Sharp CX51TXZ Service Manual
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Sharp CX51TXZ Service Manual

Sharp CX51TXZ Service Manual

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TELETEXT
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.
Ë World Multi 21 Systems
Ë Full Auto Channel Preset and Auto Channel Skip
Ë 100 CH Program Memory
Ë CATV (Hyper Band) Ready
〈Used Frequency Synthesizer Tuner〉
Ë Aperture Control Circuit
Ë Black Stretch Circuit
Ë Arabic/Chinese/English/French/Malay
5 Language OSD
» FEATURE ................................................................... 1
» SPECIFICATIONS ...................................................... 2
» IMPORTANT SERVICE NOTES ................................. 2
» ADJUSTMENT PRECAUTIONS ................................. 3
» TROUBLE SHOOTING TABLE ................................. 21
» CHASSIS LAYOUT ................................................... 24
» WAVEFORMS ........................................................... 25
The chassis in this receiver is partially hot. Use an isolation transformer between the line cord plug and power
receptacle, when servicing this chassis. To prevent electric shock, do not remove cover. No user - serviceable
parts inside. Refer servicing to qualified service personnel.
SERVICE MANUAL
MODEL

FEATURE

Ë On Timer/Sleep Timer/Reminder Timer
Ë Blue Back Noise Mute
Ë White Temp Adjustment
Ë Auto Picture Noise Reduction (TV)
Ë Front AV In & Rear AV In/Out Terminals
Ë NTSC Colour-Comb Filter
Ë Favorite Channel Function
Ë One Page Text (English)
CONTENTS
Page
» SCHEMATIC DIAGRAM ........................................... 28
» BLOCK DIAGRAM .................................................... 32
WARNING
SHARP CORPORATION
1
COLOUR TELEVISION
Chassis No. SP-80
CX51TXZ
ELECTRICAL PARTS ........................................... 41
SUPPLIED ACCESSORIES ................................. 47
CABINET PARTS ................................................. 47
PACKING PARTS ................................................. 47
CX51TXZ
S69J6CX51TXZ/
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Summary of Contents for Sharp CX51TXZ

  • Page 1: Table Of Contents

    CX51TXZ SERVICE MANUAL S69J6CX51TXZ/ TELETEXT COLOUR TELEVISION Chassis No. SP-80 CX51TXZ 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: Specifications

    SPECIFICATIONS Convergence ..............Self Converging System Focus ..............Quadra-Potential Electrostatic IMPORTANT SERVICE NOTES Sweep Deflection ..................Magnetic Intermediate Frequencies Maintenance and repair of this receiver should be done by Picture IF Carrier .................. 38.9 MHz Sound IF Carrier Frequency qualified service personnel only. 6.5 MHz ..................

  • Page 3: Adjustment Precautions

    ADJUSTMENT PRECAUTION SERVICE MODE This model’s setting are adjusted in two different ways: though the I C bus control and in the conventional analog (1) In the Service Mode, Key is used to select the mode in the following order. manner.
  • Page 4 AV TINT PARAMETER (AV TINT) MODE KEY-IN KEY H-CENTER* PICTURE IGR GAIN (IGR) Y-DELAY SECAM (DT SECAM IDK) AV SHARPNESS PARAMETER( AV SHARP) V-CENTER* TEXT V-AMP* INDEX LOWER ERROR (LOW ERR) Y-DELAY SECAM (DT SECAM BG) ANR COLOUR STEP1 (ANR COL1)
  • Page 5 Direct Key-in STEP 2 Mode STEP 2 IN SERVICE MODE (Press LANG Key 2 seconds to switch from STEP 1) MODE KEY-IN KEY SEARCH SPEED REVEAL Fixed DATA, do not change with out specific indication. COLOUR PAL RESET EEPROM item (OSD Display) Data adjustable range Data initial value Remarks...
  • Page 6 INITIAL SETTING SHIPPING SETTING AND CHECKING (1) In service mode, After execute select POS 1, setting the following data in EEPROM. (1) Just before pack the set, input setting, according to factory Initial setting 1~6 in EEPROM as below. MCL1 MCL2 Items Data Setting...
  • Page 7 PIF ADJUSTMENT PURITY ADJUSTMENT No. Adjusting point Adjusting procedure/conditions Waveform and others No. Adjusting point Adjusting procedure/conditions Waveform and others RF-AGC 1. Receive “PAL COLOUR BAR” signal. Note: For the 50 ohm signal Purity 1. Receive the GREEN-ONLY signal. Adjust the »...
  • Page 8 CONVERGENCE ADJUSTMENT CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT No. Adjusting point Adjusting procedure/conditions Waveform and others No. Adjusting point Adjusting procedure/conditions Waveform and others Convergence 1. Receive the “Crosshatch Pattern” signal. CRT cut-off 1. Receive the the “Monoscope Pattern” signal. * Before adjustment , make sure adjustment 2.
  • Page 9 CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT HORIZONTAL AND VERTICAL DEFLECTION LOOP ADJUSTMENT (Continued) No. Adjusting point Adjusting procedure/conditions Waveform and others No. Adjusting point Adjusting procedure/conditions Waveform and others V-AMP 50 1. Adjust V-AMP50 to set overscan of 9.5% typical. ) Mean reception channel (“Monoscope Pattern”...
  • Page 10 PAL CHROMA ADJUSTMENT SECAM CHROMA ADJUSTMENT No. Adjusting point Adjusting procedure/conditions Waveform and others No. Adjusting point Adjusting procedure/conditions Waveform and others Sub-colour 1. Receive the “PAL Colour Bar” signal. SECAM black 1. Receive “SECAM COLOUR BAR” signal. C bus 2.
  • Page 11 PROTECTOR PERFORMANCE CHECK FUNCTION OPERATION CHECKING (VIDEO AND AUDIO) No. Adjusting point Adjusting procedure/conditions Waveform and others No. Adjusting point Adjusting procedure/conditions Waveform and others Beam 1. Receive “Monoscope Pattern” signal. * Short-circuit any of the Q851, CONTRAST 1. Receive “Monoscope Pattern” signal. protector 2.
  • Page 12 FUNCTION OPERATION CHECKING (VIDEO AND AUDIO) FUNCTION OPERATION CHECKING (VIDEO AND AUDIO) (Continued) (Continued) No. Adjusting point Adjusting procedure/conditions Waveform and others No. Adjusting point Adjusting procedure/conditions Waveform and others SHARPNESS 1. Receive “Monoscope Pattern” signal. SOUND 1. Receive “PAL-D/K” signal, press the “SOUND 2.
  • Page 13 PASS WORD “13“ 13OUTSIDE Model NICAM TEXT FAV. CH PASS WORD “85“ 85OUTSIDE CX51TXZ PLL DATA (Higher rank) PLL DATA (Lower rank) PLL DATA (Higher rank) PLL DATA (Lower rank) PLL DATA (Higher rank) PLL DATA (Lower rank) PLL DATA (Higher rank) 1.
  • Page 14 DATA DATA FACTORY FACTORY REMARKS CRITERIA REMARKS CRITERIA ADDRESS SETTING ADDRESS SETTING PLL DATA (Higher rank) CH22 PLL DATA (Higher rank) CH46 PLL DATA (Lower rank) PLL DATA (Lower rank) PLL DATA (Higher rank) CH23 PLL DATA (Higher rank) CH47 PLL DATA (Lower rank) PLL DATA (Lower rank) PLL DATA (Higher rank)
  • Page 15 DATA DATA FACTORY FACTORY REMARKS CRITERIA REMARKS CRITERIA ADDRESS SETTING ADDRESS SETTING PLL DATA (Higher rank) CH70 PLL DATA (Higher rank) CH94 PLL DATA (Lower rank) PLL DATA (Lower rank) PLL DATA (Higher rank) CH71 PLL DATA (Higher rank) CH95 PLL DATA (Lower rank) PLL DATA (Lower rank) PLL DATA (Higher rank)
  • Page 16 DATA DATA FACTORY FACTORY REMARKS CRITERIA REMARKS CRITERIA ADDRESS SETTING ADDRESS SETTING S-SYSTEM C-SYSTEM B:0 I:1 D:2 M:3 / AU:0 PA:1 SE:2 N4:3 N3:4 S-SYSTEM C-SYSTEM CH7 CH6 CH5 CH4 CH3 CH2 CH1 CH0 SKIP S-SYSTEM C-SYSTEM CH15 CH14 CH13 CH12 CH11 CH10 CH9 CH8 0 : OFF S-SYSTEM C-SYSTEM...
  • Page 17 DATA DATA FACTORY FACTORY REMARKS CRITERIA REMARKS CRITERIA ADDRESS SETTING ADDRESS SETTING S-SYSTEM C-SYSTEM CH47 S-SYSTEM C-SYSTEM CH94 S-SYSTEM C-SYSTEM CH48 S-SYSTEM C-SYSTEM CH95 S-SYSTEM C-SYSTEM CH49 S-SYSTEM C-SYSTEM CH96 S-SYSTEM C-SYSTEM CH50 S-SYSTEM C-SYSTEM CH97 S-SYSTEM C-SYSTEM CH51 S-SYSTEM C-SYSTEM CH98 S-SYSTEM...
  • Page 18 DATA DATA FACTORY FACTORY REMARKS CRITERIA REMARKS CRITERIA ADDRESS SETTING ADDRESS SETTING SUB CONTRAST ROM CORRECT 1 ON/OFF P/N GP CL-L SW ROM CORRECT 2 ON/OFF CLL LEVEL PN CD ATT ROM CORRECT1 ADDRESS HIGHER RANK BLACK STRETCH OFFSET DC TRAN RATE APACPN PEAK ABL POINT ABL GAIN...
  • Page 19 DATA DATA FACTORY FACTORY REMARKS CRITERIA REMARKS CRITERIA ADDRESS SETTING ADDRESS SETTING ROM CORRECT2 CODE NICAM CH23 ROM CORRECT2 CODE NICAM CH24 ROM CORRECT2 CODE NICAM CH25 ROM CORRECT2 CODE NICAM CH26 ROM CORRECT2 CODE NICAM CH27 ROM CORRECT2 CODE NICAM CH28 ROM CORRECT2 CODE...
  • Page 20 DATA DATA FACTORY FACTORY REMARKS CRITERIA REMARKS CRITERIA ADDRESS SETTING ADDRESS SETTING NICAM CH69 NICAM CH70 NICAM CH71 NICAM CH72 NICAM CH73 NICAM CH74 NICAM CH75 NICAM CH76 NICAM CH77 NICAM CH78 NICAM CH79 NICAM CH80 NICAM CH81 NICAM CH82 NICAM CH83 NICAM...

  • Page 21: Trouble Shooting Table

    TROUBLE SHOOTING TABLE TROUBLE SHOOTING TABLE (Continued) 5) In the PROTECTOR MODE the next port is forcibly changed. At this time the POWER key is invalid. The test power NO RASTER is kept turned on. POWER-ON is not performed until resetting is made. POWER(Pin 37) : "L"...
  • Page 22 TROUBLE SHOOTING TABLE (Continued) TROUBLE SHOOTING TABLE (Continued) NEITHER VERTICAL NOR NO SPECIFIC COLOUR HORIZONTAL SYNCHRONIZATION Is some colour produced in CIRCUIT TO BE CHECKED: B/W broadcast reception ? » Sync. Separator Circuit. Check IC801 and Q401. Is the white balance properly Check IC801, R809, R810, adjusted ? R811, D801, D802, D803,...

  • Page 23: Solid State Device Base Diagram

    CX51TXZ SOLID STATE DEVICE BASE DIAGRAM TOP VIEW M52797SP TB1226 SAA5254 iX3135 AT24C04 FX0008GE SIDE VIEW CATHODE BASE 1 2 3 3 2 1 E C B ANODE COLLECTOR BASE EMITTER COLLECTOR KiA7045A EMITTER UPC78L05 iX0037CE 2SC3789 2SA1015 RBV-406M TA78L09...

  • Page 24: Chassis Layout

    CX51TXZ CHASSIS LAYOUT...

  • Page 25: Waveforms

    CX51TXZ WAVEFORMS 2.0 Vp-p (H) 0.5 Vp-p (H) 0.7 Vp-p (H) 3.5 Vp-p (H) 3.5 Vp-p (H) 99 Vp-p (H) 100 Vp-p (H) 92 Vp-p (H) 3.5 Vp-p (H) 1.8 Vp-p (H) 4.6 Vp-p (H) 9.3 Vp-p (H) 0.85 Vp-p (H)

  • Page 26: Description Of Schematic Diagram

    CX51TXZ DESCRIPTION OF SCHEMATIC DIAGRAM SAFETY NOTES: NOTES: 1. DISCONNECT THE AC PLUG FROM THE AC OUTLET BEFORE 1. The unit of resistance “ohm” is omitted. REPLACING PARTS. (K = 1000 ohms, M = Meg ohm). 2. All resistors are 1/8 watt, unless otherwise noted.
  • Page 27 CX51TXZ Tuner å å å å å VTUVTBT6ED261 NOTE: The parts here shown are supplied as an assembly but not independently.

  • Page 28: Schematic Diagram

    CX51TXZ SCHEMATIC DIAGRAM: MAIN Unit...
  • Page 29 CX51TXZ...
  • Page 30 CX51TXZ SCHEMATIC DIAGRAM: CRT and FRONT-AV Units CILH0200PE B51QAE320/2E...
  • Page 31 CX51TXZ SCHEMATIC DIAGRAM: TEXT Unit...

  • Page 32: Block Diagram

    CX51TXZ BLOCK DIAGRAM -1/3 Ys/Ym...
  • Page 33 CX51TXZ...
  • Page 34 CX51TXZ BLOCK DIAGRAM -2/3...
  • Page 35 CX51TXZ BLOCK DIAGRAM -3/3...

  • Page 36: Printed Wiring Board Assemblies

    CX51TXZ PRINTED WIRING BOARD ASSEMBLIES PWB-A: MAIN Unit (Wiring Side)
  • Page 37 CX51TXZ...
  • Page 38 CX51TXZ PWB-A: MAIN Unit (Chip Parts Side)
  • Page 39 CX51TXZ...
  • Page 40 CX51TXZ PWB-B: CRT Unit (Wiring Side) PWB-D: TEXT Unit (Wiring Side) PWB-D: TEXT Unit (Chip Parts Side) PWB-E: FRONT-AV Unit (Wiring Side)

  • Page 41: Replacement Parts List Electrical Parts

    CX51TXZ Ref. No. Part No. Description Code Ref. No. Part No. Description Code PARTS LIST PWB-A: DUNTK9665WEW5 PARTS REPLACEMENT MAIN UNIT Replacement parts which have these special safety characteristics identified in this manual: electrical components having such fea- TUNER tures are identified by "å" in the Replacement Parts Lists.
  • Page 42 CX51TXZ Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTK9665WEW5 C304 VCEAGA1CW106M R 10 16V Electrolytic C305 VCEAGA1CW106M R 10 16V Electrolytic MAIN UNIT (Continued) C308 VCKYPA1HF103Z R 0.01 50V Ceramic C309 VCKYPA1HF103Z R 0.01...
  • Page 43 CX51TXZ Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTK9665WEW5 C1020 VCEAGA0JW107M R 100 6.3V Electrolytic C1021 VCCCCY1HH181J R 180p 50V Ceramic MAIN UNIT (Continued) C1022 VCKYCY1HF103Z R 0.01 50V Ceramic C1023 VCKYCY1HF103Z R 0.01...
  • Page 44 CX51TXZ Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTK9665WEW5 R717 VRD-RM2HD124J R 120k 1/2W Carbon R718 VRD-RM2HD124J R 120k 1/2W Carbon MAIN UNIT (Continued) å R719 VRC-UA2HG825K R 8.2M 1/2W Solid å R720 VRC-UA2HG825K R 8.2M 1/2W...
  • Page 45 CX51TXZ Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTK9665WEW5 HM23 LX-GZ3001PEZZ J Screw HM24 LX-GZ3001PEZZ J Screw MAIN UNIT (Continued) HM25 LX-GZ3001PEZZ J Screw HM52 LX-GZ3002PEZZ J Screw R1057 VRS-CY1JF222J R 2.2k 1/16W Metal Oxide AA...
  • Page 46 CX51TXZ Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-B: DUNTK9666WEV4 PWB-D: DUNTK9669WEV2 CRT UNIT TEXT UNIT TRANSISTORS INTEGRATED CIRCUIT Q851 VS2SC3789//1E J 2SC3789 IC1801 VHiSAA5254E-1 R SAA5254P Q852 VS2SC3789//1E J 2SC3789 TRANSISTORS Q853 VS2SC3789//1E J 2SC3789...

  • Page 47: Supplied Accessories

    CX51TXZ Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-E: DUNTK9667WEV2 PACKING PARTS FRONT-AV UNIT (NOT REPLACEMENT ITEM) MISCELLANEOUS PARTS SPAKC6556PEZZ – Packing Case — SPAKP0099PEZZ – Wrapping Paper — J1453 QTANJ0248CEZZ J AV Terminal SPAKX2655PEZZ –...

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