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JVC KD-G255 Service Manual

Cd receiver
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3 7 63 1515 0
SERVICE MANUAL
2
2004
MA056
TE
L 13942296513
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
5
TROUBLE SHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
www
.
http://www.xiaoyu163.com
CD RECEIVER
KD-G255
ATT
SOUND
U
F
R
SOURCE
D
VOL
VOL

TABLE OF CONTENTS

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ao
u163
y
i
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED
http://www.xiaoyu163.com
2 9
8
Q Q
3
6 7
1 3
1 5
U --------- Other Areas
co
.
9 4
2 8
0 5
8
2 9
9 4
2 8
Area Suffix
m
No.MA056
9 9
9 9
2004/2

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Summary of Contents for JVC KD-G255

  • Page 1: Table Of Contents

    3 7 63 1515 0 SERVICE MANUAL CD RECEIVER MA056 2004 KD-G255 SOUND SOURCE L 13942296513 Area Suffix U --------- Other Areas TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 http://www.xiaoyu163.com 3 7 63 1515 0 SPECIFICATION AUDIO AMPLIFIER SECTION Maximum Power Output Front 50 W per channel Rear 50 W per channel 19 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more Continuous Power Output (RMS) Front than 0.8% total harmonic distortion.

  • Page 3: Precaution

    http://www.xiaoyu163.com 3 7 63 1515 0 SECTION 1 PRECAUTION Safety Precautions Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system. Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.
  • Page 4 http://www.xiaoyu163.com 3 7 63 1515 0 Preventing 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. 1.2.1 Grounding to prevent damage by static electricity Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players.
  • Page 5 http://www.xiaoyu163.com 3 7 63 1515 0 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.

  • Page 6: Specific Service Instructions

    http://www.xiaoyu163.com 3 7 63 1515 0 SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. L 13942296513 u163 1-6 (No.MA056) http://www.xiaoyu163.com...

  • Page 7: Disassembly

    http://www.xiaoyu163.com 3 7 63 1515 0 SECTION 3 DISASSEMBLY Main body 3.1.1 Removing the front panel assembly (See Fig.1) (1) Push the detach button in the lower right part of the front Front panel assembly panel assembly and remove the front panel assembly. Detach button Fig.1 3.1.2 Removing the bottom cover...
  • Page 8 http://www.xiaoyu163.com 3 7 63 1515 0 3.1.4 Removing the side panel (See Fig.4) • Prior to performing the following procedure, remove the front panel assembly as required. (1) Remove the screw B and two screws C attaching the side panel on the left side of the main body, and remove the side panel.
  • Page 9 http://www.xiaoyu163.com 3 7 63 1515 0 3.1.7 Removing the CD mechanism assembly (See Fig. 7) • Prior to performing the following procedure, remove the front panel assembly, bottom cover, side panel, rear bracket and main board. • Remove the front chassis assembly as required. (1) Remove the three screws H attaching the CD mechanism assembly on the top chassis.
  • Page 10 http://www.xiaoyu163.com 3 7 63 1515 0 CD Mechanism Assembly 3.2.1 Removing the top cover (See Figs.1 and 2) (1) Remove the two screws A on the both side of the body. (2) Lift the front side of the top cover and move the top cover backward to release the two joints a.
  • Page 11 http://www.xiaoyu163.com 3 7 63 1515 0 3.2.2 Removing the connector board Wires (See Figs.3 to 5) CAUTION: Before disconnecting the flexible wire from the pickup, solder the short-circuit point on the pickup. No observance of this in- struction may cause damage of the pickup. (1) Remove the screw B fixing the connector board.
  • Page 12 http://www.xiaoyu163.com 3 7 63 1515 0 3.2.3 Removing the DET switch (See Figs.6 and 7) (1) Extend the two tabs c of the feed sw. holder and pull out the switch. (2) Unsolder the DET switch wire if necessary. DET switch Connector board Pickup...
  • Page 13 http://www.xiaoyu163.com 3 7 63 1515 0 3.2.4 Removing the chassis unit (See Figs.8 and 9) • Prior to performing the following procedure, remove the top Chassis unit cover and connector board. Suspension spring (L) Suspension spring (R) (1) Remove the two suspension springs (L) and (R) attaching the chassis unit to the frame.
  • Page 14 http://www.xiaoyu163.com 3 7 63 1515 0 3.2.5 Removing the clamper assembly (See Figs.10 and 11) • Prior to performing the following procedure, remove the top cover. (1) Remove the clamper arm spring. Clamper arm spring (2) Move the clamper assembly in the direction of the arrow to release the two joints d.
  • Page 15 http://www.xiaoyu163.com 3 7 63 1515 0 3.2.6 Removing the loading / feed motor assembly (See Figs.12 and 13) • Prior to performing the following procedure, remove the top cover, connector board and chassis unit. (1) Remove the screw C and move the loading / feed motor assembly in the direction of the arrow to remove it from the chassis rivet assembly.
  • Page 16 http://www.xiaoyu163.com 3 7 63 1515 0 3.2.7 Removing the pickup unit Pickup unit (See Figs.14 to 18) • Prior to performing the following procedure, remove the top cover, connector board and chassis unit. (1) Remove the screw D and pull out the pu. shaft holder from Part e the pu.
  • Page 17 http://www.xiaoyu163.com 3 7 63 1515 0 3.2.9 Removing the trigger arm Joint k (See Figs.19 and 20) • Prior to performing the following procedure, remove the top cover, connector board and clamper unit. (1) Turn the trigger arm in the direction of the arrow to release Trigger arm the joint k and pull out upward.
  • Page 18 http://www.xiaoyu163.com 3 7 63 1515 0 3.2.11 Removing the mode sw. / select lock arm Link plate Joint t (See Figs.22 and 23) Mode sw. • Prior to performing the following procedure, remove the top plate assembly. Select lock arm (1) Bring up the mode sw.
  • Page 19 http://www.xiaoyu163.com 3 7 63 1515 0 3.2.12 Reassembling the mode sw. / select lock arm Select lock arm spring (See Figs.24 to 26) Hook w REFERENCE: Reverse the above removing procedure. Joint v (1) Reattach the select lock arm spring to the top plate and set Joint v the shorter end of the select lock arm spring to the hook w on the top plate.
  • Page 20 http://www.xiaoyu163.com 3 7 63 1515 0 3.2.13 Removing the select arm R / link plate Joint c' Link plate Joint r (See Figs.27 and 28) Joint b' Select arm R • Prior to performing the following procedure, remove the top plate assembly.
  • Page 21 http://www.xiaoyu163.com 3 7 63 1515 0 3.2.15 Removing the loading roller assembly Loading roller assembly (See Figs.31 to 33) • Prior to performing the following procedure, remove the Roller guide clamper assembly and top plate assembly. spring (1) Push inward the loading roller assembly on the gear side and detach it upward from the slot of the joint g' of the lock arm rivet assembly.
  • Page 22 http://www.xiaoyu163.com 3 7 63 1515 0 3.2.16 Removing the loading gear 5, 6 and 7 Loading gear bracket (See Figs.35 and 36) • Prior to performing the following procedure, remove the top Loading gear 6 cover, chassis unit, pickup unit and top plate assembly. (1) Remove the screw K attaching the loading gear bracket.
  • Page 23 http://www.xiaoyu163.com 3 7 63 1515 0 3.2.17 Removing the gears Joint p' (See Figs.37 to 40) • Prior to performing the following procedure, remove the top Change plate cover, chassis unit, top plate assembly and pickup unit. rivet assembly • Pull out the loading gear 3. (See Fig.35.) (1) Pull out the feed gear.
  • Page 24 http://www.xiaoyu163.com 3 7 63 1515 0 3.2.18 Removing the turn table / spindle motor Turn table (See Figs.41 and 42) • Prior to performing the following procedure, remove the top cover, connector board, chassis unit and clamper assembly. (1) Remove the two screws L attaching the spindle motor as- sembly through the slot of the turn table on top of the body.

  • Page 25: Adjustment

    (3) Digital tester Output Level Line out 2.0V (Vol. MAX) (4) Tracking offset meter (5) Test Disc JVC :CTS-1000 Dummy load (6) Extension cable for check Exclusive dummy load should be used for AM,and FM. For FM EXTSH002-22P × 1 dummy load,there is a loss of 6dB between SSG output and antenna input.The loss of 6dB need not be considered since...

  • Page 26: Trouble Shooting

    http://www.xiaoyu163.com 3 7 63 1515 0 SECTION 5 TROUBLE SHOOTING Feed section Is the voltage output at Is the wiring for IC521 Is 5V present at IC561 Check CD 8V. IC521 pin 22 5v or 0V pin 22 correct? pins 3,12 and 21? Check the vicinity of IC521.
  • Page 27 http://www.xiaoyu163.com 3 7 63 1515 0 Signal processing section Is the sound output from No sound from either Compare the L-ch and both channels (L, R)? channel. R-ch to locate the defective point. Normal Is 9V present at IC161 pin Check the vicinity of the IC901 audio power supply.
  • Page 28 http://www.xiaoyu163.com 3 7 63 1515 0 Maintenance of laser pickup Replacement of laser pickup (1) Cleaning the pick up lens Before you replace the pick up, please try to clean the lens Turn off the power switch and,disconnect the with a alcohol soaked cotton swab. power cord from the ac outlet.
  • Page 29 http://www.xiaoyu163.com 3 7 63 1515 0 16 PIN CORD DIAGRAM Green Black BL/WH Violet Blue Gray WH/BK White Yellow GN/BK VI/BK GY/BK 16 YL MEMORY 8 BK 7 RD 5 BL/WH REMOTE 4 WH L 13942296513 12 WH/BK 3 GN 11 GN/BK 2 VI 10 VI/BK...
  • Page 30 http://www.xiaoyu163.com 3 7 63 1515 0 L 13942296513 u163 VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY MOBILE ENTERTAINMENT CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan (No.MA056) Printed in Japan http://www.xiaoyu163.com...
  • Page 31 3 7 63 1515 0 SCHEMATIC DIAGRAMS CD RECEIVER KD-G255 CD-ROM No.SML200402 Area suffix U --------------------- Other Areas L 13942296513 Contents Block diagram Standard schematic diagrams Printed circuit boards 2-5 to 7 u163 No.MA056SCH COPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LTD.

  • Page 32: Precaution 2

    http://www.xiaoyu163.com 3 7 63 1515 0 Safety precaution Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system. Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.
  • Page 33 CH.R JBUS.SI LCD.DA KEY1 JBUS.SO LCD.CE KEY2 JBUS.IO REMOCON CD CHANGER REMOCON JBUS.INT ENC1 CONTROL IC801 JBUS.SCK ENC2 JVC BUS LCD1 ENC1 JBUS.SI ENC2 IC601 JS686 COM1 ENCODER COM2 LCD.CL DRIVER COM3 LCD.DA S1 to S52 LCD.CE w w w u 1 6 3 http://www.xiaoyu163.com...
  • Page 34 http://www.xiaoyu163.com Standard schematic diagrams 3 7 6 3 1 5 1 5 0 Main amplifier section QAU0311-001 QNB0190-001 4.7u R351 2.7K R352 CJ321 QNN0519-001 2.7K D331 R355 C351 Q351 100P 2.2K 2SD1781K/QR/-X 1SS355-X D341 R345 Q341 C341 2SD1781K/QR/-X 100P 2.2K 1SS355-X R341 R342...
  • Page 35 http://www.xiaoyu163.com 3 7 6 3 1 5 1 5 0 CD servo control section C570 C571 47/6.3 47/10 C543 0.012 C544 R558 D561 1A3G-T1 CD8V CD.RESET (SHEET 1) STATUS SUBQ SQCK IC561 TLOCK LA6242H-X FLOCK CD.SENSE R581 C582 KICK MDATA 4.7/25 IC521 MCLK...
  • Page 36 http://www.xiaoyu163.com LCD & Key control section 3 7 6 3 1 5 1 5 0 JS686 IC681 QSW0793-001 RPM7338-V4 C682 0.012 C681 R687 R688 4.7/6.3 C686 C687 0.022 0.022 CJ601 VMC0335-001 LCD1 ILL_10V ACC5V REMOCON ENC1 ENC2 To CN701 DIMMEROUT (SHEET 1) LCD.SCK LCD.SO...
  • Page 37 http://www.xiaoyu163.com 3 7 63 1515 0 Printed circuit boards Main board Forward side IC901 CJ321 C905 C901 L901 J801 CN901 C182 C904 C181 B301 B302 D901 C908 C311 C909 C916 C317 C919 C911 C915 C169 C166 C184 C310 C168 C167 C178 C176 C179...
  • Page 38 http://www.xiaoyu163.com 3 7 63 1515 0 Main board Reverse side C902 L901 C901 CJ321 D904 IC901 D905 C351 C341 R352 R342 C904 D901 J801 CN901 C913 R918 C907 C182 C181 D341 R911 C311 C317 C322 C908 C304 R912 R162 C361 R908 C162 R163...
  • Page 39 http://www.xiaoyu163.com 3 7 63 1515 0 Front board Forward side R626 D651 JS686 D636 S611 D649 R608 R607 R612 D637 R611 D648 R651 R652 S614 LCD1 D647 R605 R603 D644 D645 D638 D639 D646 D640 D641 D642 D643 S605 S604 S602 S601 S608...
  • Page 40 http://www.xiaoyu163.com 3 7 63 1515 0 L 13942296513 u163 VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY MOBILE ENTERTAINMENT CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan Printed in Japan (No.MA056SCH) http://www.xiaoyu163.com...
  • Page 41 3 7 63 1515 0 PARTS LIST [ KD-G255] * All printed circuit boards and its assemblies are not available as service parts. Area suffix U --------------------- Other Areas L 13942296513 - Contents - 3- 2 Exploded view of general assembly and parts list (Block No.M1) 3- 5 CD mechanism assembly and parts list (Block No.MB)
  • Page 42 http://www.xiaoyu163.com 3 7 63 1515 0 Exploded view of general assmbly and parts list Block No. L 13942296513 28 26 Front board u163 http://www.xiaoyu163.com...
  • Page 43 http://www.xiaoyu163.com 3 7 63 1515 0 Main board L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 44 http://www.xiaoyu163.com 3 7 63 1515 0 General assembly Block No. [M][1][M][M]  Symbol No. Part No. Part Name Description Local GE10043-210A TOP CHASSIS GE40135-001A EARTH PLATE GE30938-003A SIDE PANEL GE30393-002A BOTTOM COVER FSMA3004-203 INSULATOR QYSDST2604Z SCREW 2.6mm x 4mm(x3) FSKZ4005-001 SCREW (x2) QYSDST2606Z...
  • Page 45 http://www.xiaoyu163.com 3 7 63 1515 0 CD mechanism assembly and parts list Block No. Grease TN-2001-1011 TNG-87 GP-501MK CFD-005Z GP-501A L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 46 http://www.xiaoyu163.com 3 7 63 1515 0 CD mechanism Block No. [M][B][M][M]  Symbol No. Part No. Part Name Description Local 30320101T FRAME 30320102T TOP COVER 30320115T DANPER F 30320116T DANPER R 303205505T CHASSIS RIVET 303205503T CHANGE P. RVT A 303205301T CLAMPER ASS'Y 303205302T SPINDLE MOTOR A...
  • Page 47 http://www.xiaoyu163.com 3 7 63 1515 0 Electrical parts list Main board  Symbol No. Part No. Part Name Description Local Block No. [0][1][0][0] NCB31EK-153X C CAPACITOR 0.015uF 25V K  Symbol No. Part No. Part Name Description Local NCB31HK-472X C CAPACITOR 3300pF 50V K QEKJ1HM-105Z E CAPACITOR...
  • Page 48 http://www.xiaoyu163.com 3 7 63 1515 0  Symbol No.  Symbol No. Part No. Part Name Description Local Part No. Part Name Description Local C527 NCB31EK-104X C CAPACITOR 0.1uF 25V K NRSA63J-103X MG RESISTOR 10kΩ 1/16W J C528 NCB31EK-103X C CAPACITOR 0.01uF 25V K NRSA63J-222X MG RESISTOR...
  • Page 49 http://www.xiaoyu163.com 3 7 63 1515 0  Symbol No.  Symbol No. Part No. Part Name Description Local Part No. Part Name Description Local R554 NRSA02J-513X MG RESISTOR 51kΩ 1/10W J QQL244J-4R7Z INDUCTIOR 4.7uH J R557 NRS181J-332X MG RESISTOR 3.3kΩ 1/8W J L501 QQL244K-4R7Z COIL...
  • Page 50 http://www.xiaoyu163.com 3 7 63 1515 0  Symbol No. Part No. Part Name Description Local R611 NRSA63J-561X MG RESISTOR 560Ω 1/16W J R612 NRSA63J-681X MG RESISTOR 680Ω 1/16W J R613 NRSA63J-911X MG RESISTOR 910Ω 1/16W J R614 NRSA63J-122X MG RESISTOR 1.2kΩ...
  • Page 51 http://www.xiaoyu163.com 3 7 63 1515 0 <MEMO> L 13942296513 u163 3-11 http://www.xiaoyu163.com...
  • Page 52 http://www.xiaoyu163.com 3 7 63 1515 0 Packing materials and accessories parts list Block No. A2 A3 L 13942296513 KIT: A9 A10 u163 3-12 http://www.xiaoyu163.com...
  • Page 53 http://www.xiaoyu163.com 3 7 63 1515 0 Packing and accessories Block No. [M][3][M][M]  Symbol No. Part No. Part Name Description Local GET0196-001A INST BOOK CHI(TTAIWAN) THA ARA GET0196-002A INST BOOK GET0196-003A INSTALL MANUAL GET0196-004A INSTALL MANUAL GET0208-003A DEMO MODE SHEET VKZ4027-202 PLUG NUT VKH4871-001SS...