Sharp CX48K4 Service Manual
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Sharp CX48K4 Service Manual

Sharp CX48K4 Service Manual

Chassis no. ua-1
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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.
Ë NTSC (AV thru)
Ë Full Auto Search System
Ë 100 CH Program Memory
Ë CATV (Hyper Band) Ready
Ë AVL (Sound Keeper) Function
Ë High Contrast Picture (Black Stretch Circuit)
Ë ON Timer/Sleep Timer/Reminder Timer
» SPECIFICATIONS ............................................. 2
» IMPORTANT SERVICE NOTES ........................ 2
» ADJUSTMENT PRECAUTIONS ........................ 3
» UA1 HOTEL MODE APPLICATION ................. 15
» TROUBLE SHOOTING TABLE ........................ 16
» CHASSIS LAYOUT .......................................... 19
» BLOCK DIAGRAM ........................................... 20
» WAVEFORMS .................................................. 23
» SCHEMATIC DIAGRAM
Ë REMOTE CONTROL UNIT .......................... 24
Ë TUNER ......................................................... 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 Blue Back Noise Mute
Ë Front AV In and Rear AV In/Out Terminals
Ë Colour-Comb Filter (NTSC AV In)
Ë Hotel Mode
Ë Front Headphone Jack
Ë Multi Language OSD (English/Chinese/French/
CONTENTS
Page
WARNING
SHARP CORPORATION
1
COLOUR TELEVISION
Chassis No. UA-1
CX48K4
Arabic/Malay/Russian)
Ë MAIN UNIT ................................................... 26
Ë CRT UNIT ..................................................... 28
Ë HEADPHONE UNIT ..................................... 28
» REPLACEMENT PARTS LIST
Ë ELECTRICAL PARTS
MAIN UNIT ................................................... 34
CRT UNIT ..................................................... 38
HEADPHONE UNIT ..................................... 38
Ë SUPPLIED ACCESSORIES ........................ 39
Ë PACKING PARTS ......................................... 39
Ë CABINET PARTS ......................................... 39
CX48K4
S30X8CX48K4//
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Summary of Contents for Sharp CX48K4

  • Page 1: Table Of Contents

    CX48K4 SERVICE MANUAL S30X8CX48K4// COLOUR TELEVISION Chassis No. UA-1 CX48K4 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 IMPORTANT SERVICE NOTES Focus ................Electrstatic Focus High Bi-Potential Sweep Deflection ....................Magnetic Maintenance and repair of this receiver should be done by Intermediate Frequencies qualified service personnel only. Picture IF Carrier ....................38.9 MHz Sound IF Carrier Frequency 5.5 MHz ......................

  • Page 3: Adjustment Precautions

    Ë SERVICE MODE ADJUSTMENT PRECAUTIONS (1) In the Service Mode, Key is used to select the mode in the following order. This model’s setting are adjusted in two different ways: though the I C bus control and in the conventional analog manner. The adjustments via the I C bus control include preset-only items and variable data.
  • Page 4 USER DATA IN SERVICE MODE Y-DELAY OFFSET ADJ. ADJ. OPTION MODE MODE MODE * While SERVICE mode ON, EEPROM DATA will switch to the service data. ↓ ↓ ↓ Also, once SERVICE mode OFF, EEPROM will switch back to previous USER DATA. Y-D TIME FOR PAL (TV) (DL-PT) COLOUR OFFSET (PAL) (COL-OP) VERTICAL SCAN DISABLE(VSD)
  • Page 5 After short JA122 & 124, and turn on the main power switch, read data from E PROM EEPROM ITEMS DATA LENGTH INITIAL DATA FIX/ADJ REMARK address 00H ~ 03H, and compare to the list below, if different, initialize the E PROM.
  • Page 6 INITIAL SETTING SHIPPING SETTING & CHECKING (1) In service mode, After execute select POS 1, store the following tuning data in E PROM. (1) The following default data has been factory-set for the E PROM. MCL1 MCL2 ITEMS DATA SETTING CH-No.
  • Page 7 PIF ADJUSTMENT PURITY ADJUSTMENT NO. Adjustment part Adjusting procedure and conditions Waveform and others NO. Adjustment part Adjusting procedure and conditions Waveform and others Tuner IFT 1. Get the tuner ready to receive the E-9 CH PURITY ADJ. 1. Receive the GREEN-ONLY signal. Adjust the (PRESET) signal, but with no signal input.
  • Page 8 CONVERGENCE ADJUSTMENT CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT NO. Adjustment part Adjusting procedure and conditions Waveform and others NO. Adjustment part Adjusting procedure and conditions Waveform and others CONVERGENCE 1. Receive the "Crosshatch Pattern" signal. CRT CUTOFF 1. Switch TV to VIDEO mode, BLUE BACK OFF 3.0Vdc ADJ.
  • Page 9 HORIZONTAL AND VERTICAL DEFLECTION LOOP ADJUSTMENT NTSC CHROMA ADJUSTMENT NO. Adjustment part Adjusting procedure and conditions Waveform and others NO. Adjustment part Adjusting procedure and conditions Waveform and others V-LINEARITY 1. Receive Monoscope Pattern Signal. SUB-TINT 1. Receive the "NTSC3.58 Colour Bar" signal C BUS 2.
  • Page 10 FUNCTION OPERATION CHECKING (VIDEO AND AUDIO) FUNCTION OPERATION CHECKING (VIDEO AND AUDIO) (Continued) NO. Adjustment part Adjusting procedure and conditions Waveform and others CONTRAST 1. Receive "Monoscope Pattern" signal. NO. Adjustment part Adjusting procedure and conditions Waveform and others 2. Set P-Mode to select CONTRAST. Colour 1.
  • Page 11 HEADPHONE JACK CHECKING MEMORY MAP NO. Adjustment part Adjusting procedure and conditions Waveform and others DATA ADDRESS MICO EEPROM EEPROM CHASSIS CTV FINAL LAST INITIAL HEADPHONE 1. Receive PAL COLOUR PAR with SOUND (HEX) DEFAULT RANGE WRITE(CPU) CHECK DATA CHECK TYPE CHECK DATA CHECK TYPE SETTING DATA REMARK OUTPUT 400Hz, 100% MODULATION (±50kHz Dev).
  • Page 12 DATA DATA MICO EEPROM EEPROM CHASSIS CTV FINAL LAST INITIAL ADDRESS MICO EEPROM EEPROM CHASSIS CTV FINAL LAST INITIAL ADDRESS (HEX) (HEX) DEFAULT RANGE WRITE(CPU) CHECK DATA CHECK TYPE CHECK DATA CHECK TYPE SETTING DATA REMARK DEFAULT RANGE WRITE(CPU) CHECK DATA CHECK TYPE CHECK DATA CHECK TYPE SETTING DATA REMARK...
  • Page 13 DATA DATA ADDRESS MICO EEPROM EEPROM CHASSIS CTV FINAL LAST INITIAL ADDRESS MICO EEPROM EEPROM CHASSIS CTV FINAL LAST INITIAL (HEX) (HEX) DEFAULT RANGE WRITE(CPU) CHECK DATA CHECK TYPE CHECK DATA CHECK TYPE SETTING DATA REMARK DEFAULT RANGE WRITE(CPU) CHECK DATA CHECK TYPE CHECK DATA CHECK TYPE SETTING DATA REMARK TUNING FREQUANCY (LOWER PART) POS 25...
  • Page 14 DATA DATA ADDRESS MICO EEPROM EEPROM CHASSIS CTV FINAL LAST INITIAL ADDRESS MICO EEPROM EEPROM CHASSIS CTV FINAL LAST INITIAL (HEX) (HEX) DEFAULT RANGE WRITE(CPU) CHECK DATA CHECK TYPE CHECK DATA CHECK TYPE SETTING DATA REMARK DEFAULT RANGE WRITE(CPU) CHECK DATA CHECK TYPE CHECK DATA CHECK TYPE SETTING DATA REMARK TUNING FREQUANCY (HIGHER PART) POS 68...

  • Page 15: Ua1 Hotel Mode Application

    DATA UA1 HOTEL MODE APPLICATION ADDRESS MICO EEPROM EEPROM CHASSIS CTV FINAL LAST INITIAL (HEX) DEFAULT RANGE WRITE(CPU) CHECK DATA CHECK TYPE CHECK DATA CHECK TYPE SETTING DATA REMARK How to enable/disable the "Hotel Mode" ? Ans: a) Press the R/C (FUNCTION) key until language selection appear, within five second press the (one/two digit) key and keep pressing it for five second, then you can see the hotel mode with four digits password.

  • Page 16: Trouble Shooting Table

    TROUBLE SHOOTING TABLE TROUBLE SHOOTING TABLE (Continued) CIRCUITS TO BE CHECKED: NO RASTER NO PICTURE, NO SOUND » Tuner. » PIF. » Automatic Gain Control. » (5V), (32V) Power Source. Check F701. Blown out. Does the noise level increase at max. Contrast, Brightness and Sound controls ? Normal Replace the fuse.
  • Page 17 TROUBLE SHOOTING TABLE TROUBLE SHOOTING TABLE (Continued) (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 pins (16), (17) and (34) of IC801. Check IC801, R801, R802, Is the white balance properly R803, D804, D805, D806...

  • Page 18: Solid State Device Base Diagram

    CX48K4 SOLID STATE DEVICE BASE DIAGRAM TOP VIEW COLLECTOR COLLECTOR :BR: BASE EMITTER BASE EMITTER M24C04W B709A FX0008GE D601A COLLECTOR BASE EMITTER 2SC2735 IX3368CE SIDE VIEW BASE 1 2 3 COLLECTOR BASE EMITTER COLLECTOR SE115N EMITTER 2SA1015 PST573J DX0386CE 2SC1815...

  • Page 19: Chassis Layout

    CX48K4 CHASSIS LAYOUT...

  • Page 20: Block Diagram

    CX48K4 BLOCK DIAGRAM...
  • Page 21 CX48K4...

  • Page 22: Waveforms

    CX48K4 WAVEFORMS 0.98 Vp-p 3.15 Vp-p (H) 3.02 Vp-p (H) 3.28Vp-p (H) 81.8 Vp-p (H) 80.0 Vp-p (H) 89.4 Vp-p (H) 3.10 Vp-p (H) 1.85 Vp-p (H) 129.0 Vp-p (H) 8.38 Vp-p (H) 1.08 Vp-p (H) 0.83 Vp-p (H) 46.6 Vp-p (H) 130.0 Vp-p (H)

  • Page 23: Description Of Schematic Diagram

    CX48K4 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 1/16 watt, unless otherwise noted.

  • Page 24: Ë Tuner

    CX48K4 Ë Tuner å VTUATEDE9-023 NOTE : The parts here shown are supplied as an assembly but not independently.
  • Page 25 CX48K4 SCHEMATIC DIAGRAM: MAIN Unit...
  • Page 26 CX48K4 SCHEMATIC DIAGRAM: CRT and HEADPHONE Unit...

  • Page 27: Printed Wiring Board Assemblies

    CX48K4 PRINTED WIRING BOARD ASSEMBLIES PWB-B: CRT Unit (Wiring Side) (Component Side) (Chip Parts Side) PWB-C: HEADPHONE Unit...
  • Page 28 CX48K4 PWB-A: MAIN Unit (Component Side)
  • Page 29 CX48K4 PWB-A: MAIN Unit (Chip Parts Side)

  • Page 30: Main Unit

    CX48K4 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PARTS LIST TRANSISTORS Q201 VS2SC2735//1E R 2SC2735 Q203 VS2SD601A//-1 R 2SD601A PARTS REPLACEMENT Q205 VS2SC1815GW-1 R 2SC1815GW Replacement parts which have these special safety characteristics Q301 VS2SD601A//-1...
  • Page 31 CX48K4 Ref. No. Part No. Description Code Ref. No. Part No. Description Code D756 RH-DX0471CEZZ R Diode C317 VCEA0A1HW224M R 0.22 Electrolytic D757 RH-DX0471CEZZ R Diode C318 VCKYCY1HB102K R 1000p 50V Ceramic D758 RH-DX0461CEZZ R Diode C331 VCEA0A1HW105M R 1.0...
  • Page 32 CX48K4 Ref. No. Part No. Description Code Ref. No. Part No. Description Code C714 RC-KZ0338CEZZ R 560p Ceramic RJ66 VRN-MD2AL000J 1/10W Metal Film C715 VCKYPA2HB102K R 1000p 500V Ceramic RJ68 VRN-MD2AL000J 1/10W Metal Film C717 VCQYTA1HM182J R 1800p 50V Mylar...
  • Page 33 CX48K4 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R406 VRN-MD2AL103J R 10k 1/10W Metal Film R757 VRD-RA2BE182J R 1.8k 1/8W Carbon R407 VRN-MD2AL101J R 100 1/10W Metal Film R758 VRD-RA2BE102J R 1.0k 1/8W Carbon R411...

  • Page 34: Crt Unit

    CX48K4 Ref. No. Part No. Description Code Ref. No. Part No. Description Code FB751 RBLN-0037CEZZ R Ferrite Bead R885 VRD-RM2HD272J R 2.7k 1/2W Carbon FB752 RBLN-0037CEZZ R Ferrite Bead R886 VRS-VV3DB153J R 15k 2W Metal Oxide FH701 QFSHD1014CEZZ R Fuse Holder...
  • Page 35 Not Available – Front Cabinet — SP302 VSP9050PB25WA R Speaker, 16 ohm GCOVA0115PESA J Cover, LED, R/C Receiver LHLDF0044PEZZ J Holder HBDGB0015PESA J Badge, “SHARP” LHLDW1033PEZZ J Holder JBTN-0319PESA J Button, Control LHLDW1033PEZZ J Holder JBTN-0318PESA J Button, Power LHLDW1060PEZZ...
  • Page 36 Code Ref. No. Part No. Description Code COPYRIGHT © 2000 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.

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