JVC KS-FX771 Service Manual

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Page 1

SERVICE MANUAL

CASSETTE RECEIVER

4984720035

KS-FX771

Area Suffix

U ------------------- Other Areas

SOUND

ATT

SOURCE

VOL

TABLE OF CONTENTS

1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19

4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23

No.49847

2003/6

Page 2

SPECIFICATION

AUDIO AMPLIFIER SECTION

TUNER SECTION

CASSETTE DECK SECTION

GENERAL Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)

Design and specifications are subject to change without notice.

Maximum Power Output Front 45 W per channel

Rear 45 W per channel Continuous Power Output (RMS) Front 17 W per channel into 4 Ω 40 Hz to 20 000 Hz

at no more than 0.8% total harmonic distortion.

Rear 17 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) Tone Control Range Bass ±10 dB at 100 Hz

Treble ±10 dB at 10 kHz Frequency Response 40 Hz to 20 000 Hz Signal-to-Noise Ratio 70 dB Line-Out Level/Impedance 2.0 V/20 kΩ load (250 nWb/m)

Frequency Range FM 87.5 MHz to 108.0 MHz

AM 531 kHz to 1 602 kHz

[FM Tuner] Usable Sensitivity 11.3 dBf (1.0 µV/75 µ)

50 dB Quieting Sensitivity 16.3 dBf (1.8 µV/75 µ) Alternate Channel Selectivity (400 kHz) 65 dB Frequency Response 40 Hz to 15 000 Hz Stereo Separation 35 dB Capture Ratio 1.5 dB

[AM Tuner] Sensitivity 20 µV

Selectivity 35 dB

Wow & Flutter 0.11% (WRMS) Fast-Wind Time 100 sec. (C-60) Frequency Response 30 Hz to 16 000 Hz (Normal tape) Signal-to-Noise Ratio 56 dB Stereo Separation 40 dB

Grounding System Negative ground Allowable Operating Temperature 0ºC to +40ºC Dimensions (W × H × D) Installation Size (approx.) 182 mm × 52 mm × 150 mm

Panel Size (approx.) 188 mm × 58 mm × 12 mm

Mass (approx.) 1.3 kg (excluding accessories)

1-2 (No.49847)

Page 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.

(No.49847)1-3

Page 4

SECTION 2

Front chassis assembly

Disassembly method

2.1 Main body

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

(1) Press the release button and remove the front panel as-

sembly.

2.1.2 Removing the bottom cover (See Fig.2)

• Prior to performing the following procedures, remove the front

panel assembly. (1) Turn the main body upside down. (2) Insert a screwdriver under the joints to release the two

joints a on the left side, two joints b on the right side and joint c on the back side of the main body, then remove the bottom cover from the main body.

CAUTION:

When releasing the joints using a screwd rive r, do no t damage the main board.

Front panel assembly

Release button

Fig.1

Bottom cover

Joint b

Joint a

2.1.3 Removing the front chassis assembly (See Figs.3 and 4)

• Prior to performing the following procedures, remove the front

panel assembly and bottom cover. (1) Remove the two screws A on the both sides of the main

body. (See Fig.3.)

(2) Remove the two screws B on the front side of the main

body. (See Fig.4.)

(3) Release the two joints d and two joints e on the both sides

of the main body, then remove the front chassis assembly toward the front. (See Fig.3.)

Joint a

Joint d

Joint c

Fig.2

Front chassis assembly

Fig.3

Joint b

Joint e

1-4 (No.49847)

Fig.4

Page 5

2.1.4 Removing the heat sink

(See Fig.5)

• Prior to performing the following procedure, remove the front

panel assembly. (1) R emove the two screws C and screw D attaching the heat

sink on the left side of the main body, and remove the heat sink.

2.1.5 Removing the rear panel

(See Fig.6)

• Prior to performing the following procedure, remove the front

panel assembly and bottom cover. (1) Remove the two screws E, three screws F and three

screws G attaching the rear panel on the back side of the main body.

2.1.6 Removing the main board

(See Fig.7)

• Prior to performing the following procedures, remove the front

panel assembly, bottom cover, front chassis assembly, heat sink and rear panel. (1) Remove the two screws H attaching the main board on the

top chassis.

(2) D isconnect the connector CP701 on the main board from

the cassette mechanism assembly.

Fig.5

Rear bracket

Fig.6

Main board

Heat sink

Fig.7

CP701

(No.49847)1-5

Page 6

2.1.7 Removing the cassette mechanism assembly (See Fig.8)

• Prior to performing the following procedures, remove the front

panel assembly, bottom cover, front chassis assembly, heat sink, rear panel and main board. (1) Disconnect the wire from the connector CN402 on the

mecha board.

(2) Disconnect the card wire from the connector CN403 on the

mecha board.

(3) Remove the four screws J attaching the cassette mecha-

nism assembly to the top chassis, take out the cassette mechanism assembly.

Cassette mechanism assembly

2.1.8 Removing the mecha board (See Fig.9)

• Prior to performing the following procedures, remove the front

panel assembly, bottom cover, front chassis assembly, heat sink, rear panel and main board. (1) Disconnect the wire from the connector CN402 on the

mecha board.

(2) Disconnect the card wire from the connector CN403 on the

mecha board. (3) Remove the screw K attaching the mecha board. (4) Bend the hook f in the direction of the arrow 1 and move the

mecha board in the direction of the arrow 2. (5) Remove the mecha board from the mecha bracket (L) of

the top chassis.

H H

CN402

Top chassis

Fig.8

Mecha board

CN401

Fig.9

CN403

1-6 (No.49847)

Page 7

2.1.9 Removing the front board (See Figs.10 to 12)

• Prior to performing the following procedures, remove the front

panel assembly. (1) Remove the four screws L attaching the rear cover on the

back side of the front panel assembly. (See Fig.10.)

(2) Release the ten joints g, the front panel assembly and rear

cover become separate. (See Fig.11.)

(3) Remove the front board from the front panel assembly.

(See Fig.12.)

Joint g

Rear cover

Front board

Joints g

Fig.10

Joints g

Fig.11

Rear cover

Front panel assembly

Joint g

Front panel assembly

Fig.12

(No.49847)1-7

Page 8

2.2 Cassette mechanism assembly

REFERENCE:

Prior to performing the following procedures, turn the mode gear on the bottom of the body until the respective part comes to the EJECT position (Refer to Fig.1).

2.2.1 Removing the cassette guide (See Fig.2)

(1) Turn the mode gear to set to RVS play or subsequent

mode.

(2) Remove the cassette guide from the main chassis while re-

leasing each two joint tabs a in the direction of the arrow.

Mode gea

Fig.1

Cassette guide

2.2.2 Removing the load arm (See Fig.3)

(1) Remove the E-washer attaching the load arm. (2) Move the load arm in the direction of the arrow and release

the joint b on the cassette catch.

Load arm

E-washer

Tab a

Fig.2

Joint b

Fig.3

1-8 (No.49847)

Page 9

2.2.3 Removing the cassette hanger assembly / cassette holder

(See Fig.4 to 7)

(1) Check the mode is set to EJECT. Push down the front part

of the cassette holder and move in the direction of the arrow to release the joint c.

(2) Move the rear part of the cassette hanger assembly in the

direction of the arrow to release it from the two joint bosses d.

(3) Release the holder stabilizer spring from the hooks e and

f, then pull out from the cassette hanger assembly.

(4) Bring up the rear side of the cassette hanger assembly to

release the joint g and h.

(5) Pull out the cassette catch from the cassette hanger as-

sembly.

Cassette holder assembly

Side bracket

Joints c

Cassette holder assembly

Fig.4

Boss d

Cassette hanger assembly

Boss d

Cassette stabilizer spring

Hook e

Cassette holder assembly

Hook g

Cassette hange

assembly

Hook f

Fig.5

Cassette hanger assembly

Hook h

Fig.6

Cassette hanger assembly

Cassette catch

Cassette holder assembly

Fig.7

(No.49847)1-9

Page 10

2.2.4 Removing the side bracket assembly (See Fig.8 to 10)

(1) Remove the screw A attaching the side bracket assembly. (2) Detach the front side of the side bracket assembly upward

and pull out forward to release the joint i and j in the rear.

CAUTION:

When reassembling, make sure that the boss k of the main chassis is set in the notch of the load rack under the side bracket assembly. Do not reattach the load rack on the boss k.

CAUTION:

After reattaching the side bracket assembly, confirm operation.

Side bracket assembly

Joint i

Joint j

Side bracket assembly

Fig.8

Side bracket assembly

Joint i

Joint j

Load rack

Boss k

Fig.9

Boss k

1-10 (No.49847)

Fig.10

Page 11

2.2.5 Removing the pinch arm (F) assembly

(See Fig.11 and 12)

(1) Remove the polywasher and pull out the pinch arm (F) as-

sembly.

(2) Remove the compulsion spring.

2.2.6 Removing the pinch arm (R) assembly

(See Fig.11 and 12)

(1) Remove the polywasher and pull out the pinch arm (R) as-

sembly.

2.2.7 Removing the slide chassis assembly

(See Fig.13 and 14)

REFERENCE:

It is not necessary to remove the head and the tape guide. (1) Move the slide chassis assembly in the direction of the ar-

row to release the two joints l and remove from the main chassis.

(2) Remove the rack link.

CAUTION:

When reassembling, first reatta ch the ra ck link, an d next fit the boss m and hook n of the slide chassis assembly to the hole of the main chassis, and engage the two joints l.

Joint l

Slide chassis assembly

Fig.13

Head

Tape guide

Boss m

Rack link

Hook n

Polywasher

Compulsion spring

Pinch arm (R) assembly

Pinch arm (F) assembly

Fig.11

Pinch arm (F) assembly

Pinch arm (R) assembly

Polywashe

Fig.14

Polywasher

Fig.12

(No.49847)1-11

Page 12

2.2.8 Removing the head / tape guide (See Fig.16 and 17)

REFERENCE:

It is not necessary to remove the slide chassis assembly. (1) Remove the band attaching the wire to the head. (2) Remove the two screws B, the head and the head support

spring. (3) Remove the pinch arm spring from the tape guide. (4) Remove the tape guide and the pinch spring arm.

CAUTION:

When reattaching the pinch arm spring, set both end of it to the pinch spring arm (remarked o).

CAUTION:

When reattaching the head, set the wires into the groove of the tape guide (Fig.16).

2.2.9 Removing the flywheel assembly (F) & (R) (See Fig.18 and 19)

REFERENCE:

It is not necessary to remove the slide chassis assembly. (1) Remove the belt at the bottom. (2) Remove the two polywashers on the upper side. (3) Pull out each flywheel assembly downward.

Slide chassis assembly

Flywheel assembly (F)

Flywheel assembly (R)

Belt

Fig.17

Polywasher

Head

Head support spring

Tape guide

Pinch spring arm

Head

Fig.15

Tape guide

Pinch arm spring

Flywheel assembly (F)

Flywheel assembly (R)

Fig.18

1-12 (No.49847)

Slid chassis assembly

Fig.16

Page 13

2.2.10 Disassembling the flywheel assembly (F)

(See Fig.19 and 20)

(1) Push and turn counterclockwise the spring holder (F) to re-

lease the three joints p on the bottom of the flywheel.

(2) T he spring holder (F), the TU spring and the friction gear

play come off.

(3) Remove the polywasher and felt.

2.2.11 Disassembling the flywheel assembly (R)

(See Fig.19 and 20)

(1) Push and turn clockwise the spring holder (R) to release

the three joints q on the bottom of the flywheel.

(2) T he spring holder (R), the FF spring and the friction gear

FF come off.

(3) Remove the polywasher and the felt.

2.2.12 Removing the reel board

(See Fig.21 and 22)

(1) R emove the two screws C attaching the reel board. (2) Move the reel board in the direction of the arrow to release

the joint r.

(3) Unsolder the wires if necessary.

CAUTION:

When reattaching, confirm operation of the MODE switch and the ST-BY switch.The mode position between EJECT and ST-BY is optimum for reattaching.Connect the card wire extending from the reel board to the FFC pad before reattaching the reel board.

FFC pad

Joint

Reel board

Fig.21

FFC pad

CT-1 switch

MODE switch

Flywheel assembly (F)

Joint p

Joints p

Fig.19

Polywasher

Spring holder (R)

Spring holder (F)

TU spring

Friction gear FF

Friction gear play

Polywasher

FF spring

Flywheel assembly (R)

Joints q

Joint q

Soldering

ST-BY switch

Fig.22

Felt

Flywheel assembly (F)

Fig.20

Felt

Flywheel assembly (R)

(No.49847)1-13

Page 14

2.2.13 Removing the gear base arm / gear base link assembly (See Fig.23 to 25)

(1) Move the gear base arm in the direction of the arrow. (2) Insert a slotted screwdriver to the gear base spring under

the gear base arm, and release the gear base arm upward from the boss on the gear base assembly.

(3) Remove the gear base arm from the main chassis while re-

leasing the two joints s.

(4) Move the gear base link assemby in the direction of the ar-

row to release the two joints t.

REFERENCE:

When reattaching the gear base arm, make sure that the boss on the gear base assembly is inside the gear base spring.

2.2.14 Removing the FFC pad (See Fig.25 and 27)

(1) Push each joint hook u of the FFC pad and remove toward

the bottom.

Gear base link assembly

Gear base spring

Joint t

Gear base arm

Joints s

Hook u

FFC pad

Hook u

Fig.23

Gear base arm

Screwdriver

Gear base link assembly

Fig.24

Gear base arm

FFC pad

Fig.25

1-14 (No.49847)

Page 15

2.2.15 Removing the mode gear

(See Fig.26 and 29)

(1) Remove the polywasher on the bottom and pull out the

mode gear.

2.2.16 Removing the mode switch actuator

(See Fig.26, 27 and 29)

(1) Pull out the mode switch actuator at the bottom.

REFERENCE:

When reattaching the mode switch actuator to the main chassis, make sure to set on the shaft and insert v into the slot w.

2.2.17 Removing the direction link / direction plate

(See Fig.27 to 29)

(1) Remove the polywasher attaching the direction link. (2) B ring up the direction link to release the three joints x, y

and z at a time.

(3) Move the direction plate in the direction of the arrow to re-

lease the two joints a’.

REFERENCE:

When reattaching the direction plate, engage the two joints a’ and move in the direction of the arrow (Refer to Fig.28).

REFERENCE:

When reattaching the direction link, move the direction plate in the direction of the arrow and engage the three joint x, y and z at a time (Refer to Fig.29).

2.2.18 Removing the mode rack assembly

(See Fig.27 and 28)

(1) Move the mode rack assembly in the direction of the arrow

to release the two joints b’ and the joint c’.

REFERENCE:

When reattaching, set the two b’ on the bottom of the mode rack assembly into the slots of the main chassis and move in the direction of the arrow (See Fig.28).

Direction plate

Joints a'

Joint z

Direction link

Direction plate

Mode switch actuator

Direction link

Fig.26

Slot w

Joint y

Polywasher

Fig.27

Mode rack assembly

Joint b'

Mode gear

Polywashe

Mode rack assembly

Joint x

Joint b'

Joint c'

Joints a'

Fig.28

Direction link

Mode switch actuator

Polywasher

Mode gea

Direction plate

Mode rack assembly

Fig.29

(No.49847)1-15

Page 16

2.2.19 Removing the gear base assembly / take up gear / reflector gear

(See Fig.30 to 32)

(1) Push in the pin d’ of the gear base assembly on the upper

side of the body and move the reflector gear toward the bottom, then pull out.

(2) Remove the polywasher on the bottom and pull out the

take up gear.

(3) Move the gear base assembly in the direction of the arrow

to release it from the two slots e’ of the main chassis.

REFERENCE:

The parts are damaged when removed. Please replace with new ones.

2.2.20 Removing the reel driver / reel spindle (See Fig.32)

(1) Draw out the reel driver from the shaft on the main chassis

and remove the reel driver spring and the reel spindle respectively.

CAUTION:

The reel driver is damaged when removed. Please replace with a new one.

Gear base assembly

Pin d'

Polywasher

Slot e'

Fig.30

Take up gear

Reflector gear

Reel driver

Reel driver spring

Reel spindle

Main chassis

Reflector gear

Fig.31

Reel driver

Reel driver spring

Reel spindle

Gear base assembly

Slots e’

Take up gea

Polywasher

Fig.32

1-16 (No.49847)

Page 17

2.2.21 Removing the side bracket assembly

(See Fig.33 to 37)

(1) Remove the eject cam plate spring. (2) Push the joint f’ through the slot to remove the load rack

downward.

(3) Move the eject cam limiter in the direction of the arrow to

release it from the boss g’ of the side bracket assembly and from the two joints h’.

(4) Move the eject cam plate in the direction of the arrow to re-

lease the joint i’.

CAUTION:

When reassembling, confirm operation of each part before reattaching the eject cam plate spring.

Joint f'

Side bracket assembly

Boss g'

Eject cam plate

Fig.36

Side bracket assembly

Joint i'

Eject cam plate spring

Side bracket assembly

Joint h'

Side bracket assembly

Boss g'

Load rack

Fig.33

Eject cam limiter

Joint f'

Fig.34

Eject cam limiter

Eject cam plate

Joint i'

Fig.37

Joint h'

Load rack

Joint h'

Eject cam plate

Fig.35

Joint h'

(No.49847)1-17

Page 18

2.2.22 Removing the main motor assembly / sub motor assembly

r r

(See Fig.38 to 40)

(1) Remove the belt at the bottom. (2) Remove the polywasher and pull out the mode gear. (3) Pull out the reduction gear (B). (4) Remove the polywasher and pull out the reduction gear

(A).

(5) Remove the two screws attaching the main motor assem-

bly.

(6) Remove the two screws E attaching the sub motor assem-

bly.

(7) Unsolder the wires on the reel board if necessary.

CAUTION:

When reassembling, adjust the length of the wires extending from the sub motor asswmbly by attaching them to the side of the sub motor assembly with the wires extending from the main motor assembly using a spacer.

Belt

Reduction gear (B)

Mode gear

Polywasher

Fig.38

Main motor

assembly

Reduction gear (A)

Polywashe

Sub moto assembly

Polywasher

Reduction gear (A)

Spacer

Sub motor assembly

Fig.39

Main motor assembly

Sub motor assembly

Fig.40

Main motor assembly

Space

1-18 (No.49847)

Page 19

SECTION 3

Adjustment

3.1 Adjustment method  Test instruments required for adjustment

(1) Digital oscilloscope (100MHz) (2) Frequency counter meter (3) Electric voltmeter (4) Wow & flutter meter (5) Test tapes

• VT724...........................For DOLBY level measurement

• VT739..............For playback frequency measurement

• VT712....For wow flutter & tape speed measurement

• VT703........................For head azimuth measurement

(6) Torque gauge............................Cassette type for CTG-N

 Measuring conditions (Amplifier section)

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

• Load impedance............ 4Ω (4Ω to 8Ω allowance)

• Line out level/Impedance..............1.0V/20k load (250 nWb/m)

 Standard volume position

Balance and Bass, Treble volume, Fader : Center (Indication "0") Loudness, Dolby NR, Sound, Cruise : Off Volume position is about 2V at speaker output with following conditions, Playback the test tape VT721.

AM mode 999kHz/62dB, INT/400Hz, 30%

modulation signal on receiving.

FM mono mode 97.9MHz/66dB, INT/400Hz, 22.5kHz

deviation pilot off mono FM stereo mode 1kHz, 67.5kHz dev. pilot 7.5kHz dev. Output level 0dB (1µV,50Ω/open terminal)

(No.49847)1-19

Page 20

 Information for using a car audio service jig

(1) We're advancing efforts to make our extension cords common for all car audio products.

Please use this type of extension cord as follows.

(2) As a U-shape type top cover is employed, this type of extension cord is needed to check operation of the mechanism assembly

after disassembly. (3) Extension cord : EXTKSRT002-18P ( 18 pin extension cord ) For connection between mechanism assemblyand main board. (4) Check for mechanism drivin g section such as motor ,etc.

 Disassembly method

(1) Remove the front panel assembly. (2) Remove the bottom cover. (3) Remove the front chassis. (4) Remove the heat sink. (5) Remove the rear panel (6) Remove the main board. (7) Reattach the heat sink with the two screws B. (Refer to Disassembly method.) (8) Reattach the rear panel with the screw E. (Refer to Disassembly method.) (9) Reattach the front panel assembly.

(10) Confirm that current is being carried by connecting an extension cord jig.

NOTE:

Available to connect to the CJ601

CAUTION :

Be sure to attach the heat sink and rear panel on the power amplifier IC and regulator IC of a main board when supplying the power.If voltage is applied without attaching those parts, the power amplifier IC and regulator IC will be destroyed by heat.

connector when installing the front panel.

To Cassette mechanism

EXTKSRT002-18P

Extension cord EXTKSRT002-18P

To Main board

Front panel assembly

Cassette mechanism

Main board

1-20 (No.49847)

Page 21

 Arrangement of adjusting & test points

Cassette mechanism (Surface)

Motor assembly

Tape speed adjust

Azimuth screw

(Forward)

Playback head

Azimuth screw B

(Reverse)

Head section view

Azimuth screw B

(Reverse)

Playback head

Azimuth screw A

(Forward)

(No.49847)1-21

Page 22

Item Conditions Adjustment and Confirmation methods S.Values Adjust

1. Head azimuth adjustment

Test tape: SCC-1659 VT703 (10kHz)

Head height adjustment

Adjust the azimuth directly. When you adjust the height using a mirror tape, remove the cassette housing from the mechanism chassis. After installing the cassette housing, perform the azimuth adjustment. (1) Load the SCC-1659 mirror tape. Adjust with height

adjustment screw A and azimuth adjustment screw B so that line A of the mirror tape runs in the center between Lch and Rch in the reverse play mode.

(2) After switching from REV to FWD then to REV,

check that the head position set in procedure 1 is not changed. (If the position has shifted, adjust again and check.)

(3) Adjust with azimuth adjustment screw B so that line

B of the mirror tape runs in the center between Lch and Rch in the forward play mode.

Head shield

The head is at low position during.

Head shield

The head is at High position during REV.

A line

B line

Test tape: VT724 (1kHz) VT703 (10kHz) VT721 (315Hz)

2. Tape speed and wow flutter confirmation

3. Play back frequency response confirmation

The tuner section is of an adjustment-freedesign. In case the tuner is in trouble, replace the tuner pack.

Test tape: VT712 (3kHz)

Test tape: VT724 (1kHz) VT739 (63Hz / 1kHz / 10kHz)

Head azimuth adjustment

(1) Load VT724 (1kHz) and play it back in the reverse

play mode. Set the Rch output level to max.

(2) Load VT703 (10kHz) and play it back in the forward

play mode. Adjust the Rch and Lch output levels to max, with azimuth adjustment screw B. In this case, the phase difference should be within 45 .

(3) Engage the reverse mode and adjust the output lev-

el to max, with azimuth adjustment screw C.(The phase difference should be 45 or more.)

(4) When switching between forward and reverse

modes, the difference between channels should be within 3dB. (Between FWD L and R, REV L and R.)

(5) When VT721 (315Hz) is played back, the level differ-

ence between channels should be within 1.5dB.

(1) Check to see if the reading of the F, counter / wow

flutter meter is within 3015Hz to 3045Hz (FWD/ REV), and less than 0.35% (JIS RMS).

(2) In case of out of specification, adjust the motor with

a built-in volume resistor.

(1) Play test tape VT724, and set the volume position at

2V.

(2) Play test tape VT739 and confirm.1kHz / 10kHz: -1

±3dB,1kHz / 63Hz: 0 ±3dB,

(3) When 10kHz is out of specification, it will be neces-

sary to read adjust the azimuth.

Output level: Maximum

FWD Adj B

REV Adj C

Tape speed: 3015Hz to 3045Hz Wow flutter: less than 0.35%

Speaker out 1kHz / 63Hz: 0 ±3dB 1kHz / 10kHz: -1 ±3dB

PBHead

HEIGHT Adj A

(0 ) (45 )

phase

Built-in volume resistor

1-22 (No.49847)

Page 23

4.1 AN80T05 (IC901) : Regulator

• Terminal layout & Block diagram

Reference Voltage

Thermal

Protection

SECTION 4

Description of major ICs

ASO & Peak

Current Protection

Pre

Drive

Pre

Drive

AMP

Out

AMP

Out

Pre

Drive

123456789101112

ILL

MODE2 MODE1 STB VDD

10V

5.6V

AMP VCC ANT COM

• Pin function Pin No. Symbol Function

1 ILL 10V power supply for illumination. 2 MODE2 When 5V is input,becomes AM. and the antenna output is turned on. 3 MODE1 When 5V is input,becomes AM. and the output of FM is switched. 4 STB When 5V is input outputs to ILL,COM,and AMP. It is 0V usually. 5 VDD 5.6V power supply. 6 AMP Power supply supply to remote amplifier 7 VCC Back up. connects with ACC with it. 8 ANT Power supply supply to auto antenna.

9 COM 8.7V power supply. 10 AM The power supply of 8.7V to AM. 11 FM The power supply of 8.7V to FM. 12 GND Ground

4.2 LB1641 (IC402) : DC Motor driver

• Pin layout • Truth table Input Output Mode

IN1 IN2 OUT1 OUT2

0000 Brake

1 2 3 4 5 6 7 8 9

GND OUT1 P1

VZ IN1 IN2

VCC1

VCC2 P2

OUT2

1010 CLOCKWISE 0101COUNTER-CLOCKWISE 1100 Brake

Pre

Drive

8.7VAM8.7VFM8.7V

Pre

Drive

GND

(No.49847)1-23

Page 24

4.3 KIA7810PI (IC902) : Regulator

• Pin layout

1 2 3

• Block diagram

1 INPUT

R4 R18

Q12

Q10

Q13

R10 R3

4.4 RPM6938-SV4 (IC602) : Remote sensor

• Pin diagram

R15

Q14

R14

R16

Q15

Q11

R13

R21

R17

Q16

R12

Q17

R11

3 OUTPUT

R20

R19

2 GND

• Block diagram

1-24 (No.49847)

1 2 3

I/V conversion

AMP

magnetic shield

BPF

fo trimming circuit

AGC

Detector

Vcc

Comp

Vcc

22k

Rout

GND

Page 25

4.5 HA12231FP-X (IC401) : PB Equalizer/Line Mute/Music Sensor

• Pin layout & Block diagram

Vcc

14 13 12 11 10

Ripple Filter

ALC

1 2 3 4 5 6

GND

Amp.

Ch2

Amp.

Ch1

• Pin function

Pin No. Symbol I/O Function

1 VREF O Reference output 2 FIN(R) I Equalize r input 3 RIN(R) I Equalizer input 4 EQOUT(R) O Equalizer output 5 TAI(R) I Tape input 6 PBOUT(R) O PB output 7 MS GV - MS gain terminal 8 120/70 I Mode control input

9 Mute I Mode control input 10 FOR/REV I Mode control input 11 Vcc - Power supply 12 MS O MS output (to MPU) 13 MSDET - Time constant pin for MS rectifier 14 RIP - Ripple filter 15 PBOUT(L) O PB output 16 TAI(L) I Tape input 17 EQOUT(L) O Equalize r output 18 RIN(L) I Equalizer input 19 FIN(L) I Equalizer input 20 GND - Ground

(No.49847)1-25

Page 26

4.6 LA4743K (IC301) : Power amp.

• Block diagram

IN 1

TAB

IN 2

0.22 F

Vcc 1/2 Vcc 3/4

6 20

Protective

circuit

2200 F 0.022 F

OUT 1+

OUT 1-

PWR GND1

OUT 2+

OUT 2-

PWR GND2

ST BY

R.F

47 F

IN 3

PRE GND

IN 4

+5V ST ON

0.22 F

N.C

0.22 F

Stand by

Switch

Mute

3.3 F

OUT 3+

OUT 3-

10K

Low Level Mute ON

Ripple

Filter

Mute

circuit

PWR GND3

OUT 4+

OUT 4-

Protective

circuit

ON TIME C

1-26 (No.49847)

22 F

Muting &

ON Time Control

Circuit

PWR GND4

Page 27

• Pin layout

TAB

GND

FR-

STDBY

FR+

VP1

RR-

GND

RR+

RIPPLE

INRF

INRR

SGND

FLIN

RLIN

DNTIME

RL+

GND

RL-

VP3

FL+

MUTE

FL-

GND

• Pin function Pin No. Symbol Function Pin No. Symbol Function

1 TAB Header of IC 14 FLIN Front Lch input 2 GND Power GND 15 RLIN Rear Lch input 3 FR- Outpur(-) for front Rch 16 ONTIME Power on time control 4 STDBY Stand by input 17 RL+ Output (+) for rear Lch 5 FR+ Output (+) for front Rch 18 GND Power GND 6 VP1 Power input 19 RL- Output (-) for rear Lch 7 RR- Output (-) for rear Rch 20 VP3 Power input 8 GND Power GND 21 FL+ Output (+) for front

9 RR+ Output (+) for rear Rch 22 MUTE Muting control input 10 RIPPLE Ripple filter 23 FL- Output (-) for front 11 RRIN Rear Rch input 24 GND Power GND 12 FRIN Front Rch input 25 NC Non connection 13 SGND Signal GND

4.7 HD74HC126FP-X (IC801) : Buffer

• Pin layout • Pin function

GND

1 2 3 4 5 6 7

14 13 12 11 10

9 8

VCC

Input Output CA Y LX Z HL H HH L

Note:

H:High level L:Low level X:Irrelevant Z:Off(High-impedance) State a 3-state input

• Block diagram

Vcc Vcc

Input

Note:

CL includes probe and jig capacitance

See Function Table

1A 2A 3A 4A 1C 2C 3C 4C

Output

Sample as Load Circuit 1

(No.49847)1-27

Page 28

4.8 PT6523LQ (IC601) : LCD driver

• Pin layout

48 ~ 33

1 ~ 16

• Block diagram

COMMON

DRIVER

CLOCK

GENERATOR

ADDRESS

DETECTOR

SEGMENT DRIVER & LATCH

SHIFT REGISTER

• Piin function Pin No. Pin Name I/O Description

1~ 52 SG1 ~ SG52 O Segment Output Pins

53~55 COM1 ~ COM3 O Common Driver Output Pins

56 VDD - Power Supply 57 INH

I Display OFF Control Input Pin

When this pin is "Low", the Display is forcibly turned OFF. (SG1 to SG52, COM1 to COM3 are set to "LOW"). (See Note 1) When this pin is set to "High", the Displa is ON.

58 VDD1 I Used for the 2/3 Bias Voltage when the Bias Voltages are provied externally. Connect to VDD2

when 1/2 Bias is used.

59 VDD2 I Used for 1/3 Bias Voltage when the Bias Voltages are provided externally. Connect to VDD1

when 1/2 Bias is used. 60 VSS - Ground Pin. 61 OSC I/O Oscillation Input /Outout Pin 62 CE I Chip Enable Pin 63 CLK I Synchronization Clock 64 DI I Transfer Dat a Pin

Note 1:

When INH

= "LOW" : Serial data trensfers can be performed when the display is forcibly OFF.

1-28 (No.49847)

Page 29

4.9 TEA6320T-X (IC161) : E.volume

• Pin layout

SDA

GND

OUTLR

OUTLF

B2L

B1L

IVL

ILL

QSL

IDL

MUTE

ICL

IBL IAL

14 15 16

CD-CH

TAP E

TUNER

IMD

• Block diagram

10 8 9 7 6

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

SCL VCC OUTRR OUTRF TR B2R B1R IVR ILR QSR IDR Vref ICR CAP IBR IAR

21 31

POWER

SUPPLY

VOLUME 1

+20 to -31 dB

LOUDNESS

LEFT

16 15 13 11

22 20

SOURCE

SELECTOR

VOLUME 1

+20 to -31 dB

LOUDNESS

RIGHT

18 17

23 25 24 26 27 28

• Pin functions Pin

No.

Symbol I/O Functions

1 SDA I/O Serial data input/output. 2 GND - Ground. 3 OUTLR O output left rear. 4 OUTLF O output left front. 5 TL I Treble control capacitor left channel

or input from an external equalizer.

6 B2L - Bass control capacitor left channel or

output to an external equalizer. 7 B1L - Bass control capacitor left channel. 8 IVL I Input volume 1. left control part. 9 ILL I Input loudness. left control part.

10 QSL O Output source selector. left channel. 11 IDL - Not used 12 MUTE - Not used 13 ICL I Input C left source. 14 IMO - Not used 15 IBL I Input B left source. 16 IAL I Input A left source.

BASS LEFT

+15 dB

LOGIC

BASS

RIGHT

+15 dB

VOLUME 2 0 to 55 dB BALANCE

FENDER REAR

VOLUME 2

0 to 55 dB

BALANCE

FENDER FRONT

HC BUS

REC

VOLUME 2

0 to -55dB BALANCE

FENDER FRONT

VOLUME 2

0 to -55dB BALANCE

FENDER REAR

TREBLE

LEFT

+12 dB

TREBLE

RIGHT

+12 dB

No.

MUTE

FUNCTION

ZERO CROSS

DETECTOR

Symbol I/O Functions

17 IAR I Input A right source. 18 IBR I Input B right source. 19 CAP - Electronic filtering for supply. 20 ICR I Input C right source. 21 Vref - Reference voltage (0.5Vcc) 22 IDR - Not used 23 QSR O Output source selector right channel. 24 ILR I Input loudness right channel. 25 IVR I Input volume 1. right control part. 26 B1R - Bass control capacitor right channel 27 B2R O Bass control capacitor right channel

or output to an external equalizer.

28 TR I Treble control capacitor right channel

or input from an external equalizer. 29 OUTRF O Output right front. 30 OUTRR O Output right rear. 31 Vcc - Supply voltage. 32 SCL I Serial clock input.

(No.49847)1-29

Page 30

4.10 LC72366-9B77 (IC701) : System CPU

• Pin layout

41 64

• Pin function Pin No. Symbol I/O Function

1X IN IX'tal 2 TEST2 I 3 J-BUS SI I J-BUS data input 4 J-BUS SO O J-BUS data output 5 J-BUS SCK I/O J-BUS clock input/output 6 J-BUS I/O O J-BUS I/O selection output 7 NC - Not used 8 LCD SO O LCD driver DATA output

9 LCD SCK O LCD driver CLK output 10 LCD CE O LCD driver CE output 11 NC O Not Used 12 E.VOL DA O E.VOL DATA output 13 E.VOL SCK O E.VOL SCK output 14 OPEN I DOOR OPEN SW 15 ANT REMOTE O Antenna Control output 16 MUTE O Mute output

17 to 24 NC - Not used

25 KS1 O Stage matrix output 26 KS0 O Stage matrix output 27 K3 I Stage matrix input 28 K2 I Stage matrix input 29 K1 I Stage matrix input 30 K0 I Stage matrix input 31 Vdd 5V - 32 TEST I Select the key input mode 33 FF/REW O Audio level control for MS 34 SEEK/STOP O auto seek/receiving control output 35 MONO O Mono control output 36 IFC CONT O IFC control output 37 NC - Not used 38 PWR-CONT O Power ON/OFF control output

39 to 40 NC - Not used

41 MOTOR O Main motor control 42 SUBMO+ O Sub motor control Loading direction 43 SUBMO- O Sub motor control Eject direction 44 NC - Not used 45 TAPE IN I Cassette tape inside signal 46 STAND BY I Stand-by position detection signal input 47 REEL I Reel pulse signal input 48 MODE I Mecha position detection signal 49 HEAD SEL(F/R) O Audio signal selecter for head amp 50 MS IN I MS signal input 51 SD/ST I Signal Detector/Stereo siganl input

1-30 (No.49847)

Page 31

Pin No. Symbol I/O Function

52 DETACH O Detach detecting input 53 VOL-1(JOG0) I Encoder Input 54 VOL-2(JOG1) O Encoder Input 55 J-BUS INT I J-BUS interrupt input 56 REMOCON I Remote control signal input 57 FM/AM O FM/AM selecting output

58 to 60 NC - Not used

61 MEM DET I Memory ON/OFF detection signal input 62 LEVEL METER I Level meter input 63 S.METER I S.METER input 64 KEY2 I A/D key input2 65 KEY1 I A/D key input1 66 KEY0 I A/D key input0 67 ACCDET I ACC ON/OFF detection signal input 68 SENSE I Voltage sense input 69 NC I 70 FM IF COUNT I IF count input

71,72 NC - Not used

73 Vdd - 74 NC I 75 FM OSC I FM/AM local osc input 76 Vss - 77 NC - Not used 78 EO O Error output 79 TEST1 - 80 X OUT I X'tal

(No.49847)1-31

Page 32

1-32 (No.49847)

Page 33

VICTOR COMPANY OF JAPAN, LIMITED

AV & MULTIMEDIA COMPANY MOBILE ENTERTAINMENT CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan

(No.49847)

Printed in Japan

WPC