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ORDER NO. MTNC010306C1
B5
Service Manual Color Television
Main Manual
(NA7D)
Panasonic
Models Chassis
CT-25G6E AP361
CT-25G6CE AP361
CT-25G6UE AP361
CT-27G6E AP362
CT-27G6E/DE/UE
CT-27G6DE AP362
CT-27G6UE AP362
Quasar
Models Chassis
SP-2724E EC363
SP-2724UE EC363
SP-2724E/UE
This Service manual is issued as a service guide for the models of the NA7D family listed above. Included are
schematics, alignment procedures, disassembly procedures, and a 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 Manual.
Copyright 2001 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.
Safety Precautions
General Guidelines metallic part has a return path to the chassis, the
An Isolation Transformer should always be used during reading should be between 240k and 5.2M. If the
the servicing of a Receiver whose chassis is not exposed metallic part does not have a return path to
isolated from AC power line. Use a transformer of the chassis, the reading should be infinite.
adequate power rating as this protects the technician Leakage Current Hot Check (Fig. 1)
from accidents resulting in personal injury from Plug the AC cord directly into the AC outlet. Do not use
electrical shocks. It will also protect the Receiver from an isolation transformer during the check.
being damaged by accidental shorting that may occur Connect a 1.5k 10 watt resistor in parallel with a
during servicing. 0.15µF capacitor between an exposed metallic part
When servicing, observe the original lead dress, and ground. Use earth ground, for example a
especially in the high voltage circuit. Replace all water pipe.
damaged parts (also parts that show signs of Using a DVM with a 1000 ohms/volt sensitivity or
overheating.) higher, measure the AC potential across the resistor.
Always Replace Protective Devices, such as fishpaper, Repeat the procedure and measure the voltage
isolation resistors and capacitors, and shields after present with all other exposed metallic parts.
servicing the Receiver. Use only manufacturer's Verify that any potential does not exceed 0.75 volt
recommended rating for fuses, circuits 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 0.5 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
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 X-ray
radiation. Figure 1. Hot Check Circuit
The Test Picture Tube used for servicing the chassis at
the bench should incorporate safety glass and X-ray Radiation
magnetic shielding. The safety glass provide shielding WARNING: The potential source of X-ray radiation in the
for the tube viewing area against X-ray radiation as Receiver is in the High Voltage section and the picture
well as implosion. The magnetic shield limits the X-ray tube. Refer to "X-Ray Protection Circuit Check &
radiation around the bell of the picture tube in addition Adjustments" on page 5 to confirm HHS voltage.
to the restricting magnetic effects. When using a High Voltage (CRT Anode)
picture tube test jig for service, ensure that the jig is Set the brightness, picture, sharpness and color
capable of handling 50kV without causing X-ray controls to minimum (to obtain dark image). Measure
radiation. the High Voltage. The high voltage should be
Before returning a serviced Receiver to the owner, the 29.25kV ± 1.25kV. If the upper limit is out of tolerance,
service technician must thoroughly test the unit to immediate service and correction is required.
ensure that is completely safe to operate. Do not use a
line isolation transformer when testing. Note: It is important to use an accurate, calibrated
high voltage meter.
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-
Important Safety Notice . . . . . . . . . . . . . . . . . . 2 Service Adjustments
(Electronic Control). . . . . . . . . . . . . . . . . . 22
Safety Precautions . . . . . . . . . . . . . . . . . 2
Sub-Contrast. . . . . . . . . . . . . . . . . . . . . 22
Service Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Sub-Brightness . . . . . . . . . . . . . . . . . . . 22
X-Ray Protection Circuit Check Tint/Color Adjustment . . . . . . . . . . . . . . 22
& Adjustments . . . . . . . . . . . . . . . . . 5 White Balance. . . . . . . . . . . . . . . . . . . . 23
Sub-Brightness Final Adjustment . . . . . 23
Horizontal Centering . . . . . . . . . . . . . . . 23
Vertical Size . . . . . . . . . . . . . . . . . . . . . 24
Receivers Feature Table . . . . . . . . . . . . . . . . . . 6 MTS Circuit Adjustment . . . . . . . . . . . . 24
Input Level Adjustment . . . . . . . . . . . . . 24
Location of Receiver Controls . . . . . . . . . . . . . 7
Stereo Separation Adjustment . . . . . . . 24
Location of Controls . . . . . . . . . . . . . . . . . . . . . 8 Clock Adjustment . . . . . . . . . . . . . . . . . 24
Service Adjustments
(Mechanical Controls). . . . . . . . . . . . . . . . 25
Disassembly for Service . . . . . . . . . . . . . . . . . . 9 Focus (Part of T551). . . . . . . . . . . . . . . 25
Disassembly for CRT Replacement . . . . . . . . . 9 Component Identification . . . . . . . . . . . . . . . . 26
CRT Replacement . . . . . . . . . . . . . . . . . . . . . . . 9 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Chassis Service Adjustment Procedures . . . 10 Components Abbreviations Guide. . . . . . . . . 35
130.0V B+ Voltage Confirmation . . . . . 10 Schematic Notes . . . . . . . . . . . . . . . . . . . . . . . 36
Source Voltage Chart . . . . . . . . . . . . . . 10 Service Mode Adjustments. . . . . . . . . . . . . . . 47
High Voltage Check . . . . . . . . . . . . . . . 10
Purity Convergence Procedure . . . . . . . . . . . .11
Vertical Raster Shift Adjustment . . . . . . .11
Initial Center Static Convergence . . . . . .11 C-Board Schematic . . . . . . . . . . . . . . . . . . . . . 39
Purity Adjustment . . . . . . . . . . . . . . . . . 12 C-Board Voltages. . . . . . . . . . . . . . . . . . . . . . . 39
Final Convergence Procedure . . . . . . . 12
Permalloy Convergence A-Board Schematics
Corrector Strip . . . . . . . . . . . . . . . . 12 CT-25G6/CE/UE . . . . . . . . . . . . . . . . . . . 40
Service Mode CT-27G6E/CE/UE) . . . . . . . . . . . . . . . . . 42
(Electronic Controls). . . . . . . . . . . . . . . . . 14 SP-2724E/UE . . . . . . . . . . . . . . . . . . . . . 42
Instructional Flow Chart A-Board Voltages. . . . . . . . . . . . . . . . . . . . . . . 44
for Service Mode . . . . . . . . . . . . . . . . . . . . 20
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
A & C-Boards Layouts. . . . . . . . . . . . . . . . . . . 46
-3-
Service Notes
Note: Some components may be affixed with glue. Be careful not to break or damage 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 How to Replace Flat-IC
(surface mount) - Required Tools -
Chip components must be replaced with identical chips · Soldering iron · De-solder braids
due to critical foil track spacing. There are no holes in
the board to mount standard transistors or diodes. · Needle nose pliers · Magnifier
Some chips capacitor or resistor board solder pads · Wire cutters (sharp & small)
may have holes through the board, however the hole
diameter limits standard resistor replacement to 1/8 1. Cut the pins of a defective IC with wire cutters.
watt. Standard capacitor may also be limited for the Remove IC from board. If IC is glued to the board,
same reason. It is recommended that identical heat the IC and release the IC. See Note above.
components be used.
Chip resistor have a three digit numerical resistance Flat IC
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
2. Using soldering iron and needle nose pliers
indicated on the capacitor. The color of the component
indicates the general range of the capacitance. remove the IC pins from the board.
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 Soldering
common anode or common cathode. Check the parts Iron
list for correct diode number.
3. Using de-soldering braid and soldering iron remove
Component Removal solder from affected are on board (pads).
1. Use solder wick to remove solder from component De-soldering
end caps or terminal. Braid
2. Without pulling up, carefully twist the component
with tweezers to break the adhesive. Soldering
3. Do not reuse removed leadless or chip Iron
components since they are subject to stress 4. Position the new Flat-IC in place (apply the pins of
fracture during removal. the Flat-IC to the soldering pads where the pins
Chip Component Installation need to be soldered). Determine the positions of
1. Put a small amount of solder on the board the soldering pads and pins by correctly aligning
soldering pads. the polarity symbol. Solder pin #1 first, align the IC.
2. Hold the chip component against the soldering 2nd solder
pads with tweezers or with a miniature alligator clip Polarity 1st solder
and apply heat to the pad area with a 30 watt iron symbol
until solder flows. Do not apply heat for more than
3 seconds.
Solder the pin opposite to pin #1. This will assist
Chip Components positioning the IC.
5. Solder all pins to the soldering pads using a fine
tipped soldering iron.
Soldering
Solder
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.
-4-
IMPORTANT: To protect against possible damage to X-Ray Protection Circuit Check &
the solid state devices due to arcing or static Adjustments
discharge, make certain that all ground wires and CRT This test must be performed as final check before the
DAG wire are securely connected. Receiver is returned to the customer. If voltages are
CAUTION: The power supply circuit is above earth out of tolerance, immediate service and correction is
ground and the chassis cannot be polarized. Use an required to insure safe operation and to prevent the
isolation transformer when servicing the Receiver to possibility of premature component failure.
avoid damage to the test equipment or to the chassis. Equipment:
Connect the test equipment to the proper ground ( ) or 1. Isolation transformer.
( ) when servicing, or incorrect voltages will be 2. High voltage meter.
measured. 3. Short jumper.
WARNING: This Receiver has been designed to meet 4. Jumper diode (same as D823, PN S3L60P154004).
or exceed applicable safety and X-ray radiation Diode should be rated a minimum of 150V.
protection as specified by government agencies and Procedure:
independent testing laboratories. 1. Connect the Receiver to an isolation transformer.
Turn Receiver ON.
To maintain original product safety design standards 2. Apply a monoscope pattern.
relative to X-ray radiation and shock and fire hazard, 3. In Service Mode (see Service Mode Section in this
parts indicated with the symbol on the schematic manual) select register Cb.
must be replaced with identical parts. Order parts from 4. Measure TP5 (located near the tuner). Compare
the manufacturer's parts center using the parts the measured value to the left column of the table
numbers shown in this service manual, or provide the below. Set Cb with value from the right column
chassis number and the part reference number. corresponding to the measured level at TP5.
Example, if the measured level at TP5 is 1.03V, set
For optimum performance and reliability, all other parts Cb to 03.
should be replaced with components of identical
specification.
TP5 MEASUREMENT SET Cb TO (HEX)
0 ~ 0.93V 00
0.93 ~ 0.97V 01
0.97 ~ 1.01V 02
1.01 ~ 1.05V 03
1.05 ~ 1.09V 04
1.09 ~ 1.13V 05
1.13 ~ 1.17V 06
1.17 ~ 1.21V 07
5. Exit Service Mode and shut it OFF.
6. Connect the short jumper between TPD16 and
TPD17.
7. Connect the jumper diode between TPD14 and
TPD15 (cathode connected to TPD14, anode
connected to TPD15, See Fig. 4 for locations).
8. Apply 75VAC to the input of the isolation
transformer.
9. Turn Receiver ON.
10. Set PICTURE and BRIGHTNESS to minimum.
11. Slowly increase the voltage at the input of the
isolation transformer and confirm HHS voltage
measure 35.0KV for 25" models, 35.8KV for 27"
models using SAMSUNG CRT or 35.0KV for 27"
models using AMEC CRT when the Receiver starts
to go out of sync.
12. Turn Receiver OFF and remove jumper & diode.
-5-
Receiver Feature Table
FEATURE\MODEL CT-25G6E/CE/UE CT-27G6E/DE/UE SP-2724E/UE
Chassis AP361 AP362 EC363
Tuning system 40K 40K 40K
# of channels 181 181 181
Menu language Eng/Span/Fr Eng/Span/Fr Eng/Span/Fr
Closed Caption X X X
V-Chip X X X
75 input X X X
FM radio X N/A N/A
Remote Model # EUR501455 EUR501450 EUR511514
Picture tube A63QDB891X A68QDN891X M68LGL061X
Panablack Tube X X X
Comb Filter 2 Line Digital 2 Line Digital 2 Line Digital
V/A norm V V V
MTS/SAP/DBX X X X
AI Sound X X X
Built-in audio power 1.5W x 2 (10%) 1.5W x 2 (10%) 1.5W x 2 (10%)
# of speakers 2 2 2
A/V in (rear/front) 1 (1 / 1) 1 (1 / 0) 1 (1 / 0)
S-VHS input (rear/front) N/A 1/0 1/0
Headphone Jack X X N/A
Dimensions mm 633.4 x 491.8 x 568 665.2 x 545 x 594.8 731 x 684 x 614
(WxDxH) in 24.9 x 19.4 x 22.4 26.2 x 21.5 x 23.4 28.8 x 26.9 x 24.2
Weight (kg/lbs) 29 / 63.8 35 / 77.2 35 / 77.2
Power source (V/Hz) 120 / 60 120 / 60 120 / 60
Anode voltage 29.25kV ± 1.25kV 29.25kV ± 1.25kV 29.25kV ± 1.25kV
Video input jack 1Vp-p 75, phono jack 1Vp-p 75, phono jack 1Vp-p 75, phono jack
Audio input jack 500mV RMS 47k 500mV RMS 47k 500mV RMS 47k
A-Board TNP2AH024 CB* BB* BH*
C-Board TNP2AA075 AC* AB* AG*
Table 1. Receiver Features
Specifications are subject to change without notice or obligation.
Dimensions and weights are approximate.
* Note: When ordering a replacement board assembly,
append an "S" to the board number.
Example: to order the A-Board for CT-27G6E, the
replacement board is TNP2AH024BBS.
-6-
Location of Receiver Controls
Remote Control Front A/V Input
1 2 3 4 5 (Available on
Sensor
some models)
Figure 2. Location of Controls (Quasar models displayed, Panasonic models vary).
Quick Reference
Control Operation
1 Power Button - Press to turn ON or OFF.
2 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
3 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).
4 Action Button - Press to display Main Menu and access On Screen feature and
Adjustment Menus.
5 TV/Video Button - Press to select TV or Video Input.
-7-
Location of Controls
POWER TV, VCR, DBS/CBL, DVD
Press to turn ON and OFF. Press to select remote
operation.
TV/VIDEO
EXIT/GUIDE
Press to select TV or Video
Mode. DBS function buttons.
VOL CH
Press to adjust TV sound and Press to select next channel
navigate in menus. and navigate in menus.
MUTE ACTION
Press to mute sound. Press to Press to access menus.
access and cancel (CC) Closed
Caption.
RECALL
"0"~ "9" Press to display time, channel,
sleep timer, and other options.
Press numeric keypad to select
any channel.
R-TUNE REW, PLAY, FF, TV/VCR,
STOP, PAUSE, REC,
Press to switch to previously VCR/DBS CH
viewed channel or video mode.
Component function buttons.
EUR511514
(Typical)
Figure 3. Location of Controls (Quasar models, Panasonic remotes vary).
-8-
Disassembly for Service
Back Cover Disassembly for CRT Replacement
Remove all the screws marked with an arrow( ) 1. Discharge the CRT as instructed in the Safety
Precautions (see page 2).
from the back of the Receiver.
2. Disconnect the yoke (DY) plug, degaussing coil
Note: Screw configuration, type, and number of (DEG) plug from the main board.
screws vary depending on the model of the 3. Unplug the CRT 2nd anode button from the main
Receiver serviced; various models are covered board.
in this Manual. Reuse hardware when 4. Remove the C-Board from the CRT base and
reassembling the Receiver. unplug the black wire (CRT dag ground) C10.
5. Disconnect the A11, A12, and Speakers plugs from
· 3 screws at the top edge of the Receiver. the A-Board.
· 1 screw at each lower corner of the Receiver. 6. Lift the Main Chassis (A-Board) and all mounted
· 1 screw by the AC cord assembly. boards completely out with the CRT Board attached.
· 1 screw by the A/V jacks.
· 1 screw by the Flyback assembly. CRT Replacement
1. Perform Disassembly for CRT Replacement
A-Board - Main Chassis procedure.
1. Slide the chassis completely out of the guide rails. 2. Insure that the CRT H.V. Anode button is
2. Stand the Receiver on its edge. The underside of discharged before handling the CRT. Read the
the board is completely accessible for component Safety Precautions (see page 2 on handling the
replacement. picture tube.)
Note: Some tie-wraps that secure the wire dressings 3. Remove the components from the CRT neck and
may need to be unfastened for chassis place the cabinet face down on a soft pad.
removal. 4. Note the original order for the CRT mounting
hardware as they are remove from the CRT
C-Board - CRT Output mounting brackets at each corner of the CRT.
The board plugs onto the socket on the CRT neck. 5. Remove the CRT with the degaussing coil and the
To release the Focus wire, use a dull object to dag ground braid attached.
release the tab on the socket (near the wire 6. Note the original locations and mounting of the
opening) and carefully pull on the wire. To connect degaussing coil and the dag ground assembly to
the Focus wire, press on the tab to lock it then insure proper reinstallation on the replacement
insert the wire in the opening and press on it until it CRT.
is fully inserted and locked in place. To remove and re-mount the degaussing coil: The
degaussing coil is held in place by clampers
Speakers fastened to the CRT corner ears. These clampers
Each speaker is secured to the cabinet's front with must be installed onto the replacement CRT prior
2 screws. to mounting the degaussing coil.
To remove and re-mount the dag ground braid:
Keyboard Push Button Assembly a. Unhook the coil spring from the bottom corners
Fastened with screws to the inside of the cabinet of the CRT ears.
front. 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 Note: Connect the (-) lead of the voltmeter to the
not require adjustment unless controls and/or appropriate ground. Use IC801's heat sink
associated components are replaced. when the HOT ground symbol ( ) is used.
Otherwise, use COLD ground ( ) -- Tuner
shield, IC451's heat sink or FA2.
Figure 4. A-Board Main
Components and Test Points
(Components within dotted
areas are located on
trace side)
MOMENTARILY CONNECT A JUMPER TO ENTER SERVICE MODE (FA1 to FA2)
130.0V B+ Voltage Confirmation Adjust Picture Menu for normalized video adjustments.
1. Set the Bright and the Contrast to Minimum by
High Voltage Check
using the Picture Menu.
1. Select an active TV channel and confirm that
2. Connect the DVM between C825 (+ side) or
horizontal is in sync.
TPD14 and cold ground ( ). 2. Adjust Brightness and Contrast using Picture Icon
3. Confirm that B+ voltage is 130.0V ± 2.5V. This menu so video just disappears.
voltage supplies B+ to the Horizontal Output & 3. Confirm B+ 131V is within limit.
Flyback circuits. 4. Using a high voltage meter confirm that the High
Source Voltage Chart Voltage is 29.25kV ± 1.25kV.
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 26.0V ± 2.0V
TPD9 13.0V ± 2.0V
IC551 Pin3 9.0V ± 0.25V
IC552 Pin3 5.0V ± 0.25V
D554 Cathode 220V ± 15V
- 10 -
Purity and Convergence Procedure
Adjustment is necessary only if the CRT or the results, note part number and look for specifications at
deflection yoke is replaced or if the setting was Service Center)
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 Figure 8. Positioning of Purity/Convergence
Place the yoke on the CRT neck (do not tighten Assembly (1-piece assembly)
the clamp).
For either assemblies:
For a 2-piece assembly (see Fig. 5): Turn the Receiver ON. Operate the Receiver for 60
Position purity/convergence assembly as shown and minutes using the first Purity Check field (white screen)
tighten clamp snugly. Remove the hot-melt glue seal to stabilize the CRT.
on assembly and position like tabs of purity device
together at 12 o'clock to reduce its magnetic field Fully degauss the Receiver by using an external
effect. 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
ModelswithPurity/ConvergenceAssemblywith4Pairs
of Rings).
Apply a green pattern with a horizontal line, adjust the
Figure 5. Positioning of Purity/Convergence Assembly Deflection Yoke so that has no tilt, then secure it.
(2-piece assembly) Adjust center line of the pattern with the mechanical
center of the CRT, this center is determined by two
For models using 4 pairs of rings, place the vertical marks at the side edges of the screen. To adjust the
raster shift tabs at 3 o'clock (90o from the purity and line, once the vertical raster shift tabs are place at 3
convergence tabs, see Fig. 6 and Fig. 7). 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.)
Figure 6. Positioning of Purity/Convergence
Assembly (4 Pairs of Rings)
Figure 9. Vertical Raster Shift Adjustment
(4 pairs of rings assembly)
Initial Center Static Convergence
Connect a dot/cross hatch generator to the Receiver
and tune in a signal. Observe misconvergence at
Figure 7. Positioning of Purity/Convergence center of the screen only.
Assembly (4 Pairs of Rings) 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
For a 1-piece assembly (see Fig. 8): separating tabs and rotating to converge blue and red
Position like tabs of purity devices together at 12 (magenta) with green.
o'clock to reduce any magnetic field effect. (For better
Note: Precise convergence at this point is
not important.
- 11 -
Purity Adjustment Final Convergence Procedure (see Fig. 11
When the Receiver is in the Service Mode for making through Fig. 13):
electronic adjustments, press the Recall button on the
Remote Control to enter Purity Check. (See the Note: Vertical size and focus adjustments must be
Service Adjustments Electronic Controls procedure). completed prior to performing the convergence
Operate the Receiver for 60 minutes using the first adjustment. Connect a dot pattern generator to
Purity Check field (white screen) to stabilize the CRT. the Receiver. The Brightness level should not
Fully degauss the Receiver by using an external be higher than necessary to obtain a
degaussing coil. clear pattern.
Press the Recall button on the Remote Control again
Converge the red and the blue dots at the center of the
until the Purity Check (green screen) appears.
screen by rotating the R & B pole Static Convergence
For a 2-piece assembly (see Fig. 5): Magnets.
Loosen the deflection yoke clamp screw and move the Align The converged red/blue dots with the green dots
deflection yoke back as close to the purity magnet as at the center of the screen by rotating the R & B & G
possible. pole Static Convergence Magnets. Melt wax with
Adjust the Purity rings to set the vertical green raster soldering iron to reseal the magnets.
precisely at the center of the screen (see Fig. 10). 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.
Figure 10. Green Raster 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
Slowly move the deflection yoke forward until the best and CRT and place tape over the tab to secure to the
overall green screen is displayed. CRT.
For a 1-piece assembly (see Fig. 8): PermalloyConvergenceCorrectorStrip(Part
Slowly move the deflection yoke and purity rings No. 0FMK014ZZ)
assembly toward the CRT board and adjust the purity
magnet rings to set vertical green raster at center of This strip is used in some sets to match the yoke and
screen (see Fig. 10). CRT for optimum convergence. If the yoke or CRT is
Gradually move the deflection yoke & purity rings replaced, the strip may not be required.
forward and adjust for best overall green screen. First converge the set without the strip and observe the
corners.
Continue from here for either assemblies:
Tighten the deflection yoke clamp screw.
If correction is needed:
Press the Recall button on the Remote Control again
until the purity check (blue screen) and (red screen) 1. Place strip between CRT and yoke, in quadrant
appear and observe that good purity is obtained on needing correction. Slowly move it around for
each respective field. desired results.
Press the Recall button on the Remote Control again
until Purity check (white screen) appears. Observe the 2. Press adhesive tightly to the CRT and secure
screen for uniform white. If purity has not been with tape.
achieved, repeat the above procedure.
- 12 -
Figure 11. Vertical Yoke Movement
Figure 12. Horizontal Yoke Movement
Figure 13. Convergence Magnets and Wedges Location
Note: For models using 4 pairs of rings
assemblies see Fig. 6 for details
- 13 -
Service 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 b a b a
adjusting mechanical controls individually, many of the B 00 33 C 00 0 255
control functions are now performed by using "On
Screen Display Menu". (The Service Adjustment
Mode.) An address Menu appears in the right
hand corner of the screen
Note: It is suggested that the technician reads all the
way through and understand the following
procedure for Entering/Exiting the Service Figure 14. Service Mode Menu Adjustments.
Adjustment Mode; then proceed with the
Note: Only the applicable settings for the Receiver
instructions working with the Receiver. When
serviced will be available (See a in Fig. 14).
becoming familiar with the procedure, the Flow
Chart for Service Mode may be used as a Exiting the Service Mode:
quick guide. Press the Action and the Power buttons on the
Receiver simultaneously for at least 2 seconds.
Quick Entry to Service Mode:
At times when minor adjustments need to be done to THE RECEIVER EXITS SERVICE MODE
the electronic controls, the method of Entering the
service Mode without removal of the cabinet back is as The Receiver momentarily shuts off; then comes back
follows using the Remote Control: on tuned to channel 3 with a preset level of sound.
1. Adjust VOLUME to minimum (0). Any programmed channels, channels caption data and
2. Set CC Mode (Close Caption) OFF. some others user defined settings will be erased.
3. Select SET-UP icon and select CABLE mode.
4. Select TIMER icon and set SLEEP time for 30, 60
or 90 Min.
IMPORTANT
5. Press ACTION button twice to exit menus. Always Exit the Service Mode
6. Tune to the Channel 124. Following Adjustments.
7. Press the VOL button (decrease) on Receiver.
Red "CHK" appears in the left upper corner.
To toggle between Aging and Service
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 Service and
yellow "CHK" for Aging.
Note: Three additional indicators appear on screen.
One is the five digit usage in hours and the
other two are four digits for V-Chip Main and
Child ratings. Indicators are hexadecimal
numbers.
8. Press the Power Button on the Remote Control to
select one of seven Service Adjustment Modes.
1. B= Service VCJ SUB-DATA adjustments.
2. C= Service VCJ CUT-OFF adjustments.
3. M= Service MTS adjustments.
4. P= Service VCJ adjustments.
5. S= Service OPTIONS (PICTURE) adjustments.
6. X = Service AFC adjustments.
7. "CHK" = Normal operation of CHANNEL and
VOLUME .
- 14 -
Press the POWER Button on the Remote Control to select the Service Adjustment.
For Adjustments:
1.Press Channel Up/Down on the Note: Write Down the original 2.Press Volume Up/Down on the
Remote Control to select one of value set (b in Fig. 14) for Remote Control to adjust the
the available Service Adjustments each address before level of the selected Service
(a in Fig. 14). modifying anything. It is Adjustment (b in Fig. 14).
easy to erroneously adjust
the wrong item.
Default
Sub-Data Adjustment
Level
B0 SUB-COLOR 33
CH
B1 SUB-TINT 36
B2 SUB-BRIGHTNESS 127
CH B3 SUB-CONTRAST 20
CH
B4 R OFFSET-factory preset 0
B5 YNR-factory preset 0
B6 YNR LIM-factory preset 0
Default
Cut-Off Adjustment PW
Level
C0 CUT-OFF R 0 255
C1 CUT-OFF G 0 255
C2 CUT-OFF B 0 255
C3 R DRIVE 80
C4 G DRIVE 80
C5 B DRIVE 80
CH
C6 V-SIZE 127
C7 NOT USED --
C8 NOT USED --
CH
C9 H CENTER 16
CA ACL 1
CB HHS 0
CC OSD SHIFT-factory preset 88
CH
CD ACL-REF-factory preset 74
CE ACL-REF-factory preset 64
CF ACL-REF-factory preset 48
C10 ACL-REF-factory preset 40
C11 ACL-REF-factory preset 31
C12 ACL-REF-factory preset 20 Note: Registers noted
with "factory
C13 ACL-COEF-factory preset 124
preset" should not
C14 ACL-COEF-factory preset 117 be modified.
- 15 -
Default
Cut-Off Adjustment
Level
C15 ACL-COEF-factory preset 94
C16 ACL-COEF-factory preset 80
C17 ACL-WAIT-factory preset 2
CH
C18 ACL-THRESHOLD-factory preset 9
C19 MACROVISION-factory preset 3
CH
C1A OSD SELECT-factory preset 1
C1B KILLER ON-factory preset 6
C1C KILLER OFF-factory preset 20
CH
C1D KILLER TIME-factory preset 3
C1E ACC THRESHOLD-factory preset 17
C1F ACC OFF-factory preset 7
C20 MUTE TIME-factory preset 11
Default
MTS Adjustment
Level
PW
M0 INPUT 33
M1 HIGH-LEVEL SEPARATION 25
CH
M2 LOW-LEVEL SEPARATION 6
M3 AGC ADJ-factory preset 0
Default
VCJ Adjustment PW
Level
S0 SHARPNESS PW-factory preset 3
S1 SHARPNESS OW-factory preset 3
S2 HALFTONE-factory preset 0
S3 TVC DELAY-factory preset 0
S4 TVY DELAY-factory preset 0
S5 GAMMA FOLDING POINT-factory preset 13
S6 VIDEO Y DELAY-factory preset 0
CH
CH
S7 VIDEO C DELAY-factory preset 0
S8 COMB BPF-factory preset 0
S9 COMB 2D-factory preset 1
CH
SA COLOR KILLER LEVEL-factory preset 0
SB KILLER THRESHOLD-factory preset 0
SC ACC SW-factory preset 0
Note: Registers noted
SD ACC AMP OFF1-factory preset 100 with "factory
preset" should not
SE ACC AMP OFF2-factory preset 0 be modified.
- 16 -
Default
VCJ Adjustment (Continued)
Level
SF ACC AMP ON-factory preset 20
S10 ACC AMP CTL-factory preset 3
CH
S11 BGP POSITION-factory preset 21
S12 OSD R-factory preset 30
S13 OSD G-factory preset 30
CH
S14 OSD B-factory preset 30
CH
S15 NOISE KILLER TIME-factory preset 5
S16 NOISE KILLER (ACC)-factory preset 50
S17 HV TIMING-factory preset 2
Default
VCJ Adjustment (Black Expansion)
Level
PW
P0 FORCE BS-factory preset 1
P1 DET ON/OFF-factory preset 1
P2 ROM SEL-factory preset 3
P3 ROM CURVE-factory preset 2
P4 BS ON/OFF-factory preset 1
P5 BS TIME CONSTANT-factory preset 5
P6 THRESHOLD V-factory preset 4
CH
CH
P7 THRESHOLD F1-factory preset 129
P8 THRESHOLD F1-factory preset 1
P9 THRESHOLD OFF1 (EFFECT OFF)-factory preset 35
PA THRESHOLD F2-factory preset 99
PB THRESHOLD F2-factory preset 1
PC THRESHOLD OFF2 (EFFECT OFF)-factory preset 30
PD THRESHOLD F3-factory preset 80
PE THRESHOLD F3-factory preset 1
CH
PF THRESHOLD OFF3 (EFFECT OFF)-factory preset 21
P10 THRESHOLD ON1-factory preset 37
P11 THRESHOLD ON2-factory preset 33
P12 THRESHOLD ON3-factory preset 25
P13 CURVE1-factory preset 3
P14 CURVE2-factory preset 3
P15 CURVE3-factory preset 3
P16 RATIO1-factory preset 0 Note: Registers noted
with "factory
P17 RATIO2-factory preset 2
preset" should not
P18 RATIO3-factory preset 3 be modified.
- 17 -
Default
Default Level
Other Adjustment Level
(Without FM)
(With FM)
X0 AFCT 60 83
X1 AFCB 29 44
CH CH
X2 AFCC 42 64
X3 CLOCK 128 128
TO B ITEMS PW
To Check Purity:
When Receiver is in Service Mode (red "CHK" is displayed), place a jumper in the AG connector between the
terminals (shorting FB signal to ground). Press the Recall Button on the Remote Control to enter the White Purity
Field Check Mode. Remove the jumper from the AG connector and press Recall repeatedly to toggle the Receiver
into the Red/Green/Blue Purity Field Check Modes.
Note: if jumper is not removed, colors will be displayed at high luminosity.
In Aging Mode (factory mode, yellow "CHK" is displayed), place a jumper in the AG connector between the
terminals. Press Recall on the Remote Control to enter the Purity Field Check Mode.
NORMAL
SCREEN
Press Recall again to select desired field.
BLUE GRN. RED WHITE
SCREEN SCREEN SCREEN SCREEN
Figure 15. Purity Check Field Mode.
Helpful Hints
Entering Service 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 Service Mode.
The letter in "CHK" turn red.
(The Volume Up/Down will adjust normally).
(All customer controls are set to nominal level).
IMPORTANT Note: Only applicable settings for
Always Exit the Service Mode the Receiver serviced will be
Following Adjustments. available.
- 18 -
Notes:
- 19 -