JVC KSFX-722-R Service manual

SERVICE MANUAL

CASSETTE RECEIVER

KS-FX722R

KS-FX722R

Contents

DISPDISP

TP TP
RDSRDS

PTYPTY

8 9 10 11 127

DAB

MO

Area Suffix

E ---- Continental Europe

Safety precaution
Location of main parts
Disassembly method

1-2
1-3
1-4

COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.

Adjustment method
Wiring connections
Description of major ICs

1-10
1-14
1-15

No.49591

Jan. 2001

Location of main parts

Control unit

Display

KS-FX722R

Control unit

Main unit

Main board

Cassette mechanism

Power IC

Changer control
connector

I/O connector

Main board assembly

RCA jack

Antenna
jack

Tuner
pack

Connector to controller

C.motor assembly

Mechanism control board assembly

Cassette housing

Head

Head relay board

Mechanism control board assembly

Flywheel assembly

Capstan motor assembly

Reel board

1-3

KS-FX722R

Disassembly method

Removal of main parts

Enclosuer section

(1) Detaching the front panel unit (see Fig.2-1)
Side the Release slide knob in the direction of arrow
to detach the front panel unit.

(2) Removing the front chassis(see Fig.2-2)
Disengage the four tabs in the right and left sides of unit
and pull the front chassis forward to remove it.

(3) Removing the bottom cover(see Fig.2-3.2-4)

1.Remove one screw 2 retaining the IC to the heat sink.

2.Remove two screws 1 to remove the heat sink.

3.Turn the upside down, then insert and turn the
screwdriver to remove the bottom cover and
protect sheet.

(4) Removing the main P.C.B.assembly
(with rear panel) (see Fig.2-5)

1.Remove two screws 4 retaining the rear panel to the chassis.

2.Remove two screws 3 retaining the amp. P.C.B. assembly.

3.Lift up the main P.C.B. assembly to remove it. At this
time, remove the connector CP501 connecting the
main P.C.B assembly and mechanism assembly.

(5)Removing the rear panel(see Fig.2-5)
Remove six screws retaining the jacks or the like.
Remove one screw 5 to the IC bracket.
Remove one screw 6 to remove the line-out jack.
Remove one screw 7 to remove the antenna jack.
Remove one screw 8 to remove the changer
controller jack. (except KS-F530R)

Top side

Detach it

Press the Control Panel
Release button to detach the control panel.

Fig. 2 - 1

Bottom Cover

1-4

(6)Mechanism assembly(see Fig.2-6)

1.Remove four mechanism mouting screws 9 retaining
the mechanism assembly.

2.Remove four screws B retaining the cover.

3.Remove one screw which is the fixation of TOP COVER and
the substrate.

(7)Front panel unit(see Fig.7)
Remove four screws A retaining
the rear cover.

Connection to the mechanism
connector position

4

5

8

6

7

3

3

Main Board

CP501

4

KS-FX722R

Adjustment method

Test instruments reqired f

1. Digital osclloscope(100MHz)

2. Frequency Counter meter

3. Electric voltmeter

4. Wow & flutter meter

5. T est T apes

MC-109C

VT724.......................

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

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

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

6. T orque gauge .................... Cassette type for CTG-N

...................

for TAPA CURL confirmation
(without Padd type)

for DOLBY level measurement

or adjustment

(mechanism adjustment)

Measuring conditions(Amplifier section)

Power supply voltage.............. DC14.4V (10.5 - 16V)

Load impedance ........... 4 (2Speakers connection)

Line out............................................................ 20k

Standar

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%

FM mono mode 97.5MHz/66dB,INT/400Hz,22.5kHz

FM stereo mode 1kHz,67.5kHz dev . pilot7.5kHz dev.
Output level 0dB(1 V,50 /open terminal)

d volume position

modulation signal on recieving.

deviation pilot off mono

1-10

KS-FX722R

Main board

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..

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

Cassette mechanism

to Cassette mechanism

EXTKSRT002-18P

Main board

Front panel assembly

to Main board

1-12

KS-FX722R

Wiring connections

Mecha control board

CN403

Reel board

Flat cablle

CN402

Head relay board

CN401

0

9

0

9

9

Playback head

4 20

13

1 3 4

20 9

CP501

Reel motor

Changer connector

0

1

2

3

Sub motor

1
3

1-14

Main board

Control board

CJ701

CP701

Color codes are shown below.

1
2
3
4
5
6
7
8
9
0
D
C

Brown
Red
Orange
Yellow
Green
Blue
Violet
Gray
White
Black
Pink
Light Blue

Description of major ICs

UPD178018AGC584(IC701) : System controller micon

1.Terminal Layout

24 – 1

25

80

KS-FX722R

–

40

–

65

41 – 64

2.Description

Pin

Symbol I/O Function

No.

1 KEY0 I Key input 0
2 KEY1 I Key input 1
3 KEY2 I Key input 2
4 LEVEL I Level meter input
5 SM I Signal meter input
6 SQ I Signal quality input
7 LCDCE O Chip enable output to LCD driver
8 LCDDA O Data output to LCD driver

9 LCDSCK O Clock output to LCD driver
10 BUSI/O O J-BUS I/O switch output
11 UNLOCK O PLL unlock output L:unlock H:lock
12 BUSSI I J-BUS data input
13 BUSSO O J-BUS data output
14 BUSSCK O J-BUS clock output

15 - 20 NC - Non connect

21 GNDPORT - GND for port
22 VDDPORT - VDD for port
23 NC - Non connect
24 AFCK O AF check output L:AF check
25 MONO O Monaural ON/OFF output H:Monaural ON
26 FM/AM O Output for FM power supply H:FM Mode
27 SEEK/STOP O Auto seek/Stop output H:Aut seek L:Stop
28 NC I Non connect
29 IFC I FM middle frequency counter input
30 VDDPLL - VDD for PLL
31 OSC I FM/AM oscillation input
32 NC - Non connect
33 GNDPLL - GND for PLL
34 EO0 O Error out output from change pump
35 EO1 O Error out output from change pump
36 IC - Connect to Ground
37 SD/ST I Seek/Stop port H:SD input

Seek/Stop port L:Stereo input

38 STAGE I H:It is CD mode and there is REPEAT

L:Does not exist
39 NC - Non connect
40 MOTOR O Main motor output H:At rotation
41 FF/REW O MS IC sensitivity switch output L:FF/REW
42 F/R O FWD/REV change input H:FWD L:REV

Pin

Symbol I/O Function

No.

43 DOLBY O Dolby NR output H:Dolby NR ON
44 MS IN I Between tunes signal input

H:Between tunes
45 I2CSCK I/O E-VOL IC control clock I/O
46 I2CDAO O E-VOL IC control data output
47 I2CDAI I E-VOL IC control data input
48 REEL I Reel rotation detect signal input
49 SUBMO- O Sub motor output ­50 SUBMO+ O Sub motor output +
51 MODE I Mode position detection input H:Non-mode

L:Mode position
52 TAPEIN I Cassette in detect input H:IN L:OUT
53 STBY I Standby detect input H:Eject side

L:Operation side
53 T-END I Tape end detect input 200ms L:tape end

54-59 NC - Non connect

60 MUTE O L:Mute ON H:Mute OFF
61 POWER O Power supply output H:power ON
62 TEL-MUTE I TEL-MUTE input

63, 64 NC - Non connect

65 ENC1 I Encoder signal input
66 ENC2 I Encoder signal input
67 ON I H:Operation mode L:Power save mode
68 STOP I Stop mode input
69 RDSCK I RDS clock input
70 RDSDA I RDS data input
71 REMOCON I Remocon signal input (Not used)
72 DETACH I Detach input It is "L" of 200ms or more and

an operation mode H:power save mode
73 JBUS INT I J-BUS Interruption input
74 REGCPU - Connects GND through the capacitor

of 0.1 F
75 GND - To ground
76 X2 - Crystal oscillator connection for system
77 X1 - clock oscillation
78 REGOSC - Connects GND through the capacitor

of 0.1 F
79 VDD - Power supply
80 NC - Non connect

1-15

KS-FX722R

CXA2559Q(IC401):Playback equalizer amplifier with music sensor

1.Pin layout

40 31

1

30

10

11 20

2.Blockdiagram

PBFB2
PBRIN2
PNGND
PNFIN2

VCT

PBREF

PBFIN1
PBGND
PBRIN1

PBFB1

21

31
32
33
34
35
36
37
38
39
40

45k

PBTC2

30

7k/12k

300k

F2

30k

30k

F1

300k

7k/12k

PBOUT2

OUTREF2

29

28

-

+

+

-

TAPEIN2
27

100k

70 /12070 /120

T2

X1

X1

T1

100k

GND
26

FWD/RVS

LPF

DIREF
25

BIAS

MUTE

TAPE EQ

Vcc

+

-

F3

LINEOUT2NCNC
24

23

24dB

-

+

MS MODE

DET

+

-

24dB

22

MSSW
21

MS ON/

OFF

20
19
18
17
16
15
14
13
12
11

MSMODE
DRSW
TAPESW
MUTESW
NC
NC
MSOUT
MSTC
G1FB
G2FB

1-16

1

2

PBTC1

PBOUT1

3

4

TAPEIN1

OUTREF1

5
NC

6
NC

7

8
NC

LINEOUT1

9
NC

10

MSLPF