Service manual

ManualsBrandsSharp ManualsTVs & monitors27SC26BQ

This document has been published to be used for after

sales service only.

The contents are subject to change without notice.

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.

COLOR TELEVISION

Chassis No. GB-D7

Page

» ELECTRICAL SPECIFICATIONS ......................................................................................................... 1

» IMPORTANT SERVICE SAFETY PRECAUTION .................................................................................2

» LOCATION OF USER'S CONTROL .....................................................................................................5

» INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................6

» SERVICE ADJUSTMENT ...................................................................................................................13

» CHASSIS LAYOUT .............................................................................................................................16

» BLOCK DIAGRAM ..............................................................................................................................17

» DESCRIPTION OF SCHEMATIC DIAGRAMS & WAVEFORMS ........................................................18

» SCHEMATIC DIAGRAMS ...................................................................................................................19

» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................26

» PARTS LIST ........................................................................................................................................ 31

» PACKING OF THE SET ......................................................................................................................40

SPEAKER

SIZE .......................................................... 12 x 6 cm oval (2 pcs.)

VOICE COIL IMPEDANCE ............................. 16 ohm at 400 Hz

ANTENNA INPUT IMPEDANCE

VHF/UHF ..................................................... 75 ohm Unbalanced

TUNING RANGES

VHF-Channels ............................................................... 2 thru 13

UHF-Channels ............................................................14 thru 69

CATV Channels ............................................ 1 thru 125 (Analog)

CATV Channels ............................................. 1 thru 135 (Digital)

Digital Terrestrial Broadcast (VHF/UHF) .......................2 thru 69

(EIA, Channel Plan U.S.A.)

POWER INPUT ..................................................... 120V AC, 60 Hz

POWER RATING .................................................................. 110W

PICTURE SIZE ....................................... 2,193.5 cm

(339sq inch)

CONVERGENCE ............................................................. Magnetic

SWEEP DEFLECTION .................................................... Magnetic

FOCUS ............................................... Hi-Bi-Potential Electrostatic

INTERMEDIATE FREQUENCIES

Picture IF Carrier Frequency ...... 45.75 MHz (Analog Terrestrial)

Sound IF Carrier Frequency ....... 41.25 MHz (Analog Terrestrial)

Color Sub-Carrier Frequency ..... 42.17 MHz (Analog Terrestrial)

IF Center Frequency ........................ 44 MHz (Digital Terrestrial)

(Nominal)

AUDIO POWER

OUTPUT RATING .............. 3.0W + 3.0W (at 10% distortion and

Dual CH Operate)

Specifications are subject to change without

prior notice.

ELECTRICAL SPECIFICATIONS

MODEL

SERVICE MANUAL

27SC26BQ

CONTENTS

27SC26BQ

Summary of content (42 pages)

PAGE 1
27SC26BQ SERVICE MANUAL COLOR TELEVISION Chassis No. GB-D7 MODEL 27SC26BQ 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. CONTENTS Page » ELECTRICAL SPECIFICATIONS ......................................................................................................... 1 » IMPORTANT SERVICE SAFETY PRECAUTION ...............................................
PAGE 2
7SC26BQ 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 should be attempted. 2. Disconnect AC power before servicing. 3. Semiconductor heat sinks are potential shock hazards when the chassis is operating. 4.
PAGE 3
27SC26BQ IMPORTANT SERVICE SAFETY PRECAUTION (Continued) • Connect the resistor connection to all exposed metal parts having a return to the chassis (antenna, metal cabinet, screw heads, knobs and control shafts, escutcheon, etc.) and measure the AC voltage drop across the resistor. AII checks must be repeated with the AC line cord plug connection reversed. (If necessary, a nonpolarized adapter plug must be used only for the purpose of completing these check.) Any current measured must not exceed 0.
PAGE 4
27SC26BQ Precautions for using lead-free solder 1 Employing lead-free solder "PWBs" of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on the PWBs and service manuals. The alphabetical character following LF shows the type of lead-free solder. Example: LFa Indicates lead-free solder of tin, silver and copper. 2 Using lead-free wire solder When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder.
PAGE 5
27SC26BQ LOCATION OF USER'S CONTROL Front Panel POWER Press → On. Press again → Off. VIDEO/AUDIO IN 2 TERMINALS REMOTE CONTROL SENSOR MENU Press → Accesses MAIN MENU. Press again → Exits MAIN MENU. VOLUME UP/DOWN (k) Increases sound. (l) Decreases sound. CHANNEL UP/DOWN (a) Selects next higher channel. (s) Selects next lower channel. Basic Remote Control Functions Infrared Transmitter Window POWER Press → On. Press again → Off. INPUT Press → Switches to external video INPUT 1 mode.
PAGE 6
27SC26BQ 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. CIRCUIT PROTECTION HIGH VOLTAGE CHECK The receiver is protected by a 4.0A fuse (F701), mounted on PWB-A, wired into one side of the AC line input.
PAGE 7
27SC26BQ 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 service adjustments are required. 1. Service mode 4.
PAGE 8
27SC26BQ 4:3-Def-Adj A. Deflection no. Item.
PAGE 9
27SC26BQ no. Item. DATA D40 AS-SAV FIX D41 AS-YUV FIX D42 AS-DTV FIX D43 FBP-TV FIX D44 AS-SPEED-UP FIX D45 AS-SPEED-DN FIX no. Item.
PAGE 10
F-AV F-AV S-VIDEO S-VIDEO COLOR TEMP COLOR TEMP TV TV DTV DTV Componenet Componenet 27SC26BQ no. Item.
PAGE 11
RR-AV RR-AV 27SC26BQ no. Item.
PAGE 12
27SC26BQ no. Item. DATA V105 R-MTX-DN FIX V106 CTI FIX V107 KILLER-LVL FIX V108 SIF-BW FIX V109 E-SAVE FIX V110 MONITORING FIX V111 OFF-ADJ-TINT-YUV FIX V112 OFF-ADJ-TINT-DTV FIX V113 V114 V115 V116 V117 CC-POS CC LEVEL OSD POS DIGITAL POW OFF TIM BSW CONTROL ADJ FIX FIX FIX FIX V118 SVM-SAV FIX V119 SVM-COMP FIX V120 SVM-DTV FIX V121 RGB ADJ FIX V122 ChromaBPF FIX no. Item.
PAGE 13
27SC26BQ Holding down both the VOL-up and CH-up buttons on the TV set at service mode for more than 2 seconds will automatically write the above initial values into IC2101. PART REPLACED ADJUSTMENT NECESSARY UNNECESSARY NOTES IC801 X The adjustment is needed to compensate for characteristics of parts including IC801 and MTS level (M01).
PAGE 14
27SC26BQ White Balance Adjustment Sub-Tint Adjustment 1. Receive a good local channel. 2. Enter the service mode and select the service adjustment "V03" and set to "00" (minimum color) (Record original data code under adjustment "V03" before changing). "V03" does not have to be adjusted, if you selected a B/W picture or monoscope pattern. 3. Alternately adjust the service adjustment data of "V09" and "V10" until a good grey scale with normal whites is obtained. (RF Input) 4.
PAGE 15
27SC26BQ Vertical-Size and Linearity Adjustments EW-Corner 1. Receive a good local channel. (SCREEN FORMAT 4:3) 2. Enter the service mode and select the service adjustment "D04" for V-size. 3. Adjust the "D04" bus data to get the proper V-size. 4. For V-linearity adjustment, select data bus "D07" and adjust to get the proper vertical linearity. (SCREEN FORMAT 16:9) 5. Input data of "D14" to minus 26 steps from "D04" data. (V-SIZE) 6. Input data of "D17" to minus 3 steps from "D07" data.
PAGE 16
27SC26BQ CHASSIS LAYOUT 16
PAGE 17
27SC26BQ BLOCK DIAGRAM 17
PAGE 18
27SC26BQ DESCRIPTION OF SCHEMATIC DIAGRAMS WAVEFORM MEASUREMENT CONDITIONS: 1. Photographs taken on a standard gated color bar signal, the tint setting adjusted for proper color. The wave shapes at the red, green and blue cathodes of the picture tube depend on the tint, color level and picture control. 2. indicates waveform check points (See chart, waveforms are measured from point indicated to chassis ground.) NOTES: 1. The unit of resistance "ohm" is omitted. (K=kW=1000W, M=MW) 2.
PAGE 19
27SC26BQ SCHEMATIC DIAGRAM: CRT Unit H G F E D C B A 1 2 3 4 5 6 19 7 8 9 10
PAGE 20
27SC26BQ SCHEMATIC DIAGRAM: MAIN-1 Unit H DUNTKD872WEA1 G F E D C B A 1 2 3 4 5 20 6 7 8 9 10
PAGE 21
27SC26BQ 10 11 12 13 14 15 21 16 17 18 19
PAGE 22
27SC26BQ SCHEMATIC DIAGRAM: MAIN-2 Unit H G F E D C B A 1 2 3 4 5 22 6 7 8 9 10
PAGE 23
27SC26BQ 10 11 12 13 14 15 23 16 17 18 19
PAGE 24
27SC26BQ SCHEMATIC DIAGRAM: 2-LINE Y/C Unit H G F E D C B A 1 2 3 4 5 24 6 7 8 9 10
PAGE 25
27SC26BQ 10 11 12 13 14 15 25 16 17 18 19
PAGE 26
27SC26BQ PRINTED WIRING BOARD ASSEMBLIES PWB-A: MAIN Unit (Wiring Components Side) H G F E D C B A 1 2 3 4 5 26 6 7 8 9 10
PAGE 27
SC26BQ 10 11 12 13 14 15 27 16 17 18 19
PAGE 28
27SC26BQ PWB-A: MAIN Unit (Components side) H G F E D C B A 1 2 3 4 5 28 6 7 8 9 10
PAGE 29
27SC26BQ 10 11 12 13 14 15 29 16 17 18 19
PAGE 30
27SC26BQ H G F E D PWB-B: CRT Unit (Wiring Side) C B A PWB-D: 2-LINE Y/C Unit (Wiring Side) 1 2 3 4 PWB-D: 2-LINE Y/C Unit (Chip Parts Side) 5 6 30 7 8 9 10
PAGE 31
27SC26BQ Ref. No. Part No. PARTS LIST TUNER NOTE:THE PARTS HERE SHOWN ARE SUPPLIED AS AN ASSEMBLY BUT NOT INDEPENDETLY U U "HOW TO ORDER REPLACEMENT PARTS" U U To have your order filled promptly and correctly, please furnish the following informations. 2. REF. NO. 4. DESCRIPTION in USA: Contact your nearest SHARP Parts Distributor to order. For location of SHARP Parts Distributor, Please call TollFree; 1-800-BE-SHARP « MARK: SPARE PARTS-DELIVERY SECTION p MARK: X-RAY RELATED PARTS Ref. No.
PAGE 32
27SC26BQ Ref. No. Part No. Description Code Ref. No. Part No.
PAGE 33
27SC26BQ Ref. No. Part No. Description Code PWB-A: DUNTKD872WEA1 MAIN UNIT CAPACITORS [EL.··· Electrolytic, M-Poly.
PAGE 34
27SC26BQ Ref. No. Part No. Description Code PWB-A: DUNTKD872WEA1 MAIN UNIT CAPACITORS [EL.··· Electrolytic, M-Poly.
PAGE 35
27SC26BQ Ref. No. Part No. Description Code Ref. No. Part No.
PAGE 36
27SC26BQ Ref. No. Part No. Description Code Ref. No. Part No.
PAGE 37
27SC26BQ Ref. No. Part No. Description Ref. No. Code PWB-A: DUNTKD872WEA1 1/16W 1/16W 1/16W 1/16W 2W 1/16W 1/16W 1/16W 1/8W 1/16W 1/16W 1/16W 1/8W 1/8W 1/16W 1/8W 1/8W 1/8W 1/8W 1/16W 1/16W M-Ox. M-Ox. M-Ox. M-Ox. M-Ox. M-Ox. M-Ox. M-Ox. Carbon M-Ox. M-Ox. M-Ox. Carbon Carbon M-Ox. Carbon Carbon Carbon Carbon M-Ox. M-Ox.
PAGE 38
27SC26BQ Ref. No. Part No. Description Code Ref. No. Part No. CRT UNIT C1431 C1432 RESISTORS [M-Ox.··· Metal Oxide, M-Film ··· Metal Film] VRC-MA2HG332KY VRC-MA2HG332KY VRC-MA2HG332KY VRD-RA2BE221JY VRD-RA2BE221JY VRD-RA2BE221JY VRD-RA2BE471JY VRD-RA2BE471JY VRD-RA2BE471JY VRD-RA2BE562JY VRD-RA2BE102GY VRD-RA2BE331GY VRD-RA2BE152JY VRD-RA2EE561JY VRD-RA2BE222JY P860 P880 SC850 QPLGN0441CEZZ QPLGN0641CEZZ QSOCV0937CEZZ X X X X X X X X X X X X X X X 3.3k 3.3k 3.3k 220 220 220 470 470 470 5.6k 1.
PAGE 39
27SC26BQ Ref. No. Part No. Description Ref. No. Part No.
PAGE 40
27SC26BQ PACKING OF THE SET FRONT Use tape to fix the top side of packing case. REAR Use 12 staples to fix the bottom side of packing case.
PAGE 41
27SC26BQ -MEMO- 41
PAGE 42
27SC26BQ COPYRIGHT © 2007 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. QRC0033-U June. 2007 Modify : SEMEX Design and Production Information Design base : SEM Production : SEMEX JB SHARP ELECTRONICA MEXICO S. A. DE C. V. Quality & Reliability Control Center Blvd. SHARP No.