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28LF-92H SERVICE MANUAL SE0028LF92H00 Issued: 16th April 2004 AK- 45 CHASSIS MODEL 28LF-92H In the interests of user safety (required by safety regulations in some countries) the set should be restored to its original condition and only parts identical to those specified should be used. In order to service the model 28LF-92H , refer to the AK-45 Chassis Service Manual (SE00AK45CHA00). CONTENTS ELECTRICAL SPECIFICATIONS ... 3 IMPORTANT SERVICING NOTES ... 4 CONTROLS & TERMINALS ... 5 PRINTED WIRING BOARD LAYOUT ... 7 PARTS LISTING ... 8 HOW TO UPDATE THE TECHNICAL INFORMATION ... 15 SHARP CORPORATION 1 This document has been published to be used for after sales service only. 28LF-92H SERVICE MANUAL UPDATE LOG SHEET Technical Report No. Technical Bulletin No. Cause / Solution Part No. Page No. Application Data /Serial No. Use this page to keep any special servicing information as Technical Report (Bulletin), Technical Information, etc. If only part number changes are required, just change part number directly the part number in the Parts Listing Section. If you need more information, please refer to the Technical Report (Bulletin). 2 28LF-92H ELECTRICAL SPECIFICATIONS ·Power Input ... 220V-240 Volts AC 50 Hz ·Power Consumption Normal Operation (Method IEC60107) ... 90 W Stand-by Operation ... < 4 W ·Audio Power Output Rating (MPO) / Impedance Internal Left Speaker ... 10 W, 7 Internal Right Speaker ... 10 W, 7 ·Speakers 2 ways speaker elliptic (2 pcs) ... 50 x 120 mm ·Convergence (Maximum Misconvergence) Position of measuring points on the screen ·Picture Intermediate frequency ... 38.9MHz ·Sound Carrier Trap ... 32.9MHz ·Adjacent Sound Carrier Trap ... 40.9MHz ·Adjacent Picture Carrier Trap ... 30.9MHz ·Aerial Input Impedance VHF/UHF ... 75 ohm Unbalanced ·Tuning Ranges ... 45.75MHz thru 855.25 MHz VHF: IR A - J / CC01-CC68 (Hiperband) UHF: I21 - I69 CH 1 7 2 Distance of measuring points (mm) H ( 2h = H ) ( 2v = V ) c 270 140 10 9 10 V 5 0 6 Admissible misconvergence in X - and Y - direction (mm) 12 11 v V Centre Measuring points 0 1;2;3;4 9 ; 10 ; 11 ; 12 5;6 7;8 misconvergence 0.4 1.8 1.4 1.2 1.2 Corner points 4 8 3 Medium points right, left c h H top, bottom ·White Level Apply the rated voltage at the rated frequenc

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