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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.
» ELECTRICAL SPECIFICATIONS ......................................................................................................... 1
» IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................ 2
» LOCATION OF USER'S CONTROL ..................................................................................................... 4
» INSTALLATION AND SERVICE INSTRUCTIONS ............................................................................... 5
» CHASSIS LAYOUT ............................................................................................................................ 10
» BLOCK DIAGRAM ..............................................................................................................................11
» DESCRIPTION OF SCHEMATIC DIAGRAMS ................................................................................... 12
» SCHEMATIC DIAGRAMS .................................................................................................................. 13
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 16
» REPLACEMENT PARTS LIST ........................................................................................................... 19
» PACKING OF THE SET ..................................................................................................................... 25
POWER INPUT ....................................... 110-220 V AC 50/60 Hz
POWER RATING .................................................................... 63 W
PICTURE SIZE ............................................. 580cm
CONVERGENCE ............................................................. Magnetic
SWEEP DEFLECTION ..................................................... Magnetic
FOCUS ............................................... Hi-Bi-Potential Electrostatic
INTERMEDIATE FREQUENCIES
Picture IF Carrier Frequency ..................................... 45.75 MHz
Sound IF Carrier Frequency ...................................... 41.25 MHz
Color Sub-Carrier Frequency ..................................... 42.17 MHz
AUDIO POWER
OUTPUT RATING ................................. 1.3W (at 10% distortion)
SERVICE MANUAL
MODEL
CONTENTS
ELECTRICAL SPECIFICATIONS
SPEAKER
2
(89.8sq inch)
ANTENNA INPUT IMPEDANCE
TUNING RANGES
(Nominal)
SHARP CORPORATION
1
COLOR TELEVISION
Chassis No. SN-70A
14LK20A
SIZE .............................................................................. 9 x 5 cm
VOICE COIL IMPEDANCE ............................. 16 ohm at 400 Hz
VHF/UHF .................................................... 75 ohm Unbalanced
VHF-Channels .............................................................. 2 thru 13
UHF-Channels ............................................................ 14 thru 69
CATV Channels .......................................................... 1 thru 125
Specifications are subject to change without
prior notice.
14LK20A
S49F614LK20A/
Page
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Summary of Contents for Sharp 14LK20A
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Page 1: Table Of Contents
14LK20A SERVICE MANUAL S49F614LK20A/ COLOR TELEVISION Chassis No. SN-70A 14LK20A MODEL 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. -
Page 2: Important Service Safety Precaution
14LK20A IMPORTANT SERVICE SAFETY PRECAUTION Ë Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and the servicing guidelines which follow: WARNING X-RADIATION AND HIGH VOLTAGE LIMITS 1. For continued safety, no modification of any circuit 1. - Page 3 14LK20A IMPORTANT SERVICE SAFETY PRECAUTION (Continued) • Connect the resistor connection to all exposed metal BEFORE RETURNING THE RECEIVER parts having a return to the chassis (antenna, metal (Fire & Shock Hazard) cabinet, screw heads, knobs and control shafts, escutcheon and etc.) and measure the AC voltage Before returning the receiver to the user, perform drop across the resistor.
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Page 4: Location Of User's Control
14LK20A LOCATION OF USER'S CONTROL... -
Page 5: Installation And Service Instructions
14LK20A INSTALLATION AND SERVICE INSTRUCTIONS Note: (1) When performing any adjustments to resistor controls and transformers use non-metallic screwdrivers or TV alignment tools. (2) Before performing adjustments, the TV set must be on at least 15 minutes. HIGH VOLTAGE CHECK CIRCUIT PROTECTION The receiver is protected by a 3.15A fuse (F701),... - Page 6 14LK20A For adjustments of this model, the bus data is converted to various analog signals by the D/A converter circuit. Note: There are still a few analog adjustments in this series such as focus and master screen voltage. Follow the steps below whenever the service adjustment is required. See "Table-B" to determine, if serv- ice adjustments are required.
- Page 7 14LK20A DATA SERVICE ADJUSTMENT ITEM ADJUSTMENT CONTENTS NUMBER RANGE INITIAL VALUE PICTURE 00-7F TINT 00-7F COLOR 00-7F BRIGHTNESS 00-7F SHARPNESS 00-3F Must be set to "24" VERTICAL PHASE 00-07 Must be set to between "0" and "03" HORIZONTAL PHASE 00-1F...
- Page 8 14LK20A SERVICE ADJUSTMENT VCO Adjustment White Balance Adjustment 1. Connect a digital voltmeter between pin (44) of IC201 1. Receive a good local channel. and ground. 2. Enter the service mode and select the service 2. Select a good local channel.
- Page 9 14LK20A Sub-Brightness Adjustment 3.58MHz Trap Adjustment 1. Receive a good local channel. 1. Receive a good local channel. 2. Make sure the customer brightness control is set to 2. Enter the service mode and select the service center position. adjustment "S16".
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Page 10: Chassis Layout
14LK20A CHASSIS LAYOUT... -
Page 11: Block Diagram
14LK20A BLOCK DIAGRAM...