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Sharp GX-68Z Service Manual

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DOLBY
SYSTEM @
Dolby noise reduction manufactured under license from Dolby Labora-
tories Licensing Corporation.
" Dolby" and the double-D symbol [xl are trademarks of Dolby Labora-
tories Licensing Corporation.
NAMES OF PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ADJUSTMENT
SCHEMATIC DIAGRAM/WIRING SIDE OF P.W.BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . -12-23
EQUIVALENT CIRCUIT (BLOCK DIAGRAM) OF IC
EXPLODED VIEW
INDEX TO CONTENTS
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In the interests of user-safetythe set should be restored to its original
condition and only parts identical to those specified be used.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . *24-26
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  • Page 1 DOLBY SYSTEM @ In the interests of user-safetythe set should be restored to its original condition and only parts identical to those specified be used. Dolby noise reduction manufactured under license from Dolby Labora- tories Licensing Corporation. “ Dolby” and the double-D symbol [xl are trademarks of Dolby Labora- tories Licensing Corporation.

  • Page 2: Specifications

    FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL. SPECIFICATIONS AC 11 OV- 127V/22OV-24OV, 50/60 Hz Power source: Frequency range: FM; 88 - 108 MHz DC 15V (External DC input) DC 1.5V (UM/SUM-3 or R6 x 1) (for clock/ timer) SW2;...

  • Page 3: Names Of Parts

    NAMES OF PARTS...
  • Page 4 DISASSEMBLY Caution on Disassembly Follow the below-mentioned notes when disassembling the unit and reassembling it, to keep its safety and excellent performance: 1. Take cassette tape of the unit. 2. Be sure to remove the power supply plug from the wall outlet before starting to disassemble the unit and remove the batteries from the unit.
  • Page 5 Figure 5 BLOCK DIAGRAM...
  • Page 6 PROPER REMOTE CONTROL Aim (within range of 60’ with no obstacles) the remote control at the remote control sensor and operate as shown. Notes concerning use: ation becomes erratic. control and the sensor on the main unit with soft cloth. Exposing the sensor on the main unit to strong light can interfere with operation.
  • Page 7 , Bock Chossis Front Figure 7 - 1 F i g u r e 7 - 3 Volume PW B Figure 7-2 Front Panel Timer PWB LED PWB, w Microphone PW B--f Level Meter P W B Figure 7 - 4...
  • Page 8 Figure 10 ADJUSTMENT POINTS...

  • Page 9: Mechanism Section

    . Driving Force check Position of each switch or control Volume Beat cancel switch Play: TW-2412 Over 50 g Center Graphic equalizer Reverse play: TW-2422 Over 60 g Normal Tape selector switch Function Tape . Torque Check Dolby NR Swrtch Specified value Torque Meter Taoe 1...

  • Page 10: Tuner Section

    ADJUSTMENT . A M I F / R F Specified value/ Specified value/ Test Stage instrument Connection Test Stage Instrument Connection Adjusting Point Adjusting Point Detection MW band Input: Antenna coverage Band coverage Output: Pin 9 of IC2 88.0 MHz: Ll Tracking 108.0 MHz: TCl .

  • Page 11: Function Table Of Ic

    FUNCTION TABLE OF IC FUNCTIONS AND RECEPTION CODE...

  • Page 12: Notes On Schematic Diagram

    NOTES ON SCHEMATIC DIAGRAM . Resistor: . Parts marked with “ A” (-243) are important for To differentiate the units of resistors, such symbol as K is the safety of the set. Be sure to these parts with specified ones for maintaining the safety and performance used: the symbol K means 1000 ohm and the resistor of the set.
  • Page 13 NOTES ON SCHEMATIC DIAGRAM can be found on page 12. - 1 3 -...
  • Page 14 I’ SCHEMATIC DIAGRAM (l/3) - 1 4 -...
  • Page 15 Figure 15 WIRING SIDE OF P - 1 5 -...
  • Page 16 IDE OF - 1 6 -...
  • Page 17 NOTES ON SCHEMATIC DIAGRAM can be found on page 12.
  • Page 18 CONTROL SCHEMATIC DIAGRAM (Z/3) - 1 8 -...
  • Page 19 Figure 19 WIRING SIDE OF P.\...
  • Page 21 1. 14v FINE TUNING Figure 21 5X.X...

  • Page 22: Schematic Diagram

    4. 7K MODE VOLTAGE MODE VOLTAGE 3. 3K 3. 31 - 4 - A 0.022 0. 047 SCHEMATIC DIAGRAM (3/3) - 2 2 -...
  • Page 23 Figure...
  • Page 24 LR3441 DOUBLER OUTPUT ALARM OUTPUT CONTROL CIRCUIT DECODER AND BUFFER SWITCH INPUT SEGMENT OUTPUT COMMON OUTPUT PLAY LA2746 Figure 24 EQUIVALENT CIRCUIT (BLOCK DIAGRAM) OF IC...
  • Page 25 BA6124 “CC O”TP”T2 STAGE2 STAGE 1 I N+ I N - B I A S v c c STAGE3 STAGE4 STAGE5 Figure 25 EQUIVALENT CIRCUIT (BLOCK DIAGRAM) OF IC...

  • Page 26: Ac Power Supply Cord

    LB1641 BUFFER o s c CONSTANT VOLTAGE Figure 26 EQUIVALENT CIRCUIT (BLOCK DIAGRAM) OF IC AC POWER SUPPLY CORD...
  • Page 27 Figure 27 TAPE MECHANISM EXPLODED VIEW...
  • Page 28 Figure 28 CABINET EXPLODED V I E W...
  • Page 29 7 0 3...

  • Page 30: Replacement Parts List

    REPLACEMENT PARTS LIST “HOW TO ORDER REPLACEMENT PARTS” To have your order filled promptly and correctly, please furnish the following information. 1. M O D E L N U M B E R 2. REF. NO. 3. PART NO. 4. DESCRIPTION NOTE: Parts marked with “8”...
  • Page 31 PART NO. DESCRIPTION CODE PART NO. DESCRIPTION CODE NO. VCOOMF(MN)OOOOOOO; this MF(MN) does not mean the lead wire.) Unless otherwlse specified, electrolytic capacitors are +20% type COILS VCCSMF lHL4R7 J VCCRMF lHH2 20 J V C C C M F lHH3R3C J 3.3 pF (CH),SOV L342 L443 L451...
  • Page 32 CODE PART NO. CODE DESCRIPTION PART NO. DESCRIPTION C243 C244 C251 C284 C285 C286 C287 C288 c313 C626 c314 C316 C342 VCCSMF lHL33 0 J c343 C658 c344 c347 C348 C663 C671 RC- EZY 2 2 5AF 1H R C - E Z Y 10 5AF 1H VCTYMF 1 EX8 2 2K RESISTORS (Unless otherwise specified, resistors are i5%,carbon type.) (Tubular type...
  • Page 33 PART NO. DESCRIPTION CODE PART NO. DESCRIPTION CODE R422 R441.442 F i l m A A R446 R125 R452 Film R455 R456 R457 R200 R462 F i l m A A R463 F i l m A A R464 R465 Film F i l m A A Film...

  • Page 34: Other Circuitry

    PART NO. DESCRIPTION CODE PART NO. DESCRIPTION CODE CNS403 Part of Ref. No.Bl403 8 2 ohms,l/6W CNS407 R633 Connector Ass’ y,PPin with D442 CNS505 Part of Ref. No.B1601A/B Part of Ref. No.Bl602 Part of Ref. No.Bl901 Part of Ref. No.T951 CNS952 Part of Ref.
  • Page 35 PART NO. DESCRIPTION CODE PART NO. DESCRIPTION CODE [Tape 21 [Tape [Tape Lever [Tape 21 [Tape 21 [Tape 21 [Tape 21 35 - [Tape [Tape [Tape 21 [Tape [Tape 11 [Tape 21 11 A D [Tape [Tape 11 [Tape 21 Flexible PWB [Tape [Tape 11 Spring [Tape...

  • Page 36: Cabinet Parts

    PART NO. DESCRIPTION CODE PART NO. DESCRIPTION CODE [Tape [Tape [Tape CABINET PARTS [Tape 9 2 LCAB 14 2 4AASY J Front Panel Ass’ y [Tape [Tape Meter [Tape Front Panel(Not Replacement Item) [Tape P F i LW0053AFZZ J Filter,Remote C o n t r o l 201-10 [Tape [Tape...

  • Page 37: Accessories/Packing Parts

    PART NO. DESCRIPTION CODE PART NO. DESCRIPTION CODE Control Selector/Tape Speed ACCESSORIES/PACKING PARTS Timer/Dolby NR (For Australia) Accessories P S H E G O 157AFZZ J Sheet,Radiation 9 2 LC-PAD13 2 28 J Protection Pad,Cassette Holder 277 - Power Switch/Volume/ AM Matching/Fine Tuning/LED (Combined Level Meter/Headphones/...
  • Page 38 Writer and Editor: Quality & Reliability Control Center of Audio Systems Group, Sharp...

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