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Sharp 29MU70 Service Manual
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Sharp 29MU70 Service Manual

Sharp 29MU70 Service Manual

Chassis c/d-bm
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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 ............................................................................................................................. 11
» BLOCK DIAGRAM .............................................................................................................................. 12
» SCHEMATIC DIAGRAMS ................................................................................................................... 13
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 19
» REPLACEMENT PARTS LIST ............................................................................................................ 22
» PACKING OF THE SET ...................................................................................................................... 29
POWER INPUT .................................................... 120 V AC 60 Hz
POWER RATING .................................................................. 105 W
PICTURE SIZE ........................................... 2,187cm
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 ..................... 1.5W + 1.5W (at 10% distortion
SHARP CORPORATION
SERVICE MANUAL
MODEL
CONTENTS
ELECTRICAL SPECIFICATIONS
SPEAKER
2
(339sq inch)
ANTENNA INPUT IMPEDANCE
TUNING RANGES
(Nominal)
and Dual CH Operate)
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
1
COLOR TELEVISION
Chassis No. C/D-BM
29MU70
SIZE ...................................................................9x5 cm (Oval)
VOICE COIL IMPEDANCE ............................. 32 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.
29MU70
S12F529MU70/
Page
(EIA, Channel Plan U.S.A.)

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Summary of Contents for Sharp 29MU70

  • Page 1: Table Of Contents

    29MU70 SERVICE MANUAL S12F529MU70/ COLOR TELEVISION Chassis No. C/D-BM 29MU70 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

    29MU70 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 29MU70 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.

  • Page 4: Location Of User's Control

    29MU70 LOCATION OF USER'S CONTROL Front Panel VIDEO IN 2 L-AUDIO-R POWER Press → On. (VIDEO/AUDIO terminals are also Press again → Off. provided on the rear.) CHANNEL UP/DOWN – MENU ) Selects next higher channel. ) Selects next lower channel.

  • Page 5: Installation And Service Instructions

    29MU70 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 4.0A fuse (F701),...
  • Page 6 29MU70 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 adjusment is required.
  • Page 7 29MU70 Below are the adjustments ranges and initial values for FIX VALUE category. FIX VALUE DATA SERVICE ADJUST ITEM INITIAL VALUE (Hex) POSITION RANGE OPTION 1 00-FF OPTION 2 00-FF E-SAVE 00-3F TUNER SETUP 00, 01 R-TONE RD 00-7F R-TONE BD...
  • Page 8 29MU70 SIGNAL DATA SERVICE ADJUST ITEM ADJUSTMENT CONTENTS POSITION RANGE INITIAL VALUE RF AGC 00-3F VIDEO LEVEL 00-07 Must be "4" "01": Y-MUTE, "02": V-STOP & Y-MUTE Y-MUTE 00-03 "03": Activate color killer circuit. SUB BIAS 00-FF Must be "30"...
  • Page 9 29MU70 Ë SERVICE ADJUSTMENT 4. Select the service adjustment "S03" and set the data Note: Before making the service adjustment, make the bus data settings. value to "01" to turn off the luminance signal (Y-mute). +B Adjustment 5. Select the service adjustment "S14" and adjust the data value to obtain 2.35 volts as shown in Figure B.
  • Page 10 29MU70 Ë MTS ADJUSTMENT Vertical-Size, V-Linearity and V-S Correction Adjustments MTS Level Adjustment 1. Receive a good local channel. 1. Feed the following monaural signal to pin (14) of 2. Enter the service mode DEF category and select the IC3001.

  • Page 11: Chassis Layout

    29MU70 CHASSIS LAYOUT...

  • Page 12: Block Diagram

    29MU70 BLOCK DIAGRAM...
  • Page 13 29MU70 DESCRIPTION OF SCHEMATIC DIAGRAM WAVEFORM MEASUREMENT CONDITIONS: NOTES: 1. Photographs taken on a standard gated color bar 1. The unit of resistance "ohm" is omitted. (K=k Ω =1000 Ω , M=M Ω ) signal, the tint setting adjusted for proper color. The wave shapes at the red, green and blue cathodes of 2.
  • Page 14 29MU70 SCHEMATIC DIAGRAM: MAIN-1 Unit DUNTKA462WEW7...
  • Page 15 29MU70 SCHEMATIC DIAGRAM: MAIN-2 Unit (DUNTKA462WEW7)
  • Page 16 29MU70 SCHEMATIC DIAGRAM: CRT Unit...

  • Page 17: Printed Wiring Board Assemblies

    29MU70 PRINTED WIRING BOARD ASSEMBLIES PWB-B: CRT Unit (Wiring Side)
  • Page 18 29MU70 PWB-A: MAIN Unit (Wiring Side)
  • Page 19 29MU70 PWB-A: MAIN Unit (Chip Parts Side)
  • Page 20 3. PART NO. 4. DESCRIPTION å IC702 RH-FX0034CEZZ J PC817 RH-FX0002GEZZ in USA: Contact your nearest SHARP Parts Distributor to order. For location of SHARP Parts Distributor, Please call Toll- RH-FX0029CEZZ Free; 1-800-BE-SHARP IC703 VHiSE125N//-1 X SE125N å IC751 VHiKA7809AP-1 J KA7809API å...
  • Page 21 29MU70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA462WEW7 å D704 RH-DX0154CEZZ J Diode MAIN UNIT (Continued) RH-DX0490CEZZ RH-DX0279CEZZ VSSTP6NC60+-1 D707 VHD1SS119//-1 J Diode VSSTP6NC60FP VHD1SS244//-1 D708 VHD1SS119//-1 J Diode VSSTP7NB60FP Q704 VS2SD601AR/-1 J 2SD601AR...
  • Page 22 29MU70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA462WEW7 RC-FZ017SGEZZ MAIN UNIT (Continued) RC-FZ029SGEZZ T602 RTRNF0049MEZZ X H-Volt Transformer ' å C702 RC-KZ0029CEZZ J 0.01 AC250V Ceramic RTRNFA004WJZZ RC-KZ0016CEZZ T702 RTRNW0001GJZZ X Transformer å...
  • Page 23 29MU70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA462WEW7 R302 VRS-CY1JF152J J 1.5k 1/16W M-Ox. R304 VRS-CY1JF102J J 1.0k 1/16W M-Ox. MAIN UNIT (Continued) R305 VRS-CY1JF152J J 1.5k 1/16W M-Ox. R306 VRS-CY1JF333J J 33k 1/16W M-Ox.
  • Page 24 29MU70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA462WEW7 R2024 VRD-RA2BE682J J 6.8k 1/8W Carbon R2025 VRD-RA2BE682J J 6.8k 1/8W Carbon MAIN UNIT (Continued) R2026 VRD-RA2BE682J J 6.8k 1/8W Carbon R2027 VRD-RA2BE682J J 6.8k 1/8W...
  • Page 25 29MU70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA462WEW7 PWB-B: DUNTK9510WEW3 MAIN UNIT (Continued) CRT UNIT TRANSISTORS R3507 VRS-CY1JF102J J 1.0k 1/16W M-Ox. R3508 VRS-CY1JF102J J 1.0k 1/16W M-Ox. Q851 VS2SC3198-Y-1 J 2SC3198(Y) Q852...
  • Page 26 å GCABA0177WEH1 Front Cabinet — QACCD3090CESA GCOVA0121GJKA X Cover for R/C LHLDK0014PEZZ R AC Cord Holder HBDGB1009MESB X Badge, "SHARP" LHLDW1014PEZZ R Holder, x2 JBTN-0138GJKC X Button, Power LHLDW1009PEZZ R Holder JBTN-0139GJKC X Button, Vol-up/down, LHLDW1033PEZZ R Holder CH-up/down, Menu...

  • Page 27: Packing Of The Set

    29MU70 PACKING OF THE SET Polyethylene Bag Operation Manual Infrared R/C unit Batteries Polyethylene Mat Buffer Material FRONT Packing Case Use tape to fix the top side of packing case. REAR No. Card Label Use 12 staples to fix the bottom side of packing case.
  • Page 28 SHARP ELECTRONICA MEXICO S. A. DE C. V. TQ0000-S D SEM P SEMEX Blvd. SHARP No. 3510 Parque Industrial June.