Text preview for : 27GX01B.pdf part of Hitachi 27GX01B Hitachi solid state color television
Models:27GX01B-501, 27GX01B-511
Chassis: NA8
Service Manual
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+,7$&+,
SERVICE MANUAL
176& 1$ &+$66,6
PA
No. 0138
27GX01B-501 27GX01B-511
R/C:
CLU-351U
CAUTION: Before servicing this chassis, it is important that the service technician read the "Safety Precaution" and "Product Safety Notices" in this Service Manual.
This television will display television Closed Captioning ( CC or ) in accordance with paragraph 15.119 of the FCC rules.
CONTENTS
SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 PRODUCT SAFETY NOTICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 POWER SOURCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 SERVICE NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 CIRCUITS AND BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . 32 PARTS IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
SOLID STATE COLOR TELEVISION
JUNE 2000 HHEA-MANUFACTURING DIVISION
SAFETY PRECAUTIONS
NOTICE: Comply with all cautions and safety-related notes located on or inside the cabinet and on the chasis or picture tube. WARNING: Since the chasis of this receiver is connected to one side of the AC power supply during operation, whenever the receiver is plugged in, service should not be attempted by anyone unfamiliar with the precautions necessary when working on this type of receiver. The following precautions should be observed: 1. Do not install, remove, or handle the picture tube in any manner unless shatterproof goggles are worn. People not so equipped should be kept away from the picture tube while handling. 2. When service is required, an isolation transformer should be inserted between power line and the receiver before any service is performed on a "HOT" chassis receiver. 3. When replacing a chassis in the receiver, all protective devices must be put back in place, such as barriers, nonmetallic knobs, adjustment and compartment covershields, isolation resistors, capacitors, etc. 4. When service is required, observe the original lead dress in the high voltage circuitry area. 5. Always use the manufacturer's replacement components. Critical components as indicated on the circuit diagram should not be replaced by another manufacturer's. Furthermore, where a short circuit has occurred, replace those components that indicate evidence of overheating. 6. Before returning a serviced receiver to the customer, the service technician must thoroughly test the unit to be certain that it is completely safe to operate without danger of electrical shock, and be sure that no protective device built into the receiver has become defective, or inadvertently defeated during servicing. Therefore, the following checks should be performed for the continued protection of the customer and service technician.
Leakage Current Hot Check Plug the AC cord directly into a 120V AC 60Hz outlet (do not use an isolated transformer for this check). Turn the AC power ON. Using a Leakage Current Tester (Simpson's Model 229 or equivalent), measure for current from all exposed metal parts of the cabinet (antennas, screwheads, overlays, control shafts, etc.). Any current measured must not exceed 0.5 milliamps.
(READING SHOULD NOT BE ABOVE 0.5mA)
DEVICE UNDER TEST LEAKAGE CURRENT TESTER
TEST ALL EXPOSED METAL SURFACES
+
-
2-WIRE CORD
ALSO TEST WITH PLUG REVERSED (USING AC ADAPTER PLUG AS REQUIRED)
EARTH GROUND
AC LEAKAGE TEST ANY MEASUREMENTS NOT WITHIN THE LIMITS OUTLINED ABOVE ARE INDICATIVE OF A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED BEFORE RETURNING THE RECEIVER TO THE CUSTOMER. High voltage This receiver is provided with a hold down circuit for clearly indicating that voltage has increased in excess of a predetermined value. Comply with all notes described in this service manual regarding this hold down circuit when servicing, so that this hold down circuit is operated correctly. Serviceman Warning With minimum BRIGHTNESS, CONTRAST, SHARPNESS, and COLOR, the operating high voltage in this receiver is lower than 28.30kV ±1.25kV. In case any component having influence on the high voltage is replaced, confirm that high voltage with minimum BRIGHTNESS, CONTRAST, SHARPNESS, and COLOR is lower than 28.30kV ±1.25kV. To measure high voltage use a High Impedance High Voltage meter. Connect (-) to chassis earth and (+) to the CRT ANODE button. (See the connection diagram on page 4.)
Note: Turn power switch OFF without fail before the connection to the Anode Button
Leakage Current Cold Check With the AC plug removed from the 120V AC 60Hz source, place a jumper across the two plug prongs. Turn the AC power switch ON. Using an insulation tester (DC500V), connect one lead to the jumpered AC plug and touch the other lead to each exposed metal part (antennas, screwheads, metal overlays, control shafts, etc.), particularly any exposed metal part having a return path to the chassis should have a minimum resistor reading of 0.24M and a maximum resistor reading of 12M. Any resistance value below or above this range indicates an abnormality which requires corrective action. An exposed metal part not having a return path to the chassis will indicate an open circuit.
-2-
Important Safety Notice . . . . . . . . . . . . . . . . . . 2 Safety Precautions . . . . . . . . . . . . . . . . . 2 Product Safety Notice . . . . . . . . . . . . . . . . . . . . 4 Horizontal Oscillator Disable Circuit . . . . 5
Service Adjustments (Electronic Control). . . . . . . . . . . . . . . . . . 28 Sub-Brightness . . . . . . . . . . . . . . . . . . . Sub-Contrast. . . . . . . . . . . . . . . . . . . . . Tint/Color Adjustment . . . . . . . . . . . . . . Color Temperature Adjustment . . . . . . . Horizontal Centering . . . . . . . . . . . . . . . MTS Circuit Adjustment . . . . . . . . . . . . Clock Adjustment (S7) . . . . . . . . . . . . . Vertical Size . . . . . . . . . . . . . . . . . . . . . 28 28 28 29 30 30 31 31
Receiver Feature Table . . . . . . . . . . . . . . . . . . . 6
Location of Controls (Receiver) Receiver Front Control Panel . . . . . . . . . 7 Location of Controls (Remote). . . . . . . . . . . . . 8
Service Adjustments (Mechanical Controls). . . . . . . . . . . . . . . . 31 Focus (Part of T551). . . . . . . . . . . . . . . 31
Audio Signal Path Block Diagram . . . . . . . . . 32 Disassembly for Service . . . . . . . . . . . . . . . . . 13 Disassembly for CRT Replacement . . . . . . . . 13 Chassis Service Adjustment Procedures . . . 14 131.0V B+ Voltage Confirmation . . . . . Source Voltage Chart . . . . . . . . . . . . . . B+ 5V Source Voltages. . . . . . . . . . . . . MPU 5V . . . . . . . . . . . . . . . . . . . . . . . . Stand-by 5V . . . . . . . . . . . . . . . . . . . . . B+ 9V Source Voltage . . . . . . . . . . . . . B+ 12V (Stand-by) . . . . . . . . . . . . . . . . High Voltage Check . . . . . . . . . . . . . . . 14 14 14 14 14 14 14 14 Video-Chroma Signal Path Block Diagrams . . . . . . . . . . . . . . . . . . . . . 33 IC101 VCJ IN/OUT Pins and Functions . . . . . 34 IC001 MPU IN/OUT Pins and Functions. . . . . 35 Components Identification . . . . . . . . . . . . . . . 36 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Purity and Convergence Procedures . . . . . . 15 Serviceman Mode (Electronic Controls) . . . . 18 Entering Serviceman Mode . . . . . . . . . Toggle between Modes. . . . . . . . . . . . . Exiting the Serviceman Mode. . . . . . . . Sub-Data Adjustment . . . . . . . . . . . . . . Cut-Off Adjustment . . . . . . . . . . . . . . . . Pin Cushion Adjustment . . . . . . . . . . . . MTS Adjustment . . . . . . . . . . . . . . . . . . PIP Adjustment. . . . . . . . . . . . . . . . . . . Options Adjustment . . . . . . . . . . . . . . . Comb Filter Adustment . . . . . . . . . . . . . To Check Purity . . . . . . . . . . . . . . . . . . Helpful Hints . . . . . . . . . . . . . . . . . . . . . 18 18 18 19 19 20 20 21 22 23 24 24
Instructional Flow Chart for Serviceman Mode . . . . . . . . . . . . . . . . 25
-3-
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in HITACHI television receivers have special safety-related characteristics. These are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this Service manual. Electrical components having such features are identified with a ! mark in the schematics and parts list in this Service Manual. The use of a substitute replacement component which does not have the same safety characteristics as the HITACHI recommended replacement component, shown in the parts list in this Service Manual, may create shock, fire, X-radiation, or other hazards. Production safety is continuously under review and new instructions are issued from time to time. For the latest information, always consult the current HITACHI Service Manual. [A subscription to, or additional copies of HITACHI Service Manuals may be obtained at a nominal charge from HITACHI Sales Corporation.]
This Service Manual is intended for qualified service technicians; it is not meant for the casual do-it-yourselfer. Qualified technicians have the necessary test equipment and tools, and have been trained to properly and safely repair complex products such as those covered by this manual. Improperly performed repairs can adversely affect the safety and reliability of the product and may void warranty. Consumers should not risk trying to do the necessary repairs and should refer to a qualified service technician. WARNING Lead in solder used in this product is listed by the California Health and Welfare agency as a known reproductive toxicant which may cause birth defects or other reproductive harm (California Health and Safety Code, Section 25249.5). When servicing or handling circuit boards and other components which contain lead in solder, avoid unprotected skin contact with solder. Also, when soldering do not inhale any smoke or fumes produced.
SAFETY NOTICE USE ISOLATION TRANSFORMER WHEN SERVICING
Components having special safety characteristics identified by ! on the parts list in this service manual and its supplements and bulletins. Before servicing this product, it is important that the service technician read and follow the "Safety Precautions" and the "Product Safety Notices" in this Service Manual. For continued X-Radiation protection, replace picture tube with original type or HITACHI equivalent type.
CRT ANODE
HIGH IMPEDANCE H.V. METER
CRT
+
-
POWER SOURCE
CHASSIS GROUND
This television receiver is designed to operate on 120Volt/ 60Hz, AC house current. Insert the power cord into a 120Volts/60Hz outlet.
X-Radiation
TUBE: The primary source of X-Radiation in this receiver is the picture tube. The tube utilized in this chassis is specially constructed to limit X-Radiation emissions. For continued X-Radiation protection, the replacement tube must be the same type as the original HITACHI-approved type. When troubleshooting and making test measurements in a receiver with excessive high voltage problem, avoid being unnecessarily close to the picture tube and high voltage components. Do not operate the chassis longer than is necessary to locate the cause of excessive voltage.
NEVER CONNECT THE TV TO OTHER THAN THE SPECIFIED VOLTAGE OR TO DIRECT CURRENT.
-4-
Service Notes
IMPORTANT: To protect against possible damage to the solid state devices due to arcing or static discharge, make certain that all ground wires and CRT 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. Equipment needed to check the disabled circuit: 1. Voltmeter (0 - 200V scale) 2. High Voltage Meter (0 - 50kV) 3. Variac or Isolation Transformer
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. Set Bright and Picture level to zero (0). 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:
-5-
Receiver Feature Table
FEATURE\MODEL Chassis Tuning system # of channels Menu language Closed Caption V-Chip 75 input Remote Model # Picture tube V/A norm (X=both) MTS/SAP/DBX Volume Correction Built-in audio power # of speakers A/V in (rear/front) Dimensions (HxWxD) Weight (kg/lbs) Power source (V/Hz) Anode voltage Video input jack Audio input jack A-Board TNP2AH017 C-Board TNP2AA047 mm in 27GX01B-501 27GX01B-511 NA8 96K 181 Eng/Span/Fr X X X
HL00761
M68LGLO61X X X X 5Wx2 (10%) 2 3(2/1) 594.8x665.2x544.5 23.4x26.1x21.4 38/83.6 120/60
28.30kV ±1.25kV
1Vp-p 75, phono jack 500mV RMS 47k AD 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
6
Figure 1. Location of Controls Receiver
Quick Reference Control Operation
Quick Reference Control Operation
1
Power Button - Press to turn ON or OFF. Volume Buttons - Press to adjust Sound Level, or to adjust Audio Menus, Video Menus, and select operating features when menus are displayed Channel Buttons - Press to select programmed channels. Press to highlight desired features when menus are displayed. Menu Button - Press to display Main Menu and access On Screen feature and Adjustment Menus. Input Button - Press to select TV or one of two Video Inputs. Front AV In Jacks - Front audio, video and earphone jacks. -7-
2
3
4
5
6
Location of Controls (Remote)
REMOTE CONTROL
Power Button Press to turn On or Off. Mute Button Press to mute sound. A second press resumes sound. Press also to toggle Closed Captioning. Input Button Press to select TV or video input. Menu Button Press to display main menu and access or exit onscreen features or Adjustment menus. Recall Button Press to display Time status of sleep timer, channel, video mode, channel I.D. and audio mode. Precoded VCR Buttons These buttons transmit the chosen precoded VCR codes.
POWER TV CABLE VCR
REMOTE CONTROL
Mode Buttons These buttons allow the remote to control your TV, VCR, or cable box depending on which mode button is selected. Channel Buttons Press to select channels. Keypad Buttons Press desired channel number to access channel. Volume Buttons Press to adjust TV sound level. LST-CH (Last Channel) Button Press to switch to the previously tuned channel.
1 4 7
MUTE
2 5 8 0
SLEEP
3 6 9
LST-CH
CH CH VOL
VOL
INPUT
CURSOR CONTROL
MENU RECALL REC STOP
PAUSE
TV/VCR
tt
t
uu
Sleep Button Press to turn TV Off in 30, 60, or 90 minutes. Cursor Button Press to adjust Audio menus, Video menus, and select operating features when menus are displayed.
HITACHI
CLU-351U
Figure 2. Location of Controls (Remote)
-8-
Remote Control Quick Reference Functional Key Chart
Key
POWER TV CABLE VCR INPUT TV Selects the TV Input Mode
Operates
Turns TV On and Off Turns Cable Box On and Off Turns VCR On and Off
MENU TV Activates and Exits TV Menus
1 4 7
2 5 8 0
3
Selects Channel TV Selects code in Video Lock Menu Selects Channel in Channel I.D. Menu Selects Channel in Timer Menu
6 9
VCR CABLE
Selects Precoded VCR codes when programming remote Selects Precoded CABLE codes when programming remote
RECALL TV Display Channel, Time, Channel I.D. and Audio Mode
TV
Menu Navigation
CH
TV CH CABLE
Channel Up/Down Channel Up/Down
VOL p
VOL q
TV
Volume Up/Down
-9-
Key
SLEEP TV
Operates
Selects 30, 60 or 90 minutes for Automatic Turn Off. Also use to turn Sleep Timer off by selecting NO
MUTE TV
Mutes TV Audio Access and exit Closed Captioning
LST-CH TV Select previously tuned channel
Mode Selection Buttons TV
CABLE
TV CABLE VCR
Selects TV Mode for the remote control Selects Cable Mode for the remote control Selects VCR Mode for the remote control
VCR
Standard VCR Control Buttons REC VCR Record
VCR
Rewind
VCR
Fast Forward
VCR STOP VCR PAUSE VCR TV/VCR
Play
Stop
Pause
VCR CABLE
Selects TV or VCR Mode Selects A/B Mode
- 10 -
Using the Remote to Control VCR and Cable box Funtions
Operating the Precoded Function for Your VCR
This remote is designed to operate different types of VCRs. You must first program the remote to match the remote system in your VCR. (Refer to the VCR Code Index section.) 1. Turn on your VCR. 2. Aim the remote control at the front of your VCR. 3. Press the VCR button to switch to VCR precoded mode. 4. While holding down the VCR button, enter the 2-digit preset code that matches your VCR*. The remote will turn on your VCR when the correct 2-digit preset code is entered. When this occurs, the remote control is programmed for your VCR. If your VCR does not turn off after 5 seconds, try a different 2-digit preset code. 5. The remote will now control your VCR.
Operating the Precoded Function for Your Cable Box
1. Turn on your cable box. 2. Aim the remote control at the front of your cable box. 3. Press the cable box button to switch to cable box precoded mode. 4. While holding down the CABLE button, enter the 2-digit preset code that matches your cable box*. The remote will turn on your cable box when the correct 2-digit preset code is entered. When this occurs, the remote control is programmed for your cable box. If your cable box does not turn off after 5 seconds, try a different 2digit preset code. 5. The remote will now control your cable box.
POWER
TV
CABLE
VCR
1 4 7
MUTE
2 5 8 0
SLEEP
3 6 9
LST-CH
CH CH VOL
VOL
INPUT
CURSOR CONTROL
MENU RECALL REC STOP
NOTES:
PAUSE
·
NOTES:
· If your VCR cannot be operated after performing the above procedures, this means that your VCR codes have not been precoded into the remote. In the unlikely event that your VCR cannot be operated after performing the above procedures, consult your VCR operating guide. The remote control will remember the codes you have programmed in until the batteries are removed. After replacing the batteries repeat the entire programming procedure stated above. If your VCR does not have a power function, the remote will issue the CHANNEL UP function.
TV/VCR
tt
t
uu
·
If your cable box cannot be operated after performing the above procedures, this means that your cable box codes have not been precoded into the remote. In the unlikely event that your cable box cannot be operated after performing the above procedures, consult your cable box operating guide. The remote control will remember the codes you have programmed in until the batteries are removed. After replacing the batteries repeat the entire programming procedure stated above. If your cable box does not have a power function, the remote will issue the CHANNEL UP function. For some models, the remote control's channel and will control the cable box channel. The number buttons will control your television channel although you are in cable mode.
HITACHI
CLU-351U
·
· * (Codes are listed on page 12)
·
·
·
·
- 11 -
VCR and Cable Box Codes Index
The remote is capable of operating many brands of VCRs and cable boxes. You must first program the remote control to match the remote system in your VCR or cable box. NOTE: The remote control memory is limited. Some models of VCRs or cable boxes may not operate. The remote control is
not designed to control all features that are available in all models.
Code Index For VCRs
VCR Brand
Emerson Funai GE Hitachi JVC Magnavox Mitsubishi Panasonic RCA Sony Toshiba Zenith
Code (s)
00,01,10,16,23,33, 37,40, 43 00 09,22 00,14,15 14,26 09,12,28 16,23,26,45 09,35,46 15,22 06,07,08,09 16,17,42 07,08,12
Code Index for Cable Boxes
Cable Box Brand
G.I. Jerrold Magnavox Philips Pioneer Samsung Scientific Atlantic Zenith 09 03, 09, 10, 12, 13, 51 40 40 39 39 04, 06, 14, 52, 56 00
Code(s)
- 12 -
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 retainer plate of the AC power cord. · 1 screw by the Flyback assembly. · 1 screw by the A/V jacks.
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.
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.
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 removed 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 re-install into cabinet. Verify that all ground wires and circuit board plugs get connected.
C-Board - CRT Output
Plugs into the socket on the CRT neck.
Speakers
Each 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.
- 13 -
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 6501 SP
A-BOARD
IC 451 A7 IC 551
IC 001 1 IC 002 64 IC 552
COLD (
)
Q501
A8
HOT (
)
RL801 32 33 IC 2302 IC 803 A11 IC 101 C809 Q551
A31
1
52
A32
T U N E R
Figure 3. A-Board Main Components and Test Points
IC 4402
26
27 A61
F801 TPD9 TPD8 D554
FA1
CLK
TP
DATA TP15 FA2
IC 2321
C552
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.
MPU 5V:
Emitter Q002 = IC001 (VDD, AVDD).
Stand-by 5V:
IC001 (key in 1), I2C EEPROM (IC002), Remote Receiver.
B+ 9V Source Voltage
IC551 pin 3 = IC101 (IF 9V), Tuner (BM).
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. C572 (+) +5.0V ± 0.25V TPD9 +13.0V ± 2V C552(+) +8.0V ± 1V TPD8 +27.4V ± 2V IC551 pin3 +9.0V ± 0.5V CATHODE OF D554 +220.0V ± 15V Adjust Picture Menu for normalized video adjustments.
B+ 12V (Stand- by) Note: +16V when power is on
Cathode D001 = RL801 (on-off relay), Q002 (+5V Reg).
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.
B+ 5V Source Voltages Volatile 5V:
C572, + side = IC552 pin 3, Tuner BP, IC101 (IF 5V).
- 14 -
Purity and Convergence Procedure
Adjustment is necessary only if the CRT or the deflection yoke is replaced or if the setting was disturbed. The complete procedure consists of: 1. Vertical Raster Shift Adjustment. (Only for Models with Purity/Convergence Assembly with 4 Pairs of Rings). 2. Initial static convergence. 3. Setting the purity. 4. Final static convergence. For a 1-piece assembly (see Fig. 7): Position like tabs of purity devices together at 12 o'clock to reduce any magnetic field effect. (For better results, note part number and look for specifications at Service Center)
When the CRT or the Yoke is Replaced
Place the yoke on the CRT neck (do not tighten the clamp). For a 2-piece assembly (see Fig. 4): Position purity/convergence assembly as shown and tighten clamp snugly. Remove the hot-melt glue seal on assembly and position like tabs of purity device together at 12 o'clock to reduce its magnetic field effect.
R&B Convergence Rings R&B&G Convergence Rings Purity Rings Centered Over G3/G4 Gap
Figure 7. Positioning of Purity/Convergence Assembly (1-piece assembly)
For either assemblies: Turn the Receiver ON. Operate the Receiver for 60 minutes using the first Purity Check field (white screen) to stabilize the CRT. Fully degauss the Receiver by using an external degaussing coil. Slide the deflection yoke back and forth on the neck of the CRT until it produces a near white, uniform raster.
G3
G4
Figure 4. 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. 5 and Fig. 6)
R&B Convergence Rings R&B&G Convergence Rings Purity Rings Centered Over G3/G4 Gap
G3
G4
Vertical Raster Shift Ring
Figure 5.
Positioning of Purity/Convergence Assembly (4 Pairs of Rings)
Vertical Raster Shift Adjustment (Only for Models with Purity/Convergence Assembly with 4 Pairs of Rings). Apply a green pattern with a horizontal line, adjust the Deflection Yoke so that has no tilt, then secure it. Adjust center line of the pattern with the mechanical center of the CRT, this center is determined by two marks at the side edges of the screen. To adjust the line, once the vertical raster shift tabs are place at 3 o'clock to reduce its magnetic field effect (see Fig. 5 and Fig. 6) 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. 8)
Center line from pattern
R&B&G Convergence Rings R&B Convergence Rings
90o
Mechanical Center Marks
Open the same angle from center
Vertical Raster Shift Rings
Vertical Raster Shift tabs
Figure 8.
Purity Rings
Vertical Raster Shift Adjustment (4 pairs of rings assembly)
Figure 6.
Positioning of Purity/Convergence Assembly (4 Pairs of Rings)
- 15 -
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.
Final Convergence Procedure (see Fig. 10
through Fig. 12): 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.
Note:
Precise convergence not important.
at
this
point
is
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. 4): 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. 9).
NOTES: 1. CRT warm up with white screen (three guns activated) is needed to stabilize the shadow mask expansion. 2. Initial center static convergence (roughly centers three gun beams) is required in order to perform purity adjustment.
Permalloy Convergence Corrector Strip (Part No. 0FMK014ZZ)
This strip is used in some sets to match the yoke and CRT for optimum convergence. If the yoke or CRT is replaced, the strip may not be required. First converge the set without the strip and observe the corners.
Figure 9. Green Raster Adjustment
Green Raster
If correction is needed: 1. Place strip between CRT and yoke, in quadrant needing correction. Slowly move it around for desired results. 2. Press adhesive tightly to the CRT and secure with tape.
Slowly move the deflection yoke forward until the best overall green screen is displayed. For a 1-piece assembly (see Fig. 7): 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. 9). 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.
- 16 -
G R B
As the yoke is tilted vertically, the rasters produced by the outside guns rotate in opposite directions.
Figure 10. Vertical Yoke Movement
Raster produced from one of the outside electron beams Raster from the other side electron beam Static convergence magnets are set for center convergence As the yoke is tilted horizontally, one raster gets larger while the other gets smaller Figure 11. Horizontal Yoke Movement
R G B
Static Convergence Magnets Converges R/B with G Purity/Convergence Assembly Clamp Converges R with B
11 o'clock Position
Double sided adhesive tape
3 o'clock Position Yoke Positioning Wedges for Dynamic Convergence 7 o'clock Position Figure 12. Convergence Magnets and Wedges Location
Purity Rings Adj. on Green Raster
Note:
For models using 4 pairs of rings assemblies see Fig. 5 for details
- 17 -
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 CLOCK icon and set SLEEP time for 30 Min. 3. Press MENU button twice to exit menus. 4. Tune to the Channel 124. 5. Adjust VOLUME to minimum (0). 6. Press the VOL button (decrease) on Receiver. Red "CHK" appears in upper corner.
To toggle between Aging and Serviceman modes:
While the "CHK" is displayed on the left top corner of the CRT, pressing the Action and the Volume Up buttons on the Receiver simultaneously will toggle between the modes. Red "CHK" for Serviceman and yellow "CHK" for Aging. 7. Press the Power Button on the Remote Control to select one of seven Serviceman Adjustment Modes. 1) B= Serviceman VCJ SUB-DATA ADJUSTEMENT. 2) C= Serviceman VCJ CUT-OFF ADJUSTMENT. 3) D= Serviceman PIN CUSHION ADJUSTMENT. 4) M= Serviceman MTS ADJUSTMENTS. 5) P= Serviceman PIP ADJUSTMENT. (Models with PIP only) 6) S= Serviceman OPTIONS ADJUSTMENTS. 7) X = Serviceman COMB FILTER ADJUSTMENT. 8) "CHK" = Normal operation of CHANNEL and VOLUME .
b
a
32 B 0
b
2 215 C 0
a
Note: Only the applicable settings for the Receiver serviced will be available (See a in Fig. 13).
An address Menu appears in the right hand corner of the screen
Figure 13. Serviceman Mode Menu Adjustments.
Exiting the Serviceman Mode:
Press the Menu 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.
- 18 -
Press the Power Button on the Remote Control to select the Serviceman Adjustment .
For Adjustments:
1.Press Channel Up/Down on the Remote Control to select one of the available Service Adjustments (a in Fig. 13).
Note: Write Down the original value set (b in Fig. 13) 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. 13).
Sub-Data Adjustment B0 B1 B2 B3 B4 B5 CH B6 B7 B8 B9 BA SUB-COLOR SUB-TINT SUB-BRIGHTNESS SUB-CONTRAST SUB-TINT VIDEO SUB-COLOR VIDEO SUB-TINT COMP SUB-COLOR COMP SUB SHARP TV/VIDEO SUB SHARP S-VHS/COMP SUB-CONTRAST FIXED
Default Level 31 31 31 16 16 16 63 31 10 31 15 CH CH
Cut-Off Adjustment C0 C1 C2 CH C3 C4 C5 C6 C7 CUT-OFF R CUT-OFF G CUT-OFF B USER BRIGHTNESS G DRIVE B DRIVE DRIVE C TEMP CONTRAST C TEMP
Default Level 128 128 128 31 64 64 8 5
PW
PW
To D Items.
IMPORTANT NOTE:
Always Exit the Serviceman Mode Following Adjustments.
Note: Some adjustments modes may not be available in some models depending on available options.
- 19 -
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. 13).
Note: Write Down the original value set (b in Fig. 13) 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. 13).
Pin Cushion Adjustment D0 D1 D2 D3 D4 D5 CH D6 D7 D8 D9 DA H POSITION V SIZE V S CORRECTION V LIN CORRECTION E/W TRAPEZIUM V AGC V POSITION V CENTERING V CENTERING DAC SW V-BLK START PHASE V-BLK STOP PHASE
Default Level 16 31 4 14 8 CH 1 1 63 0 12 14 PW CH
MTS Adjustment M0 CH M1 M2 INPUT LEVEL LOW-LEVEL SEPARATION HIGH-LEVEL SEPARATION
Default Level 33 6 25 PW
To P Items.
Note: Some adjustments modes may not be available in some models depending on available options.
IMPORTANT NOTE:
Always Exit the Serviceman Mode Following Adjustments.
- 20 -
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. 13).
Note: Write Down the original value set (b in Fig. 13) 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. 13).
PIP Adjustment P0 P1 P2 P3 P4 CH P5 P6 P7 P8 P9 PA PB PC PD PIP COLOR PIP TINT PIP BRIGHTNESS PIP CONTRAST UP 1/9 DOWN 1/9 LEFT 1/9 RIGHT 1/9 UP 1/16 DOWN 1/16 LEFT 1/16 RIGHT 1/16 PIP FREERUN PIP YDL
Default Level 92 54 22 80 26 143 CH 10 101 26 160 10 116 N/A 4 PW CH
To S Items.
Note: Some adjustments modes may not be available in some models depending on available options.
IMPORTANT NOTE:
Always Exit the Serviceman Mode Following Adjustments.
- 21 -
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. 13).
Note: Write Down the original value set (b in Fig. 13) 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. 13).
OPTIONS Adjustment S0 S1 S2 S3 S4 CH S5 S6 S7 S8 S9 SA SB SC ABL GAIN ABL POINT RGB BRIGHTNESS RGB GAMMA COLOR GAMMA VSM-G BS POINT CLOCK ADJUST LOUD COMP CAPTION DIG FILTER SW CAPTION SCROLL RGB MATRIX RGB MATRIX COMP
Default Level 3 3 8 1 1 0 7 128 31 0 1 6 5 PW CH CH
To X Items.
Note: Some adjustments modes may not be available in some models depending on available options.
IMPORTANT NOTE:
Always Exit the Serviceman Mode Following Adjustments.
- 22 -
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. 13).
Note: Write Down the original value set (b in Fig. 13) 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. 13).
Comb Filter Adjustment X0 X1 X2 X3 X4 X5 X6 X7 X8 CH X9 XA XB XC XD XE XF X10 X11 X12 CLIP LEVEL CSOK COMB LIMIT COMB CORE COMB RF DELAY COMB VIDEO DELAY COMB VMLM COMB VMCO COMB SHARP COMB VM LEVEL COMB VMPKF H LOCK MODE H LOCK H SEP 1 H SEP 2 SUB H LOCK MODE SUB H LOCK SUB H SEP1 SUB H SEP2
Default Level 152 12 24 41 20 CH 18 90 24 123 255 1 1 70 313 266 0 70 313 266 PW CH
To B Items.
Note: Some adjustments modes may not be available in some models depending on available options.
IMPORTANT NOTE:
Always Exit the Serviceman Mode Following Adjustments.
- 23 -
To Check Purity:
Press the Recall Button on the Remote Control when in Serviceman Mode (red "CHK" is displayed) to enter the Purity Field Check Mode.
NORMAL SCREEN
Press Recall again to select desired field.
BLUE SCREEN GRN. SCREEN RED SCREEN WHITE SCREEN
Figure 14. Purity Check Field Mode.
Helpful Hints Entering Serviceman Mode (Back-Open Method)
1. While the Receiver is ON and operating in Normal Mode, momentarily short test point FA1 (TP8) to Cold Ground ( ) FA2 (TP3) A-Board. The Receiver enters the Aging Mode. Yellow letters "CHK" appear in the upper left corner of the CRT. (The Volume Up/Down will adjust rapidly). 2. Simultaneously press the Menu and the Volume Up buttons on the Receiver Control Panel. The Receiver enters the Serviceman Mode. The letter in "CHK" turn red. (The Volume Up/Down will adjust normally). (All customer controls are set to nominal level).
IMPORTANT NOTE:
Always Exit the Serviceman Mode Following Adjustments.
- 24 -
Instructional Flow Chart for Serviceman Mode
NORMAL MODE
Momentarily short FA1 to FA2 (
).
AGING MODE
WHITE SCREEN · · ·
RECALL
(ON REMOTE)
Yellow "CHK" appears in upper left corner of screen. Volume Up/Down operate rapidly. Custumer Controls are set to nominal level. QUICK ENTRY TO SERVICEMAN MODE
EXIT
N
Adj. needed?
Y
· · · · ·
Select CABLE Mode. Set SLEEP time for 30 Min. Tune to Channel 124. Adjust Volume to minimum. Press VOL DOWN. On Receiver.
Press Menu + Volume Up Simultaneously (ON Receiver)
GRN. SCREEN
BLUE SCREEN
SERVICEMAN MODE
· · · "CHK" turns red. Volume Up/Down operate normally. Costumer Controls are set to nominal level.
C
RED SCREEN
WHITE SCREEN
RECALL
(ON REMOTE)
Adj. N needed?
EXIT
Press Menu and Power on the Receiver simultaneously for at least 2 seconds.
Y
POWER
(ON REMOTE)
CH
ON REMOTE CONTROL TO SELECT ADJUSTMENT ON REMOTE TO ADJUST THE LEVEL
SUB-DATA ADJUSTMENTS. B ITEMS.
VOL VOL
POWER
(ON REMOTE)
Note: Some adjustments modes may not be available in some models depending on available options.
IMPORTANT NOTE:
A
Always Exit the Serviceman Mode Following Adjustments.
Figure 15. Flow Chart for Serviceman Mode.
- 25 -
Instructional Flow Chart for Serviceman Mode - Continued
A
CUT-OFF ADJUSTMENTS. C ITEMS.
CH
ON REMOTE CONTROL TO SELECT ADJUSTMENT ON REMOTE TO ADJUST THE LEVEL
Y
Adj. needed?
VOL VOL
N
POWER
(ON REMOTE)
PINCUSHION ADJUSTMENTS. D ITEMS.
CH
ON REMOTE CONTROL TO SELECT ADJUSTMENT ON REMOTE TO ADJUST THE LEVEL
Y
Adj. needed?
VOL VOL
IMPORTANT NOTE: N
POWER
(ON REMOTE)
Always Exit the Serviceman Mode Following Adjustments.
MTS ADJUSTMENTS. M ITEMS.
CH
ON REMOTE CONTROL TO SELECT ADJUSTMENT ON REMOTE TO ADJUST THE LEVEL
Y
Adj. needed?
VOL VOL
N
POWER
Note: Some adjustments modes may not be available in some models depending on available options.
(ON REMOTE)
B
Figure 16. Flow Chart for Serviceman Mode (cont).
- 26 -
Instructional Flow Chart for Serviceman Mode - Continued
B
PIP ADJUSTMENTS. P ITEMS.
ON REMOTE CONTROL TO SELECT ADJUSTMENT ON REMOTE TO ADJUST THE LEVEL
CH
Y
Adj. needed?
VOL VOL
N
POWER
(ON REMOTE)
OPTIONS ADJUSTMENTS. S ITEMS.
ON REMOTE CONTROL TO SELECT ADJUSTMENT ON REMOTE TO ADJUST THE LEVEL
CH
Y
Adj. needed?
VOL VOL
N
POWER
(ON REMOTE)
COMB-FILTER ADJUSTMENTS. X ITEMS.
CH
ON REMOTE CONTROL TO SELECT ADJUSTMENT ON REMOTE TO ADJUST THE LEVEL
Y
Adj. N needed?
POWER
(ON REMOTE)
VOL VOL
N
C
EXIT
Press Menu and Power on the Receiver simultaneously for at least 2 seconds.
Figure 17. Flow Chart for Serviceman Mode (cont).
Note: Some adjustments modes may not be available in some models depending on available options.
IMPORTANT NOTE: Always Exit the Serviceman Mode Following Adjustments.
- 27 -
Service Adjustments (Electronic Controls)
Sub-Brightness
Serviceman DAC Adjustment (B2) Adjustment of this control is important for setting proper operation of customer brightness and contrast controls. This adjustment must be made after Sub-Contrast or Color Temperature adjustments are made. Do not adjust SCREEN after the Sub-Brightness is set. Preparation: Apply a color bar signal with 100 IRE white and 7.5 IRE black. (Switch Color to "OFF" on the signal generator.) Operate the Receiver for a minimum of 10 minutes prior to performing this adjustment. Procedure: In the Serviceman Mode for making electronic adjustments, select the DAC adjustment (B2) and adjust until the black starts to look gray. Then decrease the level to the point where gray turns to black. Note: You may set the accurate value following the Preparation steps and the Procedure step No. 2 of the Sub-Contrast adjustment described below. Procedure: 1. In the Serviceman Mode, select DAC SubBrightness Adjustment (B2) and adjust for 1.51.9Vp-p between blanking and 7.5 IRE level. (See video waveforms detail, Fig. 18) 2. In the Serviceman Mode for electronic adjustments, select DAC Sub-Contrast Adjustment (B3) and adjust for 2.0Vp-p ±0.1V white level to black level on video waveform (see video waveforms detail, Fig. 18). 3. Remove the jumper (Preparation step 4).
Tint/Color Adjustment
Serviceman DAC Adjustment (B1) (B0) Preparation: 1. Apply a rainbow color bar signal. 2. Preset the following controls: · Brightness . . . . . . . .Min. · Color . . . . . . . . . . . .Center. · Tint . . . . . . . . . . . . . .Center. · Contrast . . . . . . . . . .Max. · Sharpness . . . . . . . .Min. 3. Connect the oscilloscope to TP47B (A-Board). 4. Connect a jumper from TPD2 to GND ( ). 5. Connect a jumper from IC101 pin 28 to GND ( ). Procedure: 1. In the Serviceman Mode for making electronic adjustments, select DAC Sub-Tint Adjustment (B1). Adjust until the waveform measured is as the one shown in Fig. 19.
A C 123 A to B = 1 unit B to C = 2 units 456789 B 10
Sub-Contrast
Serviceman DAC Adjustment (B3) This adjustment is factory set. Do not adjust unless repairs are made to associated circuit, the CRT Board or when the CRT is replaced. Preparation: 1. Apply a color bar signal pattern with 87.5% modulation, 70% saturated color bar with a 100 IRE white and 7.5 black. Note: The pattern used in this procedure is an EIA color
bar pattern with 87.5% modulation with 100 IRE white and 7.5 black. Correlate the information in this procedure to the pattern used if another signal is used.
TP47B (A-Board)
2. Preset the following controls: · Brightness . . . . . . . .Center. · Color . . . . . . . . . . . .Min. · Contrast . . . . . . . . . . Max. · Sharpness . . . . . . . . Center. 3. Connect the oscilloscope to TP47R. Set the scope time base to 20µs (horizontal). 4. Connect a jumper from TPD2 to ground ( ). .
White Yellow Cyan
Figure 19. TP47B waveform 2. Connect the oscilloscope to TP47G (A-Board). 3. Select DAC Sub-Color Adjustment (B0) and adjust for peak to peak amplitude to be 0.65Vp-p ±0.05V for 27" models as shown in Fig. 20.
TP47G (A-Board)
1 2 3 4 5 6 7 8 9 10
Green Magenta Red Blue Black SYNC TIP
0.65Vp-p±0.05V
2.0Vp-p ±0.1V
Figure 20. TP47G waveform 4. Remove the jumpers (Preparation steps 4 & 5).
1.5V - 1.9V p-p
Figure 18. TP47G waveform - 28 -
Color Temperature Adjustment (B/W Tracking)
Serviceman DAC Adjust. (C0) (C1) (C2) (C4) (C5) Minor Touch-Up Method OBSERVE low and high brightness areas of a B/W picture for proper tracking. Adjust only as required for "good gray scale and warm highlights". 1. LOW LIGHT areas In Serviceman Mode for making electronic adjustments, select Cutoff (C0) RED, (C1) GRN, (C2) BLU and adjust the picture for gray. 2. HIGH LIGHT areas In Serviceman Mode for making electronic adjustments, select Drive (C4) GRN, (C5) BLU and adjust the picture for warm whites.
8. View scope trace at Horizontal rate and adjust the Serviceman Mode DAC (C0) level until a scanning period of 195V above DC ground is measured, as indicated in Fig. 22. 9. Connect the scope to the GRN Cathode (KG). 10. In Serviceman Mode for making electronic adjustments, select the GRN CUTOFF DAC (C1). 11. Press the LST-CH key on the Remote
195V DC 0V DC (Ground) Figure 22. Cathode Waveform, Adjustment Waveform Detail 12. View the scope trace and adjust the Serviceman Mode DAC (C1) for the scanning period to be 195V above DC ground. (See Fig. 22) 13. Connect the scope to the BLU Cathode (KB). 14. In Serviceman Mode for making electronic adjustments, select the BLU CUTOFF (C2). 15. Press the LST-CH key on the Remote. 16. View the scope trace and adjust the Serviceman Mode DAC (C2) for the scanning period to be 195V above DC ground. (See Fig. 22) 17. Turn the Screen Control (part of FBT) slowly clockwise until a color horizontal line appears. 18. With the other two colors Serviceman Mode DAC CUTOFF adjustments (C0) RED, (C2) BLU; increase the colors to create a white horizontal line. 19. Confirm that a good gray scale is established by viewing B/W color bar pattern. 20. In the Serviceman Mode for making electronic adjustments select the DAC DRIVE adjustments (C4) GRN, (C5) BLUE and adjust for warm white in a white color bar pattern. 21. EXIT the Serviceman Mode. 22. Adjust the Picture Menu Video Adjustments Brightness and Contrast from low scale to high scale and check Black and White tracking. 23. If correction is needed: Re-Enter the Serviceman Mode and perform the Minor Touch Up Method. 24. Perform Sub-Brightness Adjustment procedure if needed.
Complete Adjustment
Preparation: 1. Turn the Receiver "ON" and allow 10 minutes warm up at high brightness. 2. Apply a color bar signal with color "OFF". 3. Turn the SCREEN control (part of FBT T551) fully counterclockwise. Procedure: Preset the following Serviceman DACs for best results: · C0 . . . . . . . . . . . . . . 128 · C1 . . . . . . . . . . . . . 128 · C2 . . . . . . . . . . . . . . 128 · C4 . . . . . . . . . . . . . . 64 · C5 . . . . . . . . . . . . . . 64 1. Connect the oscilloscope to C1-2 (CRT-Board). 2. In Serviceman Mode for making electronic adjustment, select the Sub-Bright DAC (B2). 3. Press the LST-CH key on the remote. 4. Observe the oscilloscope waveform at Horizontal rate and adjust the Serviceman Mode Sub-Bright DAC (B2) level until a scanning period of 2.5V above DC ground is measured, as indicated in Fig. 21.
2.5V DC
0V DC
Figure 21. TP35 Waveform 5. Connect the scope to RED Cathode (KR) on the CRT-Board. 6. In the Serviceman Mode for making electronic adjustments, select the RED CUTOFF DAC (C0). 7. Press the LST-CH key on the remote.
- 29 -
Service Adjustments (Electronic Controls, cont.)
Horizontal Centering
Serviceman DAC Adjustment (D0) Preparation: Connect a crosshatch generator. Procedure: 1. In the Serviceman Mode for making electronic adjustments. Select the Horizontal Centering Adjustment DAC (D0) and adjust until the center of the crosshatch pattern is centered on CRT. 2. EXIT the Serviceman Adjustment Mode.
Stereo Separation Adjustment (M1 & M2)
Preparation: 1. Connect an RF signal generator to the RF antenna input. 2. Connect a scope to TPE10. Procedure: 1. Select Stereo Mode in Audio menu 2. Apply the following signal from the RF signal generator: Video: 100 IRE flat field, 30% modulation. Audio: 300Hz, 100% modulation, stereo (left only) (70 ±5dB, 75 OPEN, P/S 10dB). 3. Adjust the MTS Low-Level Separation Adjustment (M1) until the amplitude displayed on the scope is minimum. 4. Apply the following signal from the RF signal generator: Video: 100 IRE flat field, 30% modulation. Audio: 3KHz, 100% modulation, stereo (left only) (70 ±5dB, 75 OPEN, P/S 10dB). 5. Adjust the MTS High-Level Separation Adjustment (M2) until the amplitude displayed on the scope is minimum. 6. Repeat above steps 2 through 5 until the amplitude is at minimum for both signals.
MTS Circuit Adjustments
The MTS Circuit Adjustments require two steps: 1. Input Level Adjustment. 2. Stereo Separation Adjustment.
Input Level Adjustment (M0)
Preparation: 1. Connect an RMS meter with filter jig as shown in Fig. 23.
RMS METER TPE11
10k 4700p
Figure 23. Filter Jig
2. Connect an RF signal generator to the RF antenna input. Procedure: 1. Apply the following signal from the RF signal generator: Video: 100 IRE flat field, 30% modulation. Audio: 300Hz, 100% modulation, monaural (70 ±5dB, 75 OPEN, P/S 10dB). 2. Adjust the MTS Input Level Adjustment (M0) until the voltage measured is 106 ± 6.0mV rms.
- 30 -
Service Adjustments (Electronic Controls, cont.)
Clock Adjustment (S7)
Preparation: Connect the frequency counter from TPS1 (IC001 Pin 13) to cold ground ( ). Note: Frequency Counter probe capacitance should be 8pF or less. Procedure: 1. Turn the Receiver "OFF" with the AC power applied. 2. Measure TPS1 (IC001 pin 13) for the frequency of the waveform and record the reading. 5. Calculate and following formula: set S7 based on the
6 { 244.1406 pin 13 [ Hz ] } S 7 = 128 + 0.901 ×10 ----------------------------------------------------------------244.1406
Note:
Pin 13 measurement will not regardless of the value stored in S7.
change
Vertical Size (D1)
1. Adjust the VERTICAL SIZE DAC control, D1, until the top and the bottom edges of the raster are visible. 2. Adjust the VERTICAL SIZE control, D1, until the top and the bottom of the raster touch the bezel edge. Then advance SIZE control to obtain an approximately 10% overscan. Linearity adjustment is done automatically when the size is being adjusted. (Best results can de obtained with a round test patter.)
Note:
Pin 13 measurement must have at least four digits of resolution following the decimal point. Example: 000.0000
3. Turn the Receiver back "ON". 4. Place the Receiver into Serviceman Mode for making electronic adjustment, select the Clock Adjustment DAC (S7).
Service Adjustments (Mechanical Controls)
Focus (part of T551)
Preparation: Connect a Signal generator and select a dot pattern. Procedure: Adjust the FOCUS control to obtain the sharpest and clearest dot pattern. a. Adjust for best center. b. Adjust for best area between the center and top right corner.
- 31 -
A
Tuner
JK3002 Front A/V Input V L R
IC2201 MTS AN5849S-E1V 14
MPX In L Out R Out
L OUT
Audio Signal Path Block Diagram
IC3001 A/V SW M52790SP 13
LAV3 RAV3 L-AV1 R-AV1 L-AV2 R-AV2 L1 Out R1 Out LRF1 RRF1
21
22 R OUT
Figure 24. Audio Signal Path Block Diagram.
35 33
JK3001 A/V Input 1 L R V2 L2 R2
15 3 5
IC2351 Bass/Tre/Bal Surround CXA2021S 22 1
L In R In L Out R Out
IC2302 Audio Out AN5272
JK3002 L Out
30 28
14 9
5 2
L In R In
7
7 6 2 3 4 5 1 Headphone Jack
- 32 -
A/V Input 2
8 10
R Out
12
VAO L
VAO R
4
JK3004 Variable Audio Out L R Q2409
1
D2343
IC001 MPU MN101C46FTA 17
S-Defeat
Q2410
A
Tuner IC6501 Comb Filter MN82840 18
Y In
JK3001
Y/V1
36
RF1
Video Input 1
PB
PR
2
Video1 V1 Out
Video Input 2
V2
31 22
Y Out
C6529 + C3019 +
Luma In Filter Q6504 Q6509 Q6516
6
Y-YUV Y In
32 24
C Out
7
Video2 Chroma Out Filter Q6501 Q6514 Q6519 Q6505 5V Q603 5V R Out 5V
Luma Out Filter Q6510 Q6502 Q6506
JK3002
Front Video Input 3
V
12 Video3 IC3001 C In 34 A/V SW M52790SP C1 Out 29 45 11
Y-AV2 C-AV2 5V Q201 Y1 Out V2 Out 5V C315
Chroma In A11-1 C1-1
JK3003
Y
C
13
+
C641 A11-2 C1-2
C
S-Video
9 26
+
Video-Chroma Signal Path Block Diagram
Figure 25. Video-Chroma Signal Path Block Diagram.
- 33 27
Q303
38
G Out Sync In B Out
14
A11-3 C1-3
Q351 Q352 Q353
CRT
15 6 3
D014 YM/YS In R In
25
Q302
+
C314
24
CVBS0 CVBS1
4
YM
33
D015
G In
5
IC101 VCJ TA1310BN
B In B-Y In R-Y In
YS 29 IC001 R 32 MPU MN101C46FTA G 31 B
53 30
C225
52
C226
IC101 IN/OUT Pins and Functions (VCJ)
IC101 TA1310BN
Velocity Scanning Modulation Ground Red Input Green Input Blue Input RGB/Half Tone In HD Reference Hold Down V Reg Ground Brightness Control NC Red Output Green Output Blue Output VCC 9V Red Cutoff Green Cutoff Blue Cutoff Noise filter NC NC NC Vertical Output Vertical Feedback Automatic Gain Vertical Ramp Vertical EHT Input 1 2 3 4 5 6 7 8 9 VSM Out GND R In G In B In YS / YM In DC RC 56 BP DET 55 Y In 54 B-Y In 53 R-Y In 52 VCJ 51 DC Restoration Correction Black Peak Detection Luminance Signal Input R-Y Input B-Y Input VCC 5V 3.58MHz Clock Output 3.58MHz X-tal NC NC APC Filter Chroma Input Ground Delayed Y Signal Horizontal Correction Horizontal Oscillation AFC1 detection Vertical Separation Video Sync 9V NC Horizontal Output Flyback Pulse Vertical Drive Pulse NC Ground I2C SDA I/0 I2C SCL Input
Hold Down Reference CW Out 50 Hold Down V Reg X-tal 49 R-Y Out 48 B-Y Out 47 APC 46 Chroma In 45 GND 44 DL Out 43 Bend Correction 42 32 fh VCO 41 AFC1 40 V Sep 39 Y/Sync In 38 DEF VCC 37 Sync Out 36 H Out 35 FBP In 34 VD Out 33 HD Out 32 GND 31 SDA 30 SCL 29
10 RGB Mute 11 ABL In 12 VK Out 13 R Out 14 G Out 15 B Out 16 VCC 9V 17 R Filter 18 G Filter 19 B Filter 20 Noise Filter 21 V Centering 22 EW FB 23 EW Out 24 V Out 25 V NFB 26 V AGC 27 V Ramp 28 EHT V
Figure 26. VCJ IN/OUT Pins and Functions. - 34 -
IC001 IN/OUT Pins and Functions (MPU)
IC001 MN101C46FTB
Remote signal in SDA1 SCL1 AFC1 AFC2 Key Scan 1 Action S-VHS Version FA1 YUV SW +3.3V System Clock Out Volume RFAGC TV / Video Sound Defeat Power Speaker On / Off +3.3V Closed Caption 1 2 3 4 5 6 7 8 9 RMIN P01 P02 ADIN0 ADIN1 ADIN2 ADIN3 P07 ADIN5 VSS 42 OSC1 41 OSC2 40 VDD (VPP) 39 P42 38 P41 37 P40 36 VSYNC 35 NRST 34 YM 33 ROUT 32 GOUT 31 BOUT 30 YS 29 FLASH 28 HSYNC 27 VREFH0 26 CVBS0 25 CVBS1 24 VREF1 23 CLH 22 GND 14.32MHz X-tal 14.32MHz X-tal +3.3V SCL0 SDA0 Not used/open V-Sync NRST YM R Out G Out B Out YS GND H-Sync Closed Caption 0 Closed Caption 0 Closed Caption 1 Closed Caption 1 Closed Caption
10 ADIN6 11 P12 12 MMOD 13 SYSCLK 14 PWM0 15 PWM1 16 P16 17 P17 18 P20 19 PWM5 20 VDD 21 CLL
Figure 27. MPU IN/OUT Pins and Functions. - 35 -
Component Identification
3 screws at the top edge of the receiver
1 screw at the lower edge of the receiver
1 screw by audio out jacks
1 screw on the retainer plate for the AC power cord
1 screw at the lower edge of the receiver
1 screw by the A/V jacks
1 screw by the flyback assembly
Figure 28. Back Cover Removal
- 36 -
Component Identification
CRT (secured to cabinet by 4 screws on corners of CRT) Yoke Anode (high voltage) Degaussing coil
C board
DAG ground
Speaker (4 screws) Tuner
VAO Out A/V jacks
Flyback (T551)
Speaker (4 screws)
Note: After servicing the receiver, remember to dress the cables, as shown.
Figure 29. Rear View
- 37 -
Component Identification
4 8 9
1
2
7
13
3 14
17
12 5 11
6
10
16 15
MTS processor IC2201 is located on the other side of the board.
NO. INTEGRATED CIRCUITS 1 2 3 4 5 6 7 IC 001 MPU IC 002 EEPROM IC 101 VCJ IC 2302 AUDIO IC 2351 BASS/TRE/BAL IC 3001 A/V SWITCH IC 6501 COMB FILTER 8 9 10 11 12
LOCATION OF COMPONENTS CONNECTORS FRONT AV IN FRONT KEYPAD REAR AV IN S-VIDEO IN VAO OUT 13 14 TRANSISTORS Q501 H. DRIVE Q551 H. OUT 15 16 17 VARIOUS T551 (FLYBACK) FUSE TUNER
Figure 30. View of Main Board Assemblies
- 38 -
REPLACEMENT PARTS LIST
Models: 27GX01B-501 & 27GX01B-511 Important Safety Notice: Components printed in BOLD TYPE have special characteristics important for safety. When replacing any of these components use only manufacturer's specified parts.
REF NO. PART NO. DESCRIPTION REF NO. C353 C354 C357 C401 C403 C404 C405 C407 C409 C415 C451 C452 C453 C454 C455 C456 C457 C458 C459 C502 C503 C504 C505 C506 C507 C508 C510 C511 C512 C514 C515 C516 C517 C518 C519 C531 C551 C552 C553 C554 C555 C556 C557 C558 C560 C561 C562 C563 C564 C565 C566 PART NO. TACCW331T50V ECKD3D102KB EEANA1E1R0B ECJ2VB1C104K ECA1HM010 ECA1HM010 ECSF1EE105 ECA1CM100 ECJ2VC1H101J ECJ2VF1H104Z ECA1HM2R2 ECQB1H473JM ECA1VM471 ECA1VM221 ECA1EM222 ECCF1H020CC ECJ2VB1C104K ECA1CM101 ECQM1104JZ ECA1CM221 ECJ2VC1H221J ECQB1H222JM ECJ2VC1H180J ECA1CM471 ECJ2VF1H103Z ECJ2VC1H102J ECCD2H100D ECKD2H821KB ECKD2H101KB ECA1HMR22 ECJ2VC1H222J ECJ2VC1H391J ECJ2VC1H221J ECJ2VC1H151J ECJ2VF1H104Z ECA1EM220 ECA1VM331 ECA1CM331 ECA1CM331 ECKD2H561KB ECA2EM220 ECA1CM102 ECKD2H102KB ECA1CM221 ECEA1HN2R2U ECKD2H561KB ECKD2H561KB DESCRIPTION CAP,C 330PF/50V CAP,C .001UF-K-2KV CAP,E 1.0UF-25V CAP,C .1UF-I-16V CAP,E 1.0UF/50V CAP,E 1.0UF/50V CAP,T 1.0UF/25V CAP,E 10UF/16V CAP,C 100PF-J-50V CAP,C .1UF-Z-50V CAP,E 2.2UF/50V CAP,P .047UF-J-50V CAP,E 470UF/35V CAP,E 220UF/35V CAP,E 2200UF-25V CAP,C 2PF-C-50V CAP,C .1UF-I-16V CAP,E 100UF/16V CAP,P .1UF-J-100V CAP,E 220UF/16V CAP,C 220PF-J-50V CAP,P 2200PF-J-50V CAP,C 18PF-J-50V CAP,E 470UF/16V CAP,C .01UF-Z-50V CAP,C .001UF-J-50V CAP,C 10PF-D-500V CAP,C 820PF-K-500V CAP,C 100PF-K-500V CAP,E .22UF/50V CAP,C .0022UF-J-50V CAP,C 390PF-J-50V CAP,C 220PF-J-50V CAP,C 150PF-J-50V CAP,C .1UF-Z-50V CAP,E 22UF/25V CAP,E 330UF/35V CAP,E 330UF/16V CAP,E 330UF/16V CAP,C 560PF-K-500V CAP,E 22UF-250V CAP,E 1000UF/16V CAP,C .001UF-K-500V CAP,E 2.2UF/50V CAP,C 560PF-K-500V CAP,C 560PF-K-500V CAP,E 220UF/16V
CAPRISTORS
CRA801 CRA802 C001 C002 C003 C005 C006 C008 C010 C013 C016 C017 C018 C020 C021 C022 C024 C025 C026 C032 C033 C034 C043 C044 C047 C048 C201 C224 C225 C226 C301 C302 C303 C307 C309 C310 C314 C315 C320 C321 C322 C323 C324 C330 C331 C337 C342 C351 C352
154-00
TP00842-51 TP00842-51 ECA1CM470 ECJ2VF1H103Z ECA1HM4R7 ECA1CM470 ECJ2VF1H103Z ECJ2VF1H103Z ECJ2VF1H103Z ECA0JM101 ECJ2VC1H101J ECJ2VC1H270J ECJ2VC1H270J ECA0JM331 ECJ2VF1H103Z ECA1EM471 ECA1HM4R7 ECA1HM010 ECA1HM010 ECA1CM331 ECJ2VC1H680J ECJ2VC1H680J ECA1HM2R2 ECJ2VF1H103Z ECA0JM102 ECJ2VF1H103Z ECJ2VB1C104K ECJ2VB1C104K ECJ2VB1C104K ECJ2VB1C104K ECJ2VB1C104K ECJ2VB1C104K ECJ2VB1C104K ECA1HM0R1 ECJ2VC1H390J ECJ2VC1H390J EEANA1E1R0B EEANA1E1R0B ECJ2VF1H104Z ECJ2VB1H103K ECJ2VB1H103K ECJ2VB1H103K ECJ2VF1H104Z ECA1AM101 ECJ2VF1H103Z ECA1HM2R2 ECA1HM010 TACCW331T50V TACCW331T50V
TAPING GAP TERMINAL TAPING GAP TERMINAL
CAPACITORS
CAP,E 47UF/16V CAP,C .01UF-Z-50V CAP,E 4.7UF/50V CAP,E 47UF/16V CAP,C .01UF-Z-50V CAP,C .01UF-Z-50V CAP,C .01UF-Z-50V CAP,E 100UF/6.3V CAP,C 100PF-J-50V CAP,C 27PF-J-50V CAP,C 27PF-J-50V CAP,E 330UF/6.3V CAP,C .01UF-Z-50V CAP,E 470UF/25V CAP,E 4.7UF/50V CAP,E 1.0UF/50V CAP,E 1.0UF/50V CAP,E 330UF/16V CAP,C 68PF-J-50V CAP,C 68PF-J-50V CAP,E 2.2UF/50V CAP,C .01UF-Z-50V CAP,E 1000UF/6.3V CAP,C .01UF-Z-50V CAP,C .1UF-I-16V CAP,C .1UF-I-16V CAP,C .1UF-I-16V CAP,C .1UF-I-16V CAP,C .1UF-I-16V CAP,C .1UF-I-16V CAP,C .1UF-I-16V CAP,E 0.1UF/50V CAP,C 39PF-J-50V CAP,C 39PF-J-50V CAP,E 1.0UF-25V CAP,E 1.0UF-25V CAP,C .1UF-Z-50V CAP,C .01UF-K-50V CAP,C .01UF-K-50V CAP,C .01UF-K-50V CAP,C .1UF-Z-50V CAP,E 100UF/10V CAP,C .01UF-Z-50V CAP,E 2.2UF/50V CAP,E 1.0UF/50V CAP,C 330PF/50V CAP,C 330PF/50V
ECWH12H822JS CAP,P .0082UF-J-1.2KV ECWH12H272JS CAP,P .0027UF-J-1.2KV ECKD3D122JB ECKD3D181JB CAP,C .0012UF-J-2KV CAP,C 180PF-J-2KV
- 39 -