JVC JX-S555 Service Manual
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JVC JX-S555 Service Manual

JVC JX-S555 Service Manual

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SERVICE MANUAL
Contents
Safety Precautions ...............................
Main Parts Locations ............................ 3
Disassembly of Parts ............................ 4
Connection Diagram ............................. 6
Circuit Description ................................ 7
Design and specifications are subject to change without notice.
AV SELECTOR
JX-S555 (J)
2
COPYRIGHT
2001 VICTOR COMPANY OF JAPAN, LTD.
Adjustments ......................................... 11
Servicing Guidelines ............................ 13
Block View Inside IC ............................. 17
JX-S555(J)
No.70251
Mar. 2001

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  • Page 1: Table Of Contents

    JX-S555(J) SERVICE MANUAL AV SELECTOR JX-S555 (J) Contents Safety Precautions ....... Adjustments ......... 11 Main Parts Locations ......3 Position of ICs and Adjustment Points ..12 Disassembly of Parts ......4 Servicing Guidelines ......13 Connection Diagram ......6 Block View Inside IC ......

  • Page 2: Safety Precautions

    JX-S555(J) Safety Precautions 1. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer.

  • Page 3: Main Parts Locations

    JX-S555(J) Main Parts Locations Top cover AUDIO 1 board AUDIO 2 board Front 2 board Front panel ass'y Front 1 board Jack board MAIN board Bottom chassis Rear panel (No. 70251) 3...

  • Page 4: Disassembly Of Parts

    JX-S555(J) Disassembly of Parts 4 (No. 70251)
  • Page 5 JX-S555(J) Note : For the positions of the connectors, see the connection diagram (page 6). Removing the top cover 1 1. Remove the two screws 3 retaining the top cover 1 from the rear panel 2, then remove the four screws 4 retaining the top cover from the side panels.

  • Page 6: Connection Diagram

    JX-S555(J) Connection Diagram 6 (No. 70251)

  • Page 7: Circuit Description

    JX-S555(J) Circuit Description 1. IC2 (µPD780021ACWW01) The µPD780021ACWW01 is a 64-pin, 8-bit single-chip microcomputer with an 8K-byte ROM and 512-byte RAM. Pin Name Pin No. Function P40/AD0 P41/AD1 Key scan inputs. P42/AD2 P43/AD3 P44/AD4 Key scan outputs. P45/AD5 P46/AD6 Scan signal outputs for LED lighting.
  • Page 8 JX-S555(J) Pin Name Pin No. Function C path Data signal. C path Clock signal Not used. Not used. Not used. P20/SI30 Not used. P21/SO30 Not used. P22/SCK30 Not used. P23/RxD0 Not used. P24/TxD0 Not used. P25/ASCK0 Not used. Positive potential (except for the port).
  • Page 9 JX-S555(J) 2. M101, M102 (J46729-002) • Comb filter module Buffer C-OUT VIDEO-IN Buffer 1H-GDL Matrix Delay Buffer Y-OUT Line (No. 70251) 9...
  • Page 10 JX-S555(J) 3. IC101 (CXA2079Q) The CXA2079Q is an AV switcher IC with 5 video inputs, 2 video outputs, 5 stereo audio inputs and 2 stereo audio outputs, featuring the I C bus compatibility for TV. Among the 5 video inputs, 4 inputs are compatible with the S2 and S-Video standards.

  • Page 11: Adjustments

    JX-S555(J) Adjustments Instruments required for adjustments 1. Oscilloscope 2. TV signal generator (NTSC) Test Point Adjustment Point Name Condition Condition 2CH C output VR101 C output level Apply color bar signal to Adjust VR101 so that the C output level at 2CH is 1CH video input (V).

  • Page 12: Position Of Ics And Adjustment Points

    JX-S555(J) Position of ICs and Adjustment Points MAIN board 12 (No. 70251)

  • Page 13: Servicing Guidelines

    JX-S555(J) Servicing Guidelines 1. Reference input signals Video signals V → Full-field color bar (white 100%), 1.0 Vp-p Y → 1.0 Vp-p (with sync) C → Burst level 0.286 Vp-p, chroma only Audio signal 1 kHz, -10 dBV sine wave 2.
  • Page 14 JX-S555(J) Symptom Check Points Normal Voltage/Waveform Check Results and Failures 8. The S-Video (Y) Q131: Emitter Go to check inputs at CH1 to (C) Q133: Emitter Check IC107, IC108, output buffer 2.0 Vp-p CH4 are not and their surroundings. displayed.
  • Page 15 JX-S555(J) Symptom Check Points Normal Voltage/Waveform Check Results and Failures 11. The S-Video (Y) Q104: Emitter Check Q101 to Q104, Q119, Q120 input at CH5 is (C) Q102: Emitter and their surroundings. 2.0 Vp-p not output at the Go to check Monitor output.
  • Page 16 JX-S555(J) Symptom Check Points Normal Voltage/Waveform Check Results and Failures 14. Malfunction in Q107: Emitter Check IC101 and surroundings. Y/C mixing of (Monitor output: Q115 emitter) Check IC103 and their surroundings. 2.0 Vp-p CH1 to CH4 inputs. 15. Malfunction in...

  • Page 17: Block View Inside Ic

    JX-S555(J) Block View Inside IC IC1 M51957AL [MITSUBISHI] IC4 HD74HC375FP [HITACHI] G1·2 G1·2 G3·4 (11) (10) (12) G3·4 (13) (15) (14) (TOP VIEW) TRUE TABLE INPUTS OUTPUTS FUNCTION LATCH X: Don’t care IC2 uPD780021ACWW01 (No. 70251) 17...
  • Page 18 JX-S555(J) IC101 CXA2079Q IC102-108 TC74HC4066AP [TOSHIBA] IC801-807 NJM4580D [JRC] 18 (No. 70251)
  • Page 19 JX-S555(J) IC401-402, 808-809 TC74HC4052AP IC701 GP1U261R [SHARP] [TOSHIBA] MODULATOR COMPARATOR LIMITER B.P.F INTEGRATOR IC901 M5230L [MITSUBISHI] OUTPUT CONTROL INPUT (+) OUTPUT INPUT (+) CONTROL OVERHEAT PROTECTOR OUTPUT (+) START CIRCUIT VOLTAGE ADJUSTMENT REFERENCE OVER ERROR CURRENT VOLTAGE 6 OUTPUT (+)
  • Page 20 JX-S555(J) IC902-903 uPC1093J [NEC] IC904 PQ09RD08 [SHARP] TO-92 PACKAGE MARKED SURFACE DC input (Vin) DC output (Vout) ON/OFF control terminal (Vc) 1 2 3 4 Spesific IC IC3 TC74HC04AP [TOSHIBA] IC403 TC74HC126AP [TOSHIBA] 14 Vcc 14 Vcc 1G 1 13 4G...
  • Page 21 JX-S555(J) VICTOR COMPANY OF JAPAN, LIMITED COMMUNICATION NETWORK BUSINESS UNIT, 1644, SHIMOTSURUMA, YAMATO-SHI, KANAGAWA-KEN, 242-8514, JAPAN Printed in Japan No.70251 0103(S)
  • Page 22 JX-S555(J) Electric Parts List MAIN P.W. Board Ass’y A Ref. No. A Ref. No. Parts No. Parts Name, Description Parts No. Parts Name, Description PWBA J22034-001 Main Board Assembly D120 1SS120 Diode HITACHI The partwill not be supplied as an assembly.
  • Page 23 JX-S555(J) A Ref. No. A Ref. No. Parts No. Parts Name, Description Parts No. Parts Name, Description Q106 2SC3052 Transistor MITSUBISHI Q402 2SC3052 Transistor MITSUBISHI Q107 2SC3052 Transistor MITSUBISHI Q403 2SC3052 Transistor MITSUBISHI Q108 2SC3052 Transistor MITSUBISHI Q404 2SC4432 Transistor...
  • Page 24 JX-S555(J) A Ref. No. A Ref. No. Parts No. Parts Name, Description Parts No. Parts Name, Description NRSA02J-103NY M.G.Resistor 10kΩ,1/10W R164 NRSA02J-152NY M.G.Resistor 1.5kΩ,1/10W R165 NRSA02J-102NY M.G.Resistor 1kΩ,1/10W NRSA02J-103NY M.G.Resistor 10kΩ,1/10W R166 NRSA02J-681NY M.G.Resistor 680Ω,1/10W NRSA02J-103NY M.G.Resistor 10kΩ,1/10W R167 NRSA02J-152NY M.G.Resistor...
  • Page 25 JX-S555(J) A Ref. No. A Ref. No. Parts No. Parts Name, Description Parts No. Parts Name, Description R248 NRSA02J-680NY M.G.Resistor 68Ω,1/10W R401 NRSA02J-750NY M.G.Resistor 75Ω,1/10W R249 NRSA02J-680NY M.G.Resistor 68Ω,1/10W R402 NRSA02J-750NY M.G.Resistor 75Ω,1/10W R250 NRSA02J-680NY M.G.Resistor 68Ω,1/10W R406 NRSA02J-224NY M.G.Resistor 220kΩ,1/10W...
  • Page 26 JX-S555(J) A Ref. No. A Ref. No. Parts No. Parts Name, Description Parts No. Parts Name, Description R822 NRSA02J-473NY M.G.Resistor 47kΩ,1/10W QER51CM-106G E.Capacitor 10uF ,16V R823 NRSA02J-473NY M.G.Resistor 47kΩ,1/10W QER51CM-106G E.Capacitor 10uF ,16V R824 NRSA02J-473NY M.G.Resistor 47kΩ,1/10W QETB1AM-107 E.Capacitor 100uF,10V...
  • Page 27 JX-S555(J) A Ref. No. A Ref. No. Parts No. Parts Name, Description Parts No. Parts Name, Description C148 QER51CM-107 E.Capacitor 100uF ,16V C405 QER51CM-476 E.Capacitor 47uF ,16V C149 QER51CM-107 E.Capacitor 100uF ,16V C406 QER51CM-476 E.Capacitor 47uF ,16V C150 NCB31HK-103AY Cer.Capacitor 0.01uF ,50V...
  • Page 28 JX-S555(J) A Ref. No. A Ref. No. Parts No. Parts Name, Description Parts No. Parts Name, Description A C901 J46829-104 FilmCapacitor 0.1uF ,AC250V J45085-001 P .W.B.Connector A C902 J46829-104 FilmCapacitor 0.1uF ,AC250V A C903 J46578-157 E.Capacitor 150uF,200V JNV7S14-8001 P .W.B.Connector...
  • Page 29 JX-S555(J) FRONT 1/FRONT 2/AUDIO 1/AUDIO 2 PCB Ass’y A Ref. No. A Ref. No. Parts No. Parts Name, Description Parts No. Parts Name, Description PWBA J33650-001 Sub Board Assembly R841 NRSA02J-561NY M.G.Resistor 560W,1/10W The partwill not be supplied R842 NRSA02J-561NY M.G.Resistor...
  • Page 30 JX-S555(J) Jack P.W. Board Ass’y WIRE A Ref. No. A Ref. No. Parts No. Parts Name, Description Parts No. Parts Name, Description PWBA J33651-001 Jack Board Assembly JWR1407-10BB Flat Wire For CN3,CN701 The partwill not be supplied J46972-001 AC Cord as an assembly.
  • Page 31 JX-S555(J) Exploded Views AC cord AUDIO 2 board AUDIO 1 board MAIN board Front 1 board Front 2 board Jack board 10 (No. 70251)
  • Page 32 JX-S555(J) Mechanical Parts List M 1 M M Item No. Parts No. Parts Name Q'ty Remarks J11527-001SA Front Panel Ass'y J21104-002T Top Cover J33585-001 Rear Panel J33523-002 Bottom Chassis J46912-001 Spacer Front 1 board, 2mm J44036-001 Locking Card Spacer KGLS-8RT, Bottom chassis...
  • Page 33 JX-S555(J) Packing Taping Main unit Front marking 12 (No. 70251)
  • Page 34 Remarks J5500-105A Instructions English, French and Spanish BT-51005-4 Warranty Card BT-51006-1 Registration Card PU33941-3-3 JVC Safety Guide RM-AJ555 Remote Control Unit Enveloped with battery cover. J33017-002 Battery Cover For RM-AJ555 Battery R6/AA Parts marked (A) are safety parts. When replacing, be sure to use the specified one.
  • Page 35 JX-S555(J) MEMO 14 (No. 70251)

  • Page 36: Block Diagrams

    JX-S555(J) Block Diagrams IC101 VIDEO VIDEO IC103 VIDEO 1-4 VIDEO VIDEO INPUT1 S-VIDEO S-VIDEO OUTPUT1 M101 AUDIO AUDIO IC102 5VIDEO LOOP Y/C MIXER SEPARATOR IC104 PROTECT VIDEO VIDEO S-VIDEO 1-4 S-VIDEO S-VIDEO INPUT2 S-VIDEO S-VIDEO OUTPUT2 AUDIO AUDIO AUDIO AUDIO...
  • Page 37 JX-S555(J) Notes on this schematic diagram Schematic Diagrams 1. Values are voltages measured with a circuit tester (internal resistance: 20 k /V) at respective points of the circuits with the power switch turned on. VIDEO 1 BLOCK 2. The circuit diagram printed in this service manual is just a standard. The circuitry and circuit constants are subject to change for improvement without notice.
  • Page 38 JX-S555(J) Notes on this schematic diagram VIDEO 2 BLOCK 1. Values are voltages measured with a circuit tester (internal resistance: 20 k /V) at respective points of the circuits with the power switch turned on. 2. The circuit diagram printed in this service manual is just a standard. The circuitry and circuit constants are subject to change for improvement without notice.
  • Page 39 JX-S555(J) Notes on this schematic diagram COMPONENT BLOCK 1. Values are voltages measured with a circuit tester (internal resistance: 20 k /V) at respective points of the circuits with the power switch turned on. 2. The circuit diagram printed in this service manual is just a standard. The circuitry and circuit constants are subject to change for improvement without notice.
  • Page 40 JX-S555(J) Notes on this schematic diagram AUDIO BLOCK 1. Values are voltages measured with a circuit tester (internal resistance: 20 k /V) at respective points of the circuits with the power switch turned on. 2. The circuit diagram printed in this service manual is just a standard. The circuitry and circuit constants are subject to change for improvement without notice.
  • Page 41 JX-S555(J) Notes on this schematic diagram CPU BLOCK 1. Values are voltages measured with a circuit tester (internal resistance: 20 k /V) at respective points of the circuits with the power switch turned on. 2. The circuit diagram printed in this service manual is just a standard. The circuitry and circuit constants are subject to change for improvement without notice.
  • Page 42 JX-S555(J) Notes on this schematic diagram POWER BLOCK 3. Parts marked with A (in the shaded 1. Values are voltages measured with a circuit tester (internal resistance: 20 k /V) area) are important as safety parts. at respective points of the circuits with the power switch turned on.
  • Page 43 JX-S555(J) FRONT 1 BLOCK FRONT 2 BLOCK 5.3V 1.7V 1.7V 5.3V 1.7V 1.7V 5.9V 5.9V 5.3V 1.7V 1.1V 1.7V AUDIO 1 BLOCK 2.1V 1.7V AUDIO 2 BLOCK 1.4V 1.7V JACK P.W.B. 4.5V 5.1V 4.5V C422 5.1V 5.1V 1.8V 8 (No. 70251SCH)
  • Page 44 JX-S555(J) Circuit Boards MAIN BOARD (J22026-001) (No. 70251SCH) 9...
  • Page 45 JX-S555(J) MAIN BOARD Symbol Q173 D438 R181 R301 R822 C150 CJ130 J160 J257 J352 Address Q174 D439 R182 R302 R823 C151 CJ131 J161 J258 J353 Q175 D440 R183 R303 R824 C152 C811 CJ132 J162 J259 J354 Q176 D441 R184 R304...
  • Page 46 JX-S555(J) SUB BOARD (J33641-001) SUB BOARD Symbol Others Address CN701 • FRONT 2 BOARD CN702 CN807 IC701 CN808 CN809 Transistor CN810 J1001 Q701 J1002 Q702 J1003 Q703 J1004 Q704 J1005 Q705 J1006 Q706 J1007 Q707 J1008 J1009 Diode J1010 J1011...

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