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SERVICE MANUAL
20" COLOR TELEVISION
6420FE EWF2004
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IMPORTANT SAFETY NOTICE Proper service and repair is important to the safe, reliable operation of all Funai Equipment. The service procedures recommended by Funai and de- scribed in this service manual are effective methods of performing service operations. Some of these service special tools should be used when and as recommended. It is important to note that this service manual contains various CAUTIONS and NOTICES which should be carefully read in order to minimize the risk of personal injury
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SPECIFICATIONS ANT. Input ------------------- 75ohm Unbal., F type Reference Level ----------- 20Vp-p (CRT Green Cathode) Test Input Signal ---------- 400Hz 30% modulation Description Condition Unit Nominal Limit 1. Intermediate Freq. Picture MHz 45.75 - Sound MHz 41.25 - 2. Peak Picture Sens VHF dBµv 15 30 CATV dBµv 15 30 UHF dBµv 15 40 3. AFT Pull In Range (10mV input) - MHz ±2.0 ±0.7 Description Condition Unit Nominal Limit 1. Deflection Freq. Horizontal KHz 15.734 - Vert
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IMPORTANT SAFETY PRECAUTIONS Prior to shipment from the factory, our products are strictly inspected for recognized product safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced. age current tester or a metering system that com- Safety Precautions for TV Circuit plies with American National Standards Institute 1. Before returning an ins
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ing is performed that involves B+, horizontal de- earth ground. If a voltage reading in excess of 1.0V flection or high voltage. Correct operation of the X- is obtained, remove and reinsert the AC power radiation protection circuits also must be recon- plug in the opposite polarity and again measure firmed each time they are serviced. (X-radiation the voltage potential between the chassis and a protection circuits also may be called "horizontal known earth ground. disable" or "hold down.") Read
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3) Align the lengths of the wires to be connected. In- Precautions during Servicing sert the wires fully into the connector. A. Parts identified by the ( # ) symbol are critical for 4) Use the crimping tool to crimp the metal sleeve at safety. the center position. Be sure to crimp fully to the Replace only with part number specified. complete closure of the tool. B. In addition to safety, other parts and assemblies L. When connecting or disconnecting the internal are specified for conforman
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Safety Check after Servicing Examine the area surrounding the repaired location Chassis or Secondary Conductor for damage or deterioration. Observe that screws, parts and wires have been returned to original posi- tions. Afterwards, perform the following tests and con- Primary Circuit Terminals firm the specified values in order to verify compliance with safety standards. d' d 1. Clearance Distance When replacing primary circuit components, confirm specified clearance distance (d) and (d') betwe
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STANDARD NOTES FOR SERVICING Circuit Board Indications How to Remove / Install Flat Pack-IC a. The output pin of the 3 pin Regulator ICs is indicat- 1. Removal ed as shown. With Hot-Air Flat Pack-IC Desoldering Machine: (1) Prepare the hot-air flat pack-IC desoldering ma- Top View Bottom View chine, then apply hot air to the Flat Pack-IC (about Input 5 to 6 seconds). (Fig. S-1-1) Out In b. For other ICs, pin 1 and every fifth pin are indicat- ed as shown. 5 Pin 1 10 Fig. S-1-1 c. The 1st pin
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3. The flat pack-IC on the CBA is affixed with glue, so With Soldering Iron: be careful not to break or damage the foil of each (1) Using desoldering braid, remove the solder from pin or the solder lands under the IC when remov- all pins of the flat pack-IC. When you use solder ing it. flux which is applied to all pins of the flat pack-IC, you can remove it easily. (Fig. S-1-3) Hot-air Desoldering Braid Flat Pack-IC Flat Pack-IC Desoldering Machine CBA Soldering Iron Masking Flat Pack-IC Fig.
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(4) Bottom of the flat pack-IC is fixed with glue to the 2. Installation CBA; when removing entire flat pack-IC, first apply (1) Using desoldering braid, remove the solder from soldering iron to center of the flat pack-IC and heat the foil of each pin of the flat pack-IC on the CBA up. Then remove (glue will be melted). (Fig. S-1-6) so you can install a replacement flat pack-IC more (5) Release the flat pack-IC from the CBA using twee- easily. zers. (Fig. S-1-6) (2) The "I" mark on the flat pack
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Instructions for Handling Semiconductors Electrostatic breakdown of the semiconductors may occur due to a potential difference caused by electro- static charge during unpacking or repair work. 1. Ground for Human Body Be sure to wear a grounding band (1MΩ ) that is prop- erly grounded to remove any static electricity that may be charged on the body. 2. Ground for Workbench Be sure to place a conductive sheet or copper plate with proper grounding (1MΩ ) on the workbench or other surface, where t
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CABINET DISASSEMBLY INSTRUCTIONS Note : 1. Disassembly Flowchart (1) Order of steps in procedure. When reassembling, This flowchart indicates the disassembly steps for the follow the steps in reverse order. These numbers cabinet parts, and the CBA in order to gain access to are also used as the Identification (location) No. of item(s) to be serviced. When reassembling, follow the parts in figures. steps in reverse order. Bend, route and dress the (2) Parts to be removed or installed. cables as t
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(S-1) (S-1) (S-1) [3] Main CBA (S-1) (S-4) (S-2) [1] Rear Cabinet Fig. 1 Fig. 3 [2] CRT CBA (S-1) Anode Cap (S-3) (S-1) (S-2) (S-3) (S-4) (S-3) (S-1) (S-1) (S-1) (S-3) [1] Rear Cabinet [4] CRT Fig. 2 Fig. 4 4-2 L2401DC
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TV Cable Wiring Diagram DG691 DEGAUSSING COIL SP802 SP801 MAIN CBA CLN802 CLN801 CN802 CN801 CN691 WH301A TU11 FLYBACK TUNER TRANSFORMER CN571 T571 WH501A TO CRT GROUND AC601 WH501B AC CORD CN1501 FOCUS JK1501 SCREEN WH301B ANODE Fig. 5 4-3 L2401DC
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ELECTRICAL ADJUSTMENT INSTRUCTIONS General Note: How to set up the service mode: "CBA" is abbreviation for "Circuit Board Assem- Service mode: bly." 1. Use the service remote control unit. NOTE: 2. Turn the power on. (Use main power on the TV Electrical adjustments are required after replacing unit.) circuit components and certain mechanical parts. 3. Press "SLEEP" button on the service remote con- It is important to perform these adjustments only trol unit. Version of micro computer will displ
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CLR 2. Initial Setting 1. Press "MENU" button on the service remote con- General trol unit. Then select "COLOR" (CLR) display. 1. Enter the Service mode. (See page 5-1) 2. Press "CH o/p" buttons on the service remote 2. Press "VOL p" button on the service remote control control unit so that the value of "COLOR" (CLR) unit. Display changes "C/D," "7F," "LANGUAGE," becomes 58. "ACCESS CODE," "SOUND TYPE," "VIDEO TONE," "FM MODE," "V-OUT," "VIDEO," "AV S-CLR MEMO," "STABLE SOUND," "FILTER," "10
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4. H f Adjustment 6. Purity Check 0 1. Enter the Service mode. (See page 5-1) Purpose: To get correct horizontal frequency. 2. Press "7" button on the remote control unit. Each Use service remote control unit. time pressing 7" button on the remote control unit, 1. Press "2" button on the service remote control unit. display changes Red mode, Green mode, Blue and select H-ADJ mode. (By pressing "2" button mode, and White mode cyclically. the display will change from TV AGC to H-ADJ.) 3. Selec
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8. H. Position Adjustment 10. V. Position Adjustment Purpose: To obtain correct horizontal position of Purpose: To obtain correct vertical width of screen image. screen image. Symptom of misadjustment: If V. Position is incor- Symptom of Misadjustment: If H. Position is incor- rect, vertical height of image on the screen may not be rect, horizontal position of image on the screen may properly displayed. not be properly displayed. Test Point Adj. Point Mode Input Test Point Adj. Point Mode Input
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12. Cut-off Adjustment 13. White Balance Adjustment Purpose: To adjust the beam current of R, G, B, and Purpose: To mix red, green and blue beams correctly screen voltage. for pure white. Symptom of Misadjustment: White color may be Symptom of Misadjustment: White becomes bluish reddish, greenish or bluish. or reddish. Test Point Adj. Point Mode Input Test Point Adj. Point Mode Input Screen-Control White Black --- CH o / p RF CH o / p Raster Raster Screen RF buttons buttons (APL Tape M. EQ
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The following adjustments normally are not 14. Sub-Brightness Adjustment attempted in the field. Only when replacing the Purpose: To get proper brightness. CRT then adjust as a preparation. Symptom of Misadjustment: If Sub-Brightness is 16. Purity Adjustment incorrect, proper brightness cannot be obtained by adjusting the Brightness Control. Purpose: To obtain pure color. Symptom of Misadjustment: If Color Purity Adjust- Test Point Adj. Point Mode Input ment is incorrect, large areas of color ma
