Panasonic CT-27D10B, CT-27D10UB, CT-27D10DB Service Manual

ORDER NO. MTNC000417C1

B5

Color Television

Main Manual

(NA8)

Panasonic

Models Chassis

CT-27D10B AP338

CT-27D10UB AP338

CT-27D10DB 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.

Important Safety Notice

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.

General Guidelines

Safety Precautions

metallic part has a return path to the chassis, the

An Isolation Transformer should always be used

during the servicing of a receiver whose chassis is not

reading should be between 240kΩ and 5.2MΩ. If the

isolated from AC power line. Use a transformer of

exposed metallic part does not have a return path to

adequate power rating as this protects the technician

the chassis, the reading should be infinite.

from accidents resulting in personal injury from

Leakage Current Hot Check (Fig. 1)

electrical shocks. It will also protect the Receiver from

Plug the AC cord directly into the AC outlet. Do not use

being damaged by accidental shorting that may occur

an isolation transformer during the check.

during servicing.

Connect a 1.5kΩ 10 watt resistor in parallel with a

When servicing, observe the original lead dress,

0.15µF capacitor between an exposed metallic part

especially in the high voltage circuit. Replace all

and ground. Use earth ground, for example a

damaged parts (also parts that show signs of

water pipe.

overheating.)

Using a DVM with a 1000 ohms/volt sensitivity or

Always Replace Protective Devices, such as

higher, measure the AC potential across the resistor.

fishpaper, isolation resistors and capacitors, and

Repeat the procedure and measure the voltage

shields after servicing the Receiver. Use only

present with all other exposed metallic parts.

manufacturer’s recommended rating for fuses, circuits

Verify that any potential does not exceed 0.75 volt

breakers, etc.

RMS. A leakage current tester (such a Simpson Model

High potentials are present when this Receiver is

229, Sencore Model PR57 or equivalent) may be used

operating. Operation of the Receiver without the rear

in the above procedure, in which case any current

cover introduces danger for electrical shock. Servicing

measure must not exceed 1/2 milliamp. If any

should not be performed by anyone who is not

measurement is out of the specified limits, there is a

thoroughly familiar with the necessary precautions

possibility of a shock hazard and the Receiver must be

when servicing high-voltage equipment.

repaired and rechecked before it is returned to the

Extreme care should be practiced when Handling the

customer.

Picture Tube. Rough handling may cause it to implode

AC VOLTMETER

due to atmospheric pressure. (14.7 lbs per sq. in.). Do

not nick or scratch the glass or subject it to any undue

COLD

pressure. When handling, use

safety

goggles

and

heavy gloves for protection. Discharge the picture

WATER

PIPE

tube by shorting the anode to chassis ground (not to

(GROUND)

the cabinet

or to other

mounting hardware). When

0.15µF

discharging connect cold ground (i.e. dag ground lead)

to the anode with a well insulated wire or use a

grounding probe.

TO INSTRUMENT’S

Avoid prolonged exposure at close range to unshielded

1500Ω,10 W

EXPOSED METAL

areas of the picture tube to prevent exposure to X-

PARTS

ray radiation.

Figure 1.

Hot Check Circuit

The Test Picture Tube used for servicing the chassis

X-ray Radiation

at the bench should incorporate safety glass and

WARNING: The potential source of X-ray radiation in the

magnetic shielding. The safety glass provide shielding

for the tube viewing area against X-ray radiation as

TV set is in the High Voltage section and the picture tube.

well as implosion. The magnetic shield limits the X-ray

Note: It is important to use an accurate, calibrated

radiation around the bell of the picture tube in addition

high voltage meter.

to the restricting magnetic effects. When using a

Set the brightness, picture, sharpness and color

picture tube test jig for service, ensure that the jig is

controls to Minimum. Measure the High Voltage. The

capable

of

handling

40kV

without

causing

X-

high voltage should be 28.30kV ± 1.25kV. If the upper

ray radiation.

limit is out of tolerance, immediate service and

Before returning a serviced receiver to the owner,

correction is required to insure safe operation and to

the service technician must thoroughly test the unit to

prevent the possibility of premature component failure.

ensure that is completely safe to operate. Do not use a

Horizontal Oscillator Disable Circuit Test

line isolation transformer when testing.

This test must be performed as a final check before the

Leakage Current Cold Check

Receiver is returned to the customer. See Horizontal

Unplug the AC cord and connect a jumper between the

Oscillator

Disable

Circuit

Procedure

Check

in

two plug prongs.

this manual.

Measure the resistance between the jumpered AC plug

and expose metallic parts such as screwheads,

antenna terminals, control shafts, etc. If the exposed

- 2 -

Important Safety Notice . . . . . . . . . . . . . . . . . . 2

Safety Precautions . . . . . . . . . . . . . . . . . 2

Service Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Horizontal Oscillator Disable Circuit . . . . 5

Receivers Feature Table . . . . . . . . . . . . . . . . . . 6

Location of Controls (Receiver)

Receiver Front Control Panel . . . . . . . . . 7

Location of Controls (Remote)

EUR511502 . . . . . . . . . . . . . . . . . . . . . . 8

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 . . . . . . . . . 14 Toggle between Modes. . . . . . . . . . . . . 14 Exiting the Serviceman Mode. . . . . . . . 14 Sub-Data Adjustment (B) . . . . . . . . . . . 15 Cut-Off Adjustment (C) . . . . . . . . . . . . . 15 Pin Cushion Adjustment (D) . . . . . . . . . 16 MTS Adjustment (M). . . . . . . . . . . . . . . 16 PIP Adjustment (P) . . . . . . . . . . . . . . . . 17 Options Adjustment (S) . . . . . . . . . . . . 18 Comb Filter Adjustment (X) . . . . . . . . . 19 To Check Purity . . . . . . . . . . . . . . . . . . 20 Helpful Hints . . . . . . . . . . . . . . . . . . . . . 20

Instructional Flow Chart

for Serviceman Mode . . . . . . . . . . . . . . . . 21

Service Adjustments

(Electronic Control). . . . . . . . . . . . . . . . . . 24

Sub-Brightness . . . . . . . . . . . . . . . . . . . 24

Sub-Contrast. . . . . . . . . . . . . . . . . . . . . 24

Tint/Color Adjustment . . . . . . . . . . . . . . 24

Color Temperature Adjustment . . . . . . . 25

Complete Adjustment . . . . . . . . . . . . . . 25

Horizontal Centering . . . . . . . . . . . . . . . 26

MTS Circuit Adjustment . . . . . . . . . . . . 26

Input Level Adjustment . . . . . . . . . . . . . 26

Stereo Separation Adjustment . . . . . . . 26

Clock Adjustment . . . . . . . . . . . . . . . . . 27

Vertical Size . . . . . . . . . . . . . . . . . . . . . 27

Service Adjustments

(Mechanical Controls). . . . . . . . . . . . . . . . 27

VCO Field Adjustment L105 . . . . . . . . . 27

Focus (Part of T551). . . . . . . . . . . . . . . 27

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

- 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 1.6kΩ resistor, 0 = 0Ω (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.

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.

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.

TYPE	Chip Components		SOLDER
	GRADE		CAPS
	c
b
e	TRANSISTOR	CAPACITOR
		1ST DIGIT	2ND DIGIT

COMMON

CATHODE MULTIPLIER =1600 = 1.6k

ANODES	SOLDER
	CAPS
MH DIODE	RESISTOR

How to Replace Flat-IC

- Required Tools -

•	Soldering iron	•	De-solder braids
•	Iron wire or small awl	•	Magnifier

1.Remove the solder from all of the pins of a Flat-IC by using a de-solder braid.

De-Solder

Braid

Flat-IC

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	Soldering
Pull	Iron
		Iron

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

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

.........

123

5.Solder all pins to the soldering pads using a fine tipped soldering iron.

Solder	Soldering
	Iron

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	Soldering
Bridge	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		CT-27D10B/UB	CT-27D10DB
	Chassis		NA8	NA8
	Tunning system		96K	96K
	# of channels		181	181
	Menu language		Eng/Span/Fr	Eng/Span/Fr
	Closed Caption		X	X
	V-Chip		X	X
	75 Ω input		X	X
	Remote Model #		EUR511502	EUR511502
	Picture tube		M68LGL061X	M68LGL061X
	Black Face Regular Tube		X	X
	Comb Filter		3 Line Digital	3 Line Digital
	H. Edge Correction		X	X
	V/A norm		X	X
	Color Temp		X	X
	MTS/SAP/DBX		X	X
	BASS/BL/TRE Control		X	X
	AI Sound		X	X
	Surround		X	X
	Built-in audio power		5Wx2 (10%)	5Wx2 (10%)
	# of speakers		2	2
	A/V in (rear/front)		3(2/1)	3(2/1)
	S-VHS Input (rear/front)		1/0	1/0
	Component Input		1	1
	(Y,Pb,Pr)
	Audio Out		F,V	F,V
	(FAO: F, VAO: V)
	Headphone Jack		Mini plug	Mini plug
	Dimensions	mm	665.2x544.5x594.8	665.2x544.5x594.8
	(WxDxH)	in	26.2x21.5x23.5	26.2x21.5x23.5
	Weight (kg/lbs)		35/77.2	35/77.2
	Power source (V/Hz)		120/60	120/60
	Anode voltage		28.30kV ± 1.25kV	28.30kV ± 1.25kV
	Video input jack		1Vp-p 75Ω, phono jack	1Vp-p 75Ω, phono jack
	Audio input jack		500mV RMS 47kΩ	500mV RMS 47kΩ
	A-Board TNP2AH017		NIL	NIL
	C-Board TNP2AA047		AP	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	Front A/V Input
					Sensor

Figure 2. Location of Controls (Receiver).

Quick Reference Control Operation

Quick Reference

Control Operation

1Power Button - Press to turn ON or OFF.

2Volume 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

3features 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).

4Action Button - Press to display Main Menu and access On Screen feature and Adjustment Menus.

5TV/Video Button - Press to select TV or Video Input.

-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.

LIGHT

Press to light remote control buttons.

Presione para iluminar los botones del control remoto.

Appuyer pour éclairer les touches de la télécommande.

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.

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.

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.

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.

“0”~ “9”

Press numeric keypad to select any channel.

RECALL

Press to display time, channel, sleep timer, and other options.

			Presione para visualizar la
	Presione el teclado numérico
	para seleccionar cualquier		Hora (Time), Canal (Channel),
	canal.		Cronómetro de Apagado
			Automático (Sleep Timer), y
	Appuyer sur une touche		otras opciones.
	numérique du clavier pour
			Appuyer pour afficher l'heure, le
	sélectionner un canal.
			numéro du canal, l'état de la
		EUR511502	minuterie-sommeil et d'autres
			options.
	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.

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.

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.

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

Plugs into the socket on the CRT neck.

Speakers

Speaker is secured to the cabinet’s front with 4 screws.

Keyboard Push Button Assembly

Fastened to the inside of the cabinet front with up to 3 screws.

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.

- 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 001			IC 003	Figure 4. A-Board Main Components
				SP
							IC451
IC 002					COLD (	)
				IC 551
						HOT (	)
								Q 501
						RL801
		IC 6501	IC 2302	IC 552
							IC 803
								Q 551
	T
	U		IC 101
	N
	E
	R			IC 2361	IC 3001		F801
							TPD8	D554
FA1	CLK	TP					TPD9
DATA	TP15						C552
		FA2
							FOCUS	SCREEN

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.

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	VOLTAGE
TPD8	27.4V ± 2V
TPD9	13.0V ± 2V
C552 (+) side	8.0V	± 1V
IC551 Pin3	9.0V	± 0.5V
D554 Cathode	220V ± 15V
C572 (+) side	5.0V	± 0.25V

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.

- 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.

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	Purity Rings Centered
R&B&G Convergence Rings	Over G3/G4 Gap

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	Purity Rings Centered
R&B&G Convergence Rings	Over G3/G4 Gap

G3 G4

Vertical Raster Shift Ring

Figure 6. Positioning of Purity/Convergence Assembly

(4 Pairs of Rings)

R&B&G Convergence Rings	90o
R&B Convergence Rings
Vertical Raster
Shift Rings
Purity Rings

Figure 7. Positioning of Purity/Convergence Assembly

(4 Pairs of Rings)

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)

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.

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	Open the
	same angle
	from center
Mechanical
Center Marks	Vertical Raster Shift tabs

Figure 9. Vertical Raster Shift Adjustment

(4 pairs of rings assembly)

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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 at this point is not important.

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.

Figure 10. Green Raster Adjustment Green Raster

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.

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.

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.

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.

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G

R B

Figure 11.

As the yoke is tilted vertically, the rasters produced by the outside guns rotate in opposite directions.

Vertical Yoke Movement

Raster produced from one of the

outside electron beams

	Raster from the other side electron
R G B	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

Static Convergence Magnets		11 o’clock Position
Converges	Converges
R/B with G	R with B

Double sided adhesive tape

Purity/Convergence

Assembly Clamp

3 o’clock Position

Yoke Positioning Wedges Purity Rings Adj. on for Dynamic Convergence

Green Raster

7 o’clock Position

Figure 13. Convergence Magnets and Wedges Location

Note: For models using 4 pairs of rings assemblies see Fig. 6 for details

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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 .

Note: Only the applicable settings for the Receiver serviced will be available (See a in Fig. 14).

b		a	b		a
32	B 0			2 215 C 0

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.

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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).

CH

	Sub-Data Adjustment	Default
		Level
B0	SUB-COLOR	31
B1	SUB-TINT	31
B2	SUB-BRIGHTNESS	31
B3	SUB-CONTRAST	16
B4	SUB-TINT VIDEO	16
B5	SUB-COLOR VIDEO	16
B6	SUB-TINT COMP	63
B7	SUB-COLOR COMP	31
B8	SUB SHARP TV/VIDEO	10
B9	SUB SHARP S-VHS/COMP	31
BA	SUB-CONTRAST FIXED	15

CH

CH

		Cut-Off Adjustment	Default
			Level
	C0	CUT-OFF R	128
	C1	CUT-OFF G	128
	C2	CUT-OFF B	128
CH	C3	USER BRIGHTNESS	31
	C4	G DRIVE	64
	C5	B DRIVE	64
	C6	DRIVE C TEMP	8
	C7	CONTRAST C TEMP	5

To D Items.

IMPORTANT NOTE:

Always Exit the Serviceman

Mode Following Adjustments.

PW

PW

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