Jvc KD-BT-11 Service Manual

SERVICE MANUAL

CD RECEIVER

MA387<Rev.003>20089SERVICE MANUAL

KD-BT11J, KD-BT11E, KD-BT11EX,

KD-BT11EY, KD-BT11EU, KD-BT11EE,

KD-BT11U, KD-BT11UT, KD-BT19UR,

KD-BT12E, KD-BT12EX

for J/U/UT/UR

for

E/EX/EY/EU/EE

COPYRIGHT © 2008 Victor Company of Japan, Limited

Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
Lead free solder used in the board (material : Sn-Cu, melting point : 230 Centigrade)

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26

for EE

for J/UR

COPYRIGHT © 2008 Victor Company of Japan, Limited

No.MA387<Rev.003>

2008/9

SPECIFICATION

J / UR

AUDIO AMPLIFIER SECTION

Power Output 20 W RMS × 4 Channels at 4 Ω and < or = 1% THD+N
Signal-to-Noise Ratio 80 dBA (reference: 1 W into 4 Ω)
Load Impedance 4 Ω (4 Ω to 8 Ω allowance)
Tone Control Range Bass ±12 dB (60 Hz, 80 Hz, 100 Hz, 200 Hz)

Mid-range ±12 dB (500 Hz, 1.0 kHz, 1.5 kHz, 2.5 kHz)
Treble ±12 dB (10.0 kHz 12.5 kHz 15.0 kHz 17.5 kHz)
Q Bass: Q1.0, Q1.25, Q 1.5, Q2.0

Mid-range: Q0.5, Q0.75, Q1.0, Q1.25
Frequency Response 40 Hz to 20 000 Hz
Line-Out Level/Impedance 2.5 V/20 kΩ load (full scale)
Subwoofer-Out Level/Impedance 2.5 V /20 kΩ load (full scale)
Output Impedance 1 kΩ
Other Terminal CD changer jack AUX (auxiliary) input jack Antenna input

TUNER SECTION

Frequency Range FM

AM with channel interval set to 10 kHz: 530 kHz to 1 710 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)
Frequency Response 40 Hz to 15 000 Hz
Stereo Separation 35 dB

AM Tuner Sensitivity 20 µV

Selectivity 35 dB

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 96 dB
Signal-to-Noise Ratio 98 dB
Wow and Flutter Less than measurable limit
MP3 Decoding Format (MPEG1/2 Audio Layer 3) Max. Bit Rate: 320 kbps
WMA (Windows Media® Audio) Decoding Format Max. Bit Rate: 192 kbps

Version Bluetooth 1.2 certified
Power Class Class 2 Radio (possible distance 10 m)
Service Area 10 m
Profile HFP 1.5, OPP 1.1, A2DP 1.2, AVRCP 1.3

Power Requirement Operating Voltage 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)

(approx.)
Mass 1.3 kg (2.9 lbs) (excluding accessories)

Design and specifications are subject to change without notice.

Installation Size
Panel Size 188 mm × 58 mm × 6 mm (7-7/16” × 2-5/16” × 1/4”)

with channel inter val set to 100 k Hz or 200 kH z: 87.5 MH z to 107.9 MH z

with channel interval set to 50 kHz: 87.5 MHz to 108.0 MHz

with channel interval set to 9 kHz: 531 kHz to 1 602 kHz

65 dB

BLUETOOTH

GENERAL

182 mm × 52 mm × 160 mm (7-3/16” × 2-1/16” × 6-5/16”)

1-2 (No.MA387<Rev.003>)

E/EX/EY/EU

AUDIO AMPLIFIER SECTION

Maximum Power Output Front/Rear 50 W per channel
Continuous Power Output

(RMS)
Load Impedance 4 Ω (4 Ω to 8 Ω allowance)
Tone Control Range Bass ±12 dB (60 Hz, 80 Hz, 100 Hz, 200 Hz)

Frequency Response 40 Hz to 20 000 Hz
Signal-to-Noise Ratio 80 dB
Line-Out/Subwoofer-O ut Level/Impedance 2.5 V /20 kΩ load (full scale)
Output Impedance 1 kΩ
Other Terminal

Frequency Range FM 87.5 MHz to 108.0 MHz

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

MW Tuner Sensitivity/Selectivity 20 µV/35 dB
LW Tuner Sensitivity 50 µV

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 96 dB
Signal-to-Noise Ratio 98 dB
Wow and Flutter Less than measurable limit
MP3 Decoding Format (MPEG1/2 Audio Layer 3) Max. Bit Rate: 320 kbps
WMA (Windows Media® Audio) Decoding Format Max. Bit Rate: 192 kbps

Version Bluetooth 1.2 certified
Power Class Class 2 Radio (possible distance 10 m)
Service Area 10 m
Profile HFP 1.5, OPP 1.1, A2DP 1.2, AVRCP 1.3

Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negat ive ground
Allowable Operating Temperature 0°C to +40°C
Dimensions (W × H × D)

(approx.)
Mass 1.3 kg (excluding accessor ies)

Design and specifications are subject to change without notice.

Front/Rear 19 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than 0.8%

total harmonic distortion.

Mid-range ±12 dB (500 Hz, 1.0 kHz, 1.5 kHz, 2.5 kHz)
Treble ±12 dB (10.0 kHz 12.5 kHz 15.0 kHz 17.5 kHz)
Q Bass: Q1.0, Q1.25, Q 1.5, Q2.0

Mid-range: Q0.5, Q0.75, Q1.0, Q1.25

CD changer jack Steering wheel remote input AUX (auxiliary) input jack Aerial input

TUNER SECTION

AM MW: 522 kHz to 1 620 kHz

LW: 144 kHz to 279 kHz

50 dB Quieting Sensitivity 16.3 dBf (1.8 µV/75 Ω)
Alternate Channel Sel ectivity (400 kHz )
Frequency Response 40 Hz to 15 000 Hz
Stereo Separation 30 dB

Installation Size 182 mm × 52 mm × 160 mm
Panel Size 188 mm × 58 mm × 13 mm

65 dB

CD PLAYER SECTION

BLUETOOTH

GENERAL

(No.MA387<Rev.003>)1-3

EE

AUDIO AMPLIFIER SECTION

Maximum Power Ou tput Front/Rear 50 W per channel
Continuous Power Output

(RMS)
Load Impedance 4 Ω (4 Ω to 8 Ω allowance)
Tone Control Range Bass ±12 dB (60 Hz, 80 Hz, 100 Hz, 200 Hz)

Frequency Response 40 Hz to 20 000 Hz
Signal-to-Noise Ratio 80 dB
Line-Out/Subwoofer-Out Level/Impedance 2.5 V /20 kΩ load (full scale)
Output Impedance 1 kΩ
Other Terminal AUX (auxiliary) input jack, Aerial input

Frequency Range FM1/FM2 87.5 MHz to 108.0 MHz

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

MW Tuner Sensitivity/Selectivity 20 µV/35 dB
LW Tuner Sensitivity: 50 µV

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 96 dB
Signal-to-Noise Ratio 98 dB
Wow and Flutter Less than measurable limit
MP3 Decoding Format (MPEG1/2 Audio Layer 3) Max. Bit Rate: 320 kbps
WMA (Windows Media® Audio) Decoding Format Max. Bit Rate: 192 kbps

Version Bluetooth 1.2 certified
Power Class Class 2 Radio (possible distance 10 m)
Service Area 10 m
Profile HFP 1.5, OPP 1.1, A2DP 1.2, AVRCP 1.3

Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Operating Temperature 0°C to +40°C
Dimensions (W × H × D)

(approx.)
Mass 1.3 kg (exclu ding accessories)

Design and specifications are subject to change without notice.

Front/Rear 19 W per channel into 4 Ω, 40 Hz to 20 000 H z at no more than 0.8%

total harmonic distortion.

Mid-range ±12 dB (500 Hz, 1.0 kHz, 1.5 kHz, 2.5 kHz)
Treble ±12 dB (10.0 kHz 12.5 kHz 15 .0 kHz 17.5 kHz)
Q Bass: Q1.0, Q1.25, Q 1.5, Q2.0

Mid-range: Q0.5, Q0.75, Q1.0, Q1.25

TUNER SECTION

FM3 65.00 MHz to 74.00 MHZ
AM MW: 522 kHz to 1 620 kHz

LW: 144 kHz to 279 kHz

50 dB Quieting Sensitivity 16.3 dBf (1.8 µV/75 Ω)
Alternate Channe l Selec tivity (40 0 kHz )
Frequency Response 40 Hz to 15 000 Hz
Stereo Separation 30 dB

CD PLAYER SECTION

Installation Size 182 mm × 52 mm × 160 mm
Panel Size 188 mm × 58 mm × 13 mm

65 dB

BLUETOOTH

GENERAL

1-4 (No.MA387<Rev.003>)

U/UT

AUDIO AMPLIFIER SECTION

Maximum Power Output Front/Rear 50 W per channel
Continuous Power Output

(RMS)
Load Impedance 4 Ω (4 Ω to 8 Ω allowance)
Tone Control Range Bass ±12 dB (60 Hz, 80 Hz, 100 Hz, 200 Hz)

Frequency Response 40 Hz to 20 000 Hz
Signal-to-Noise Ratio 80 dB
Line-Out Level/Impedance 2.5 V/20 kΩ load (full scale)
Subwoofer-Out Level/Impedance 2.5 V /20 kΩ load (full scale)
Output Impedance 1 kΩ
Other Terminal CD changer jack AUX (auxiliary) input jack Antenna input

Frequency Range FM 87.5 MHz to 108.0 MHz

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

AM Tuner Sensitivity 20 µV

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 96 dB
Signal-to-Noise Ratio 98 dB
Wow and Flutter Less than measurable limit
MP3 Decoding Format (MPEG1/2 Audio Layer 3) Max. Bit Rate: 320 kbps
WMA (Windows Media® Audio) Decoding Format Max. Bit Rate: 192 kbps

Version Bluetooth 1.2 certified
Power Class Class 2 Radio (possible distance 10 m)
Service Area 10 m
Profile HFP 1.5, OPP 1.1, A2DP 1.2, AVRCP 1.3

Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative groun d
Allowable Operating Temperature 0°C to +40°C
Dimensions (W × H × D)

(approx.)
Mass 1.3 kg (excluding accessories)

Design and specifications are subject to change without notice.

Front/Rear 19 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than 0.8%

total harmonic distortion.

Mid-range ±12 dB (500 Hz, 1.0 kHz, 1.5 kHz, 2.5 kHz)
Treble ±12 dB (10.0 kHz 12.5 kHz 15.0 kHz 17.5 kHz)
Q Bass: Q1.0, Q1.25, Q 1.5, Q2.0

Mid-range: Q0.5, Q0.75, Q1.0, Q1.25

TUNER SECTION

AM 531 kHz to 1 602 kHz

50 dB Quieting Sensitivity 16.3 dBf (1.8 µV/75 Ω)
Alternate Channel Selectivity (400 kHz)
Frequency Response 40 Hz to 15 000 Hz
Stereo Separation 35 dB

Selectivity 35 dB

CD PLAYER SECTION

Installation Size 182 mm × 52 mm × 160 mm
Panel Size 188 mm × 58 mm × 6 mm

65 dB

BLUETOOTH

GENERAL

(No.MA387<Rev.003>)1-5

1.1 Safety Precautions

SECTION 1

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.

1-6 (No.MA387<Rev.003>)

1.2 Preventing static electricity

Electrostatic discharge (ESD), w hi ch occurs w hen sta tic ele ct ricit y sto red i n the bod y, fa bric , etc. is discharged, ca n de stroy 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

1M

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 che ck the con dition of th e laser dio de in the opt ical pick up. The tes ter's internal power so urce can ea sily
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 nip pers, etc. afte r replacing th e optical pi ckup. For speci fic details, refe r to the

replacement procedure in th e t ext . R em ove the anti-static pin w he n re pla cing the traverse unit. Be c arefu l not to tak e to o l on g 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 card wire is disconnected from the connector on the pickup unit.
(If the card 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 card wire.

Pickup

Wires

Push switch

Base board

Frame

Flexible wire

Connector

CD mechanism
assembly

Pickup

(No.MA387<Rev.003>)1-7

1.5 Important for laser products

1.CLASS 1 LASER PRODUCT

2.CAUTION :

(For U.S.A.) Visible and/or invisible class II laser radiation
when open. Do not stare into beam.
(Others) Visible and/or invisible class 1M laser radiation
when open. Do not view directly with optical instruments.

3.CAUTION : Visible and/or invisible laser radiation when
open and inter lock failed or defeated. Avoid direct
exposure to beam.

4.CAUTION : This laser product uses visible and/or 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 and PRINT

WARNING LABEL and PRINT

1-8 (No.MA387<Rev.003>)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

SECTION 3

DISASSEMBLY

3.1 Main body

3.1.1 Removing the FRONT CHASSIS assembly (See Fig.1)

(1) Disengage the four hooks a engaged the both side of the

FRONT CHASSIS assembly.

hook

a

Fig.1

3.1.2 Removing the HEAT SINK (See Fig.2, 3)

(1) Remove the three screws A and the two screws B attaching

the HEAT SINK. (See Fig.2)

(2) Remove the two screws C and the one screw D attaching

the HEAT SINK. (See Fig.3)

A

B

Fig.2

D

C

Fig.3

(No.MA387<Rev.003>)1-9

3.1.3 Removing the BOTTOM COVER (See Fig.4)

(1) Remove the one screw E attaching the BOTTOM COVER.
(2) Slide the BOTTOM COVER to backward.

3.1.4 Removing the MAIN BOARD assembly (See Fig.5, 6)

(1) Remove the two screws F and the one screw G attaching

the MAIN BOARD assembly. (See Fig.5)

(2) Remove the two screws H attaching the MAIN BOARD assembly.

(See Fig.6)

(3) Disconnect the connector CN501

BOARD assembly and CD MECHANISM assembly. (Se e
Fig.6)

connected to MAIN

E

Fig.4

FG

Fig.5

CN501

1-10 (No.MA387<Rev.003>)

H

Fig.6

3.1.5 Removing the CD MECHANISM assembly (See Fig.7)

(1) Remove the three screws J attaching the CD MECHANISM

assembly.

3.1.6 Removing the SWITCH BOARD assembly (See Fig.8)

(1) Remove the VOLUME KNOB.
(2) Remove the four screws K attaching the REAR COVER.
(3) Disengage the nine hooks b engage d the REAR COVER.

Fig.7

hook

J

J

b

K

Fig.8

hook

K

b

(No.MA387<Rev.003>)1-11

3.2 CD mechanism assembly

A

3.2.1 Removing the top cover
(See Figs.1 and 2)

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

move the four screws A attaching the top cover. (See
Fig.1.)

(2) Lift the front side of the top cover and move the top cover

backward to release the two joints a. (See Figs.1 and 2.)

Top cover

A

a

A

A

Fig.1

a

Top cover

Fig.2

1-12 (No.MA387<Rev.003>)

3.2.2 Removing the push switch

(See Figs.3)

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

move the screw B attaching the push switch.

(2) Take out the push switch from the CD mechanism assem-

bly.

Reference:

Remove the wires fro m solder ed sections b of the push sw itch
as required.

3.2.3 Removing the base board

(See Figs.3 and 4)

Caution:

Solder the short land c before the f lexib le wire is disc onnec ted
from the connector on the pic ku p. If the f lex ible wire is discon­nected without applying solder, the pickup may be destroyed
by static electricity. (See Fig.3.)
(1) From the bottom side of the CD mechanism assembly, re-

move the scre w C attaching the base board. (See Figs.3

and 4.)
(2) Solder the short land c on the pickup. (See Fig.3.)
(3) Disconnect the flexible wire fr om the conne ctor on the pic k-

up. (See Fig.3.)
(4) Remove the base board from the joints d of the fram e in the

direction of the arrow. (See Figs.3 and 4.)

Reference:

Remove the wires from the soldered sections e on the base
board as required. (See Fig.3.)

Caution:

When reattaching the base board, be sure to remove solder
from the short land c after connecting the flexible wire. (See
Fig.3.)

e

C

Base board

Frame

Wires

B

b

d

Push switch

Flexible wire

Connector

Fig.3

Pickup

CD mechanism
assembly

Pickup

c

C

Base board

Flexible wire

Frame

d

Fig.4

(No.MA387<Rev.003>)1-13

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

• Remove the top cover and base board.

(1) From the top side of the CD mec hanism a ssembly, r emove

the front suspension springs and rear suspension springs
attaching the chassis unit to the frame. (See Fig.5.)

(2) Remove the chassis unit from the da mpers on the f rame in

an upward direction. (See Fig.6.)

Note:

• Pay attention to misuse and loss of each spring. (See Fi g.5.)

• When reassembling, make sure that the three shafts on the
underside of the chassis unit are inserted to the dampers
certainly. (See Fig.6.)

Chassis unit

Front suspension spring

Front suspension spring

Frame

Rear suspension spring Rear suspension spring

Fig.5

Chassis unit

Shaft

Shaft

Damper F

Damper F

Damper R

Frame

Shaft

Fig.6

1-14 (No.MA387<Rev.003>)

3.2.5 Removing the clamper assembly
(See Figs.7 and 8)

• Remove the top cover.

Move the clamper assembly in the direction of the arrow to re­lease the joints f from the chassis unit.

Chassis unit

f

Clamper assembly

Clamper assembly

Chassis unit

f

Fig.7

f

f

Fig.8

(No.MA387<Rev.003>)1-15

3.2.6 Removing the loading/feed motor assembly
(See Fig.9)

• Remove the top cover, base board and cha ss is unit.

From the bottom side of the chassis unit, remove the screw D
and take out the loading/feed motor assembly in the direction of
the arrow.

Reference:

Remove the wires from th e sold ered sec tions g of the lo ading /
feed motor assembly as required.

Loading/feed motor assembly

g

Chassis unit

Loading/feed
motor
assembly

D

Fig.9

1-16 (No.MA387<Rev.003>)

3.2.7 Removing the pickup

(See Figs.10 to 12)

• Remove the top cover, base board and chassis unit.

(1) From the bottom side of the chassis unit, remove the screw

E attaching the pu. shaf t ho lder B an d pull the pu . shaft out
of the pu. shaft holder A. (See Fig.10.)

(2) Remove the screw F attaching the pu. sh aft hol der A. (See

Fig.10.)

(3) Take out the pickup with pu. shaft holder A an d feed s crew

assembly from the chassis unit. (See Fig.11.)

(4) Remove the section h of the pu. shaft holder A in th e direc-

tion of the arrow. (See Fig.11.)

(5) Remove the feed screw assembly from the section j of the

pickup in the direction of the arrow. (See Fig.11.)

(6) Remove the screw G attaching the feed screw holder to the

pickup. (See Fig.12.)

Reference:

Remove the feed nut spring from the feed screw holder
as required. (See Fig.12.)

(7) Release th e c law k in the direction of the arrow to remove

the feed sub holder. (See Fig.12.)

Pickup

Feed screw assembly

Feed screw holder

Pu. shaft holder A

Fig.11

G

h

j

Feed screw
holder

3.2.8 Reattachi ng the picku p

(See Figs.10 to 13)

(1) Reattach the feed sub holder to the pickup. (See Fig.12.)
(2) Reattach the feed screw holder to the pickup using the

screw G. (See Fig.12.)

(3) Reattach the feed screw assembly and pu. shaft holder A

to the pickup as before. (See Fig.11.)

(4) Set the section m of the pickup to the rail of the chas sis unit

at first and attach the pickup to the chassis unit with the

screw F as before. (See Figs.10 and 13.)
(5) Attach the pu. shaft to the pickup as before. (See Fig.10.)
(6) Attach the pu. shaft holder B to the chassis unit with the

screw E as before. (See Fig.10.)

Chassis unit

Pu. shaft holder A

Pu. shaft

F

Pickup

k

Feed sub holder

Pickup

Rail

Feed nut
spring

Fig.12

m

F

E

Pu. shaft holder B

Fig.10

Pickup

Chassis unit

Fig.13

(No.MA387<Rev.003>)1-17

3.2.9 Removing the trigger arm
(See Fig.14)

• Remove the top cover, base board, chassis unit and clamper

assembly.
(1) From the top side of the chassis unit, remove the trigger

arm spring from the sections (n, p).

(2) From the bottom side of the chassis unit, release the claws

q of the trigger arm base in the directio n o f the arrow to re­move them from the sections r of the chassis unit to the
other side.

Note:

When releasing the claws q, t ake care n ot to break th em.

(3) From the top side of the chassis unit, move the select arm

R and select lock arm in the direction of the arrow to re­move the trigger arm base from the section s in the direc­tion of the arrow.

(4) Remove the trigger arm from the section t.

3.2.10 Removing the top plate assembly
(See Fig.15)

• Remove the top cover, base board, chassis unit, clamper as-

sembly and trigger arm.
(1) Remove the screw H attaching the top plate assembly.
(2) Move the top plate assembly in the d irection of the arr ow to

release the joints (u, v).

Reference:

Remove the wires from the soldered sections w of the top plate
assembly as required.

Note:

When reassembling, solder the wires as before.

Select lock arm

Trigger arm
spring

u

v

Select arm R

s

n

t

p

Chassis unit

Top plate assembly

Chassis unit

Trigger arm base

Trigger arm

q

r

Fig.14

H

w

Wire(Red)

1-18 (No.MA387<Rev.003>)

Wire(White)

Wire(Brown)

Fig.15

3.2.11 Removing the mode switch

(See Fig.16)

• Remove the top cover, base board, chassis unit, clamper as-

sembly, trigger arm and top plate assembly.
(1) From the top side of the top plate assembly, remove the

link gear spring from the sections x of the link gear L and
link gear R.

(2) Remove the link gear L in an upward direction whi le releas-

ing the claws y of the link gear L in the direction of the ar­row.

(3) Move the mode switch in the direction of t he arrow 1 to re -

move the sections z of the top plate assembly.

(4) Move the mode switch in the direction of the arrow 2 and

remove the mode switch from the sections (aa, ab).

Note:

When reattaching the link gear L, attach it after aligning the
hole ac of the link gear L to the hole ac of the link gear R.

Reference:

When reassembling, reverse the above removing procedure.

Top plate assembly

Link gear spring

Link gear R

Link
gear R

ac ac

Link gear L

Link
gear L

aa

Fig.16

Mode switch

x

1

2

z

y

y

ab

(No.MA387<Rev.003>)1-19

3.2.12 Removing the select arm R and select lock arm
(See Figs.17 and 18)

• Remove the top cover, base board, chassis unit, clamper as-

sembly, trigger arm and top plate asse mbly.
(1) From the top side of the top plate assembly, remove the

link gear spring from the sections ad of the link gear L and
link gear R. (See Fig.17.)

(2) Remove the link gear R in an upward direction while releas-

ing the claws ae of the lin k gear R in the dire ction of the a r­row. (See Fig.17.)

(3) Move the select arm R in the direction of the arrow 1 to re-

move the sections af of the top plate assembly. (See
Fig.17.)

(4) Move the select arm R in the direction of the arrow 2 and

remove the select arm R from the sections ag. (See
Fig.17.)

(5) From the bottom side of the top plate assembly, remove

the select lock arm spring from the section ah. (See
Fig.18.)

(6) From the top side of the top plate assembly, remove the

section aj of the select lock arm from the top plate assem­bly at first and remove the sections (ak, am) of th e sele ct
lock arm from the top plate assembly. (See Fig.18.)

Note:

• When removing the select lock arm spring, be careful not to
lose it. (See Fig 18.)

• When reattaching the link gear R, attach it after ali gn ing the
hole an of the link gear R to the hole an of the link gear L.
(See Fig.17.)

Reference:

When reassembling, reverse the above removing procedure.

ak

ae

1

2

af

ae

Select arm R

ad

ag

Link gear R

Select lock arm

aj

Link gear spring

Top plate assembly

Link gear L

Link
gear R

an an

Fig.17

Top plate assembly

Link
gear L

1-20 (No.MA387<Rev.003>)

Select lock
arm spring

ah

am

Fig.18

3.2.13 Removing the loading roller assembly
(See Figs.19 to 21)

• Remove the top cover, base board, chassis unit, clamper as-

sembly and top plate assembly.
(1) From the left side of the chassis unit, remove the screw J

attaching the lock arm assembly. (See Fig.19.)

(2) Remove the projection ap of the lock arm assembly from

the joint aq while opening the cam plate R in the direction
of the arrow. (See Fig.19.)

(3) Remove the lock arm assembly from the projection ar of

the chassis unit. (See Fig.19.)

(4) Remove the projection as of the lock arm assembly from

the joint at of the cam plate L assembly. (See Fig.19.)

(5) From the right side of the lock arm assembly, remove the

loading roller spring L from the section au. (See Fig.20.)

(6) From the top side of the lock arm assembly, remove the

loading roller spring R in the direction of the arrow and re­move the loading roller assembly. (See Fig.20.)

(7) Remove the roller guide R, HL washer and roller guide L

from the both ends of the loading roller assembly. (See
Fig.21.)

aq

J

ap

Lock arm assembly

Loading roller assembly

Cam plate R

Fig.19

Chassis unit

Cam plate L assembly

ar

Loading roller spring R

at

as

Lock arm assembly

Loading roller
spring L

au

Fig.20

Roller guide L Roller guide R

HL washer

Loading roller assembly

Fig.21

(No.MA387<Rev.003>)1-21