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JVC HX-Z3 Service Manual
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JVC HX-Z3 Service Manual

JVC HX-Z3 Service Manual

Compact component system
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See also: Instruction Manual
SERVICE MANUAL
COMPACT COMPONENT SYSTEM
Contents
Safety precautions
Preventing static electricity
Important for laser products
Disassembly method
Adjustment method
HX-Z3
1-2
Flow of functional operation
1-3
1-4
Maintenance of laser pickup
1-5
Replacement of laser pickup
1-21
Description of major ICs
COPYRIGHT
2002 VICTOR COMPANY OF JAPAN, LTD.
Area Suffix
UW ---------- Brazil,Mexico,Peru
until TOC read (CD)
HX-Z3
1-25
1-26
1-26
1-27~35
No.21141
Aug. 2002

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Summary of Contents for JVC HX-Z3

  • Page 1 HX-Z3 SERVICE MANUAL COMPACT COMPONENT SYSTEM HX-Z3 Area Suffix UW ---------- Brazil,Mexico,Peru Contents Safety precautions Flow of functional operation Preventing static electricity until TOC read (CD) 1-25 Important for laser products Maintenance of laser pickup 1-26 Disassembly method Replacement of laser pickup...
  • Page 2 HX-Z3 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. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified personnel only.

  • Page 3: Preventing Static Electricity

    HX-Z3 Preventing static electricity 1. Grounding to prevent damage by static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.

  • Page 4: Important For Laser Products

    HX-Z3 Important for laser products 5.CAUTION : If safety switches malfunction, the laser is able 1.CLASS 1 LASER PRODUCT to function. 2.DANGER : Invisible laser radiation when open and inter 6.CAUTION : Use of controls, adjustments or performance of lock failed or defeated. Avoid direct exposure to beam.

  • Page 5: Disassembly Method

    HX-Z3 Metal cover Disassembly method <Main board> Removing the metal cover (See Fig.1 ~ 3) Remove the six screws A on the back of the body. Remove the screw B on each side of the body. Remove the metal cover from the body by lifting the rear part of the cover.
  • Page 6 HX-Z3 Front panel assembly Removing the front panel assembly (See Fig.6 ~ 9) Bridge board CN701 Prior to performing the following procedure, remove the metal cover and the CD changer mechanism assembly. Disconnect the card wires from connector CN44 and...
  • Page 7 HX-Z3 Removing the antenna board (See Fig.10, 11) Antenna board Rear panel Prior to performing the following procedure, remove the metal cover. REFERENCE: There is no need to remove the CD changer mechanism assembly. Disconnect the card wire from connector CN1 on the antenna board on the right side of the body.
  • Page 8 HX-Z3 Removing the rear panel (See Fig.12 ~ 16) Inner bar Plastic rivets Prior to performing the following procedure, remove the metal cover and the CD changer mechanism assembly. Remove holding board by remove two plastic rivets and then slide out the holding board as shown in fig.
  • Page 9 HX-Z3 Removing the T.flux board Front assembly (See Fig.17, 18) Rear panel T.flux board Prior to performing the following procedure, remove the metal cover and the CD changer mechanism assembly . Disconecct the card wire from connector CN102 on the T.flux borad.
  • Page 10 HX-Z3 Removing the bridge board / regulator Plastic rivet board / heat sink (See Fig.22 ~ 27) Prior to performing the following procedure, remove the metal cover, the CD changer mechanism Inner bar assembly, the rear panel, the antenna board and main board.
  • Page 11 HX-Z3 Remove the two screws J attaching the heat sink bracket. Bridge board Remove the two screws M, detach bridge board from regulator board by disconnect connector CN205. Remove the two screws K and two screws L to detach regulator board from heat sink.

  • Page 12: Front Panel Assembly

    HX-Z3 Removing power transformer assembly (See Fig.28, 29) Power transformer assembly Prior to performing the following procedure, remove the metal cover, the CD changer mechanism assembly, the rear panel, the main board and the bridge board / regulator board. Remove the screw N attaching the primary board.
  • Page 13 HX-Z3 Removing the display system control board (See Fig.33,34) Remove the four screws S attaching the stay bracket (1). Display system Disconnect the card wires from connector CN43 and control board CN880 on the display system control board. Stay bracket (1)
  • Page 14 HX-Z3 <CD Changer Mechanism Type:VC3section> Remove the CD changer mechanism assembly. Removing the CD Servo control board (See Fig.1) CN854 From bottom side the CD changer mechanism CN651 assembly,remove the four screws A retaining the CD servo control board. CD servo control board Absorb the four soldered positions a of the right and left motors with a soldering absorber.
  • Page 15 HX-Z3 Check whether the lifter unit stopper has been caught into the hole at the section e of CD tray Stopper assembly as shown in Fig.5. Make sure that the driver unit elevator is positioned as shown in Fig.6 from to the second or fifth hole on the left side face of the CD changer mechanism assembly.
  • Page 16 HX-Z3 Removing the CD loading mechanism Cams R1, R2 assembly assembly(See Fig.10) While turning the cams R1 and R2 assembly in the arrow direction h ,align the shaft of the CD Arrow loading mechanism assembly to the position shown in Fig.10.
  • Page 17 HX-Z3 Removing the try select switch board (See Fig.14) Chassis assembly Remove the two screws G retaining the tray select switch board. Tray select switch board Disconnect the tray select switch board from connector CN854 on the CD servo control board.
  • Page 18 HX-Z3 Removing the actuator motor and belt (See Fig.18~21) Remove the two screws I retaining the gear bracket. Gear bracket While pressing the pawl t fixing the gear bracket in the arrow direction, remove the gear bracket. From the notch u section on the chassis assembly...
  • Page 19 HX-Z3 Removing the cams R1/R2 assembly and cam gear q(See Fig.22) Remove the slit washer fixing the cams R1 and R2 assembly. By removing the two pawls w fixing the cam R1, Slit washer separate R2 from R1. Cam R2 Slit washer Remove the slit washer fixing the cam gear q .
  • Page 20 HX-Z3 Removing the Pickup unit Pickup unit Chassis base (See Fig.24 and 25) Joint a Turn the cam gear in the direction of the arrow to Pickup unit move the pickup unit toward the center. Extend the guide shaft stopper in the direction of the...

  • Page 21: Adjustment Method

    HX-Z3 Adjustment method Measurement Instruments Required for Tuner section FM Band cover: 87.5~108.0MHz Adjustment AM Band cover: 531~1,710kHz(9kHz step) 1. Low frequency oscillator 530~1,710kHz(10kHz step) This oscillator should have a capacity to output 0dBs to 600 at an oscillation frequency of Voltage applied to tuner +B : DC5.7V...
  • Page 22 HX-Z3 << >> Arrangement of Adjusting Position Cassette mechanism section Cassette mechanism section (Back side) Head azimuth Head azimuth adjusting screw adjusting screw (Forward side) (Reverse side) Head azimuth Head azimuth Playback/Recording & adjusting screw adjusting screw eraser head (Forward side)
  • Page 23 HX-Z3 Tape Recorder Section Measurement Adjusting Standard Items Measurement method conditions positions Values Adjust the head Confirmation Test tape 1 Playback the test tape VT703L (8kHz) Maximum azimuth screw of head angle : VT703L (8kHz) 2 With the recording & playback mechanism,...
  • Page 24 HX-Z3 Electrical Performance Adjusting Measurement Standard Items Measurement method positions conditions Values VR31 AC-225 Adjustment of Mode: Forward or 1 With the recording and playback : 4.20 recording bias reverse mode mechanism, load the test tapes (AC-514 to AC-514 current...

  • Page 25: Flow Of Functional Operation Until Toc Read

    HX-Z3 Flow of functional operation until TOC read Check Point Slider turns REST Play Key Power ON Confirm that the voltage at the pin5 SW ON. of CN801 is "H"\"L"\"H". Automatic tuning of TE offset Check that the voltage at the...

  • Page 26: Maintenance Of Laser Pickup

    HX-Z3 Maintenance of laser pickup Replacement of laser pickup (1) Cleaning the pick up lens Before you replace the pick up, please try to Turn off the power switch and, disconnect the clean the lens with a alcohol soaked cotton power cord from the ac outlet.

  • Page 27: Description Of Major Ics

    HX-Z3 Description of major ICs BU2092(IC811): EXT IC 1.Terminal Layout DATA CLOCK CONTROL CIRCUIT 2.Pin Function Symbol Function Pin No. Connect to GND DATA Serial Data input CLOCK Shift Clock of Data Latch Clock of Data 5~16 Q0~Q11 Parallel Data Output...

  • Page 28: Block Diagram

    HX-Z3 BH3874AKS2 (IC434) : Volume 1. Pin layout 2. Block diagram 63 64 3 4 7 8 11 12 -9dB FILTER INLD -30dB~- 0~30dB INLC 11dB INLB OUTL INLA 5 BAND EQ BASS5 19dB FILTER 5 BAND EQ 11dB INRA 10.5Hz...
  • Page 29 HX-Z3 3. Pin function Pin NO. Name Function Pin NO. Name Function F1R1 Rch GREQ f1 filter setting pin Serial data larch receiving pin F1R2 Rch GREQ f1 filter setting pin Serial clook receiving pin F2L1 Lch GREQ f2 filter setting pin...
  • Page 30 HX-Z3 KIA7808API (IC303) : Regulator 1. Pin layout 1.VCC 2.GND 3.OUTPUT 2.Block diagram INPUT Q11-1 OUTPUT COMMON (GND) 1-30...
  • Page 31 HX-Z3 KIA7812API (IC240) : Regulator 1. Pin layout 1.VCC 2.GND 3.OUTPUT 2.Block diagram INPUT Q11-1 OUTPUT COMMON (GND) 1-31...
  • Page 32 HX-Z3 STK412-020 (IC701) : SW power IC 1. Pin layout 2.Block diagram TR41 18 17 Comparator TR12 TR11 TR16 TR19 R1 C1 TR14 TR13 TR18 TR20 TR10 TR15 TR17 Comparator TR51 9 8 11 10 1-32...
  • Page 33 HX-Z3 UPD784975AGF305 (IC810) : Main micon 1. Pin layout 2. Pin function Pin NO. Name Function Pin NO. Name Function AVDD AD VDD, same as VDD1 SPI A SPI A data SPIDTI SPI analog input SPI B SPI B data...
  • Page 34 HX-Z3 KIA7805API (IC360) : Regulator 1. Terminal layout 1.VCC 2.GND 3.OUTPUT NJM4580D (IC501,IC502,IC571) : Input amp, AHB control 1.Terminal layout A OUT A -IN B OUT A +IN B -IN B +IN (TOP VIEW) 2.Block diagram INPUT OUTPUT 1-34...
  • Page 35 HX-Z3 STK402-070 (IC602) : Main power IC 1. Terminal layout 2. Block diagram +VCC PRE+VCC -LIN -VCC1 SUB GND 1-35...
  • Page 36 HX-Z3 VICTOR COMPANY OF JAPAN, LIMITED AUDIO & COMUNICATION BUSINESS DIVISION PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan Printed in Japan (No.21141) 200208...

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