Text preview for : CT-27D10B_AP338.pdf part of PANASONIC CT-27D10B Full Panasonic TV Color, Service Manual, english language. Original service manual.
Back to : CT-27D10B_AP338.rar | Home
ORDER NO. MTNC000417C1 B5
Color Television Main Manual (NA8)
Panasonic
CT-27D10B CT-27D10UB CT-27D10DB
Models
Chassis
AP338 AP338 AP338
This Service manual is issued as a service guide for the models of the NA8 family listed above. Included in this manual are a set of schematic, block diagrams, functional descriptions, alignment procedures, disassembly procedures, and a complete parts list.
"WARNING! This Service Manual is designed for experienced repair technicians only and is not designed for use by the general public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the product or products dealt with in this Service Manual by anyone else could result in serious injury or death." The service technician is required to read and follow the "Safety Precautions" and "Important Safety Notice" in this Main Manual.
®
Copyright 2000 by Matsushita Electric Corporation of America. All rights reserved. Unauthorized copying and distribution is a violation of law.
Special components are used in this television set which are important for safety. These parts are identified on the schematic diagram by the symbol and printed in BOLD TYPE on the replacement part list. It is essential that these critical parts are replaced with the manufacturer's specified replacement part to prevent X-ray radiation, shock, fire or other hazards. Do not modify the original design without the manufacturer's permission.
Important Safety Notice
An Isolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from AC power line. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal injury from electrical shocks. It will also protect the Receiver from being damaged by accidental shorting that may occur during servicing. When servicing, observe the original lead dress, especially in the high voltage circuit. Replace all damaged parts (also parts that show signs of overheating.) Always Replace Protective Devices, such as fishpaper, isolation resistors and capacitors, and shields after servicing the Receiver. Use only manufacturer's recommended rating for fuses, circuits breakers, etc. High potentials are present when this Receiver is operating. Operation of the Receiver without the rear cover introduces danger for electrical shock. Servicing should not be performed by anyone who is not thoroughly familiar with the necessary precautions when servicing high-voltage equipment. Extreme care should be practiced when Handling the Picture Tube. Rough handling may cause it to implode due to atmospheric pressure. (14.7 lbs per sq. in.). Do not nick or scratch the glass or subject it to any undue pressure. When handling, use safety goggles and heavy gloves for protection. Discharge the picture tube by shorting the anode to chassis ground (not to the cabinet or to other mounting hardware). When discharging connect cold ground (i.e. dag ground lead) to the anode with a well insulated wire or use a grounding probe. Avoid prolonged exposure at close range to unshielded areas of the picture tube to prevent exposure to Xray radiation. The Test Picture Tube used for servicing the chassis at the bench should incorporate safety glass and magnetic shielding. The safety glass provide shielding for the tube viewing area against X-ray radiation as well as implosion. The magnetic shield limits the X-ray radiation around the bell of the picture tube in addition to the restricting magnetic effects. When using a picture tube test jig for service, ensure that the jig is capable of handling 40kV without causing Xray radiation. Before returning a serviced receiver to the owner, the service technician must thoroughly test the unit to ensure that is completely safe to operate. Do not use a line isolation transformer when testing.
General Guidelines
Safety Precautions
metallic part has a return path to the chassis, the reading should be between 240k and 5.2M. If the exposed metallic part does not have a return path to the chassis, the reading should be infinite.
Leakage Current Hot Check (Fig. 1)
Plug the AC cord directly into the AC outlet. Do not use an isolation transformer during the check. Connect a 1.5k 10 watt resistor in parallel with a 0.15µF capacitor between an exposed metallic part and ground. Use earth ground, for example a water pipe. Using a DVM with a 1000 ohms/volt sensitivity or higher, measure the AC potential across the resistor. Repeat the procedure and measure the voltage present with all other exposed metallic parts. Verify that any potential does not exceed 0.75 volt RMS. A leakage current tester (such a Simpson Model 229, Sencore Model PR57 or equivalent) may be used in the above procedure, in which case any current measure must not exceed 1/2 milliamp. If any measurement is out of the specified limits, there is a possibility of a shock hazard and the Receiver must be repaired and rechecked before it is returned to the customer. AC VOLTMETER
COLD WATER PIPE (GROUND)
0.15µF
TO INSTRUMENT'S EXPOSED METAL PARTS
1500,10 W Figure 1. Hot Check Circuit
X-ray Radiation
WARNING: The potential source of X-ray radiation in the TV set is in the High Voltage section and the picture tube. Note: It is important to use an accurate, calibrated high voltage meter. Set the brightness, picture, sharpness and color controls to Minimum. Measure the High Voltage. The high voltage should be 28.30kV ± 1.25kV. If the upper limit is out of tolerance, immediate service and correction is required to insure safe operation and to prevent the possibility of premature component failure.
Horizontal Oscillator Disable Circuit Test
Leakage Current Cold Check
Unplug the AC cord and connect a jumper between the two plug prongs. Measure the resistance between the jumpered AC plug and expose metallic parts such as screwheads, antenna terminals, control shafts, etc. If the exposed -2-
This test must be performed as a final check before the Receiver is returned to the customer. See Horizontal Oscillator Disable Circuit Procedure Check in this manual.
Important Safety Notice . . . . . . . . . . . . . . . . . . 2 Safety Precautions . . . . . . . . . . . . . . . . . 2 Service Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Horizontal Oscillator Disable Circuit . . . . 5
Service Adjustments (Electronic Control). . . . . . . . . . . . . . . . . . 24 Sub-Brightness . . . . . . . . . . . . . . . . . . . Sub-Contrast. . . . . . . . . . . . . . . . . . . . . Tint/Color Adjustment . . . . . . . . . . . . . . Color Temperature Adjustment . . . . . . . Complete Adjustment . . . . . . . . . . . . . . Horizontal Centering . . . . . . . . . . . . . . . MTS Circuit Adjustment . . . . . . . . . . . . Input Level Adjustment . . . . . . . . . . . . . Stereo Separation Adjustment . . . . . . . Clock Adjustment . . . . . . . . . . . . . . . . . Vertical Size . . . . . . . . . . . . . . . . . . . . . 24 24 24 25 25 26 26 26 26 27 27
Receivers Feature Table . . . . . . . . . . . . . . . . . . 6
Location of Controls (Receiver) Receiver Front Control Panel . . . . . . . . . 7 Location of Controls (Remote) EUR511502 . . . . . . . . . . . . . . . . . . . . . . 8
Service Adjustments (Mechanical Controls). . . . . . . . . . . . . . . . 27 VCO Field Adjustment L105 . . . . . . . . . 27 Focus (Part of T551). . . . . . . . . . . . . . . 27
Disassembly for Service . . . . . . . . . . . . . . . . . . 9 Disassembly for CRT Replacement . . . . . . . . . 9 Chassis Service Adjustment Procedures . . . 10 131.0V B+ Voltage Confirmation . . . . . 10 Source Voltage Chart . . . . . . . . . . . . . . 10 High Voltage Check . . . . . . . . . . . . . . . 10 Purity and Convergence Procedures . . . . . . .11 Serviceman Mode (Electronic Controls) . . . . 14 Entering Serviceman Mode . . . . . . . . . Toggle between Modes. . . . . . . . . . . . . Exiting the Serviceman Mode. . . . . . . . Sub-Data Adjustment (B) . . . . . . . . . . . Cut-Off Adjustment (C) . . . . . . . . . . . . . Pin Cushion Adjustment (D) . . . . . . . . . MTS Adjustment (M). . . . . . . . . . . . . . . PIP Adjustment (P) . . . . . . . . . . . . . . . . Options Adjustment (S) . . . . . . . . . . . . Comb Filter Adjustment (X) . . . . . . . . . To Check Purity . . . . . . . . . . . . . . . . . . Helpful Hints . . . . . . . . . . . . . . . . . . . . . 14 14 14 15 15 16 16 17 18 19 20 20
Audio Signal Path Block Diagram . . . . . . . . . 28 Video Signal Path Block Diagram . . . . . . . . . 29 Video-Chroma Signal Path Block Diagram . . 30 IC101 VCJ IN/OUT Pins and Functions . . . . . 31 IC001 MPU IN/OUT Pins and Functions. . . . . 32 Component Identification . . . . . . . . . . . . . . . . 33 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Schematics and Voltages A-Board (Left Portion) . . . . . . . . . .Sheet-1A A-Board (Right Portion) . . . . . . . . .Sheet-2A C-Board . . . . . . . . . . . . . . . . . . . . . .Sheet-1B Waveforms . . . . . . . . . . . . . . . . . . . .Sheet-1B Layouts A & C-Boards. . . . . . . . . . . . . . . . . .Sheet-1B
Instructional Flow Chart for Serviceman Mode . . . . . . . . . . . . . . . . 21
-3-
Service Notes
Note: These components are affixed with glue. Be careful not to break or damage any foil under the component or at the pins of the ICs when removing. Usually applying heat to the component for a short time while twisting with tweezers will break the component loose.
Leadless Chip Component (surface mount)
Chip components must be replaced with identical chips due to critical foil track spacing. There are no holes in the board to mount standard transistors or diodes. Some chips capacitor or resistor board solder pads may have holes through the board, however the hole diameter limits standard resistor replacement to 1/8 watt. Standard capacitor may also be limited for the same reason. It is recommended that identical components be used. Chip resistor have a three digit numerical resistance code - 1st and 2nd significant digits and a multiplier. Example: 162 = 1600 or 1.6k resistor, 0 = 0 (jumper). Chip capacitors generally do not have the value indicated on the capacitor. The color of the component indicates the general range of the capacitance. Chip transistors are identified by a two letter code. The first letter indicates the type and the second letter, the grade of transistor. Chip diodes have a two letter identification code as per the code chart and are a dual diode pack with either common anode or common cathode. Check the parts list for correct diode number.
How to Replace Flat-IC
- Required Tools · · Soldering iron · De-solder braids Magnifier
Iron wire or small awl ·
1. Remove the solder from all of the pins of a Flat-IC by using a de-solder braid.
Flat-IC De-Solder Braid
2. Put the iron wire under the pins of the Flat-IC and pull it in the direction indicated while heating the pins using a soldering iron. A small awl can be used instead of the iron wire.
Iron Wire Awl Soldering Iron
Pull
Soldering Iron
Component Removal
1. Use solder wick to remove solder from component end caps or terminal. 2. Without pulling up, carefully twist the component with tweezers to break the adhesive. 3. Do not reuse removed leadless or chip components since they are subject to stress fracture during removal.
3. Remove the solder from all the pads of the Flat-IC by using a de-solder braid.
Soldering Iron
De-Solder Braid Flat IC
Chip Component Installation
1. Put a small amount of solder on the board soldering pads. 2. Hold the chip component against the soldering pads with tweezers or with a miniature alligator clip and apply heat to the pad area with a 30 watt iron until solder flows. Do not apply heat for more than 3 seconds. Chip Components TYPE SOLDER
c
4. Position the new Flat-IC in place (apply the pins of the Flat-IC to the soldering pads where the pins need to be soldered). Properly determine the positions of the soldering pads and pins by correctly aligning the polarity symbol.
Polarity Symbol
GRADE
CAPS
123
.....
....
5. Solder all pins to the soldering pads using a fine tipped soldering iron.
b e
TRANSISTOR COMMON CATHODE
CAPACITOR 1ST DIGIT 2ND DIGIT MULTIPLIER =1600 = 1.6k
Solder
Soldering Iron
ANODES MH DIODE
SOLDER CAPS
RESISTOR
6. Check with a magnifier for solder bridge between the pins or for dry joint between pins and soldering pads. To remove a solder bridge, use a de-solder braid as shown in the figure below.
De-Solder Braid Solder Bridge Soldering Iron
-4-
Service Notes (Continued)
IMPORTANT: To protect against possible damage to the solid state devices due to arcing or static discharge, make certain that all ground wires and CTR DAG wire are securely connected. CAUTION: The power supply circuit is above earth ground and the chassis cannot be polarized. Use an isolation transformer when servicing the Receiver to avoid damage to the test equipment or to the chassis. Connect the test equipment to the proper ground ( ) or ( ) when servicing, or incorrect voltages will be measured. WARNING: This Receiver has been designed to meet or exceed applicable safety and X-ray radiation protection as specified by government agencies and independent testing laboratories. To maintain original product safety design standards relative to X-ray radiation and shock and fire hazard, parts indicated with the symbol on the schematic must be replaced with identical parts. Order parts from the manufacturer's parts center using the parts numbers shown in this service manual, or provide the chassis number and the part reference number. For optimum performance and reliability, all other parts should be replaced with components of identical specification.
Procedure:
1. Tune in a station to verify that the horizontal is in sync. 2. Obtain a Monoscope pattern or a signal generator crosshatch pattern 3. Connect the voltmeter (-) lead to TPD2 and the (+) lead to TPD1 (junction of D55b anode, R556 & R557). Set Bright level to (0) and Picture for a 1.8 volt reading on the voltmeter. 4. Turn the Receiver OFF. Connect a jumper across IC803 pin 3 and pin 4. Apply +9V DC to cathode of D001. 5. Reduce the AC supply voltage to approximately 45V. Connect the high voltage meter to the CRT anode. (H.V. button). Note: Use the Dag Ground (C10 on the CRT Board) to connect the (-) lead of the meter. 6. Turn the Receiver ON. Slowly increase the AC supply voltage and verify that the high voltages does not exceed 37.1kV when horizontal; just begins to pull out of sync. If the high voltage is not within the specified limit, the cause must be determined and corrected before the Receiver is returned to the customer.
Horizontal Oscillator Disable Circuit
This chassis employs a special circuit to protect against excessive high voltage and beam current. If, for any reason, the high voltage and beam current exceed a predetermined level this protective circuit activates and detunes the horizontal oscillator that limits the high voltage. The over-voltage protection circuit is not adjustable. However, if components indicated by the symbol on the schematic in either the horizontal sweep system or the over-voltage protection circuit itself are changed, the operation of the circuit should be checked using the following procedure: Equipment needed to check the disabled circuit: 1. Voltmeter (0 - 200V scale) 2. High Voltage Meter (0- 50kV) 3. Variac or Isolation Transformer
-5-
Receiver Feature Table
FEATURE\MODEL Chassis Tunning system # of channels Menu language Closed Caption V-Chip 75 input Remote Model # Picture tube Black Face Regular Tube Comb Filter H. Edge Correction V/A norm Color Temp MTS/SAP/DBX BASS/BL/TRE Control AI Sound Surround Built-in audio power # of speakers A/V in (rear/front) S-VHS Input (rear/front) Component Input (Y,Pb,Pr) Audio Out (FAO: F, VAO: V) Headphone Jack Dimensions (WxDxH) Weight (kg/lbs) Power source (V/Hz) Anode voltage Video input jack Audio input jack A-Board TNP2AH017 C-Board TNP2AA047 mm in CT-27D10B/UB NA8 96K 181 Eng/Span/Fr X X X EUR511502 M68LGL061X X 3 Line Digital X X X X X X X 5Wx2 (10%) 2 3(2/1) 1/0 1 F,V Mini plug 665.2x544.5x594.8 26.2x21.5x23.5 35/77.2 120/60 28.30kV ± 1.25kV 1Vp-p 75, phono jack 500mV RMS 47k NIL AP CT-27D10DB NA8 96K 181 Eng/Span/Fr X X X EUR511502 M68LGL061X X 3 Line Digital X X X X X X X 5Wx2 (10%) 2 3(2/1) 1/0 1 F,V Mini plug 665.2x544.5x594.8 26.2x21.5x23.5 35/77.2 120/60 28.30kV ± 1.25kV 1Vp-p 75, phono jack 500mV RMS 47k NIL AP
Table 1. Receiver Features
Specifications are subject to change without notice or obligation. Dimensions and weights are approximate.
-6-
Location of Controls (Receiver)
1
2
3
4
5
Remote Control Sensor
Front A/V Input
Figure 2. Location of Controls (Receiver).
Quick Reference Control Operation
Quick Reference Control Operation
1 2
Power Button - Press to turn ON or OFF. Volume Buttons - Press to adjust Sound Level, or to adjust Audio Menus, Video Menus, and select operating features when menus are displayed Channel Buttons - Press to select programmed channels. Press to highlight desired features when menus are displayed. Also use to select Cable Converter box channels after programming Remote Control Infra-red codes (the TV/AUX/CABLE switch must be set in CABLE position). Action Button - Press to display Main Menu and access On Screen feature and Adjustment Menus. TV/Video Button - Press to select TV or Video Input.
3
4
5
-7-
Location of Controls (Remote)
REMOTE CONTROL
POWER Press to turn ON and OFF. Presione para ENCENDER y APAGAR. Appuyer pour établir ou couper le contact. TV/VIDEO Press to select TV or Video Mode. Presione para seleccionar la Modalidad de Televisión ó Video. Appuyer pour sélectionner le mode télé ou vidéo. VOL Press to adjust TV sound and navigate in menus. Presione para ajustar el sonido de la Televisión y accesar opciones en los menús. Appuyer pour régler le niveau sonore et se déplacer au sein des menus. MUTE Press to mute sound. Press to access and cancel (CC) Closed Caption. Presione para silenciar el sonido. También presione para activar y cancelar la Modalidad de Subtítulos (CC). Appuyer pour couper le son. Appuyer pour mettre le décodeur de sous-titres (CC) en ou hors circuit. LIGHT Press to light remote control buttons. Presione para iluminar los botones del
control remoto. télécommande.
Appuyer pour éclairer les touches de la TV, VCR, DBS/CBL, DVD Press to select remote operation. Presione para seleccionar el funcionamiento del Control Remoto. Appuyer pour sélectionner le fonctionnement télécommandé. EXIT/GUIDE DBS function buttons. Botones de función DBS. Touches de fonctions DBS. CH Press to select next channel and navigate in menus. Presione para seleccionar el siguiente canal u opción en el menú. Appuyer pour sélectionner le prochain canal et pour se déplacer au sein des menus. ACTION Press to access menus. Presione para accesar los menús. Appuyer pour accéder aux menus. RECALL
"0"~ "9" Press numeric keypad to select any channel. Presione el teclado numérico para seleccionar cualquier canal. Appuyer sur une touche numérique du clavier pour sélectionner un canal.
Press to display time, channel, sleep timer, and other options. Presione para visualizar la Hora (Time), Canal (Channel), Cronómetro de Apagado Automático (Sleep Timer), y otras opciones. Appuyer pour afficher l'heure, le numéro du canal, l'état de la minuterie-sommeil et d'autres options. REW, PLAY, FF, TV/VCR, STOP, PAUSE, REC, VCR/DBS CHANNEL Component function buttons. Botones de función de los componentes. Touches de fonctions d'appareil auxiliaire.
R-TUNE Press to switch to previously viewed channel or video mode. Presione para regresar al canal previamente visto. Appuyer pour revenir au canal précédemment capté.
EUR511502
Figure 3. Location of Controls (Remote). -8-
Disassembly for Service
Back Cover
Remove all the screws marked with an arrow( ) from the back of the Receiver. Note: Screw configuration, type, and number of screws vary depending on the model of the Receiver serviced and the application; various models are covered in this Manual. Use same hardware when reassembling the receiver. · 3 screws at the top edge of the Receiver. · 1 screw at each lower corner of the Receiver. · 1 screw by the AC cord assembly. · 1 screw by the A/V jacks. · 1 screw by the Fly-back assembly.
Disassembly for CRT Replacement
1. Discharge the CRT as instructed in the Safety Precautions (see page 2). 2. Disconnect the yoke (DY) plug, degaussing coil (DEG) plug and the CRT 2nd anode button from the main board. 3. Remove the C-Board from the CRT base and unplug the black wire (CRT dag ground) C10. 4. Disconnect the A11, A12, and Speakers plugs from the A-Board. 5. Lift the Main Chassis (A-Board) and all mounted boards completely out with the CRT Board attached.
CRT Replacement
1. Perform Disassembly for CRT Replacement procedure. 2. Insure that the CRT H.V. Anode button is discharged before handling the CRT. Read the Safety Precautions (see page 2) on handling the picture tube. 3. Remove the components from the CRT neck and place the cabinet face down on a soft pad. 4. Note the original order for the CRT mounting hardware as they are remove from the CRT mounting brackets at each corner of the CRT. 5. Remove the CRT with the degaussing coil and the dag ground braid attached. 6. Note the original locations and mounting of the degaussing coil and the dag ground assembly to insure proper reinstallation on the replacement CRT. To remove and re-mount the degaussing coil: The degaussing coil is held in place by clampers fastened to the CRT corner ears. These clampers must be installed onto the replacement CRT prior to mounting the degaussing coil. To remove and re-mount the dag ground braid: a.Unhook the coil spring from the bottom corners of the CRT ears. b.Release the braid loop from the upper corners of the CRT ears. 7. Mount the dag ground braid on the replacement CRT. Position the degaussing coil with new ties. Dress coil as was on the original CRT. 8. Replace the components on CRT neck and reinstall into cabinet. Verify that all ground wires and circuit board plugs get connected.
A-Board - Main Chassis
1. Slide the chassis completely out of the guide rails. 2. Stand the Receiver on its edge. The underside of the board is completely accessible for component replacement. Note: Some tie-wraps that secure the wire dressings may need to be unfastened for chassis removal.
C-Board - CRT Output Speakers
Plugs into the socket on the CRT neck. Speaker is secured to the cabinet's front with 4 screws. Fastened to the inside of the cabinet front with up to 3 screws.
Keyboard Push Button Assembly
-9-
Chassis Service Adjustment Procedures
All service adjustments are factory preset and should not require adjustment unless controls and/or associated components are replaced. Note: Connect the (-) lead of the voltmeter to the appropriate ground. Use IC803's heat sink when the HOT ground symbol ( ) is used. Otherwise, use COLD ground ( ) -- Tuner shield, IC451's heat sink or FA2.
IC 003 IC 001 SP
Figure 4. A-Board Main Components
IC451
IC 002 IC 551
COLD (
) HOT ( )
Q 501 RL801
IC 6501
IC 2302
IC 552 IC 803
Q 551
T U N E R
IC 101
IC 2361
IC 3001
F801
TPD8
FA1 CLK FA2 DATA TP15
D554 C552 FOCUS SCREEN
TP
TPD9
MOMENTARILY CONNECT A JUMPER FOR ENTERING SERVICE MODE (FA1 to FA2 )
131.0V B+ Voltage Confirmation
1. Set the Bright and the Picture to Minimum by using the Picture Menu. 2. Connect the DVM between C809(+ side) and cold ground ( ). 3. Confirm that B+ voltage is 131.0V ± 2.5V. This voltage supplies B+ to the Horizontal Output & Flyback circuits.
Adjust Picture Menu for normalized video adjustments.
High Voltage Check
1. Select an active TV channel and confirm that horizontal is in sync. 2. Adjust Brightness and Picture using Picture Icon menu so video just disappears. 3. Confirm B+ 131V is within limit. 4. Using a high voltage meter confirm that the High Voltage is 28.30kV ± 1.25kV.
Source Voltage Chart
120V AC line input. Set the Bright and the Picture to Minimum by using the Picture Menu. Use cold ground ( ) for the (-) lead of the DVM.
LOCATION TPD8 TPD9 C552 (+) side IC551 Pin3 D554 Cathode C572 (+) side VOLTAGE 27.4V ± 2V 13.0V ± 2V 8.0V ± 1V 9.0V ± 0.5V 220V ± 15V 5.0V ± 0.25V
- 10 -
Purity and Convergence Procedure
Adjustment is necessary only if the CRT or the deflection yoke is replaced or if the setting was disturbed. The complete procedure consists of: 1. Vertical Raster Shift Adjustment. (Only for Models with Purity/Convergence Assembly with 4 Pairs of Rings). 2. Initial static convergence. 3. Setting the purity. 4. Final static convergence. For a 1-piece assembly (see Fig. 8): Position like tabs of purity devices together at 12 o'clock to reduce any magnetic field effect. (For better results, note part number and look for specifications at Service Center)
When the CRT or the Yoke is Replaced
Place the yoke on the CRT neck (do not tighten the clamp). For a 2-piece assembly (see Fig. 5): Position purity/convergence assembly as shown and tighten clamp snugly. Remove the hot-melt glue seal on assembly and position like tabs of purity device together at 12 o'clock to reduce its magnetic field effect.
R&B Convergence Rings R&B&G Convergence Rings Purity Rings Centered Over G3/G4 Gap
Figure 8. Positioning of Purity/Convergence Assembly (1-piece assembly)
For either assemblies: Turn the Receiver ON. Operate the Receiver for 60 minutes using the first Purity Check field (white screen) to stabilize the CRT. Fully degauss the Receiver by using an external degaussing coil. Slide the deflection yoke back and forth on the neck of the CRT until it produces a near white, uniform raster.
G3
G4
Figure 5. Positioning of Purity/Convergence Assembly
(2-piece assembly)
For models using 4 pairs of rings, place the vertical raster shift tabs at 3 o'clock (90o from the purity and convergence tabs, see Fig. 6 and Fig. 7)
R&B Convergence Rings R&B&G Convergence Rings Purity Rings Centered Over G3/G4 Gap
G3
G4
Vertical Raster Shift Ring
Figure 6.
Positioning of Purity/Convergence Assembly (4 Pairs of Rings)
Vertical Raster Shift Adjustment (Only for Models with Purity/Convergence Assembly with 4 Pairs of Rings). Apply a green pattern with a horizontal line, adjust the Deflection Yoke so that has no tilt, then secure it. Adjust center line of the pattern with the mechanical center of the CRT, this center is determined by two marks at the side edges of the screen. To adjust the line, once the vertical raster shift tabs are place at 3 o'clock to reduce its magnetic field effect (see Fig. 6 and Fig. 7) open the tabs the same angle from the center, until the center line of the pattern becomes a straight line, centered with the marks of the CRT. (see Fig. 9)
Center line from pattern
R&B&G Convergence Rings R&B Convergence Rings Vertical Raster Shift Rings
90o
Mechanical Center Marks
Open the same angle from center
Vertical Raster Shift tabs
Figure 9.
Purity Rings
Figure 7.
Vertical Raster Shift Adjustment (4 pairs of rings assembly)
Positioning of Purity/Convergence Assembly (4 Pairs of Rings)
- 11 -
Initial Center Static Convergence
Connect a dot/cross hatch generator to the Receiver and tune in a signal. Observe misconvergence at center of the screen only. Adjust the R&B pole magnets; by separating tabs and rotating to converge blue with red. Adjust the R&B and R&B&G pole magnets: by separating tabs and rotating to converge blue and red (magenta) with green. Note: Precise convergence not important. at this point is
Final Convergence Procedure (see Fig. 11
through Fig. 13): Note: Vertical size and focus adjustments must be completed prior to performing the convergence adjustment. Connect a dot pattern generator to the Receiver. The Brightness level should not be higher than necessary to obtain a clear pattern. Converge the red and the blue dots at the center of the screen by rotating the R&B pole Static Convergence Magnets. Align The converged red/blue dots with the green dots at the center of the screen by rotating the R&B&G pole Static Convergence Magnets. Melt wax with soldering iron to reseal the magnets. Slightly tilt vertically and horizontally (do not rotate) the deflection yoke to obtain a good overall convergence. If convergence is not reached at the edges, insert permalloy (see following section) from the DY corners to achieve proper convergence. Recheck for purity and readjust if necessary. After vertical adjustment of the yoke, insert wedge at 11 o'clock position, then make the horizontal tilt adjustment. Secure the deflection yoke by inserting two side wedges at 3 and 7 o'clock positions. Apply adhesive between tab (thin portion) of wedge and CRT and place tape over the tab to secure to the CRT.
Purity Adjustment
When the Receiver is in the Serviceman Mode for making electronic adjustments, press the Recall button on the Remote Control to enter Purity Check. (See the Service Adjustments Electronic Controls procedure). Operate the Receiver for 60 minutes using the first Purity Check field (white screen) to stabilize the CRT. Fully degauss the Receiver by using an external degaussing coil. Press the Recall button on the Remote Control again until the Purity Check (green screen) appears. For a 2-piece assembly (see Fig. 5): Loosen the deflection yoke clamp screw and move the deflection yoke back as close to the purity magnet as possible. Adjust the Purity rings to set the vertical green raster precisely at the center of the screen (see Fig. 10).
NOTES: 1. CRT warm up with white screen (three guns activated) is needed to stabilize the shadow mask expansion. 2. Initial center static convergence (roughly centers three gun beams) is required in order to perform purity adjustment.
Permalloy Convergence Corrector Strip (Part No. 0FMK014ZZ)
This strip is used in some sets to match the yoke and CRT for optimum convergence. If the yoke or CRT is replaced, the strip may not be required. First converge the set without the strip and observe the corners.
Figure 10. Green Raster Adjustment
Green Raster
If correction is needed: 1. Place strip between CRT and yoke, in quadrant needing correction. Slowly move it around for desired results. 2. Press adhesive tightly to the CRT and secure with tape.
Slowly move the deflection yoke forward until the best overall green screen is displayed. For a 1-piece assembly (see Fig. 8): Slowly move the deflection yoke and purity rings assembly toward the CRT board and adjust the purity magnet rings to set vertical green raster at center of screen (see Fig. 10). Gradually move the deflection yoke & purity rings forward and adjust for best overall green screen. Continue from here for either assemblies: Tighten the deflection yoke clamp screw. Press the Recall button on the Remote Control again until the purity check (blue screen) and (red screen) appear and observe that good purity is obtained on each respective field. Press the Recall button on the Remote Control again until Purity check (white screen) appears. Observe the screen for uniform white. If purity has not been achieved, repeat the above procedure.
- 12 -
G R B
As the yoke is tilted vertically, the rasters produced by the outside guns rotate in opposite directions.
Figure 11. Vertical Yoke Movement
Raster produced from one of the outside electron beams Raster from the other side electron beam Static convergence magnets are set for center convergence As the yoke is tilted horizontally, one raster gets larger while the other gets smaller Figure 12. Horizontal Yoke Movement
R G B
Static Convergence Magnets Converges R/B with G Purity/Convergence Assembly Clamp Converges R with B
11 o'clock Position
Double sided adhesive tape
3 o'clock Position Yoke Positioning Wedges for Dynamic Convergence 7 o'clock Position Figure 13. Convergence Magnets and Wedges Location
Purity Rings Adj. on Green Raster
Note:
For models using 4 pairs of rings assemblies see Fig. 6 for details
- 13 -
Serviceman Mode (Electronic Controls)
This Receiver has electronic technology using the I²C Bus Concept. It performs as a control function and it replaces many mechanical controls. Instead of adjusting mechanical controls individually, many of the control functions are now performed by using "On Screen Display Menu". (The Serviceman Adjustment Mode.) Note: It is suggested that the technician reads all the way through and understand the following procedure for Entering/Exiting the Serviceman Adjustment Mode; then proceed with the instructions working with the Receiver. When becoming familiar with the procedure, the Flow Chart for Serviceman Mode may be used as a quick guide.
Quick Entry to Serviceman Mode:
At times when minor adjustments need to be done to the electronic controls, the method of Entering the serviceman Mode without removal of the cabinet back is as follows using the Remote Control: 1. Select SET-UP icon and select CABLE mode. 2. Select TIMER icon and set SLEEP time for 30 Min. 3. Press ACTION button 3 times to exit menus. 4. Tune to the Channel 124. 5. Adjust VOLUME to minimum (0). 6. Press the VOL button (decrease) on Receiver. Red "CHK" appears in upper corner.
To toggle between Aging and Serviceman modes:
While the "CHK" is displayed on the left top corner of the CRT, pressing the Action and the Volume Up buttons on the Receiver simultaneously will toggle between the modes. Red "CHK" for Serviceman and yellow "CHK" for Aging. 7. Press the Power Button on the Remote Control to select one of seven Serviceman Adjustment Modes. 1) B= Serviceman VCJ SUB-DATA ADJUSTEMENT. 2) C= Serviceman VCJ CUT-OFF ADJUSTMENT. 3) D= Serviceman PIN CUSHION ADJUSTMENT. 4) M= Serviceman MTS ADJUSTMENTS. 5) P= Serviceman PIP ADJUSTMENT. (Models with PIP only) 6) S= Serviceman OPTIONS ADJUSTMENTS. 7) X = Serviceman COMB FILTER ADJUSTMENT. 8) "CHK" = Normal operation of CHANNEL and VOLUME .
b
a
32 B 0
b
2 215 C 0
a
Note: Only the applicable settings for the Receiver serviced will be available (See a in Fig. 14).
An address Menu appears in the right hand corner of the screen
Figure 14. Serviceman Mode Menu Adjustments.
Exiting the Serviceman Mode:
Press the Action and the Power buttons on the Receiver simultaneously for at least 2 seconds. THE RECEIVER EXITS SERVICEMAN MODE. The Receiver momentarily shuts off; then comes back on tuned to channel 3 with a preset level of sound. Any programmed channels, channels caption data and some others user defined settings will be erased.
IMPORTANT NOTE: Always Exit the Serviceman Mode Following Adjustments.
- 14 -
Press the Power Button on the Remote Control to select the Serviceman Adjustment .
For Adjustments:
1.Press Channel Up/Down on the Remote Control to select one of the available Service Adjustments (a in Fig. 14). Note: Write Down the original value set (b in Fig. 14) for each address before modifying anything. It is easy to erroneously adjust the wrong item. 2.Press Volume Up/Down on the Remote Control to adjust the level of the selected Service Adjustment (b in Fig. 14).
Sub-Data Adjustment B0 B1 B2 B3 B4 B5 CH B6 B7 B8 B9 BA SUB-COLOR SUB-TINT SUB-BRIGHTNESS SUB-CONTRAST SUB-TINT VIDEO SUB-COLOR VIDEO SUB-TINT COMP SUB-COLOR COMP SUB SHARP TV/VIDEO SUB SHARP S-VHS/COMP SUB-CONTRAST FIXED
Default Level 31 31 31 16 16 16 63 31 10 31 15 CH CH
Cut-Off Adjustment C0 C1 C2 CH C3 C4 C5 C6 C7 CUT-OFF R CUT-OFF G CUT-OFF B USER BRIGHTNESS G DRIVE B DRIVE DRIVE C TEMP CONTRAST C TEMP
Default Level 128 128 128 31 64 64 8 5
PW
PW
To D Items. IMPORTANT NOTE:
Always Exit the Serviceman Mode Following Adjustments.
- 15 -
Press the Power Button on the Remote Control to select the Serviceman Adjustment
For Adjustments:
1.Press Channel Up/Down on the Remote Control to select one of the available Service Adjustments (a in Fig. 14). Note: Write Down the original value set (b in Fig. 14) for each address before modifying anything. It is easy to erroneously adjust the wrong item. 2.Press Volume Up/Down on the Remote Control to adjust the level of the selected Service Adjustment (b in Fig. 14).
Pin Cushion Adjustment D0 D1 D2 D3 D4 D5 CH D6 D7 D8 D9 DA H POSITION V SIZE V S CORRECTION V LIN CORRECTION E/W TRAPEZIUM V AGC V POSITION V CENTERING V CENTERING DAC SW V-BLK START PHASE V-BLK STOP PHASE
Default Level 16 31 4 14 8 1 1 63 0 12 14 PW Default Level 33 6 25 PW CH CH
MTS Adjustment M0 CH M1 M2 INPUT LEVEL LOW-LEVEL SEPARATION HIGH-LEVEL SEPARATION
To P Items.
Note: Some adjustments modes may not be available in some models depending on available options.
Always Exit the Serviceman Mode Following Adjustments.
IMPORTANT NOTE:
- 16 -
Press the Power Button on the Remote Control to select the Serviceman Adjustment
For Adjustments:
1.Press Channel Up/Down on the Remote Control to select one of the available Service Adjustments (a in Fig. 14). Note: Write Down the original value set (b in Fig. 14) for each address before modifying anything. It is easy to erroneously adjust the wrong item. 2.Press Volume Up/Down on the Remote Control to adjust the level of the selected Service Adjustment (b in Fig. 14).
PIP Adjustment P0 P1 P2 P3 P4 CH P5 P6 P7 P8 P9 PA PB PC PD PIP COLOR PIP TINT PIP BRIGHTNESS PIP CONTRAST UP 1/9 DOWN 1/9 LEFT 1/9 RIGHT 1/9 UP 1/16 DOWN 1/16 LEFT 1/16 RIGHT 1/16 PIP FREERUN PIP YDL
Default Level 92 54 22 80 26 143 10 101 26 160 10 116 N/A 4 PW CH CH
To S Items.
Note: Some adjustments modes may not be available in some models depending on available options.
Always Exit the Serviceman Mode Following Adjustments.
IMPORTANT NOTE:
- 17 -
Press the Power Button on the Remote Control to select the Serviceman Adjustment
For Adjustments:
1.Press Channel Up/Down on the Remote Control to select one of the available Service Adjustments (a in Fig. 14). Note: Write Down the original value set (b in Fig. 14) for each address before modifying anything. It is easy to erroneously adjust the wrong item. 2.Press Volume Up/Down on the Remote Control to adjust the level of the selected Service Adjustment (b in Fig. 14).
OPTIONS Adjustment S0 S1 S2 S3 S4 CH S5 S6 S7 S8 S9 SA SB SC ABL GAIN ABL POINT RGB BRIGHTNESS RGB GAMMA COLOR GAMMA VSM-G BS POINT CLOCK ADJUST LOUD COMP CAPTION DIG FILTER SW CAPTION SCROLL RGB MATRIX RGB MATRIX COMP
Default Level 3 3 8 1 1 0 7 128 31 0 1 6 5 PW CH CH
To X Items.
Note: Some adjustments modes may not be available in some models depending on available options.
Always Exit the Serviceman Mode Following Adjustments.
IMPORTANT NOTE:
- 18 -
Press the Power Button on the Remote Control to select the Serviceman Adjustment
For Adjustments:
1.Press Channel Up/Down on the Remote Control to select one of the available Service Adjustments (a in Fig. 14). Note: Write Down the original value set (b in Fig. 14) for each address before modifying anything. It is easy to erroneously adjust the wrong item. 2.Press Volume Up/Down on the Remote Control to adjust the level of the selected Service Adjustment (b in Fig. 14).
Comb Filter Adjustment X0 X1 X2 X3 X4 X5 X6 X7 X8 CH X9 XA XB XC XD XE XF X10 X11 X12 CLIP LEVEL CSOK COMB LIMIT COMB CORE COMB RF DELAY COMB VIDEO DELAY COMB VMLM COMB VMCO COMB SHARP COMB VM LEVEL COMB VMPKF H LOCK MODE H LOCK H SEP 1 H SEP 2 SUB H LOCK MODE SUB H LOCK SUB H SEP1 SUB H SEP2
Default Level 152 12 24 41 20 18 90 24 123 255 1 1 70 313 266 0 70 313 266 PW CH CH
To B Items.
Note: Some adjustments modes may not be available in some models depending on available options.
Always Exit the Serviceman Mode Following Adjustments.
IMPORTANT NOTE:
- 19 -
To Check Purity:
Press the Recall Button on the Remote Control when in Serviceman Mode (red "CHK" is displayed) to enter the Purity Field Check Mode.
NORMAL SCREEN
Press Recall again to select desired field.
BLUE SCREEN GRN. SCREEN RED SCREEN WHITE SCREEN
Figure 15. Purity Check Field Mode.
Helpful Hints Entering Serviceman Mode (Back-Open Method)
1. While the Receiver is ON and operating in Normal Mode, momentarily short test point FA1 (TP8) to Cold Ground ( ) FA2 (TP3) A-Board. The Receiver enters the Aging Mode. Yellow letters "CHK" appear in the upper left corner of the CRT. (The Volume Up/Down will adjust rapidly). 2. Simultaneously press the Action and the Volume Up buttons on the Receiver Control Panel. The Receiver enters the Serviceman Mode. The letter in "CHK" turn red. (The Volume Up/Down will adjust normally). (All customer controls are set to nominal level).
Always Exit the Serviceman Mode Following Adjustments.
IMPORTANT NOTE:
- 20 -
Instructional Flow Chart for Serviceman Mode
Always Exit the Serviceman Mode Following Adjustments.
IMPORTANT NOTE:
NORMAL MODE
Momentarily short FA1 to FA2 (
).
AGING MODE
WHITE SCREEN · · ·
RECALL
(ON REMOTE)
Yellow "CHK" appears in upper left corner of screen. Volume Up/Down operate rapidly. Costumer Controls are set to nominal level. QUICK ENTRY TO SERVICEMAN MODE
Select CABLE Mode. Set SLEEP time for 30 Min. Tune to Channel 124. Adjust Volume to minimum. Press VOL DOWN. On Receiver.
EXIT
N
Adj. needed?
Y
· · · · ·
Press Action + Volume Up Simultaneously (ON Receiver)
GRN. SCREEN
BLUE SCREEN
SERVICEMAN MODE
· · · "CHK" turns red. Volume Up/Down operate normally. Costumer Controls are set to nominal level.
C
RED SCREEN
WHITE SCREEN
RECALL
(ON REMOTE)
Adj. N needed?
EXIT
Press Action and Power on the Receiver simultaneously for at least 2 seconds.
Y
POWER
(ON REMOTE)
CH
ON REMOTE CONTROL TO SELECT ADJUSTMENT ON REMOTE TO ADJUST THE LEVEL
SUB-DATA ADJUSTMENTS. B ITEMS.
VOL VOL
POWER
(ON REMOTE)
A
Figure 16. Flow Chart for Serviceman Mode.
- 21 -
Instructional Flow Chart for Serviceman Mode - Continued
A
CUT-OFF ADJUSTMENTS. C ITEMS.
CH
ON REMOTE CONTROL TO SELECT ADJUSTMENT ON REMOTE TO ADJUST THE LEVEL
Y
Adj. needed?
VOL VOL
N
POWER
(ON REMOTE)
PINCUSHION ADJUSTMENTS. D ITEMS.
CH
ON REMOTE CONTROL TO SELECT ADJUSTMENT ON REMOTE TO ADJUST THE LEVEL
Y
Adj. needed?
VOL VOL
N
POWER
(ON REMOTE)
Always Exit the Serviceman Mode Following Adjustments.
IMPORTANT NOTE:
MTS ADJUSTMENTS. M ITEMS.
CH
ON REMOTE CONTROL TO SELECT ADJUSTMENT ON REMOTE TO ADJUST THE LEVEL
Y
Adj. needed?
VOL VOL
N
POWER
(ON REMOTE)
B
Figure 17. Flow Chart for Serviceman Mode (cont).
- 22 -
Instructional Flow Chart for Serviceman Mode - Continued
B
PIP ADJUSTMENTS. P ITEMS.
ON REMOTE CONTROL TO SELECT ADJUSTMENT ON REMOTE TO ADJUST THE LEVEL
CH
Y
Adj. needed?
VOL VOL
N
POWER
(ON REMOTE)
OPTIONS ADJUSTMENTS. S ITEMS.
ON REMOTE CONTROL TO SELECT ADJUSTMENT ON REMOTE TO ADJUST THE LEVEL
CH
Y
Adj. needed?
VOL VOL
N
POWER
(ON REMOTE)
COMB-FILTER ADJUSTMENTS. X ITEMS.
CH
ON REMOTE CONTROL TO SELECT ADJUSTMENT ON REMOTE TO ADJUST THE LEVEL
Y
Adj. N needed?
POWER
(ON REMOTE)
VOL VOL
N
C
EXIT
Press Action and Power on the Receiver simultaneously for at least 2 seconds.
Figure 18. Flow Chart for Serviceman Mode (cont).
Note: Some adjustments modes may not be available in some models depending on available options.
IMPORTANT NOTE: Always Exit the Serviceman Mode Following Adjustments.
- 23 -
Service Adjustments (Electronic Controls)
Sub-Brightness
Serviceman DAC Adjustment (B2) Adjustment of this control is important for setting proper operation of customer brightness and picture controls. This adjustment must be made after Sub-Contrast or Color Temperature adjustments are made. Do not adjust SCREEN after the Sub-Brightness is set. Preparation: Apply a color bar signal wit 100 IRE white and 7.5 IRE black. (Switch Color to "OFF" on the signal generator.) Operate the Receiver for a minimum of 10 minutes prior to performing this adjustment. Procedure: In the Serviceman Mode for making electronic adjustments, select the DAC adjustment (B2) and adjust until the black starts to look gray. Then decrease the level to the point where gray turns to black. Note: You may set the accurate value following the Preparation steps and the Procedure step No. 2 of the Sub-Contrast adjustment described below. Procedure: 1. In the Serviceman Mode, select DAC SubBrightness Adjustment (B2) and adjust for 1.51.9Vp-p between blanking and 7.5 IRE level. (See video waveforms detail, Fig. 19) 2. In the Serviceman Mode for electronic adjustments, select DAC Sub-Contrast Adjustment (B3) and adjust for 2.0Vp-p ±0.1V white level to black level on video waveform (see video waveforms detail, Fig. 19). 3. Remove the jumper (Preparation step 4).
Tint/Color Adjustment
Serviceman DAC Adjustment (B1) (B0) Preparation: 1. Apply a rainbow color bar signal. 2. Preset the following controls: · Brightness . . . . . . . Min. · Color . . . . . . . . . . . . Center. · Tint . . . . . . . . . . . . . Center. · Picture . . . . . . . . . . Max. · Sharpness . . . . . . . Min. 3. Connect the oscilloscope to TP47B (A-Board). 4. Connect a jumper from TPD2 to GND ( ). 5. Change the value of DAC S3 from 1 to 0. Procedure: 1. In the Serviceman Mode for making electronic adjustments, select DAC Sub-Tint Adjustment (B1). Adjust until the waveform measured is as the one shown in Fig. 20.
TP47B (A-Board)
Sub-Contrast
Serviceman DAC Adjustment (B3) This adjustment is factory set. Do not adjust unless repairs are made to associated circuit, the CRT Board or when the CRT is replaced. Preparation: 1. Apply a color bar signal pattern with 87.5% modulation, 70% saturated color bar with a 100 IRE white and 7.5 black. Note: The pattern used in this procedure is an EIA color
bar pattern with 87.5% modulation with 100 IRE white and 7.5 black. Correlate the information in this procedure to the pattern used if another signal is used.
A C 123
B 10
A to B = 1 unit B to C = 2 units
456789
2. Preset the following controls: · Brightness. . . . . . . . Center. · Color . . . . . . . . . . . . Min. · Picture . . . . . . . . . . Max. · Sharpness . . . . . . . Center. 3. Connect the oscilloscope to TP47R. Set the scope time base to 20µs (horizontal). 4. Connect a jumper from TPD2 to ground ( )..
White Yellow Cyan Green Magenta Red
Figure 20. TP47B waveform 2. Connect the oscilloscope to TP47G (A-Board). 3. Select DAC Sub-Color Adjustment (B0) and adjust for peak to peak amplitude to be 0.65Vp-p ±0.05V for 27" models as shown in Fig. 21.
TP47G (A-Board)
1 2 3 4 5 6 7 8 9 10
0.65Vp-p±0.05V
2.0Vp-p ±0.1V
Blue Black SYNC TIP
Figure 21. TP47G waveform 4. Remove the jumpers (Preparation steps 4 & 5).
1.5V - 1.9V p-p
Figure 19. TP47G waveform - 24 -
Service Adjustments (Electronic Controls, cont.)
Color Temperature Adjustment (B/W Tracking)
Serviceman DAC Adjust. (C0) (C1) (C2) (C4) (C5) Minor Touch-Up Method OBSERVE low and high brightness areas of a B/W picture for proper tracking. Adjust only as required for "good gray scale and warm highlights". 1. LOW LIGHT areas In Serviceman Mode for making electronic adjustments, select Cutoff (C0) RED, (C1) GRN, (C2) BLU and adjust the picture for gray. 2. HIGH LIGHT areas In Serviceman Mode for making electronic adjustments, select Drive (C4) GRN, (C5) BLU and adjust the picture for warm whites. 8. View scope trace at Horizontal rate and adjust the Serviceman Mode DAC (C0) level until a scanning period of 195V above DC ground is measured, as indicated in Fig. 23. 9. Connect the scope to the GRN Cathode (KG). 10. In Serviceman Mode for making electronic adjustments, select the GRN CUTOFF DAC (C1). 11. Press the R-Tune key on the Remote
195V DC 0V DC (Ground) Figure 23. Cathode Waveform, Adjustment Waveform Detail 12. View the scope trace and adjust the Serviceman Mode DAC (C1) for the scanning period to be 195V above DC ground. (See Fig. 23) 13. Connect the scope to the BLU Cathode (KB). 14. In Serviceman Mode for making electronic adjustments, select the BLU CUTOFF (C2). 15. Press the R-Tune key on the Remote. 16. View the scope trace and adjust the Serviceman Mode DAC (C2) for the scanning period to be 195V above DC ground. (See Fig. 23) 17. Turn the Screen Control (part of FBT) slowly clockwise until a color horizontal line appears. 18. With the other two colors Serviceman Mode DAC CUTOFF adjustments (C0) RED, (C2) BLU; increase the colors to create a white horizontal line. 19. Confirm that a good gray scale is established by viewing B/W color bar pattern. 20. In the Serviceman Mode for making electronic adjustments select the DAC DRIVE adjustments (C4) GRN, (C5) BLUE and adjust for warm white in a white color bar pattern. 21. EXIT the Serviceman Mode. 22. Adjust the Picture Menu Video Adjustments Bright and Picture from low scale to high scale and check Black and White tracking. 23. If correction is needed: Re-Enter the Serviceman Mode and perform the Minor Touch Up Method. 24. Perform Sub-Brightness Adjustment procedure if needed.
Complete Adjustment
Preparation: 1. Turn the Receiver "ON" and allow 10 minutes warm up at high brightness. 2. Apply a color bar signal with color "OFF". 3. Turn the SCREEN control (part of FBT T551) fully counterclockwise. Procedure: Preset the following Serviceman DACs for best results: · C0 . . . . . . . . . . . . . .128 · C1 . . . . . . . . . . . . . 128 · C2 . . . . . . . . . . . . . .128 · C4 . . . . . . . . . . . . . . 64 · C5 . . . . . . . . . . . . . . 64 1. Connect the oscilloscope to C1-1 (CRT-Board). 2. In Serviceman Mode for making electronic adjustment, select the Sub-Bright DAC (B2). 3. Press the R-Tune key on the remote. 4. Observe the oscilloscope waveform at Horizontal rate and adjust the Serviceman Mode Sub-Bright DAC (B2) level until a scanning period of 2.5V above DC ground is measured, as indicated in Fig. 22.
2.5V DC
0V DC
Figure 22. TP35 Waveform 5. Connect the scope to RED Cathode (KR) on the CRT-Board. 6. In the Serviceman Mode for making electronic adjustments, select the RED CUTOFF DAC (C0). 7. Press the R-Tune key on the remote.
- 25 -
Service Adjustments (Electronic Controls, cont.)
Horizontal Centering
Serviceman DAC Adjustment (D0) Preparation: Connect a monoscope pattern generator. Procedure: 1. In the Serviceman Mode for making electronic adjustments. Select the Horizontal Centering Adjustment DAC (D0) and adjust until the center of the monoscope pattern is centered on CRT. 2. EXIT the Serviceman Adjustment Mode.
Stereo Separation Adjustment (M1 & M2)
Preparation: 1. Connect an RF signal generator to the RF antenna input. 2. Connect a scope to TPE10. Procedure: 1. Select Stereo Mode in Audio menu 2. Apply the following signal from the RF signal generator: Video: 100 IRE flat field, 30% modulation. Audio: 300Hz, 100% modulation, stereo (left only) (70 ±5dB, 75 OPEN, P/S 10dB). 3. Adjust the MTS Low-Level Separation Adjustment (M1) until the amplitude displayed on the scope is minimum. 4. Apply the following signal from the RF signal generator: Video: 100 IRE flat field, 30% modulation. Audio: 3KHz, 100% modulation, stereo (left only) (70 ±5dB, 75 OPEN, P/S 10dB). 5. Adjust the MTS High-Level Separation Adjustment (M2) until the amplitude displayed on the scope is minimum. 6. Repeat above steps 2 through 5 until the amplitude is at minimum for both signals.
MTS Circuit Adjustments
The MTS Circuit Adjustments require two steps: 1. Input Level Adjustment. 2. Stereo Separation Adjustment.
Input Level Adjustment (M0)
Preparation: 1. Connect an RMS meter with filter jig as shown in Fig. 24.
RMS METER TPE11
10k 4700p
Figure 24. Filter Jig
2. Connect an RF signal generator to the RF antenna input. Procedure: 1. Apply the following signal from the RF signal generator: Video: 100 IRE flat field, 30% modulation. Audio: 300Hz, 100% modulation, monaural (70 ±5dB, 75 OPEN, P/S 10dB). 2. Adjust the MTS Input Level Adjustment (M0) until the voltage measured is 106 ± 6.0mV rms.
- 26 -
Service Adjustments (Electronic Controls, cont.)
Clock Adjustment (S7)
Preparation: Connect the frequency counter from TPS1 (IC001 Pin 13) to cold ground ( ). Note: Frequency Counter probe capacitance should be 8pF or less. Procedure: 1. Turn the Receiver "OFF" with the AC power applied. 2. Measure TPS1 (IC001 pin 13) for the frequency of the waveform and record the reading. Note: Pin 13 measurement must have at least four digits of resolution following the decimal point. Example: 000.0000 5. Calculate and following formula: set Sb based on the
6 { 244.1406 pin13 [ Hz ] } Sb = 128 + 0.901 ×10 ----------------------------------------------------------------244.1406 Note: Pin 13 measurement will not regardless of the value stored in Sb. change
Vertical Size (D1)
1. Adjust the VERTICAL SIZE DAC control, D1, until the top and the bottom edges of the raster are visible. 2. Adjust the VERTICAL SIZE control, D1, until the top and the bottom of the raster touch the bezel edge. The advance SIZE control to obtain an approximately 10% overscan. Linearity adjustment is don automatically when the size is being adjusted. (Best results can de obtained with a round test patter.)
3. Turn the Receiver back "ON". 4. Place the Receiver into Serviceman Mode for making electronic adjustment, select the Clock Adjustment DAC (S7).
Service Adjustments (Mechanical Controls)
Focus (part of T551)
Preparation: Connect a Signal generator and select a dot pattern. Procedure: Adjust the FOCUS control to obtain the sharpest and clearest dot pattern. a. Adjust for best center. b. Adjust for best area between the center and top right corner.
- 27 -
A
IC2201 MTS AN5849S-E1V
C 2324
Tuner
MPX In L Out R Out
14
21
LRF1 RRF1 VCC
22
JK3002 L-AV3
35 1 11
+ L Out
33
Front A/V Input 3
L R-AV3
13 15
R-Mode1 R Out
IC2351 Bass/Tre/ Bal/ Surr CXA2021S IC2302 Audio Out AN5272 7
R In
JK3002 7 6 2 3 R Out 4
R
9 28
R In
2 3
VOL L In
L-AV1
3 1
L Out
R M L
JK3001 R-AV1
A/V Input 1 L-AV2
L R
8
L-Mode1 L M L-SW1 I2C Control SCL1 SDA1 R Q2409
14 30 22
L In VAO L
5
A/V Input 2 R-AV2
L2
R2
10
VAO R
4 IC001 Vol 14 MPU MN101C46FTA 2
SDA1 SCL1 S-Defeat D2343
1
IC3001 A/V SW M52790SP 17 18
Audio Signal Path Block Diagram
Figure 25. Audio Signal Path Block Diagram.
3 17
Q2410
JK3004
L
Variable Audio Out
R
-
- 28 5
R-SW1
+
12
5 1 Headphone Jack
R OUT 8
L OUT
C2321
A
Tuner IC6501 Comb Filter MN82840 18
Y In
JK3001
Y/V1
36
RF1
Video Input 1
PB
PR
2
Video1 V1 Out
Video Input 2
V2
31 22
Y Out
C6529 + C3019 +
Luma In Filter Q6504 Q6509 Q6516
6
Y-YUV Y In
32 24
C Out
7
Video2 Chroma Out Filter Q6514 Q6505 Q6519 Q6501 5V Q603 5V R Out 5V
Luma Out Filter Q6510 Q6506 Q6502
JK3002
Front Video Input 3
V
12 Video3 IC3001 C In 34 A/V SW M52790SP C1 Out 29 45 11
Y-AV2 C-AV2 5V Q201
Chroma In A11-1 C1-1
JK3003
Y
C
13
+
C641 A11-2 C1-2 G Out Sync In
C
38 14
A11-3 B Out C1-3 Q351 Q352 Q353 CRT
+
Video Signal Path Block Diagram
Figure 26. Video Signal Path Block Diagram.
9
Q303
- 29 C315
S-Video
15 6 3
YM/YS In R In
25
CVBS0 YM D014
33
D015
4 5
G In
IC101 VCJ TA1310BN
B In B-Y In R-Y In
YS 29 IC001 R 32 MPU MN101C46FTA G 31 B
53 30
C225
52
C226
Video Input JK3001 V2 FSC PR PB Y/V1
IC6501
X501
12 54 43 SW ACC TOF/BPF 285ns Delay Y Clamp Clamp VCXO CW Amp Killer APC Tint 53 52 50 49
+
46
5V
51 PED Smoothing Black Stretch Black Level Correction INT/EXT SW R-Y/B-Y Demod RGB g Correction G-Y Clamp Half Tone RGB Drive Color Uni-Color R-Y/B-Y Clamp G-Y Matrix Phase Gain Select DC Restoration Ratio Correction VSM Base Band Tint
+
55
+
Burst Blanking 16
9V
56
Video-Chroma Signal Path Block Diagram
Figure 27. Video-Chroma Path Block Diagram..
VSM On/Off SW Half Tone Color RGB Matrix Delay Line Sharpness Sub Contrast Uni-Color Brightnes s WPS 13 Clamp RGB Switch Reverse g COR Cut Off Bias 10
RGB Mute
- 30 RGB Contrast Clamp (RGB Brightness)
VSM Out
1
IC001 MPU
OSD R
32
3
RGB Out BLK
14 15 17 18 19
Q351 Q352 Q353
CRT
OSD G
31
4
OSD B
30
5
YM
33
6
YS
29
IC101 VCJ TA1310BN
ABCL
11
T551 Flyback
IC101 IN/OUT Pins and Functions (VCJ)
IC101 TA1310BN
Verocity Scanning Modulation Ground Red Input Green Input Blue Input RGB/Half Tone In HD Reference Hold Down V Reg Ground Brightness Control NC Red Output Green Output Blue Output VCC 9V Red Cutoff Green Cutoff Blue Cutoff Noise filter NC NC NC Vertical Output Vertical Feedback Automatic Gain Vertical Ramp Vertical EHT Input 1 2 3 4 5 6 7 8 9 VSM Out GND R In G In B In YS / YM In DC RC 56 BP DET 55 Y In 54 B-Y In 53 R-Y In 52 VCJ 51 DC Restoration Correction Black Peak Detection Luminance Signal Input R-Y Input B-Y Input VCC 5V 3.58MHz Clock Output 3.58MHz X-tal NC NC APC Filter Chroma Input Ground Delayed Y Signal Horizontal Correction Horizontal Oscillation AFC1 detection Vertical Separation Video Sync 9V NC Horizontal Output Flyback Pulse Vertical Drive Pulse NC Ground I2C SDA I/0 I2C SCL Input
Hold Down Reference CW Out 50 Hold Down V Reg X-tal 49 R-Y Out 48 B-Y Out 47 APC 46 Chroma In 45 GND 44 DL Out 43 42 Bend Correction 32 fh VCO 41 AFC1 40 V Sep 39 Y/Sync In 38 DEF VCC 37 Sync Out 36 H Out 35 FBP In 34 VD Out 33 HD Out 32 GND 31 SDA 30 SCL 29
10 RGB Mute 11 ABL In 12 VK Out 13 R Out 14 G Out 15 B Out 16 VCC 9V 17 R Filter 18 G Filter 19 B Filter 20 Noise Filter 21 V Centering 22 EW FB 23 EW Out 24 V Out 25 V NFB 26 V AGC 27 V Ramp 28 EHT V
Figure 28. IC101 IN/OUT Pins and Functions (VCJ).
- 31 -
IC001 IN/OUT Pins and Functions (MPU)
IC001 MN101C46FTA3
Remote signal in SDA1 SCL1 AFC1 AFC2 Key Scan 1 Action S-VHS Version FA1 YUV SW +3.3V System Clock Out Volume VCJ +9V SW N.C. Sound Defeat Power Speaker On / Off +3.3V Closed Caption 1 2 3 4 5 6 7 8 9 RMIN P01 P02 ADIN0 ADIN1 ADIN2 ADIN3 P07 ADIN5 VSS 42 OSC1 41 OSC2 40 VDD (VPP) 39 P42 38 P41 37 P40 36 VSYNC 35 NRST 34 YM 33 ROUT 32 GOUT 31 BOUT 30 YS 29 FLASH 28 HSYNC 27 VREFH0 26 CVBS0 25 CVBS1 24 VREF1 23 CLH 22 GND 14.32MHz X-tal 14.32MHz X-tal +3.3V SCL0 SDA0 Not used/open V-Sync NRST YM R Out G Out B Out YS GND H-Sync Closed Caption 0 Closed Caption 0 Closed Caption 1 Closed Caption 1 Closed Caption
10 ADIN6 11 P12 12 MMOD 13 SYSCLK 14 PWM0 15 PWM1 16 P16 17 P17 18 P20 19 PWM5 20 VDD 21 CLL
Figure 29. IC001 IN/OUT Pins and Functions (MPU).
- 32 -
Component Identification
1 Screw 1 Screw
1 Screw
1 Screw 1 Screw 1 Screw
1 Screw
1 Screw
Figure 30. Cabinet Back
- 33 -
Component Identification
CRT (Secured by 4 screws) Anode (High Voltage) Deflection yoke Degaussing Coil
Yoke wedge
Speaker VAO out Tuner S-VHS Input A/V Jacks T551 Flyback
Speaker
Figure 31. Rear View
Note:
After servicing the receiver, remember to dress the cables, as shown above.
- 34 -
Component Identification
A/V front inputs IC001 MPU IC2302 IC002 RL801 Front keypad IC 451
Q501 H-Drive IC6501
IC803 Tuner
Q551
IC101 VCJ
Fuse IC2351 IC3001 A/V Jacks T551 Flyback
Audio out
S-VHS Input
Figure 32. A-Board
CRT Socket
Figure 33. C-Board - 35 -
REPLACEMENT PARTS LIST
Models: CT-27D10B, CT-27D10UB & CT-27D10DB Important Safety Notice: Components printed in BOLD TYPE have special characteristics important for safety. When replacing any of these components use only manufacturer's specified parts.
REF NO. CRA801 CRA802 C001 C002 C003 C005 C006 C008 C010 C013 C016 C017 C018 C020 C021 C022 C024 C025 C026 C032 C033 C034 C036 C043 C044 C047 C048 C201 C224 C225 C226 C301 C302 C303 C307 C309 C310 C314 C315 C320 C321 C322 C323 C324 C330 C331 C337 C342 PART NO. CAPRISTORS TP00842-51 TP00842-51 ECA1CM470 ECJ2VF1H103Z ECA1HM4R7 ECA1CM470 ECJ2VF1H103Z ECJ2VF1H103Z ECJ2VF1H103Z ECA0JM101 ECJ2VC1H101J ECJ2VC1H270J ECJ2VC1H270J ECA0JM331 ECJ2VF1H103Z ECA1CM471 ECA1HM4R7 ECA1HM010 ECA1HM010 ECA1CM331 ECJ2VC1H680J ECJ2VC1H680J ECJ2VC1H101J ECA1HM2R2 ECJ2VF1H103Z ECA0JM102 ECJ2VF1H103Z ECJ2VB1C104K ECJ2VB1C104K ECJ2VB1C104K ECJ2VB1C104K ECJ2VB1C104K ECJ2VB1C104K ECJ2VB1C104K ECA1HM0R1 ECJ2VC1H390J ECJ2VC1H390J EEANA1E1R0B EEANA1E1R0B ECJ2VF1H104Z ECJ2VB1H103K ECJ2VB1H103K ECJ2VB1H103K ECJ2VF1H104Z ECA1AM101 ECJ2VF1H103Z ECA1HM2R2 ECA1HM010 TAPING GAP TERMINAL TAPING GAP TERMINAL CAPACITORS CAP,E 47UF/16V CAP,C .01UF-Z-50V CAP,E 4.7UF/50V CAP,E 47UF/16V CAP,C .01UF-Z-50V CAP,C .01UF-Z-50V CAP,C .01UF-Z-50V CAP,E 100UF/6.3V CAP,C 100PF-J-50V CAP,C 27PF-J-50V CAP,C 27PF-J-50V CAP,E 330UF/6.3V CAP,C .01UF-Z-50V CAP,E 470UF/16V CAP,E 4.7UF/50V CAP,E 1.0UF/50V CAP,E 1.0UF/50V CAP,E 330UF/16V CAP,C 68PF-J-50V CAP,C 68PF-J-50V CAP,C 100PF-J-50V CAP,E 2.2UF/50V CAP,C .01UF-Z-50V CAP,E 1000UF/6.3V CAP,C .01UF-Z-50V CAP,C .1UF-I-16V CAP,C .1UF-I-16V CAP,C .1UF-I-16V CAP,C .1UF-I-16V CAP,C .1UF-I-16V CAP,C .1UF-I-16V CAP,C .1UF-I-16V CAP,E 0.1UF/50V CAP,C 39PF-J-50V CAP,C 39PF-J-50V CAP,E 1.0UF-25V CAP,E 1.0UF-25V CAP,C .1UF-Z-50V CAP,C .01UF-K-50V CAP,C .01UF-K-50V CAP,C .01UF-K-50V CAP,C .1UF-Z-50V CAP,E 100UF/10V CAP,C .01UF-Z-50V CAP,E 2.2UF/50V CAP,E 1.0UF/50V DESCRIPTION REF NO. C351 C352 C353 C354 C357 C401 C402 C403 C404 C405 C407 C409 C415 C451 C452 C453 C454 C455 C456 C457 C458 C459 C502 C503 C504 C505 C506 C507 C508 C510 C511 C512 C514 C515 C516 C517 C518 C531 C551 C552 C553 C554 C555 C556 C557 C558 C560 C561 C562 C563 PART NO. TACCW331T50V TACCW331T50V TACCW331T50V ECKD3D102KB EEANA1E1R0B ECJ2VB1C104K ECA1HM470 ECA1HM010 ECA1HM010 ECSF1EE105 ECA1HM470 ECJ2VC1H101J ECJ2VF1H104Z ECA1HM2R2 ECQB1H473JM ECA1VM471 ECA1VM221 ECA1VM222 ECCF1H020CC ECJ2VB1C104K ECA1CM101 ECQM1104JZ ECA1CM221 ECJ2VC1H221J ECQB1H222JM ECJ2VC1H180J ECA1AM101 ECJ2VF1H103Z ECJ2VC1H102J ECCD2H100D ECKD2H821KB ECKD2H101KB ECA1HMR22 ECJ2VC1H222J ECJ2VC1H391J ECJ2VC1H221J ECJ2VC1H151J ECA1EM220 ECA1VM331 ECA1CM331 ECA1CM331 ECKD2H561KB ECA2EM220 ECA1CM102 ECKD2H102KB ECA1CM221 ECEA1HN2R2U ECKD2H561KB ECKD2H561KB DESCRIPTION CAP,C 330PF/50V CAP,C 330PF/50V CAP,C 330PF/50V CAP,C .001UF-K-2KV CAP,E 1.0UF-25V CAP,C .1UF-I-16V CAP,E 47UF/50V CAP,E 1.0UF/50V CAP,E 1.0UF/50V CAP,T 1.0UF/25V CAP,E 47UF/50V CAP,C 100PF-J-50V CAP,C .1UF-Z-50V CAP,E 2.2UF/50V CAP,P .047UF-J-50V CAP,E 470UF/35V CAP,E 220UF/35V CAP,E 2200UF/35V CAP,C 2PF-C-50V CAP,C .1UF-I-16V CAP,E 100UF/16V CAP,P .1UF-J-100V CAP,E 220UF/16V CAP,C 220PF-J-50V CAP,P 2200PF-J-50V CAP,C 18PF-J-50V CAP,E 100UF/10V CAP,C .01UF-Z-50V CAP,C .001UF-J-50V CAP,C 10PF-D-500V CAP,C 820PF-K-500V CAP,C 100PF-K-500V CAP,E .22UF/50V CAP,C .0022UF-J-50V CAP,C 390PF-J-50V CAP,C 220PF-J-50V CAP,C 150PF-J-50V CAP,E 22UF/25V CAP,E 330UF/35V CAP,E 330UF/16V CAP,E 330UF/16V CAP,C 560PF-K-500V CAP,E 22UF-250V CAP,E 1000UF/16V CAP,C .001UF-K-500V CAP,E 220UF/16V CAP,E 2.2UF/50V CAP,C 560PF-K-500V CAP,C 560PF-K-500V
PARTS LIST
ECWH12H822JS CAP,P .0082UF-J-1.2KV
Parts List
- 36 -
074-00
REPLACEMENT PARTS LIST
Models: CT-27D10B, CT-27D10UB & CT-27D10DB Important Safety Notice: Components printed in BOLD TYPE have special characteristics important for safety. When replacing any of these components use only manufacturer's specified parts.
REF NO. C564 C565 C566 C568 C569 C571 C572 C573 C601 C603 C616 C641 C801 C802 C803 C804 C805 C806 C807 C808 C809 C810 C811 C812 C814 C815 C818 C820 C821 C822 C823 C824 C825 C2202 C2203 C2204 C2205 C2206 C2207 C2208 C2209 C2210 C2211 C2212 C2215 C2218 C2301 C2302 C2305 C2306 PART NO. ECKD3D821JB ECKD3D181JB ECQM2274JZ TACFV2E474J ECA1CM471 ECA1CM100 ECA1CM101 ECJ2VF1H103Z ECQB1H223JM ECJ2VB1C104K ECA1HM100 DESCRIPTION CAP,C 820PF-J-2KV CAP,C 180PF-J-2KV CAP,P .27UF-J-200V CAP,M .47UF-J-200V CAP,E 470UF/16V CAP,E 10UF/16V CAP,E 100UF/16V CAP,C .01UF-Z-50V CAP,P .022UF-J-50V CAP,C .1UF-I-16V CAP,E 10UF/50V REF NO. C2307 C2309 C2311 C2313 C2314 C2315 C2321 C2324 C2325 C2326 C2327 C2328 C2329 C2331 C2333 C2339 C2340 C2342 C2350 C2351 C2352 C2353 C2354 C2355 C2356 C2357 C2358 C2359 C2360 C2361 C2362 C2363 C2364 C2365 C2366 C3001 C3002 C3003 C3004 C3006 C3007 C3008 C3009 C3010 C3011 C3012 C3013 C3014 C3016 C3018 PART NO. ECA1CM102 ECQB1H473JM ECA1HM3R3 ECA1EM101 ECQB1H473JM ECA1EM100 ECA1EM100 ECA1EM100 ECA1CM102 ECJ2VB1H223K ECJ2VB1H223K ECJ2VB1H223K ECJ2VB1H223K ECA1HM010 ECA1HM010 ECA1HM010 ECA1HM010 ECA1AM470 EEANA1E100B ECJ2VB1C104K ECJ2VB1H472K ECA1HM4R7 ECA1HM4R7 ECA1HM4R7 ECA1HMR47 ECA1CM100 EEANA1E100B ECJ2VB1C104K ECJ2VB1H472K ECA1AM470 ECQB1H104JM ECJ2BV1C104K ECA1HM4R7 ECA1AM470 ECJ2VF1H103Z ECJ2VF1H103Z ECA1AM101 ECA1CM100 ECA1HM010 ECA1HM010 ECA1CM100 ECA1CM100 ECA1HM010 ECJ2VF1H103Z ECA1HM010 ECA1CM100 ECA1CM100 ECA1HM010 ECA1HM010 ECA1CM100 DESCRIPTION CAP,E 1000UF/16V CAP,P .047UF-J-50V CAP,E 3.3UF/50V CAP,E 100UF/25V CAP,P .047UF-J-50V CAP,E 10UF/25V CAP,E 10UF/25V CAP,E 10UF/25V CAP,E 1000UF/16V CAP,C .022UF-K-50V CAP,C .022UF-K-50V CAP,C .022UF-K-50V CAP,C .022UF-K-50V CAP,E 1.0UF/50V CAP,E 1.0UF/50V CAP,E 1.0UF/50V CAP,E 1.0UF/50V CAP,E 47UF/10V CAP,E 10UF-25V CAP,C .1UF-I-16V CAP,C .0047UF-K-50V CAP,E 4.7UF/50V CAP,E 4.7UF/50V CAP,E 4.7UF/50V CAP,E .47UF/50V CAP,E 10UF/16V CAP,E 10UF-25V CAP,C .1UF-I-16V CAP,C .0047UF-K-50V CAP,E 47UF/10V CAP,P .1UF-J-50V CAP,C .1UF-I-16V CAP,E 4.7UF/50V CAP,E 47UF/10V CAP,C .01UF-Z-50V CAP,C .01UF-Z-50V CAP,E 100UF/10V CAP,E 10UF/16V CAP,E 1.0UF/50V CAP,E 1.0UF/50V CAP,E 10UF/16V CAP,E 10UF/16V CAP,E 1.0UF/50V CAP,E 1.0UF/50V CAP,E 10UF/16V CAP,E 10UF/16V CAP,E 1.0UF/50V CAP,E 1.0UF/50V CAP,E 10UF/16V ECWH12H272JS CAP,P .0027UF-J-1.2KV
ECKDAE472ZED CAP,C .4700PF-Z-250VAC ECKDAE472ZED CAP,C .4700PF-Z-250VAC E