JVC KS-FX922R User Manual

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SERVICE MANUAL

CASSETTE RECEIVER

KS-FX922R

E... Continental Europe

KS-FX922R

Area Suffix

KS-FX922R

DISPDISP

TP TP RDSRDS

PTYPTY

8 9 10 11 127

DAB

Contents

Safety precaution------------------------------------- 1-2

Location of main parts-------------------------------

Disassembly method --------------------------------

Adjustment method ----------------------------------

Description of major ICs ----------------------------

1-3

1-4 1-11 1-15

No.49596

Feb. 2001

Adjustment method

KS-FX922R

Test Instruments reqired for adjustment

1.Digital osclloscope(100MHz)

2.Frequency Counter meter

3.Electric voltmeter

4.Wow & flutter meter

5.Test Tapes

VT724 VT739

VT712 VT703

6.Torque gauge

Power supply voltage

Load impedance Line out

For playback frequency measurement

For wow flutter & tape speed measurement

Measuring conditions(Amplifier section)

for DOLBY level measurement

For head azimuth measurement

Cassette type for CTG-N (mechanism adjustment)

DC14.4V(10.5~16V)

4 (2Speakers connection)

20k

Tuner section BAND STEP FM : 100kHz (Seek), 50kHz (Manual)

AM : 9kHz step

Preset Memory Initialization

Band

FM(MHz)

AM(kHz)

DUMMY LOAD

Exclusive dummy load should be used for AM and 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.

87.5

153

Preset Memory

89.9

97.9

216

603

105.9 999

108.0 1404

87.5

1620

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. pilot7.5kHz dev.

Output level 0dB(1 V,50 /open terminal).

Arrangement of Adjusting

Cassette Mechanism Section

Capstan motor

Cassette mechanism (Surface)

Azimuth screw (Forward side)

Playback head

Tape speed adjust

Azimuth screw (Reverse side)

1-11

KS-FX922R

Main board

Arrangment of adjusting

Head amplifier board section (Reverse side)

VR402:Rch (Dolby NR level adj)

VR401:Rch (Dolby NR Frequency response adj)

B402

E Q401

D401

B401

CP401

R420

B408

R423

R421 R422

Q402

B409

Q403

D402

FSMW1101A

VR402

C417

D403

C418

R424

IC402

R425

C419

C414

B403

B410

B404

C410

C412

C411

R413

C415

R416

R415

C416

R418

R419

CP403

C409

R411

B415

C413

B411

IC401

B412

VR401

B416

R412

R410

C405

R408

C407

C408

R417

R414

B413

R404

B406

B414

R409

C406

R407

R406

B405

TPP

C404

CP402

R402

C401

R405

C403

R401

R403

C402

B407

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 assembly and main board assembly . Check for mechanism driving section such as motor ,etc..

Cassette mechanism

Disassembly method

1. Remove the bottom cover.

2. Remove the front panel assembly.

3. Remove the top cover .

4. Install the front panel.

5. Confirm that current is being carried by connecting an extension cord jig.

Note Available to connect to the CP701 connector when installing the front panel.

Extension cord EXTKSRT002-18P

to Cassette mechanism

1-12

EXTKSRT002-18P

to Main board

Main board

Front panel assembly

Extension cord

Main board

The mechanism should be directly connected to the board using the extension wire. EXT-KSRT002-18P

Cassette mechanism

KS-FX922R

to Cassette mechanism

Extension cord EXTKSRT002-18P

Main board

Front panel assembly

EXTKSRT002-18P

to Main board

1-13

KS-FX922R

Item

Head

1. azimuth adjustment

Conditions

Test tape: SCC-1659 VT703(10kHz)

Adjustment and Confirmation methods

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.

Load the SCC-1659 mirror tape. Adjust with

1. 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.

After switching from REV to FWD then to

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

Adjust with azimuth adjustment screw B so

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

Head azimuth adjustment Load VTT724 (VT724) (1kHz) and play it

1. back in the reverse play mode. Set the Rch output level to max.

Load VTT703 (VT703) (10kHz) and play it

2. 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 .

Engage the reverse mode and adjust the

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

When switching between forward and

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

S.Values Adjust

A line

Head shield

The head is at low position during.

B line

Head shield

The head is at High position during REV.

Output level: Maximum

PBHead

FWD Adj B

REV Adj C

(0 ) (45 )

HEIGHT Adj A

phase

1-14

Tape speed and wow flutter confirmation

Play back frequency response confiramation

When VTT721 (VT721) (315Hz) is played

5. back, the level difference between channels should be within 1.5dB.

Test tape: VTT712 (3kHz)

Test tape: VTT724 (1kHz) VTT739 (63Hz / 1kHz / 10kHz)

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

Check to see if the reading of the F, counter /

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

In case of out of specification, adjust the

2. motor with a built-in volume resistor.

Play test tape VTT724, and set the volume

1. position at 2V.

Play test tape VTT739 and confirm.

2. 1kHz / 10kHz: -1 3dB, 1kHz / 63Hz: 0 3dB,

When 10kHz is out of specification, it will be

3. necessary to read adjust the azimuth.

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

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

Built-in volume resistor

Block Diagram

KS-FX922R

SUB

MOTOR

SWITCH

TO CD CHANGER

J801 CP901

SCK SI/SO

IC801

CHANGER CONTROL

HD74HC126FP-X

JBUS SI

JBUS SO

JBUS I/O

JBUS SCK

CD RCH CD LCH

TO SPEAKER

CONNECTOR TO REAR LINE OUT

J321

L/R F L/R R

IC301

POWER AMP.

LA4743K

OUT LR OUT RR OUT LF OUT RF

IC161

E.VOLUME

TEA6320T-X

TUNER L/R

TAPE L/R

FRONT L/R REAR L/R

TU1

AM/FM TUNER PACK

TAPE END.STANDBY

CN401

CP401

F/R MODE STANDBY FF/REW MOTOR SUBMO TAPE IN DOLBY MS REEL

QAU0222-001

IC701

COMP OUT

IC71

RDS DETECTOR

Tuner.Power AMP.Changer/System Controller

SAA6579T-X

SEEK/STOP

SD/ST

SMETER

SYSTEM CONTROL MICON

UPD178018AGC-603

RDSDA RDSCK

KEY 0 – 2

CJ601

CN601

MAIN

MOTOR

CN403

MOTOR

TAPE IN

MODE

STANDBY

TAPE END

REEL

DOLBY

F/R

MS LCH RCH

FF/REW

SUBMO+ SUBMO-

IC602

REMOTE SENSOR

RPM6938-SV4

REMOCON

LCDDA LCDCK LCDCE

LCD DRIVER/KEY SWITCH CIRCUT

HEAD

CN402

LCH RCH

DC MOTOR DRIVER

MECHANISM CONTROL

LCD1

QNZ0450-001

S1 – S68

COM1 – COM3

IC601

LCD DRIVER

LC75873NW

KEY

– S619

S601

METAL

IC401

PB EQ

CXA2560Q

IC402

LB1641

AB C D E F G

2-1

Standard schematic diagrams

Receiver & System control circuit section

KS-FX922R

FM Radio Signal/Radio Main Signal

AM Radio Signal

Tape PB/Main Signal

AB C D E F G

2-3

KS-FX922R

Mecha control circuit section

Tape PB/Main Signal

AB C D E F G

2-4

KS-FX922R

LCD driver & Operation switch circuit section

AB C D E F G

2-5

SERVICE MANUAL

CASSETTE RECEIVER

KS-FX922R

DISP

TP RDS

PTY

8 9 10 11 127

This model is KS-FX922RE EX that is added to the preceding model, theKS-FX922R E . Therefore the service manual for this model is consisting of Parts list only. For others, please refer to the service manual of KS-FX922R E (issue No.49596).

DAB

Area Suffix

EX Centeal Europe

No.49631

Mar. 2001

KS-FX922R

Parts list(Accessories)

Iten

Parts name

A 2 INST.BOOK

(LANGUAGE)

GET0017-002A (SPA,ITA,SWE,FIN)

P3-17

Parts number

----------------------------

Block No.M4MM

Q'ty

VICTOR COMPANY OF JAPAN, LIMITED

MOBILE ELECTRONICS DIVISION PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan

(No.49631)

200103

JVC KS-FX922R User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual