4. Y6 COLOR TV CHASSIS INTRODUCTION
The Y6 Series Chassis is a Leader TV Set produced by Philips Consumer Electronics Company
for the 1997 model year. The Y6 is used in TV sets with 13 and 19 inch CRT's. The chassis
orientation in relation to the cabinet is front to rear in the Y6 design (sometimes called "North-
South"), because the chassis is longer in this direction than across. The Y6 tuning system
features 181 channels with on-screen display. The main tuning system uses a tuner along with
two IC's mounted on the Main Chassis, which include a microcomputer IC and a memory IC. The
microcomputer communicates with the memory IC, the customer keyboard, the remote receiver,
the U/V tuner, the TV signal processor, and the audio output IC. The memory IC retains the
settings for favorite stations, customer control settings, and Service/Factory Setup Data.
The chassis features a Very Large Scale Integration (VLSI) IC for TV signal processing. This IC
performs video IF, sound IF, AGC control, horizontal signal processing, vertical signal processing,
horizontal/vertical synchronization, and chrominance/luminance processing. On-screen graphics
generation and closed caption decoding are done within the microcomputer and the signals are
sent to the TV signal processor. The on-screen graphics information is placed on the main signal
within the TV signal processor.
The Y6 chassis features a Switching Mode Power Supply for the main voltage source. A "HOT"
ground reference is used in the primary side of the power supply. A "COLD" (signal) ground from
the secondary of the power supply is used throughout the rest of the chassis. AN ISOLATION
TRANSFORMER IS REQUIRED WHEN DOING SERVICE ON ANY VERSION OF THE NEW
CHASSIS.
5.
6. SIGNAL FLOW
The incoming TV RF signal is applied to the U/V tuner via the antenna and RF input. The
45.75mhz IF signal is developed and amplified within the U/V Tuner. The amplified IF signal is
sent from Pins 10 and 11 of the U/V Tuner to the SAW Filter, 1015. The SAW Filter, produces
bandpass shaping for the IF signal before it is applied to the TV Signal Processor 7225 for
processing. AGC (for the Tuner) and AFT (for the Microcomputer) are developed within 7225
and then routed to the Tuning System for RF Amp gain control and Oscillator frequency
correction. The AGC level is preset at Pin 49 of 7225 by 3264. Further AGC correction is made
at Pin 48 of 7225 by 7250, 7251, 7252, and 7253 by sampling the Sandcastle waveform.
Sound IF signal processing for the Y6 Chassis is performed by coupling the 4.5MHz Sound IF
signal from 7225, pin 7, via a Buffer Amplifier, 7214, and 4.5mhz Band Pass Filter, 1102, and into
7225, Pin 5. Audio is output from Pin 50 and applied to the Smart Sound circuit 7124 and 7116
via 7183. Bass and Treble are controlled by the Microcomputer, 7601, Pins 9 and 10. Audio
from the Smart Sound Circuit is applied to 7121 Pin 2 for the 13" Set or 7120 Pin 3 for the 19"
Set. External Audio from another source is applied to 7225 Pin 6.
Composite video from 7225, Pin 48, is buffered by 7214 and then passed through a 4.5mhz Trap,
1206, to remove any sound products present. The Closed Caption video comes from 7214 and is
applied to the Microcomputer, 7601, Pin 23, via 7607. Composite internal video is applied to
7225, Pin 13, while External video is applied to 7225, Pin 15. This video is applied to an internal
Luminance Chrominance Switch which applies the Luminance signal to an internal Matrix and the
Chroma signal to a Demodulator. The Demodulated R-Y and B-Y are outputted from 7225, Pins
30 and 31, and reapplied to 7225, Pins 28 and 29.
Brightness, Picture, Sharpness, Color, and Tint, control voltages are applied to 7225 from
Microcomputer 7601 via individual Control Lines. Red On Screen Display, Blue OSD, Green
OSD, and Fast Blanking are applied to 7225 from Microcomputer 7601 via individual lines. The
Red, Green, and Blue signals from 7225 are applied to the CRT Board. On the CRT Board,
these signals are amplified before being applied to the CRT. Drive and Cutoff controls for CRT
Set-Up are located on the CRT board.
Horizontal and Vertical signals are also developed within 7225. There is no adjustment for the
Horizontal Oscillator. The horizontal circuit uses a count down system that gets its base
frequency from the 3.58 Mhz circuit. A DC reference voltage from 3420, Horizontal Centering
Control, is applied to 7225 Pin 39 for adjustment of the Horizontal centering of the video on the
raster.
When the set is turned On, a High is Output from 7601 Pin 19 to provide pull up voltage for 7225
Pin 37. The Horizontal Drive from 7225 Pin 37 is sent to 7440 and 7441, Horizontal Driver and
Pulse Shaping circuit. Horizontal drive is then applied to the Base of 7445 to drive 5445, the
Integrated Flyback Transformer. A horizontal pulse is also made available for the chassis from
the output circuit of the Horizontal Output transistor. The IFT develops the High Voltage, Screen
Voltage, Focus Voltage, and Filament Voltage for the Picture Tube. Scan derived voltages
provided by the IFT for use by the chassis are the 160V, 26V, 5.5V, and 9V Sources. If the
Voltage output from 5445 goes high, a sample is sent to 6651, 9.1V zener, turning On 7650, and
causing 7601 Pin 16 to go Low. The Microcomputer 7601 turns the set Off. A High at 7601, Pin
19, also turns on 7668 which is connected to the 9V Scan Derived Supply via 6651. If the 9V
Scan Derived Supply fails, 7601 Pin 16 goes Low turning the Set Off. The High at 7601 Pin 19 in
addition, turns 7608 Off, turning 7609 On, switching the Scan Derived 5.5V Source to 7601 Pin
7.
8. 38.
The Vertical signal is output from 7225 Pin 43 and is applied to the Vertical Output Integrated
Circuit 7401. The vertical signal is output from 7225 and applied to the Vertical Yoke. Feedback
from the vertical circuit is fed to 7225, Pin 41. Vertical Sync is output to 7681 and the
Microcomputer 7601 Pin 37 to synchronize on screen display and closed caption.
POWER SUPPLY
Y6 CHASSIS POWER SUPPLY
When a 120Vac Source is connected to the Y6 Chassis, approximately 160Vdc is developed by
the Bridge Rectifier circuit. The 160 volts dc goes through 5545 to the FET switch. The start
voltage for the Switching Mode Power Supply is taken from the hot leg of the input ac.
The Power Supply consists of a single integrated circuit operating as a Free-Running Switching
Mode Power Supply. The frequency of operation varies with the circuit load. There is no
separate power supply for standby; instead, the Power Supply turns On when AC is applied. The
Switching Regulator IC starts switching when the initial voltage is applied through the Startup
circuit. The Switching Regulator turns the Switch On and Off to allow current flow through the
primary of transformer 5545. Energy stored in the primary during the On-time is delivered to the
secondaries during the Off-time. Feedback from the HOT secondary is used to control the
Switching Regulator. Positive Voltage from the HOT secondary is used as B+ for the Switching
Regulator.
The voltages needed to operate the television are developed from the secondaries of 5545.
The Y6 Power Supply is a pulse width modulated, fixed frequency, switching mode power supply.
The Power Supply features a Slow Start and has Overvoltage, Under voltage, Overload, and
Under-load protection. Feed back is accomplished by sensing the voltage of the Hot ground
secondary winding. In the Standby Mode, the operating frequency of the supply is approximately
20KHz. It switches to 70KHz in the Full Power mode. The Power Supply maintains constant
output voltages in both the Standby and Full Power modes. The output secondaries are 10 to 14
volts for the Audio Circuit, 95 volts for the Horizontal Drive, and 10 volts for the Horizontal
Oscillator. The 10 volts supply is fed to a 5 volt regulator, 7500 to produce 5 volts for the
microprocessor.
9.
10. Chassis Identification And Interchangeability Notice
Chassis Identification
An identification label is located on the outside of the cabinet back. The first two characters (19)
indicate the screen size of the television and the next two characters (Y6) identify the basic
chassis series. The next four numbers (7562) following the '04', indicate the Service Manual
number for the chassis. Minor changes may not be identified within the letters, however, they will
be called out on the schematic as Early Production (E.P.) and Late Production (L.P.) changes.
When ordering parts or requesting technical assistance or information, the complete chassis
number must be supplied (e.g. 19Y604-7562).
Interchangeability Notice
Important: While the following holds true in most cases, always refer to the most up-to-
date information for confirmation of interchangeability.
The 8 digit Base Number identifies a family of assemblies. The remaining 4 characters (called the
Group No.) indicate the type of INTERCHANGEABILITY within the family.
Example: 00EMY627 A001
Base No. Group No.
Note: Families having different Base Numbers cannot be interchanged.
The ninth digit (first digit of the group number) identifies the group
INTERCHANGEABILITY level. This will be an alpha character. Higher groups may replace
lower groups, but lower groups cannot be substituted for higher groups.
Example: 00EMY627 A001 00EMY627 B002 00EMY627 C003
00EMY627 B002 CAN BE REPLACED BY A C003 BUT NOT BY AN A001. IN ADDITION, A
C003 CAN BE USED IN PLACE OF EITHER A B002 OR AN A001.
The last two digits of the identification number indicate running changes. When a
particular identification number is initially assigned, it will be a001. Any change which
does not significantly change the operational characters or the external wiring
configuration, is a running change within the group. It allows bi-directional
INTERCHANGEABILITY within the group.
Example: A001 can be used in place of A003, and A003 can be used in place of A001.
However, if a significant change does occur (which will only allow higher revision substitution), the
group identifier (9th position character) must change.
Example:
00EMY627 00EMY627 A002 00EMY627 A003 00EMY627 B004 00EMY627 B005
A001
(Early (Late Production)
Production)
11. Note: 00EMY627 A001 is the initial identification number. All assemblies in the "A" group (9th
position character) are interchangeable with each other. All of the assemblies in the "B"
group are interchangeable with each other, and any "B" group assembly can be
substituted for an "A" group. However, an "A" group assembly cannot be substituted far a
"B" group assembly.
Main Chassis Schematic Notes:
UNLESS OTHERWISE SPECIFIED:
1. ALL WAVEFORMS WERE TAKEN UNDER THE FOLLOWING CONDITIONS:
LINE VOLTAGE MAINTAINED AT 120VAC, 60HZ VIA AN ISOLATION TRANSFORMER
CUSTOMER CONTROLS SET TO MID-RANGE.
2. VOLTAGES SHOWN WITHOUT BRACKETS AND ALL WAVEFORMS WERE TAKEN
WITH AN NTSC SIGNAL GENERATOR DELEVERING 10mVp-p AT ANTENNA
TERMINALS.
3. VOLTAGES SHOWN WITHIN BRACKETS WERE TAKEN WITH NO SIGNAL APPLIED;
THEY ARE LISTED ONLY WHERE AN APPRECIABLE CHANGE WAS NOTED.
4. VOLTAGES SHOWN ENCLOSED WITHIN RECTANGLES WERE TAKEN WITH THE
SET IN STAND-BY MODE (POWER SUPPLIED TO THE CHASSIS), SET TURNED OFF.
5. ALL VOLTAGES ARE POSITIVE DC WITH RESPECT TO GROUND AND VARY DUE
TO NORMAL PRODUCTION TOLERANCES.
6. *= INDICATES A COMPONENT THAT WILL VARY DEPENDING ON SCREEN SIZE,
PRODUCTION DATES AND OPTIONAL FEATURES INSTALLED. PLEASE SEE
THE REPLACEMENT PARTS LIST FORSPECIFIC PART INFORMATION.
= INDICATES THESE COMPONENTS ARE SMD "CHIP TYPE" COMPONENTS
AND AS SUCH WILL BE LOCATED ON THE BOTTOM SIDE OF THE PCB.
7. SPARK GAPS SHOWN ON THE CRT SCHEMATIC ARE INTERNAL TO THE CRT
SOCKET.
INDICATES THE NEED FOR A HIGH VOLTAGE SCOPE PROBE (100: 1).
THESE WAVEFORMS (#27) AT PINS 3 THROUGH 7 OF IC7600 IS PULSE WIDTH
MODULATED.THE FREQUENCY WILL VARY DEPENDING UPON CUSTOMER
CONTROL SETTINGS
THESE VOLTAGES WILL VARY SUBSTANTIALLY DEPENDING UPON G2 AND
CUTOFF CONTROL SETTINGS (WHICH WILL VARY DEPENDING UPON THE
CHARACTERISTICS OF A PARTICULAR PICTURE TUBE). VOLTAGES WILL ALSO
VARY DEPENDING UPON CUSTOMER CONTROL SETTINGS. (SEE NOTE ONE)
12. 11. THE NUMBERS 1 THROUGH 41, WITHIN RECTANGLES, CORRESPOND TO
WAVEFORM PHOTOGRAPHS.
12. FOR VOLTAGE, WATTAGE AND TOLERANCE RATINGS OF RESISTORS AND
CAPACITORS PLEASE SEE THE ELECTRICAL REPLACEMENT PARTS LIST.
INDICATES PCEC REPLACEMENT PART NUMBER ONLY.
Waveforms Notes:
THE NUMBERED WAVEFORM PHOTOS TO THE RIGHT REFER TO THE LOCATION OF
THE NUMBERS WITHIN RECTANGLES INDICATED ON THE SCHEMATIC.
1. ALL WAVEFORM PHOTOGRAPHS WERE TAKEN UNDER THE CONDITIONS AS
STATED IN STEP 1 OF THE MAIN CHASSIS SCHEMATIC NOTES.
2. SWEEP TIME/CM SETTINGS ARE SHOWN BELOW PHOTOS IN THE CALIBRATED
POSITION. HORIZONTAL POSITIONING OF THE WAVEFORMS WAS ADJUSTED FOR
MAXIMUM CLARITY.
a. INDICATES THE NEED FOR A HIGH VOLTAGE SCOPE PROBE.
b. 5445 Pin 1 7.5 Vp-p
5445 Pin 7 80 Vp-p
5445 Pin 9 24 Vp-p
c. 5445 Pin 4 54 Vp-p
5445 Pin 5 84 Vp-p
5445 Pin 6 225 Vp-p
d. 5545 Pin 10 34 Vp-p
5545 Pin 11 23 Vp-p
5545 Pin 13 23 Vp-p
5545 Pin 14 200 Vp-p
e. 5545 Pin 1 40 Vp-p
5545 Pin 4 375 Vp-p
f. IC7401 Pin 1 1.4 Vp-p
IC7401 Pin 3 1.3 Vp-p
g. IC7601 Pin 2 3.3 Vp-p
IC7601 Pin 3 4.1 Vp-p
IC7601 Pin 4 3.3 Vp-p
IC7601 Pin 5 4.1 Vp-p
IC7601 Pin 6 4.1 Vp-p
IC7601 Pin 7 4.2 Vp-p
13. Model Parts List
Philips/Magnavox Models
PR1302 C121, C122, C123, C124
PR1302 C121, C122, C123 13" Philips/Magnavox
00APT188 CRT Module 4835 219 57653
00EMY601 Main Chassis 4835 219 28832
PR1302 C124 13" Philips/Magnavox
00APT188 CRT Module 4835 219 57653
00EMY602 Main Chassis 4835 219 28833
Description Part No.
S AC Cord 4835 321 17119
Button (Power) 4835 410 17028
Button (Function) 4835 410 17029
Cabinet Back 4835 432 97676
Cabinet Front 4835 430 17103
Chassis Rail (Right) 4835 432 17937
Chassis Rail (Left) 4835 432 17938
S CRT (C121) (A34JLL40X83) 4835 310 57303
S CRT (C122) (A34JLL40X) 4835 310 57303
S CRT (C123) (370KSB22) 4835 131 27026
S CRT (C124) (A34AGT13X82) 4835 131 27139
S Convergence & Purity (C122, C123) 4835 150 27007
S Degaussing Coil 4835 157 97092
S Deflection Yoke (C121, C124) 4835 150 17141
S Deflection Yoke (C122) 4835 219 47284
S Deflection Yoke (C123) 4835 219 47285
Yoke Wedges (3 used) 4835 535 27001
Speaker, 2"X4", 16 ohm, 4W 4835 240 27026
Remote Transmitter (RC0801/17) 4835 219 17712
Battery f/Remote, 1.5V 4835 138 17001
Owner's Manual 00IB 774 7E001
S = Safety component - Replace with Philips part only.
PR1303 C121, C122, C124
PR1303 C121, C122 13" Philips/Magnavox
00APT188 CRT Module 4835 219 57653
00EMY601 Main Chassis 4835 219 28832
PR1303 C124 13" Philips/Magnavox
00APT188 CRT Module 4835 219 57653
00EMY602 Main Chassis 4835 219 28833
14. Description Part No.
Cabinet Back 4835 432 97676
Cabinet Front 4835 430 17111
Button (Power) 4835 410 17022
Button (Function) 4835 410 17023
IR Lens 4835 432 17941
S CRT (C121) (A34JLL40X83) 4835 310 57303
S CRT (C122) (A34JLL40X) 4835 310 57303
S CRT (C124) (A34AGT13X82) 4835 131 27139
S Convergence & Purity (C122) 4835 150 27007
S Degaussing Coil 4835 157 97092
S Deflection Yoke (C122) 4835 219 47284
Yoke Wedges (3 used) 4835 535 27001
Chassis Rail (Right) 4835 432 17937
Chassis Rail (Left) 4835 432 17938
Speaker, 2"X4", 16 ohm, 4W 4835 240 27026
S AC Cord 4835 321 17119
Remote Transmitter (RC0801/17) 4835 219 17712
Battery f/Remote, 1.5V 4835 138 17001
Owner's Manual 00IB 791 4E001
S = Safety component - Replace with Philips part only.
XR1302 C121, C122
XR1302 C1 13" Philips/Magnavox
00APT188 CRT Module 4835 219 57653
00EMY601 Main Chassis 4835 219 28832
Description Part No.
S AC Cord 4835 321 17119
Button (Power) 4835 410 17028
Button (Function) 4835 410 17029
Cabinet Back 4835 432 97676
Cabinet Front 4835 430 57303
Chassis Rail (Right) 4835 432 17937
Chassis Rail (Left) 4835 432 17938
S CRT (C121) (A34JLL40X83) 4835 310 57303
S CRT (C122) (000A34JLL40X) 4835 310 57303
S Convergence & Purity (C122) 4835 150 27007
S Degaussing Coil 4835 157 97092
S Deflection Yoke (C121) 4835 150 17141
S Deflection Yoke (C122) 4835 219 47285
Yoke Wedges (3 used) (C122) 4835 535 27001
Speaker, 2"X4", 16 ohm, 4W 4835 240 27026
Remote Transmitter (RC0801/17) 4835 219 17712
Battery f/Remote, 1.5V 4835 138 17001
Owner's Manual (English) 00IB 787 4E001
Owner's Manual (French) 00IB 787 4F001
S = Safety component - Replace with Philips part only.
20. S = Safety component - Replace with Philips part only.
FEATURE CHART
PR1302 C1
FEATURES:
Factory Presets
Wake Up
Automatic Cable Detect
PR1303 C1
FEATURES:
Factory Presets
Wake Up
Automatic Cable Detect
XR1302 C1
FEATURES:
Factory Presets
Wake Up
Automatic Cable Detect
HD1918 C1
FEATURES:
Factory Presets
Wake Up
Volume Limiter
Automatic Cable Detect
PR1902 C1
FEATURES:
Factory Presets
Wake Up
Automatic Cable Detect
XR1902 C1
FEATURES:
Factory Presets
Wake Up
Automatic Cable Detect
21. 14LL17 01
FEATURES:
Factory Presets
AV Source
Auto Fine Tuning
14LL17 11
FEATURES:
Factory Presets
AV Source
Auto Fine Tuning
14LX17 03
FEATURES:
Factory Presets
AV Source
Auto Fine Tuning
20LL27 01
FEATURES:
Factory Presets
AV Source
Auto Fine Tuning
20LL27 11
FEATURES:
Factory Presets
AV Source
Auto Fine Tuning
20LX27 03
FEATURES:
Factory Presets
AV Source
Auto Fine Tuning
22. 13Y6(7560)
27 IC7601 pin 7 28 29 30
4.2 V p-p 5 V p-p 0.6 V p-p 5 V p-p
20 usec 5 msec 20 usec 5 msec
31 32 33 34
4.5 V p-p 4.8 V p-p 0.7 V p-p 4.8 V p-p
20 usec 20 usec 20 usec 5 msec
35 36 37
1.6 V p-p 1.25 V p-p 4.6 V p-p
5 msec 0.2 usec 20 usec
34. Service Adjustment Notes:
Unless Otherwise Specified:
1. All service adjustments are "hot" voltagewise. For maximum safety, ensure the use of
properly insulated tools.
2. Refer to the Y6 Chassis Component Location Diagram for quick location of test points
and adjustable components.
3. Grid Locations (Ex.: D-2) next to the reference numbers for the controls refer to the Main
Chassis Printed Circuit Board.
36. Focus Adjustment
1. Tune the set to a local or cable station.
2. Adjust the Focus Control (located on the Flyback Transformer) for best
picture details at high light conditions.
95 Volt Adjustment
1. Place a DC voltmeter on the cathode of 6550.
2. Adjust 3540 (95 Volt Adjust) for 95 volts on the DC voltmeter.
RF AGC Adjustment
1. Tune to a normally snow free station.
2. Adjust potentiometer 3264 (RF AGC Adjust, F-2) to its fully counterclockwise position.
3. Slowly turn potentiometer 3264 clockwise to a point slightly beyond the point of minimum
snow.
NOTE: do not turn the control any further as it may result in an overloaded picture on the face of
the CRT. (Caused by a strong station).
IF AFT Alignment
1. Ensure the set is in Antenna mode (not cable) and tune the receiver to a good local air
signal.
2. Temporarily ground jumper 9689.
3. Place a DC voltmeter at pin 11 of the microcomputer (IC7601)
4. Adjust coil (5260) for 2.5 volts DC on the voltmeter.
Vertical Height Adjustment
1. Apply a crosshatch pattern to the antenna/cable input terminal.
2. Observe the crosshatch pattern on the screen and adjust potentiometer 3410 (F-4)
(Vertical Height Adjust) for slight overscan. (3/8" for 13" models and 1/2" for 19" and 20"
Models.)
Horizontal Centering Adjustment
1. Apply a color bar pattern to the antenna/cable input terminal.
2. Observe the color bar pattern on the screen and adjust potentiometer 3420 (H-2)
(Horizontal Center Adjust) so that the left most color bar and the right most color bar are
the same width.
37. Master Screen (VG2) Control Setup
1. Apply an NTSC color bar signal to the antenna/cable input terminal and tune to the active
channel.
2. Enter the customer control menu by pressing the Menu button on the remote control
transmitter.
3. Set the Brightness, Picture, and Tint controls to midrange, then exit the customer control
menu.
4. Using an oscilloscope, measure and note the peak to peak voltage of each CRT cathode.
Connect the oscilloscope in turn to the leads of resistors 3315, 3335, and 3355, (All of
these controls are on the CRT Board) which connect to the cathodes.
5. After measuring all three voltages, reconnect the oscilloscope to the resistor at which the
highest voltage reading was obtained.
6. Adjust the Master Screen (VG2) Control (located on the flyback transformer) to obtain a
peak to peak voltage reading of approximately 55Vp-p. Note that there will also be a dc
voltage component of the signal.
Degaussing the Television
1. Position the television so that the screen faces the direction it will be facing when in use.
2. Ensure the set is turned off.
3. Move a degaussing coil in a circular motion slowly around the sides and the front of the
set.
4. Withdraw the degaussing coil at least six feet from the television before disconnecting it
from its power source.
Convergence and Purity Adjustment procedure
THE FOLLOWING ADJUSTMENTS SHOULD BE PERFORMED IN THE FOLLOWING ORDER:
PRE-CONVERGENCE PROCEDURE
COLOR PURITY ADJUSTMENT
STATIC CENTER CONVERGENCE ADJUSTMENT
DYNAMIC EDGE CONVERGENCE ADJUSTMENT
Pre-Convergence Procedure
Note: The degaussing procedure should be performed prior to this adjustment.
1. Place the multi-pole Purity and Convergence Assembly with the 2-Y pole purity rings
directly in the gap between the G2 and G3 (focus) grids as shown in figure 2.
2. Apply a center cross or crosshatch pattern to the antenna/cable input terminal.
3. Set potentiometer 3330 (Green Cutoff Control - on CRT Board) to its fully
counterclockwise position.
4. Loosen the yoke clamp screw, pull the yoke back, and remove the three yoke wedges.
5. Slide the yoke all the way forward so that it rests against the bell of the CRT.
6. Tighten the yoke clamp screw so that the yoke does not drop away from the bell of the
CRT.
7. Slowly spread, and if necessary, rotate the 2-Y pole purity rings so that the red and blue
lines are at least parallel and preferably coincide at the 6:00 and 12:00 positions. (Refer
to figure 3.)
38. Figure 2 - Convergence and Purity Assembly
Figure 3 - 2X/2Y Rotate/Spread
Color Purity Adjustment
1. Connect a solid white pattern signal to the antenna/cable input terminal.
2. Set potentiometer 3340 (CRT Board) (Blue Drive Control) to its fully clockwise position.
3. Set potentiometers 3330 (CRT Board) (Green Cutoff Control) and 3350 (Blue Cutoff
Control) fully counterclockwise.
4. Set potentiometer 3300 (CRT Board) (Red Drive Control) fully counterclockwise and
potentiometer 3310 (Red Cutoff Control) fully clockwise.
5. Slowly spread the 2-X pole purity rings to center the red portion of the screen, leaving the
same amount of green on one side of the screen there is blue on the other side.
6. Tighten the yoke clamp screw slightly so that the yoke may be moved with some friction.
7. Proceed to the Static Center Convergence Adjustment.
Static Center Convergence Adjustment
1. Apply a center cross or crosshatch pattern to the antenna/cable input terminal and
observe the screen to ensure that the yoke is not tilted. If necessary, rotate the yoke to
obtain a level raster.
2. Set potentiometer 3330 (Green Cutoff Control-on CRT Board) fully counterclockwise.
3. Set potentiometers 3300 (Red Drive Control-on CRT Board) and 3340 (Blue Drive
Control-On CRT Board) to counter-clockwise.
4. Set potentiometers 3310 (Red Cutoff Control) and 3350 (Blue Cutoff Control-On CRT
Board) fully clockwise.
5. Slowly spread, and if necessary, rotate the 4-pole magnetic rings to converge red and
blue lines at the center of the screen.
39. 6. Set potentiometer 3330 (Green Cutoff Control-On CRT Board) to its fully clockwise
position.
7. Slowly spread, and if necessary, rotate the 6-pole magnetic rings to converge red/blue on
green lines at the center of the screen.
8. Repeat steps five through seven for optimum performance.
9. Proceed to the Dynamic Edge Convergence Adjustment.
Dynamic Edge Convergence Adjustment
Note: To secure the correct position of the deflection yoke, three rubber wedges are used. They
are ultimately to be placed as shown in figure 4c or figure 5c .
1. Apply a crosshatch pattern to the antenna/cable input terminal.
2. Set potentiometer 3330 (Green Cutoff Control-On CRT Board) fully counterclockwise.
3. Tilt the yoke up and down to converge the red and blue vertical lines at the 6:00 and
12:00 positions and the red and blue horizontal lines at the 3:00 and 9:00 positions (refer
to figure 6) . When the correct position has been found, place a rubber wedge between
the yoke and the CRT. If the yoke is tilted up, place wedge one as shown in figure 4a ; if
it is tilted down, place wedge one as shown in figure 5a.
4. Tilt the yoke to the left and right to find the point of best possible convergence of the red
and blue lines at the edges, top and bottom of the screen as shown in figure 7 . When the
correct position is located, place wedges two and three as shown in figure 4b or figure
5b.
5. Remove wedge one and place it in the final position as shown in figure 4c or 5c.
6. Set potentiometer 3330 (Green Cutoff Control-On CRT Board) fully clockwise.
7. Proceed to the White Balance Adjustment.
Figures 4 and 5
Figures 6 and 7
40. White Balance Adjustment
1. Enter the customer menu and set the Picture, Color and Brightness controls to zero.
2. Apply a white raster signal to the antenna input.
3. Turn the Master Screen Control (VG2) fully counter-clockwise.
4. Place a Voltmeter at Pin 3 of the CRT Cathode.
5. Adjust 3350 (Blue Cutoff Control - on CRT Board) for a reading 110 volts DC on the
voltmeter.
6. Place a Voltmeter at Pin 5 of the CRT Cathode.
7. Adjust 3310 (Red Cutoff Control - on CRT Board) for a reading 110 volts DC on the
voltmeter.
8. Place a Voltmeter at Pin 7 of the CRT Cathode.
9. Adjust 3330 (Green Cutoff Control - on CRT Board) for a reading 110 volts DC on the
voltmeter.
10. Apply a crosshatch pattern to the antenna input.
11. Turn the Master Screen Control (VG2) clockwise until the dark areas of the cross hatch
begin to illuminate.
12. Now turn the Master Screen Control (VG2) counter-clockwise until the dark areas are just
extinguished.
13. Apply a color bar pattern to the antenna input (No chroma will be visible).
14. Adjust (in small increments) the cutoff controls (3310 Red Cutoff Control) (3330 Green
Cutoff Control) (3350 Blue Cutoff Control) to make the darkest color bar gray.
15. Adjust the drive controls (3300 Red Drive Control) (3340 Blue Drive Control) to make the
brightest color bar white.
NOTE: the controls will interact. Reduction of the Red Drive may require reduction of the Red
cutoff, etc..
CHASSIS SERVICE MODE
The Y6 chassis service mode provides information about features, software version, and error
codes. Use the following seven-button sequence on the remote control to enter the service mode:
0-6-2-5-9-6-Menu
Note that this sequence must be entered consecutively without allowing the on-screen display to
time out between entries.
To exit the service mode, turn the television off with the remote control transmitter Power button.
When the unit is operating in service mode, all normal on-screen displays are suppressed and
replaced by a special service display. A sample display is shown below.
41. Explanation of Display
The first number (74000 in the example shown above) is a numerical representation of the
features of the set.
The second number (00E8 in the example) is a run timer. This display will increment based on
the amount of time the set has been on.
The third number (1.16.4 in the example) shows the software ID (1), the software version (16),
and the cluster number (4).
The S indicates that the service mode is active.
The five most recent errors are encoded on the following line of the display (in the example
above, no errors have been recorded, because all five registers display zeroes). The most recent
error will be displayed in the register nearest the word "ERROR." The error codes and their
meanings are shown below:
Code Meaning
1 Micro RAM Error
3 EEPROM Checksum Error
6 EEPROM Error
7 Tuner Error (PLL)
The bottom line is a two-letter representation of the features of the set (VI in the example). The
number following the feature code will be either one or zero, depending on whether or not the
feature is active (1 means the feature is active, 0 means it is not). The two-letter codes and their
meanings are shown below:
Code Meaning
VI Factory Presets (the set will go into "setup" mode when turned on)
AC Auto Cable (sets cable/antenna during auto program)
AS Auto Scan (automatic scanning and programming of active channels)
VL Volume Limiter
AV Aux Input
WU Wake Up
Note that if the memory IC (EEPROM) is replaced during service, the microprocessor will write
default values into the EEPROM when the set is initially powered on. No other action is required
of the servicer except to set features.
To exit the service mode and erase the error codes, turn the unit off with the power button on the
remote control, then unplug the ac cord. Breaking the ac ensures that the microprocessor will
42. download new settings from the EEPROM IC when power is reapplied to the set. To save the
error codes, unplug the ac cord without turning off the set. When the power is turned back on, the
service mode will still be active.