Color Television Audio Lab Of Ga-Books Pdf

Color Television Audio Lab of Ga
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TABLE OF CONTENTS, CHAPTER 1 GENERAL ADJUSTMENTS, SAFETY INSTRUCTIONS 3. CRT ASSEMBLY REPLACEMENT AND MOUNTING 4, PICTURE TUBE COMPONENTS ADJUSTMENT 6. REPLACEMENT OF THE CRT 9, SERVICE MODE 10, ELECTRICAL ADJUSTMENT 12. CONVERGENCE ADJUSTMENT 16, SCREEN AND MIRROR ALIGNMENTS 19. CIRCUIT CHECKS 20, CHAPTER 2 SPECIFIC INFORMATIONS.
SETTING ADJUSTING DATA 21, LOCATION OF CONTROLS 22. ADDING CHANNELS TO THE TV S MEMORY 24, MECHANICAL DISASSEMBLY 25. CHASSIS REPLACEMENT PARTS LIST 27, PC BOARDS BOTTOM VIEW 37. TERMINAL VIEW OF TRANSISTORS 47, CIRCUIT BLOCK DIAGRAM 50. SPECIFICATIONS END, CIRCUIT DIAGRAM, CHAPTER 1 GENERAL ADJUSTMENTS.
SAFETY INSTRUCTIONS, WARNING BEFORE SERVICING THIS CHASSIS READ THE X RAY RADIATION PRECAUTION SAFETY PRECAU. TION AND PRODUCT SAFETY NOTICE INSTRUCTIONS BELOW, X RAY RADIATION PRECAUTION. 1 Excessive high voltage can produce potentially hazardous 2 This receiver is equipped with a Fail Safe FS circuit which. X RAY RADIATION To avoid such hazards the high volt prevents the receiver from producing an excessively high. age must not be above the specified limit The nominal voltage even if the B voltage increases abnormally Each. value of the high voltage of this receiver is A kV at zero time the receiver is serviced the FS circuit must be checked. beam current minimum brightness under a 120V AC to determine that the circuit is properly functioning follow. power source The high voltage must not under any cir ing the FS CIRCUIT CHECK procedure in this manual. cumstances exceed B kV 3 The only source of X RAY RADIATION in this TV receiver. Refer to table 1 for high voltage A B is the picture tube For continued X RAY RADIATION pro. See SETTING ADJUSTING DATA on page 21 tection the replacement tube must be exactly the same. type tube as specified in the parts list, Each time a receiver requires servicing the high voltage 4 Some part in this receiver have special safety related char. should be checked following the HIGH VOLTAGE CHECK acteristics for X RAY RADIATION protection For contin. procedure in this manual It is recommended that the read ued safety parts replacement should be undertaken only. ing of the high voltage be recorded as a part of the service after referring to the PRODUCT SAFETY NOTICE below. record It is important to use an accurate and reliable high. voltage meter, SAFETY PRECAUTION, WARNING Service should not be attempted by anyone unfa Connect a 1500 ohm 10 watt resistor paralleled by a 0 15. miliar with the necessary precautions on this receiver The fol F AC type capacitor between a known good earth ground. lowing are the necessary precautions to be observed before water pipe conduit etc and the exposed metallic parts. servicing this chassis one at a time Measure the AC voltage across the combi. 1 An isolation Transformer should be connected in the power nation of 1500 ohm resistor and 0 15 F capacitor Re. line between the receiver and the AC line before any serv verse the AC plug at the AC outlet and repeat AC voltage. ice is performed on the receiver measurements for each exposed metallic part Voltage. 2 Always discharge the picture tube anode to the CRT con measured must not exceed 0 675 volts rms This corre. ductive coating before handling the picture tube The pic sponds to 0 45 milliamp AC Any value exceeding this limit. ture tube is highly evacuated and if broken glass fragments constitutes a potential shock hazard and must be corrected. will be violently expelled Use shatter proof goggles and immediately. keep picture tube away from the unprotected body while. AC VOLTMETER, 3 When replacing a chassis in the cabinet always be cer.
tain that all the protective devices are put back in place. such as non metallic control knobs insulating covers. shields isolation resistor capacitor network etc, 4 Before returning the set to the customer always perform. an AC leakage current check on the exposed metallic parts. of the cabinet such as antennas terminals screwheads 0 15 F. metal overlays control shafts etc to be sure the set is safe. to operate without danger of electrical shock Plug the AC Place this probe on. Good earth ground each exposed, line cord directly into a 120V AC outlet do not use a line. such as a water metallic part, isolation transformer during this check Use an AC volt. pipe conduit etc 1500 ohm, meter having 5000 ohms per volt or more sensitivity in the. following manner 10 watt, PRODUCT SAFETY NOTICE, Many electrical and mechanical parts in this chassis have special safety related characteristics These characteristics are.
often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained by using. replacement components rated for higher voltage wattage etc Replacement parts which have these special safety charac. teristics are identified in this manual and its supplements electrical components having such features are identified by the. international hazard symbols on the schematic diagram and the parts list. Before replacing any of these components read the parts list in this manual carefully The use of substitute replacement. parts which do not have the same safety characteristics as specified in the parts list may create shock fire X ray radia. tion or other hazards, CRT ASSEMBLY REPLACEMENT AND MOUNTING. CAUTION DO NOT LOOSEN THE HEX HEAD BOLTS WITH SPRINGS 12 PCS BECAUSE THOSE ARE FOR. SEALING OF CRT COOLANT, Attention Serviceman, The Hex Head. Bolts with, Springs see, sketch used on, CRT assembly. Adjustment Screws, DO NOT LOOSEN FLUID, LEAKAGE WILL OCCUR. Lens Assembly, CRT Assembly, S V M Coil, CRT Mounting.
CRT DRIVE Board Deflection Yoke and Conver Yoke, Lens and Neck Components View. TO REMOVE CRT Same procedure for R G B, 1 Remove CRT DRIVE Board S V M COIL and. DEF YOKE from CRT, 2 Remove Lens Assembly, 3 Detach CRT Anode Cap from CRT. 4 Remove CRT Assembly from CRT Mounting Anode Cap, CRT REPLACEMENT Same procedure for R G B. Reverse the removal procedures except the followings. 1 Anode Cable should be replaced with new one, See SERVICING PRECAUTIONS shown below.
2 Install silicon T461B to the CRT replace the Anode. cable and put enough silicon again on around the An. ode Cap as illustrated, CAUTION Align the Anode cable as illustrated on page. On shaded area, TSE3843W 23960136, ADJUSTING PROCEDURE IN REPLACING CRT. 1 R G B FOCUS ADJUSTMENT page 7, 2 PICTURE TILT ADJUSTMENT page 7. 3 USER CONVERGENCE CENTER CHECK, See owner s manual. 4 CENTERING ADJUSTMENT page 7, 5 CONVERGENCE ADJUSTMENT page 13.
6 WHITE BALANCE ADJUSTMENT page 12, Adjustments are complete. SERVICING PRECAUTIONS, Do not use a magnetized screw driver for screws When replacing the anode cap assembly CRT or. of Deflection Yoke and Velocity Modulation Coil to anode lead assembly F B T remove the anode. avoid magnetization of electron gun lead holder from old one and attach the holder. Magnetization of electron gun will degrade basic again to new anode lead. function and result in unbalance of right and left. shift of user static convergence and result in no, variable quantity Check the point of anode lead in a straight. line if it is winding please revise it, D Y Anode lead holder. Screw for SVM coil, WARNING BEFORE SERVICING THIS CHASSIS READ THE X RAY RADIATION PRECAUTION SAFETY PRE.
CAUTION AND PRODUCT SAFETY NOTICE ON PAGE 3 OF THIS MANUAL. PICTURE TUBE COMPONENTS ADJUSTMENT, DESCRIPTION OF NECK COMPONENTS. Deflection yoke and convergence yoke, The position on the neck is required most front. CRT funnel side and the screw is fastened after, rotating yoke adjusting picture tilt. Centering magnet, After adjusting picture tilt picture position is finally. fixed by this magnet, In order to get maximum margin of user conver.
gence control for center of screen this magnet, have to be used for center convergence adjust. PREPARATION, Operate the receiver for at least 5 minutes. R G B FOCUS ADJUSTMENT TILT ADJUSTMENT, 1 Before adjusting the R G B FOCUS remove the 4 screws Rotate R G B deflection yoke so that picture becomes hori. of Lens Assembly which is fixed on the CRT Assembly zon then fasten screw. See page 4, Then turn around the Lens Assembly by 180 to adjust CENTERING ADJUSTMENT. the fastening screw Fig a and fasten the 4 screws to 1 Stretch a thread between two center of screen edge top. secure Lens Assembly and bottom left and right, 2 Select the adjustment mode See page 10.
3 Press 7 button to display the built in cross hatch. 4 Press 0 and RTN buttons to make the picture a single. 100 button to erase Red color, 0 button to erase Green color. RTN button to erase Blue color, 5 Loosen the fasten screw and adjust Red lens focus to best. focusing point of picture center Then fasten the screw. 2 Receive NTSC, Then select SERVICE MODE See Page 10. 3 Select CONVERGENCE ADJUSTING mode and press, 7 button to display the internal net pattern. Move Cursol and recognize horizontal line indicated Y 4. Fig a This line is vertical center Push 9 button to display the. 6 Adjust FOCUS VR R of FOCUS PACK to find best fo vertical stripes and recognaize horizontal center. cusing point of picture center, 7 Repeat steps 3 to 5 for Green and Blue colors.
4 Perform VCEN adjustment See page 12, 5 Adjust G centering magnet so that the cross bar pattern. center comes to screen center, 6 Perform HEIGHT adjustment See page 13. 7 Perform VERT LINEARITY adjustment, 8 Perform WIDTH adjustment See page 12. 9 Check whole quality of green line, 10 Adjust R B centering magnet so that the cross bar pat. tern center comes to screen center, LOCATION OF SCREEN AND FOCUS VR S.
Speaker grille, REPLACEMENT OF THE CRT, Service parts are provided for each R G and B. The contents of the parts are as follows, 46H84 57H84 HOKUTO 2334118 2334119 2334120. 51H84 HITACHI 2334122 2334123 2334124, REPLACEMENT OF HIGH VOLTAGE CABLE. 1 When replacing Anode Lead or Anode Cap with new one. remove Lead Holder from old lead as shown in figure. ANODE LEAD below and put it on new lead Do not throw away Lead. NOTE THE LEAD HOLDER IS ATTACHED TO TPA5007, RUBBER BOOT Z450 BUT IS NOT ATTACHED TO ANODE. LEAD AND ANODE CAP RUBBER BOOT IS AT, TACHED TO ANODE LEAD AND ANODE CAP.
LEAD HOLDER, 2 Detaching Lead Holder, RUBBER BOOT ANODE LEAD. LOCK LEAD HOLDER Cut here rubber boot, and lead together to. Z450 TPA5007 detach Lead Holder, Fig a Fig b, SERVICE MODE. 1 ENTERING TO SERVICE MODE, 1 Press MUTE button twice 2 Press MUTE button 3 While pressing the MUTE button. on Remote Control again to keep pressing press MENU button on TV set. Service mode display, 2 DISPLAYING THE ADJUSTMENT MENU.
1 Press MENU button on TV, Service mode Adjustment mode. Press Data, 3 KEY FUNCTION IN THE SERVICE MODE, The following key entry during display of adjustment menu provides special functions. Screen adjustment mode ON OFF TV ANT VIDEO button on TV. Selection of the adjustment items Channel s t on TV or Remote. Change of the data value Volume s t on TV or Remote. Adjustment menu mode ON OFF MENU button on TV, Initialization of the memory QA02 RECALL Channel button on TV s. Initialization of the self diagnostic data RECALL Channel button on TV t. RCUT selection 1 button, GCUT selection 2 button, BCUT selection 3 button. SCNT selection 4 button, SCOL selection 5 button, TNTC selection 6 button.
Convergence adj 7 button, Self diagnostic display 9 button. 4 SELECTING THE ADJUSTING ITEMS, 1 Every pressing of CHANNEL button in the service mode changes the adjustment items in the order of table 2. button for reverse order, Refer to table 2 for preset data of adjustment mode. See SETTING ADJUSTING DATA on page 21, 5 ADJUSTING THE DATA. 1 Pressing of VOLUME or button will change the value of data in the range from 00H to FFH The variable range. depends on the adjusting item, 6 EXIT FROM SERVICE MODE.
1 Pressing POWER button to turn off the TV once, INITIALIZATION OF MEMORY DATA OF QA02. After replacing QA02 the following initialization is required. 1 Enter the service mode then select any register item. 2 Press and hold the RECALL button on the Remote then press the CHANNEL button on the TV The initialization of QA02. has been complated, 3 Check the picture carefully If necessary adjust any adjustment item above. Perform Programming Channel Memory on the owner s manual. CAUTION Never attempt to initialize the data unless QA02 has been replaced. 7 SELF DIAGNOSTIC FUNCTION, 1 Press 9 button on Remote Control during display of adjustment menu in the service mode. The diagnosis will begin to check if interface among IC s are executed properly. 2 During diagnosis the following displays are shown. SELF CHECK, BUS LINE OK, BUS CONT OK, BLOCK MAIN SUB. EEP VER 02, OPT1 05 OPT2 70, IR BLASTER VER NG, Part number of microprocessor QA01.
Operation number of protection circuit current limiter 000 is normal. BUS line check OK Normal, SCL GND or NG SCL GND short circuit. SDA GND or NG SDA GND short circuit, SCL SDA or NG SCL SDA short circuit. BUS line ACK acknowledge check, Display of Location Number NG. Display example, QA02 NG H001 NG Q501 NG etc, Note The indication of failure place is only one place though failure places are plural When. repair of a failure place finishes the next failure place is indicated The order of priority of. SERVICE MANUAL Color Television 46H84 51H84 57H84 N4PSP Chassis FILE NO 020 200404 Published in Japan May 2004 YC

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