjustment and compartment covers or shields, isolation resistor-capacity networks, mechanical insulators, etc.
3. To be sure that no shock hazard exists, check for leakage current in the following manner.
Plug the AC cord directly into a 120 volt AC outlet, (Do not use an isolation transformer for this test).
Using two clip leads, connect a 1.5k ohm, 10 watt resistor paralleled by a 0.15µF capacitor in series with all exposed metal cabinet parts and a known earth ground, such as electrical conduit or electrical ground connected to earth ground.
Use an AC voltmeter having with 5000 ohm per volt, or higher, sensitivity to measure the AC voltage drop across the resistor.
Connect the resistor connection to all exposed metal parts having a return to the chassis (antenna, metal cabinet, screw heads, knobs and control shafts, escutcheon, etc.) and measure the AC voltage drop across the resistor. AII checks must be repeated with the AC line cord plug connection reversed. (If necessary, a non­polarized adapter plug must be used only for the purpose of completing these check.) Any current measured must not exceed 0.5 milliamp. Any measurements not within the limits outlined above indicate of a potential shock hazard and corrective action must be taken before returning the instrument to the customer.
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SAFETY NOTICE
Many electrical and mechanical parts in television receivers have special safety-related characteristics. These characteristics are often not evident from visual inspection, nor can protection afforded by them be necessarily increased by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this manual; electrical components having such features are identified by "å" and shaded areas in the Replacement Parts Lists and Schematic Diagrams.
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3
For continued protection, replacement parts must be identical to those used in the original circuit. The use of substitute replacement parts which do not have the same safety characteristics as the factory recommended replacement parts shown in this service manual, may create shock, fire, X-radiation or other hazards.
35UF6
LOCATION OF USER'S CONTROL
L Location of Controls
Front Panel
POWER
Press On. Press again Off.
SENSOR AREA FOR REMOTE CONTROL
MENU
Press Accesses MAIN MENU. Press again Exits MAIN MENU.
Basic Remote Control Functions
POWER
Press On. Press again Off.
REMOTE KEYPAD
Accesses any channel from keypad.
FLASHBACK
Returns to previous channel.
PERSONAL PREFERENCE
With the Personal Preference buttons, you can program your favorite programs by using the 4 categories A, B, C and D. The channels can be accessed quickly by using these buttons.
VOLUME UP/DOWN
(+) Increases sound. (–) Decreases sound.
• In menu mode, changes or selects the TV adjustments.
MENU
Press Accesses MAIN MENU. Press again Exits MAIN MENU.
CATV/DVD-TV/VCR MODE SELECT SWITCH
In TV/VCR position, sends power and channel select commands (Channel up/down and Random Access buttons) to the TV and VCR control. In CATV/DVD position, sends power and channel select commands to a cable TV converter and DVD control.
DVD/VCR CONTROL
POWER MENU – VOL + CH
POWER MENU – VOL + CH
PULL-OPEN
VOLUME UP/DOWN
(+) Increases sound. (–) Decreases sound.
POWER
TV
DVD VCR
DISPLAY
INPUT
1 2 3
4 5 6
7 8 9
FLASHBACK
PERSONAL PREFERENCE
A B C D
VOL
MENU MUTE
REW PLAY FF
PAUSE
ENTER
0
100
CH
CH
CATV TV
DVD VCR
STOP REC
TV • CATV • VCR • DVD
VOL
+
CH/SKIP
TERMINALS
IN 2VIDEO/AUDIO
(INSIDE DOOR)
CHANNEL UP/DOWN
(8) Selects next higher
channel.
(9) Selects next lower
channel.
• Press both at the same time to access the MAIN MENU screen.
Infrared Transmitter Window
DISPLAY
Press Displays receiving channel for four seconds. Press again Removes display.
• Temporarily displays receiving channel when in Closed Caption mode.
INPUT
Press Switch to external video INPUT 1 mode. Press 2 times Switch to external video INPUT 2 mode. Press 3 times Switch to external video INPUT 3 mode or COMPONENT mode. Press 4 times Switch back to the original TV mode.
ENTER
Used in some instances where a Cable Converter Box requires an “enter” command after selecting channels, when using the REMOTE KEYPAD button.
CHANNEL UP/DOWN
(8) Selects next higher channel. (9) Selects next lower channel.
• Moves the “a” mark of the MENU screens.
MUTE
Press Mutes sound. Press again Restores sound.
• CLOSED CAPTION appears when sound is muted.
Note:
• The above shaded buttons on the Remote Control glow in the dark. To use the glow-in-the-dark display on the remote control, place it under a fluorescent light or other lighting.
• The phosphorescent material contains no radioactive or toxic material, so it is safe to use.
• The degree of illumination will vary depending on the strength of lighting used.
• The degree of illumination will decrease with time and depending on the temperature.
• The time needed to charge the phosphorescent display will vary depending on the surrounding lighting.
• Sunlight and fluorescent lighting are the most effective when charging the display.
4
35UF6
INSTALLATION AND SERVICE INSTRUCTIONS
Note: (1) When performing any adjustments to resistor controls and transformers use non-metallic
screwdrivers or TV alignment tools.
(2) Before performing adjustments, the TV set must be on at least 15 minutes.
CIRCUIT PROTECTION
The receiver is protected by a 4.0A fuse (F701), mounted on PWB-A, wired into one side of the AC line input.
X-RADIATION PROTECTOR CIRCUIT TEST
After service has been performed on the horizontal deflection system, high voltage system, B+ system, test the X-Radiation protection circuit to ascertain proper operation as follows:
1. Apply 120V AC using a variac transformer for accurate input voltage.
2. Allow for warm up and adjust all customer controls for normal picture and sound.
3. Receive a good local channel.
4. Connect a digital voltmeter to TP651 (Pin 3) and make sure that the voltmeter reads 13.85 ±0.6V DC.
5. Apply external 17.3V DC at TP651 by using an external DC supply, TV must be shut off.
6. To reset the protector, unplug the AC cord and plug the AC cord power on. Now make sure that normal picture appears on the screen.
7. If the operation of the horizontal oscillator does not stop in step 5, the circuit must be repaired before the set is returned to the customer.
HIGH VOLTAGE CHECK
High voltage is not adjustable but must be checked to verify that the receiver is operating within safe and efficient design limitations as specified checks should be as follows:
1. Connect an accurate high voltage meter between ground and anode of picture tube.
2. Operate receiver for at least 15 minutes at 120V AC line voltage, with a strong air signal or a properly tuned in test signal.
3. Enter the service mode and select the service adjustment "V11" and Bus data "01" (Y-mute on, CRT Cut Off).
4. The voltage should be below 35.5kV (at zero beam). If a correct reading cannot be obtained, check circuitry for malfunctioning components. After the voltage test, make Y-mute off to the normal mode.
5
35UF6
For adjustments of this model, the bus data is converted to various analog signals by the D/A converter circuit.
Note: There are still a few analog adjustments in this series such as focus and master screen voltage.
Follow the steps below whenever the service adjustment is required. See "Table-B" to determine, if serv­ice adjustments are required.
1. Service mode
Before putting unit into the service mode, check that customer adjustments are in the normal mode. Use the reset function in the video adjustment menu to ensure customer controls are in their proper (reset) position.
2. Service number selection
Once in the service mode, press the Ch-up or Ch­down button on the remote controller or at the set. The service adjustment number will vary in increments of one, from "V01" to "P08". Select the item you wish to adjust.
3. Data number selection
Press the Vol-up or Vol-down button to adjust the data number.
DATA NUMBER
SERVICE ADJUSTMENT NUMBER
To enter the service mode and exit serv­ice mode.
To enter the service mode manually just press and hold the Vol-down and Ch-up buttons at the same time, plug the AC cord into a wall socket. Now the TV set is switched on and enters the service mode. To exit the service mode, turn the television off by pressing the power button.
CHANNEL
V01
Figure A.
55(085)
2
6
35UF6
A. VCJ IC ADJUSTMENT
SERVICE
NUMBER
V01 PICTURE 0-15 (00h-0Fh) 8 (08h) V02 TINT 0-127 (00h-7Fh) 66 (42h) V03 COLOR 0-127 (00h-7Fh) 56 (38h) V05 BRIGHT 0-127 (00h-7Fh) 64 (40h) V06 R CUT-OFF 64-255 (40h-FFh) 64 (40h) V07 G CUT-OFF 64-255 (40h-FFh) 64 (40h) V08 B CUT-OFF 64-255 (40h-FFh) 64 (40h) V09 G/R DRIVE 0-127 (00h-7Fh) 64 (40h) V10 B DRIVE 0-127 (00h-7Fh) 64 (40h) V11Y-MUTE/V-STOP0-20 (00h)Y-Mute / Holizontal “—” 00 V12SHARP0-63 (00h-3Fh)50 (32h)32 V13 DC RESTORATION 0-3 (00h-03h) 2 (02h) 02 V14 BLACK STRETCH 0-3 (00h-03h) 2 (02h) 02 V15 ABL START POINT 0-3 (00h-03h) 3 (03h) 03 V16 ABL GAIN 0-3 (00h-03h) 2 (02h) 02 V17 γ POINT 0-3 (00h-03h) 0 (00h) 00 V19ENERGY SAVE0-63 (00h-3Fh)63 (3Fh)Offset3F V24 LOW-G 0-255 (00h-FFh) 12 (0Ch) Color Temp. F4 V25 LOW-B 0-255 (00h-FFh) 241 (F1h) Color Temp. E6 V26 ML-G 0-255 (00h-FFh) 0 (00h) Color Temp. FD V27ML-B0-255 (00h-FFh)247 (F7h)Color Temp.F8 V28 HIGH-G 0-255 (00h-FFh) 2 (02h) Color Temp. 01 V29 HIGH-B 0-255 (00h-FFh) 8 (08h) Color Temp. 06 V30 WPL 0-1 1 (01h) 01 V31 RGB CONTRAST 0-63 (00h-3Fh) 59 (3Bh) 3B V34 VSM GAIN 0-3 (00h-03h) 1 (01h) 01 V36 BPF/TOF-INPUT 0-1 0 (00h) External Input 00 V37 CORING 0-1 0 (00h) 00 V38 VSM PHASE 0-1 0 (00h) 00 V39COLOR γ0-10 (00h)00 V40SHARP-INPUT0-63 (00h-3Fh)44 (2Ch)External Input2C V41 TINT-INPUT 0-127 (00h-7Fh) 62 (3Eh) External Input 3E V42 PICTURE-COMPONENT 0-15 (00h-0Fh) 6 (06h) Component Input V43 TINT-COMPONENT 0-127 (00h-7Fh) 62 (3Eh) Component Input 3E V44 COLOR-COMPONENT 0-127 (00h-7Fh) 72 (48h) Component Input 48 V45 BRIGHT-COMPONENT 0-127 (00h-7Fh) 84 (54h) Component Input V46 R CUT OFF-COMPONENT 64-255 (00h-FFh) 64 (40h) Component Input V47 G CUT OFF-COMPONENT 64-255 (00h-FFh) 64 (40h) Component Input V48 B CUT OFF-COMPONENT 64-255 (00h-FFh) 64 (40h) Component Input V49 G/R DRIVE-COMPONENT 0-127 (00h-7Fh) 64 (40h) Component Input V50 B DRIVE-COMPONENT 0-127 (00h-7Fh) 64 (40h) Component Input V51SHARP-COMPONENT0-63 (00h-3Fh)44 (2Ch)Component Input2C V52 TINT-S 0-127 (00h-7Fh) 62 (3Eh) Component Input 3E V53 C-TRAP 0-1 (00h-01h) 0 (00h) 00 V59 AUTO FRESH 0-1 (00h-01h) 0 (00h) 00 V60 SHARP P F 0-1 (00h-01h) 1 (01h) 01 V61 CD MATRIX 0-3 (00h-03h) 2 (02h) 02 V62 B-Y A TT 0-1 (00h-01h) 0 (00h) 00 V63 R-Y A TT 0-1 (00h-01h) 0 (00h) 00 V64 CD MATRIX COMPONENT 0-3 (00h-03h) 0 (00h) Component Input 00 V65 B-Y ATT-COMPONENT 0-1 (00h-01h) 0 (00h) Component Input 00 V66 R-Y ATT-COMPONENT 0-1 (00h-01h) 0 (00h) Component Input 00 V67 BUZZ 0-1 (00h-01h) 1 (01h) 01 V68 RGB ABCL 0-1 (00h-01h) 1 (01h) 01 R01 RF-AGC 0-63 (00h-3Fh) 36 (24h) R03 RF-AGC REF 0-255 (00h-FFh) 170 (AAh) D01 V POSITION 0-7 (00h-07h) 0 (00h) 00 D02 H POSITION 0-31 (00h-1Fh) 15 (0Fh) D03 V SIZE 0-127 (00h-7Fh) 89 (59h) D04 H SIZE 0-63 (00h-3Fh) 36 (24h) D05 V-LINEARITY 0-15 (00h-0Fh) 8 (08h) D06V-S CORRECTION0-15 (00h-0Fh)12 (0Dh)0D D07 EW PARABOLA 0-63 (00h-3Fh) 43 (2Bh) D08 EW TRAPEZIUM 0-63 (00h-3Fh) 36 (24h) D10 AFC GAIN 0-3 (00h-03h) 2 (02h) 02 D11 V EHT 0-7 (00h-07h) 6 (06h) 06 D12H EHT0-7 (00h-07h)6 (06h)06 D13EW CORNER0-31 (00h-1Fh)8(08h)0A D14 EW CORNER BOTTOM 19-81 (13h-51h) 50 (32h) Offset toward D13. 32 D15NOISE DET LEVEL0-3 (00h-03h)0 (00h)00 D18 V CENTERING 0-63 (00-3Fh) 36 (24h) D19 V-AGC 0-1 (00h-01h) 0 (00h) 00
ADJUSTMENT ITEM
RANGE
DATA
INITIAL VALUE
NOTES
Standard value for the self-adjustment
FIXED VALUE (HEX)
AA
7
B. SPECIAL SETTING
SERVICE NUMBER
EX1 FAO VOLUME 0-50 (00h-32h) 36 (24h) 24 EX2CC-POSITION0-127 (00h-7Fh)27 (1Bh) 1C EX3 INT 0-255 (00h-FFh) 122 (7Ah) Interrupt period adjustment. 7A EX4 A-ATT 0-127 (00h-7Fh) 90 (5Ah) 5A EX5 TUNER data 0-3 (00h-03h) 0 (00h) 00 EX6 Think chip-Slice LEVEL 0-255 (00h-FFh) 54 (36h) 12 EX7 RLY DELAY TIME 0-255 (00h-FFh) 0 (00h) For the power control 00 EX8 ADG ON TIME 0-255 (00h-FFh) 10 (0Ah) For the power control 0A
ADJUSTMENT ITEM
RANGE
DATA
NOTES FIXED VALUE
INITIAL VALUE
C. OPTION SETTING
SERVICE
NUMBER
OP1 OPTION1 0-255 (00h-FFh) 245 (F5h) B5 OP2OPTION20-255 (00h-FFh)188 (BCh)3C OP3OPTION30-255 (00h-FFh)15 (0Fh)8F
ADJUSTMENT ITEM
RANGE
DATA
NOTES FIXED VALUE
INITIAL VALUE
D. SOUND ADJUSTMENT
SERVICE
NUMBER
M01 INPUT LEVEL 0-15 (00h-0Fh) 7 (07h) M02MTS VCO0-63 (00h-3Fh)38 (26h) 24 M03FILTER0-63 (00h-3Fh)36 (24h) 22 M04 WIDEBAND 0-63 (00h-3Fh) 28 (1Ch) M05 SPECTRAL 0-63 (00h-3Fh) 23 (17h)
ADJUSTMENT ITEM
RANGE
DATA
NOTES FIXED VALUE
INITIAL VALUE
35UF6
(HEX)
(HEX)
(HEX)
8
A
B
35UF6
Holding down both the VOL-up and CH-up buttons on the TV set at service mode for more than 2 seconds will automatically write the above initial values into IC2101.
PART REPLACED
IC2001
IC201
IC2101
CRT
IC3001
NECESSARY UNNECESSARY
ADJUSTMENT
X
X
X
X
NOTES
X
Data is stored in IC2101. The adjustment is needed to compensate for characteristics of parts
including IC201 and MTS level (M01).
Holding down both the VOL-up and CH-up buttons on the TV set in the service mode for more than 2 seconds will automatically write the above initial values into IC2101 Then perform a complete adjustment.
Adjust items related to picture tube only.
Adjust items related to MTS only (M01~M20).
SERVICE ADJUSTMENT
RF AGC Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service adjustment "R01".
3. Set the data value to point where no noise or beat appears.
4. Select another channel to confirm that no noise or beat appears. Note 1 : You will have to come out of the service
mode to select another channel.
Note 2 : Setting the data to "00" will produce a black
raster.
Screen Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service adjustment "V03" and set the data value to "00" to set the color level to minimum. (Record original data code under adjustment "V03" before changing) You may skip this step, if you selected a B/W picture or monoscope pattern.
3. Select the service adjustment "V11" and adjust the data value to "01", this turn off the luminance signal (Y-mute).
4. Adjust the master screen control until the raster darkens to the point where raster is barely seen.
5. Adjust the service adjustments "V06" red, "V07" green and "V08" blue to obtain a good grey scale with normal whites at low brightness level.
6. Select the service adjustment "V11" and reset data to "00". Select the service adjustment "V03" and reset data to obtain normal color level.
7. For component input, the data value of "V46" red, "V47" green and "V48" blue is adjusted to follow the data value of "V06", "V07" and "V08" respectively.
8. Reset the master screen control to obtain normal brightness range.
White Balance Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service adjustment "V03" and set to "00" (minimum color)(Record original data code under adjustment "V03" before changing). "V03" does not have to be adjusted, if you selected a B/W picture or monoscope pattern.
3. Alternately adjust the service adjustment data of "V09" and "V10" until a good grey scale with normal whites is obtained. (RF Input)
4. For component input, the data value of "V49" and "V50" is adjusted to follow the data value of "V09" and "V10" respectively.
5. Select the service adjustment "V03" and reset data to obtain normal color level.
Sub-picture and Sub-Bright Adjustments
1. Receive the window pattern signal.
RF INPUT (TU51)
2. Get into service adjustment data "V01" and "V05" and set the luminance as shown in figure "A" and "B" as below respectively.
COMPONENT INPUT
3. Get in service adjustment data "V42" and "V45" and set the luminance as shown in figure "A" and "B" as below respectively.
LUMINESCENCE CONFIRMATION
A: 80±10cd/m B: 1.1±0.5cd/m
2
2
9
35UF6
Sub-Tint Adjustment
1. Receive the half color bar signal.
RF INPUT (TU51)
2. Get into Y-Mute by R/C, or by setting the "V11" bus data to "01".
3. Vary the "V02" bus data until the waveform becomes as stated below.
LEVEL
B-AMP Base waveform in step (TP47B)
Sub-Color Adjustment
1. Receive a good local channel.
2. Make sure the customer color control is set to center position .
RF INPUT (TU51)
3. Enter the service mode and select service adjustment "V03".
4. Adjust "V03" data value to obtain a normal color level.
Focus Adjustment
1. Receive a good local channel.
2. Adjust the FOCUS VR of the flyback transformer to make the image as fine as possible.
C. C Display Position Adjustment
1. Receive the lion head pattern signal.
2. Select "EX2" to display the text box.
3. Adjust the "EX2" bus data to let the text box displayed in the center.
DISPLAY OF TEXT BOX
TEXT BOX
| A-B | / 2
Note: Aging for 10 min before adjustment. After the
adjustment of V-center and V-size, re­adjustment for this V-line.
Vertical Phase Adjustment
(SCREEN FORMAT 4:3)
1. Enter the service mode and input data of “00h” on "D01".
2. Adjust "D18" data value so that picture is centered.
3. Input data of "00h" on "D20".
4. Input data of "D34" same as "D18" data.
Horizontal Position Adjustment
1. Receive a good local channel.
2. Enter the service mode and select the service adjustment "D02".
3. Adjust "D02" data value so that picture is centered.
4. Input data of "D21" same as "D02" data.
Horizontal-Size Adjustment
1. Receive a good local channel.
(SCREEN FORMAT 4:3)
2. Enter the service mode and select the service adjustment "D04" for H-size.
3. Adjust the "D04" bus data to get the proper H-size.
4. Input data of "D23" same as "D04" data.
EW-Parabola
1. Receive a good local channel.
(SCREEN FORMAT 4:3)
2. Enter the service mode and select the service adjustment "D07" for EW parabola.
3. Adjust the "D07" bus data to get the proper vertical straight line for both left and right side.
4. Input data of "D26" to mines 16 step from "D07" data.
A
SPEC INSPECTION:| A-B | / 2
B
<
5mm
=
Vertical-Size and Linearity Adjustments
1. Receive a good local channel. (SCREEN FORMAT 4:3)
2. Enter the service mode and select the service adjustment "D03" for V-size.
3. Adjust the "D03" bus data to get the proper V-size.
4. For V-linearity adjustment, select data bus "D05" and adjust to get the proper vertical linearity.
5. Input data of "D22" to mines 38 step from "D03” data. (V-SIZE)
6. Input data of "D24" same as "D05" data. (V-LIN)
EW-Trapezium
1. Receive a good local channel. (SCREEN FORMAT 4:3)
2. Enter the service mode and select the service adjustment "D08" for EW-Trapezium.
3. Adjust the "D08" bus data to get the best position display.
4. Input data of "D27" same as "D08" data.
10
Ë
MTS ADJUSTMENT
MTS Level Adjustment
1. Set the sound volume above 1. Monoral signal: 400Hz, 100% modulation
2. Confirm "EX4" data is "5Ah".
3. Vary the "M01" bus data until the voltage to pin (39) of IC3001 to become the value as stated below. SETTING VOLTAGE
ADJ spec : 490±10mVrms CHK spec: 490±20mVrms
MTS VCO Adjustment
1. Keep the unit in no-signal state.
2. Connect the frequency counter to pin (39) of IC3001.
3. Connect a capacitor (100µF, 50V) in between positive(+) side of C3005 and ground.
4. Enter the service mode and select the service adjustment "M02"
5. Adjust the data so that the frequency counter reads
62.94 ±0.75kHz.
35UF6
Filter Adjustment
1. Feed the following stereo pilot signal to pin (14) of IC3001 at C3005 open. Stereo pilot signal: 9.4kHz, 600mVrms.
2. Enter the service mode and select the service adjustment "M03".
3. Adjust the data until "OK" appears in position on the screen. Make sure the "OK" is displayed almost at the center of the data range.
Separation Adjustment
1. Input "SIGNAL 1" and vary the "M04" bus data to get the minimun AC voltage to pin (39) of IC3001.
2. Input "SIGNAL 2" and vary the "M05" bus data to get the minimun AC voltage to pin (39) of IC3001. SIGNAL 1: SIGNAL 2: 3kHz, 30% modulation, Lch only, NR-ON
Note: SIGNAL 1 Adj. for widebando
SIGNAL 2 Adj. for spectral Check the output of the speaker at the maximum volume as stated below. Confirmation spec:
ADJ spec: above 25 dB
CHK spec: above 20 dB
300Hz, 30% modulation, Lch only, NR-ON
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35UF6
CHASSIS LAYOUT
H
G
F
E
D
C
B
A
654321
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