JVC KDSH-1000 Service manual

SERVICE MANUAL

CD RECEIVER

MA25520063

KD-SH1000J,KD-SH1000E,

KD-SH1000EX,KD-SH1000EY,

KD-SH1000EU,KD-SH1000U,

KD-SH1000UN,KD-SH1000UT,

KD-SH1000UH

Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)

TABLE OF CONTENTS

1 PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27

No.MA255

2006/3

SPECIFICATION

AUDIO AMPLIFIER SECTION

Power Output (for J) 20 W RMS × 4 Channels at 4 Ω and [< or =] 1% THD+N Signal to Noise Ratio(for J) 80 dBA (reference: 1 W into 4 Ω)

Maximum Power Output Front/Rear 50 W per channel

Continuous Power Output (RMS) Front/Rear 19 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than

0.8% total harmonic distortion

Load Impedance 4 Ω (4 Ω to 8 Ω allowance)

Equalizer Control Range Frequencies Graphic EQ 63 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, 8 kHz, 12.5

kHz (9 bands)

Parametric EQ 3 bands (Band 1/2/3): 20 Hz, 25 Hz, 31.5 Hz, 40 Hz, 50 Hz, 63 Hz,

80 Hz, 100 Hz, 125 Hz, 160 Hz, 200 Hz, 250 Hz, 315 Hz, 400 Hz, 500 Hz, 630 Hz, 800 Hz, 1 kHz, 1.2 kHz, 1.6 kHz, 2 kHz, 2.5 kHz,

3.2 kHz, 4 kHz, 5 kHz, 6.3 kHz, 8 kHz, 10 kHz, 12.5 kHz, 16 kHz, 20 kHz (31 frequencies)

Level ±10 dB

Frequency Response 40 Hz to 20 000 Hz

Level/Impedance Line-In 1.5 V/20 kΩ load (full scale)

Line-Out 5.0 V/20 kΩ load (full scale) Output Impedance 1 kΩ Subwoofer-Out Level/Impedance 2.0 V/20 kΩ load (full scale)

Other Terminals LINE IN, CD changer

TUNER SECTION

Frequency Range FM (for J) 87.5 MHz to 107.9 MHz (with channel interval set to 200 kHz)

87.5 MHz to 108.0 MHz (with channel interval set to 50 kHz)

FM 87.5 MHz to 108.0 MHz

AM (for J) 530 kHz to 1 710 kHz (with channel interval set to 10 kHz)

531 kHz to 1 602 kHz (with channel interval set to 9 kHz)

AM (for asia) 531 kHz to 1 602 kHz

AM (for europe) (MW) 522 kHz to 1 620 kHz

(LW) 144 kHz to 279 kHz

FM Tuner Usable Sensitivity 11.3 dBf (1.0 µV/75 Ω)

50 dB Quieting Sensitivity 16.3 dBf (1.8 µV/75 Ω)

Alternate Channel Selectivity (400 kHz) 65 dB

Frequency Response 40 Hz to 15 000 Hz

Stereo Separation 30 dB

AM Tuner Sensitivity/Selectivity 20 µV/65 dB MW Tuner (for europe) Sensitivity/Selectivity 20 µV/65 dB LW Tuner (for europe) Sensitivity 50 µV

1-2 (No.MA255)

CD PLAYER SECTION

Type Compact disc player

Signal Detection System Non-contact optical pickup (semiconductor laser)

Number of Channels 2 channels (stereo)

Frequency Response 5 Hz to 20 000 Hz

Dynamic Range 98 dB

Signal-to-Noise Ratio 102 dB

Wow and Flutter Less than measurable limit

MP3 Bit Rate 32 kbps - 320 kbps

Sampling Frequency MPEG-1: 48 kHz, 44.1 kHz, 33 kHz

MPEG-2: 24 kHz, 22.05 kHz, 16 kHz

WMA Bit Rate 8 kbps - 320 kbps

Sampling Frequency 48 kHz, 44.1 kHz, 32 kHz

SD CARD

Format FAT 12/16

Storage 8 MB - 512 MB

Playable Audio Format MP3/WMA

MP3 Bit Rate 8 kbps - 320 kbps

Sampling Frequency MPEG-1: 48 kHz, 44.1 kHz, 33 kHz

WMA Bit Rate MPEG-2: 24 kHz, 22.05 kHz, 16 kHz

Sampling Frequency 8 kbps - 192 kbps

48 kHz, 44.1 kHz, 32 kHz

USB MEMORY

Format FAT 12/16/32

Storage Less than 4 GB (1 partition type)

Playable Audio Format MP3/WMA

Max. Current Less than 500 mA

MP3 Bit Rate 32 kbps - 320 kbps

Sampling Frequency MPEG-1: 48 kHz, 44.1 kHz, 32 kHz

MPEG-2: 24 kHz, 22.05 kHz, 16 kHz MPEG-2.5: 12 kHz, 11.025 kHz, 8 kHz

WMA Bit Rate 5 kbps - 320 kbps

Sampling Frequency 8 kHz - 48 kHz

GENERAL

Power Requirement DC 14.4 V (11 V to 16 V allowance)

Grounding System Negative ground

Allowable Operating Temperature 0°C to +40°C (32°F to 104°F) Dimensions (W × H × D) Installation Size (approx.) 182 mm × 52 mm × 162 mm (7-3/16" × 2-1/16" × 6-7/16")

Panel Size (approx.) 188 mm × 58 mm × 11 mm (7-7/16" × 2-5/16" × 7/16")

Mass (approx.) 1.7 kg (3.8 lbs) (excluding accessories)

Design and specifications are subject to change without notice.

(No.MA255)1-3

1.1 Safety Precautions

SECTION 1

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.

1-4 (No.MA255)

1.2 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 laser products. Be careful to use proper grounding in the area where repairs are being performed.

(1) Ground the workbench

Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it.

(2) Ground yourself

Use an anti-static wrist strap to release any static electricity built up in your body.

(caption) Anti-static wrist strap

Conductive material (conductive sheet) or iron plate

(3) Handling the optical pickup

• In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.)

• Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily destroy the laser diode.

1.3 Handling the traverse unit (optical pickup)

(1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit. (2) Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the

replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a

time when attaching it to the connector. (3) Handle the flexible cable carefully as it may break when subjected to strong force. (4) It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.

1.4 Attention when traverse unit is decomposed

*Please refer to "Disassembly method" in the text for the pickup unit.

• Apply solder to the short land before the flexible wire is disconnected from the connector on the pickup unit. (If the flexible wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)

• In the assembly, be sure to remove solder from the short land after connecting the flexible wire.

Short sections

Flexible wire

CN601

Mechanism control board

(No.MA255)1-5

1.5 Important for laser products

1.CLASS 1 LASER PRODUCT

2.DANGER : Invisible laser radiation when open and inter

lock failed or defeated. Avoid direct exposure to beam.

3.CAUTION : There are no serviceable parts inside the

Laser Unit. Do not disassemble the Laser Unit. Replace

the complete Laser Unit if it malfunctions.

4.CAUTION : The CD,MD and DVD player uses invisible

laser radiation and is equipped with safety switches which

prevent emission of radiation when the drawer is open and

the safety interlocks have failed or are defeated. It is

dangerous to defeat the safety switches.

5.CAUTION : If safety switches malfunction, the laser is able

to function.

6.CAUTION : Use of controls, adjustments or performance of

procedures other than those specified here in may result in

hazardous radiation exposure.

Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.

REPRODUCTION AND POSITION OF LABELS

WARNING LABEL

CAUTION : Visible and Invisible

CLASS 1 LASER PRODUCT

laser radiation when open and interlock failed or defeated. AVOID DIRECT EXPOSURE TO BEAM. (e)

ADVARSEL : Synlig og usynlig laserstråling når maskinen er åben eller interlocken fejeler. Undgå direkte eksponering til stråling. (d)

VARNING : Synlig och osynling laserstrålning när den öppnas och spärren är urkopplad. Betrakta ej strålen. (s)

VARO : Avattaessa ja suojalukitus ohitettuna tai viallisena olet alttiina näkyvälle ja näkymättömälle lasersäteilylle. Vältä säteen kohdistumista suoraan itseesi. (f)

1-6 (No.MA255)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MA255)1-7

SECTION 3

DISASSEMBLY

3.1 Main body section

3.1.1 Removing the front panel assembly (See Fig.1)

(1) Push the detach button in the lower right part of the front

panel assembly.

(2) Remove the front panel assembly.

3.1.2 Removing the heat sink (See Fig.2)

Reference:

Remove the front panel assembly as required.

(1) From the left side of the main body, remove the two screws

A and two screws B attaching the heat sink.

(2) Remove the heat sink from the main body.

Front panel assembly

Detach button

Fig.1

AAB

Heat sink

Fig.2

1-8 (No.MA255)

3.1.3 Removing the top chassis assembly

(See Fig.3 to 6)

• Prior to performing the following procedures, remove the heat

sink.

Reference:

Remove the front panel assembly as required. (1) From the bottom side of the main body, remove the two

screws C attaching the top chassis assembly to the bottom chassis assembly. (See Fig.3)

(2) Remove the two screws E attaching the IC heat sink from

left side of the main body. (See Fig.5)

(3) From the both and rear sides of the main body, remove the

four screws D attaching the top chassis assembly to the bottom chassis assembly. (See Fig.4 to 6)

(4) Lift the top chassis assembly in the direction of the arrow,

disconnect the connector CN503 trol board from the connector CN721 (See Fig.4 to 6)

(5) Take out the top chassis assembly from the bottom chassis

assembly.

on the mechanism con-

on the main board.

Top chassis assembly

CN503

Bottom chassis assembly

Top chassis assembly

Fig.3

Mechanism control board

Main board

Bottom chassis assembly

Mechanism control board

Top chassis assembly

Main board

Bottom chassis assembly

CN721

Fig.4

Fig.5

IC heat sink

Top chassis assembly

Bottom chassis assembly

Rear bracket

Fig.6

(No.MA255)1-9

3.1.4 Removing the front chassis assembly (See Fig 7, 8)

• Prior performing the following procedure, remove the front

panel assembly, heat sink and top chassis assembly. (1) From the both sides of the top chassis assembly, remove

the two screws F attaching the front chassis assembly.

(2) Remove the front chassis assembly from the top chassis

assembly.

3.1.5 Removing the CD mechanism assembly (See Fig.9)

• Prior performing the following procedures, remove the front

panel assembly, heat sink and top chassis assembly.

Reference:

Remove the front chassis assembly as required.

(1) From the inside of the top chassis assembly, remove the

three screws G attaching the CD mechanism assembly.

(2) Release the mecha heat sink from the slots a on the mech-

anism control board and remove the mecha heat sink from the main body.

(3) Take out the CD mechanism assembly from the top chas-

sis.

Top chassis assembly

Front chassis assembly

Mecha heat sink

Top chassis

Front chassis assembly

Fig.7

Top chassis assembly

Fig.8

Mechanism control board

1-10 (No.MA255)

G G

CD mechanism assembly

Fig.9

3.1.6 Removing the main board

(See Fig.10, 11)

• Prior to performing the following procedures, remove the front

panel assembly, heat sink and top chassis assembly. (1) From the rear side of the bottom chassis assembly, remove

the two screws H attaching the rear bracket to the bottom chassis assembly. (See Fig.10)

(2) From the top side of the bottom chassis assembly, remove

the tow screws J attaching the main board to the bottom chassis assembly. (See Fig.11)

(3) Release the stopper of the connector CN701

board in an upward direction, disconnect the card wire from the connector CN701

(4) Disconnect the wire from the connector CN962 on the main

board. (See Fig.11)

(5) Disconnect the wire from connector CN961

board. (See Fig.11)

Reference:

After connecting the wires, fix the wires with the wire holders.

(6) Take out the main board from the bottom chassis assem-

bly.

. (See Fig.11)

on the main

Rear bracket

Front door mechanism assembly

Card wire

CN962

Bottom chassis assembly

Fig.10

Bottom chassis assembly

CN701

Stopper

3.1.7 Removing the rear bracket

(See Fig.12)

• Prior to performing the following procedures, remove the front

panel assembly, heat sink, top chassis assembly and main board. (1) Remove the one screw K (European version is two screws)

and two screws L attaching the wires to the rear bracket.

(2) Remove the two screws M attaching the wire bracket to the

rear bracket.

(3) From the rear side of the main board, remove the wires

from the rear bracket in the direction of the arrow.

Reference:

After attaching the rear bracket to the main board, pass the wires through the wire bracket and insert them into the slots of the rear bracket.

CN961 Main board

Fig.11

Rear bracket

K K

(only europian version)

Fig.12

(No.MA255)1-11

3.1.8 Removing the front door mechanism assembly (See Fig.13)

• Prior to perform the following procedures, remove the front

panel assembly, heat sink, top chassis assembly and main board. (1) From the top side of the bottom chassis assembly, remove

the one screw N attaching the FPC guide to the bottom chassis.

(2) Remove the five screws P attaching the front door mecha-

nism assembly to the bottom chassis.

Reference:

When attaching the screws N and P, apply a locking agent them.

(3) Take out the front door mechanism assembly from the bot-

tom chassis.

Front door mechanism assembly

Bottom chassis

3.1.9 Removing the switch board (See Fig.14 to 16)

• Prior to performing the following procedures, remove the front

panel assembly.

(1) From the rear side of the front panel assembly, remove the

five screws Q attaching the rear cover to the front panel assembly, (See Fig.14)

(2) Release the nine joints b of the front panel assembly and

remove the rear cover. (See Fig.15)

(3) Take out the switch board from the font panel assembly.

(See Fig.16)

Note:

When removing the rear cover assembly and switch board, be careful not to lose the spring.

FPC guide

Joints b Joints b

Rear cover assembly

Fig.13

Fig.14

1-12 (No.MA255)

Spring

Joints b

Fig.15

Front panel assembly

Fig.16

Switch board

3.2 CD mechanism assembly section

• Remove the CD mechanism assembly from the main body.

(See "3.1.5 Removing the CD mechanism assembly".)

3.2.1 Removing the mechanism control board

(See Fig.1)

(1) From the bottom side of the CD mechanism assembly, sol-

der the short sections on the flexible wire.

Caution:

Solder the short sections on the flexible wire before disconnecting the flexible wire from the connector CN601 on the mechanism control board. If you do not follow this instruction, the CD pickup may be damaged.

(2) Disconnect the flexible wire from the connector CN601

the mechanism control board.

(3) Disconnect the flexible wire from the connector CN602

the mechanism control board.

(4) Remove the solders from the soldered sections a on the

mechanism control board and remove the wires of the feed motor.

(5) Remove the solders from the soldered sections b on the

mechanism control board, and remove each wire of the spindle motor and other parts.

(6) Remove the five screws A attaching the mechanism con-

trol board.

Caution:

When reassembling, remove the solders from the short sections after connecting the flexible wire to the connector CN601 on the mechanism control board.

Short sections

Flexible wire

CN601

CD mechanism assembly

Spindle motor

Mechanism control board

Fig.1

Feed motor

CN602

(No.MA255)1-13

3.2.2 Removing the top cover

(See Fig.2)

(1) From the back side of the CD mechanism assembly, re-

move the two screws B attaching the top cover.

(2) Take out the top cover in an upward direction.

Reference:

When attaching the top cover, set the sections c of the top cover under the bending sections d of the chassis base 2.

3.2.3 Removing the mechanism section (See Figs.2 to 4)

• Remove the mechanism control board and top cover.

(1) From the front side of the CD mechanism assembly, re-

move the two screws C attaching the right and left stoppers. (See Fig.2.)

(2) Remove the two floating springs on the bottom side of the

CD mechanism assembly. (See Fig.3.)

(3) Take out the mechanism section in an upward direction

and remove the three damper springs from the dampers. (See Fig.4.)

Caution:

• When reassembling the mechanism section, reattach the damper springs to the dampers respectively and insert the three shafts on the bottom of the mechanism section to the dampers. (See Fig.4.)

• Before inserting the shaft to the dampers, apply IPA to the hole of damper.

Top cover

Damper spring(F) (Green)

Floating spring

Fig.3

Mechanism section

Damper spring(R) (Red)

Dampe (Yellow)

Stopper

Fig.2

Chassis base 2

Damper (Black)

Damper spring(F) (Green)

Damper (Black)

Fig.4

1-14 (No.MA255)

3.2.4 Removing the clamper unit (See Figs.5 and 6)

• Remove the mechanism control board, top cover and mecha-

nism section. (1) From the bottom side of the mechanism section, remove

the clamper 2 spring. (See Fig.5.)

(2) Release section e of the clamper spring from the bending

section of the CD chassis assembly. (See Fig.6.)

(3) Move the clamper unit 2 in the direction of the arrow and

release the joints (f, g). (See Fig.5.)

(4) Take out the clamper unit 2 in an upward direction. (See

Fig.5.)

3.2.5 Reattaching the clamper unit (See Figs.5 to 9)

(1) From the bottom side of the mechanism section, attach the

clamper spring to the clamper unit 2. (See Figs.5 and 9.)

(2) Move the clamper unit 2 to set the joints (f, g) to each pro-

jection of the CD chassis assembly. (See Fig.5.)

(3) Make sure that section h of the clamper unit 2 is inserted to

the notch of the CD chassis assembly. (See Figs.5 and 8.)

(4) Move the clamper spring to the outside of the bending part

of the CD chassis assembly. (See Fig.6.)

Caution:

When reattaching the clamper unit 2, temporarily hook the end of the clamper spring as shown in the figure to make the work easy. (See Fig.9.)

(5) Attach the clamper 2 spring to the CD chassis assembly

and clamper unit 2. (See Figs.5 and 7.)

Clamper spring

Clamper 2 spring

CD chassis assembly

Clamper unit 2

Fig.5

Clamper spring

CD chassis assembly

Fig.6

(No.MA255)1-15

Clamper 2 spring

Clamper unit 2

CD chassis assembly

Fig.7

Clamper unit 2

Notch

Fig.8

1-16 (No.MA255)

Clamper spring

Fig.9

3.2.6 Removing the front unit (See Figs10 to 12)

• Remove the mechanism control board, top cover and mecha-

nism section. (1) From the bottom side of the mechanism section, remove

the double-stick tape fixing the flexible wire. (See Fig.10.)

(2) From the top side of the mechanism section, remove the

screw D attaching the front unit 2. (See Figs.11 and 12.)

(3) Move the front unit 2 toward the front to release the joint i.

(See Figs.11 and 12.)

(4) Release two joints j and k on the right side of the CD chas-

sis assembly. (See Fig.12.) (5) Take out the front unit 2 in an upward direction. (6) Remove the double-stick tape fixing the flexible wire and

remove the two screws E attaching the switch wire. (See

Fig.12.)

Reference:

You can remove the switch wire only without removing the front unit 2.

Double-stick tape

Front unit 2

Flexible wire

Fig.10

Double-stick tape

Flexible wire

Fig.11

Switch wire

Front unit 2

CD chassis assembly

Fig.12

(No.MA255)1-17

3.2.7 Removing the loading arm assembly (See Figs.13 and 14)

• Remove the mechanism control board, top cover, mechanism

section and front unit 2. (1) From top side of the mechanism section, move the loading

arm assembly in the direction of the arrow. (See Fig.13.)

(2) Release the projections from the right and left joints (m, n)

of the CD chassis assembly. (See Figs.13 and 14.)

(3) Release the projection from notch p of the connect arm on

the right side of the mechanism section and release the projection from notch q of the slide cam assembly on the left side. (See Figs.13 and 14.)

Loading arm assembly

CD chassis assembly

Fig.13

Loading arm assembly

Side cam assembly

CD chassis assembly

Fig.14

Connect arm

1-18 (No.MA255)

3.2.8 Removing the rod (L), rod (R) and roller assembly

(See Figs.15 and 16)

• Remove the mechanism control board, top cover, mechanism

section, front unit and loading arm assembly. (1) From the bottom side of the loading arm assembly, release

the rod (L) and (R) from the joints r. (See Fig.15.)

(2) Remove the roller assembly from the loading arm assem-

bly. (See Fig.16.)

(3) Remove the two collars and washer from the roller assem-

bly. (See Fig.16.)

Caution:

After attaching the roller assembly to the loading arm assembly, attach the rod (L) and (R). Then attach the rods to the right and left collars of the roller assembly. (See Fig.15.)

Collar

Rod(R) Rod(L)

Rod(R)

Roller assembly

Loading arm assembly

Collar

Rod(L)

Fig.15

Collar

Rod(L)

Washer

Roller assembly

Rod(R)

Collar

Loading arm assembly

Fig.16

(No.MA255)1-19

3.2.9 Removing the CD pickup (See Figs.17 to 19)

• Remove the mechanism control board.

(1) From the bottom side of the CD mechanism assembly, turn

the feed gear in the direction of the arrow to move the CD pickup assembly outwards. (See Fig.17.)

(2) Remove the screw F and remove the thrust spring. (See

Fig.17.)

(3) Remove the CD pickup assembly in an upward direction

from the side of L.S. gear and release the CD pickup assembly from joint s of the sub guide. (See Fig.18.)

(4) Move the lead screw of the CD pickup assembly in the di-

rection of the arrow to release at joint t. (See Fig.18.)

(5) Remove the screw G attaching the CD rack spring and CD

rack plate on the CD pickup assembly. (See Fig.19.)

(6) Pull out the lead screw. (See Fig.19.)

Caution:

• When attaching the CD pickup assembly, attach the CD pickup assembly at joint s of sub guide first, and attach the lead screw to the joint t on the L.S.holder 2. (See Fig.18.)

• Perform electric adjustment after replacing the pickup.

CD mechanism assembly

CD pickup assembly

Thrust spring

L.S.holder 2

Fig.17

Lead screw

Feed gear

CD Pickup assembly

Sub guide

CD rack spring

CD rack plate

L.S. Gear

Fig.18

Lead screw

1-20 (No.MA255)

CD Pickup

Fig.19

3.2.10 Removing the spindle motor

(See Fig.20)

• Remove the mechanism control board, top cover, mechanism section and clamper unit. (1) From the top side of the mechanism section, remove the

T.table assembly and washer from the spindle motor. (2) Remove the two screws H attaching the spindle motor. (3) Take out the spindle motor from the bottom side of the

mechanism section.

Caution:

Perform adjustment when reattaching the spindle motor.

3.2.11 Removing the feed motor (See Figs.21 and 22)

• Remove the mechanism control board.

(1) From the bottom side of the CD mechanism assembly, re-

move the feed TRI. spring. (See Fig.21.)

(2) Remove the two screws J attaching the feed motor assem-

bly. (See Fig.21.)

(3) Remove the slit washer from the motor H. assembly and

pull out the worm wheel. (See Fig.22.)

(4) Remove the two screws K attaching the feed motor. (See

Fig.22.)

T. table assembly

Washer

Spindle moto

Fig.20

Feed TRI. spring

Feed motor assembly

Fig.21

Slit washer

Worm wheel

Feed moto

Motor H. assembly

Fig.22

(No.MA255)1-21

3.2.12 Removing the SW board and rest SW board (See Fig.23)

• Remove the mechanism control board.

(1) From the bottom side of the CD mechanism assembly, re-

move the screw L attaching the SW board.

(2) Remove the screw M attaching the rest SW board.

CD mechanism assembly

Rest SW boardSW board

Fig.23

1-22 (No.MA255)

SECTION 4

ADJUSTMENT

4.1 Adjustment method

 Test instruments required for adjustment

(1) Digital oscilloscope (100MHz) (2) Electric voltmeter (3) Digital tester (4) Tracking offset meter (5) Test Disc JVC :CTS-1000 (6) Extension cable for check

EXTDV001-20P × 1

 Standard volume position

Balance and Bass &Treble volume : lndication"0" Loudness : OFF

 How to connect the extension cable for adjusting

Caution:

Be sure to attach the heat sink and rear bracket onto the power amplifier IC and regulator IC respectively, before supply the power. If voltage is applied without attaching these parts, the power amplifier IC and regulator IC will be destroyed by heat.

 Standard measuring conditions

Power supply voltage DC14.4V(11 to 16V)

Load impedance 20KΩ(2 Speakers connection)

Output Level Line out 2.5V (Vol. MAX)

 Dummy load

Exclusive dummy load should be used for AM,and FM. For FM dummy load,there is a loss of 6dB between SSG output and antenna input.The loss of 6dB need not be considered since direct reading of figures are applied in this working standard.

Extension cable

EXTDV001-20P

(No.MA255)1-23

4.2 Service mode

4.2.1 Service mode setting

(1) Push POWER button (Power ON) (2) Set to service mode By pushing and holding "DISP" button and "BAND" button sequentially. (3) Select the menu with " " or " " button and decide it with "ENTER" button. (4) When the "BACK" button is pushed, it returns to the former menu.

BAND

DISP

Service mode (MENU)

Service Mode Running Mode Data Clear ROM Correction DSP Tuner S Mode DSP Tuner Adjust

POWER

ENTER

Service mode

T***-T***-** M R*** RC V*** CD V*** CH V***

Ver USB V*** IPOD V***

Error Read

OK: Function

BACK

CD Error Read CH Erroe Read Panel Error Read A.DSP Error Read T.DSP Error Read

CD Error Read CH Error Read PANEL Error Read

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A.DSP Error Read T.DSP Error Read

Retry Total *** Retry NG Total ***

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