Jvc Cx-f5k User manual

JVC

MODEL

CX-F5K,

CX-5K

8

For specifications,dimensions and weights of these models, refer to the Instruction Book herewith

attachedtothis ServiceManual.

Contents

Location of Main Parts

. . . . . . .

.

. .

.

. . . . . . . . .

. .

.2

Removal of Main Parts

.

. .

. . .

.

. . . . . . . . .

.

. . . . .

.3

Positioning of the pointer

.

. . . . . .

. .

. . . . . . .

.

4

Service and check method.

. .

.

. .

.

. . . . . .

.

. .

.

. . .

5

Main Adjustments

. . . . .

.

. . . . . . . . . . .

.

. . . . . . . .

6

Parts Arrangement for Alignment

. . . . . . . .

. .

. . . . .

.8

Standard Schematic Diagram of CX-5K.

. . . . . . . .

.

9

Standard Schematic Diagram of CX-F5K

(Amplifire section).

.

. . . . . .

.

. . . .

.

. . . .

.

. . .

.

. . .

10

Standard Schematic Diagram of CX-F5K

(Tuner section)

. . . . . . . . . . .

. .

.

. . .

.

. . .

.

. . . . .

.

11

P. C. Board Parts (MainBoard of CX-5K)

. . .

.

. .

.

. .

12

P. C. Board Parts (Main Board of CX-F5K).

. . . . . .

.

13

P. C. Board Parts (Governer Board)

. . . .

. .

.

14

P.

C. Board Parts List (Main Board of CX-5K)

. .

.

14

P. C. Board Parts List (Main Boardof CX-F5K)

.

. . .

15

Exploved view of Mechanism 18

Assembly and Parts List.

.

. . . . . . . .

..

. . . . . . .

.

17

Exploved view of Enclosure Assembly and Parts List

. .

18

Packing and Packing Parts List

. . . .

.

. .

.

. . . . . . .

. .

21

Accessories

. . . .

.

. .

.

. . . . . . .

.

. . . . .

.

Back Cover

No. 1665

Novern

ber

1985

Location

of

Main

Parts(~echanisrn

section)

Top

View

ldler Gear(R)

ldler Gear(F)

Motor

Main puly

Sub chassis

I

Bottom

View

Capstan Motor

1

Belt

1

Pinch Roller

I

Arimus Adj ~ckew

I

P. B Head

I

~ituatorBraeket

Pinch Roller(FWD)

Elrevtor

I

Reel unit

~ctuatbrMotor

I

Main Pulley

I

Flywheel(REV)

Flywheel(FWD)

2

(No.

1665)

Removal of Main Parts

Note:This unitcan easily be damaged by incorrect servicing

due to

its

compact size. To avoid this, classify the

mountingscrews in removal.

Lid

Ass'y

1.

Remove the slide knobof the REVERSE MODE switch.

2.

Remove three screws

@

secured from the front, two

screws

@

on both sides and three screws

@

secured

from theinside.

(Theazimuth can be adjusted in this condition.)

Note:When assembling the lid ass'y, confirm that there is

no deformation of the contacts on the PWBs in the

mechanism operation section.

BottomCover

1.

Remove the eject knob by holding it up and pushing it

out.

2.

Remove two screws

13

fixing the bottom cover from

bothsides.

3.

Remove a screw

@

fixing the middle of the name

plate.

4.

Removea screw

@.

5.

Removethe bottom cover from the reverse side.

Inner Liner

Remove four screws

@,

@

and

@.

Note:Too much pressure will break the flexible PWB; it

requires very careful handling.

(No. 1665)

3

Boardsand Mechanism

1. Remove twoscrews 11 fixing the main PWB on the lid

side and twoscrews

12

fixing the contact PWB.

2.

Remove twoscrews 13 fixing the PWB on the bottom.

tact PWB.

8

Note:The spring can be removed by removing the con-

3. To remove the chassis, remove three screws

'@

and

8.

4.

~fterthe above procedure, it can be seen that the actu-

ator motor of mechanism and the head ere soldered to

the main PWB and the capstan motor and the wire of

the

@

side of the battery are soldered to the governor

PWB.

MechanismAss'y

1. Remove the head lead and the wire of the actuator

motor from the main PWB.

2.

Remove the wire of the capstan motor and wires, etc.

connectedto the main PWB.

Positioning of the pointer

SPSJ1735N

L?

Adjustment of

Pointer Position

4

(No. 1665)

Service

and

check method

Note: When disassembled, the CX-F5/CX-5 cannot be

operated normally, so check as described below.

1.

Explodedview

(This illustration shows the mechanism ass'y set up verti-

cally. Inorder to

set

it

up vertically, removethe governor

P.C.B. from the chassis.)

2.

Check procedure

1) Disassemble as shown in Fig. 1. (The unit does not

operate inthis condition.)

2) Solder the wires at points

@

to

@

where thewires

go out. (Avoid re-solderingafter this as itwill cause a

malfunctionafter assembly.)

3)

Connect Q306 collector and GND by soldering in a

wire. (Sinceremovingthe governor P.C.B. causes auto

stop to operate, this

is

defeated by the wire.)

.

~

1) Connect wires

@,

@

and

@

andwire

@

.

2) Position the slide switch of the governor

P.C.B.

tothe

switch arm position of the mechanism ass'y.

3) Temporarily connect the PLAY/DIRECTlON button

and point

@

with awire.

*

After the above procedure, itis possible todo normal

operations.

4.

Operation modes

Terminal

Notes:

"-"

indicatesopen.

"L" indicatesthat it is grounded (point

@

).

"H"

indicates open with B+ supplied from the

mechanism control IC.

Main Board

I

Collector

Q30,k

E

PLAY/DIRECTION

STOP

Mecha Ass'y

(No.

1665) 5

Main Adjustments

CASSETTE ADJUSTMENTS

Conditions Power supply

:

DC 1.5 V

Output

:

Load impedanceof 16

Cl

at headphonesterminals

I

Tape tobe used

1

Items Adjustment procedure

1.

frequency

response check

2.

sensitivity

adjustment

Azimuth

adjustment

Tape speed

adjustment and

wow

&

flutter

check

VTT736

I

follows with respectto 1 kHz.

Test tape

VTT702 (8kHz)

Test tape

VTT712 (3kHz)

Test tape

I

(Normal) 125 Hz

:

-2 dB

f

3 dB

Play back the

test

tape in the FWD and REV

modes and adjust to the mid-point of both

peak levels.

(Apply locking compoundafter adjustment.)

Play back the test tape and adjust the tape

speed so that the counter readingis 3010 Hz

inthe FWD PLAY mode and 2955-3075 Hz

in the REV mode.

Wow

&

flutter should be within 0.5% (JIS

RMS).

The playback output level should be

as

(Metal) 8kHz:-4dBf3dB

Test tape Play back the test tape and adjust so that the

VTT724 (1kHz) output of PB GAIN TP is -25 dB

f

1dB in

the FWD PLAY mode for both L and R

i

Auto stop level

*

Playback Test tape

adjustment

output check

channels.

VTT662 The output

at

the headphoneterminalshould

be 5 mW (0.28 Vl16

Cl)

at 1

%

distortion.

The level difference between L and R chan-

nels should be within 3 dB.

Apply 2.8Vto

+2.2 V line and adjust VR303

so that TP (Q309E) is high (approx. 1.5 V)

and low when the black and white sections

of idler gear F are placed to cover the photo-

coupler. Perform the high and low checking

with the governor PWB installed in the

mechanism.

Select switch

TAPE 70 ps

I

-

Adjustment points

TAPE VR302 on the

governor PWB

6

(No. 1665)

TAPE 120ps

TAPE 70ps

-

Increase 2 dB when

the up points are

short-circuited.

Decrease 2dB when

the down points are

open.

-

TUNER ADJUSTMENTS

(CX-F5K/G)

Conditions Power supply

:

DC 1.5 V

Volume control

:

Set to maximum. (However, set to minimumduring IF adjustments.)

Output measurement point

:

Headphone, output level of 56.6 mV/16

R

Bandselect switch

:

Set to RADIO

Tuning voltage adjustment

Connect the voltmeter to the governor PWB and adjust by fully turning VR2 (Tuning) to the L direction so that the voltage

between TP8 and TP2 (GND) is 1.5f0.1V.

AM

IF

adjustments

Band select switch

:

Set toAM.

Position of VR2

:

Near the minimum voltage (Low) position with no input signal.

Input

:

From TP3 terminal

I

Input signal

I

Adjustment points

I

Output measurementpoints

1

Adjustment procedure

I

(om

IF

synchro-( T3, T4

I

connect

TP~

(hotside) -TP2

sid side)

to

[Set

the output to maximurn and

scope (450kHz)

1

OUT the synchroscope. waveforms on right and left sym-

metrical.

AM

R

F

adjustments

Input

:

Standard loopantenna, SSG modulationoutput of 400 Hz, 30%

I

Items

I

lnputfrequency

I

Adjustment points

I

Positionof VR2

I

Adjustment procedure

I

1

2

FM

IF

and detector adjustments

3

4

5

6

Bandselect switch

:

Set to FM.

Position of VR2

:

Near the maximum voltage (HIGHfrequency) position with no input signal.

lnput

:

From TP4 terminal

520 kHz

1650kHz

I

Input signal

I

~djustmitpoints

1

Output measurementpoints

1

Adjustment procedLe

I

Perform adjustment by repeatingitems 1and 2.

1

From IFsynchro-( TI

+

T2

I

Connect IFOUT to the synchroscope.

I

Set the band select switch to FM.

(

L4

TC4

scope (450kHz)

I

OUT

Set the output to maximum.

Make the left and right partsof the

Scurve symmetrical by rotating T2.

Maximum voltage (HIGHfrequency)

Minimum voltage (LOW frequency)

Perform adjustment by repeating items 4 and 5.

Adjust so that 620kHz signal

is

received.

Adjust so that 1400kHzsignal

is

received.

620 kHz

1400kHz

(No. 1665)

7

Adjust tothe required frequency.

L15

L3

FM

RF

and

MPX

adjustments

Input

:

From rodantennaterminal (TP1)and ground (TP5) Band select switch

:

Set to FM.

FM SSG output

:

400 Hz, 30%(22.5 kHz DEV.) FM mode

:

Set toSTEREO.

Output impedance

:

75

R

unbalanced

Parts Arrangement for Alignment

Main

P.

W.

Board

Adjustment points Positionof

VR2

Items

1

2

TUNING

Adjustment procedure

Inputfrequency

L2

TC2

88

MHz

109 MHz

Governer

P.

W.

Board

3

4

5

lAPE

SPEED

Minimum voltage (LOWfrequency)

Maximum voltage (HIGHfrequency)

8

(No. 1665)

Adjust to the required frequency.

Perform adjustment by repeatingitems 1and 2.

Set the output to maximum.

Adjust to76 kHz.

Connect TP6

-

TP2 (GND)to the

counter.

Adjust so that 90 MHz signal

is

received.

90 MHz L1

VR1

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CX-FSK, CX-5K CX-FSK, CX-5K

1

Exploved view

of

Enclosure Assembly and Parts

List

18

(No.

1665)

A

PARTS

NO.

VDL5104-001M

VYH2175-002

VYH5943-002

VYH2171-001

VYH5885-001

VKW3001-181

SPSK1735N

VYH3354-001

VKH3013-029

SSSK1725M

VYH5982-001

SPSK1416M

REF.

1

2

3

4

5

6

7

8

9

10

11

12

1

PARTS NAME

MECHANISM ASS'Y

HOLDER

SPRING

CHASSIS BASE

LOCK LEVER

SPRING

SCREW

C

RM

FLANGE COLLAR

SCREW

LEVER

MINI SCREW

13

SSSK1733M MINI SCREW

1

REMARKS

14

15

pp

16

17

18

19

25

26

27

28

29

36

37

38

40

44

45

46

47

48

48-

49

50

50-1

5

1

53

54

55

56

5

7

58

5

9

61

62

QTY

1

2

1

VYH5887-001

1

VYH6115-003

SPSH1425N

SPSK1725N

VJC3091-001

VJN3003-001

SPSH1714N

SSSK1420N

SSSK1414N

SSSH1428M

SPSJ1735N

SPSK1425M

VYTT470-001

VYH3356-001

VJD4017-005

VYH6114-001

WSS1400N

VYTT469-002

FOO411-02

VYTT467-002

SPSJ

1720N

VJD2280-003

SPSK1720N

VYH2173-002

SSSK1733M

VYTT471-002

SSSJ1735N

VYH5892-001

VYH5904-001

VYH5893-002

VXP3154-001

VXP3154-002 SPRING

SCREW

BATTERY COVER

PO

I

NTER

SCREW

MINI SCREW

SCREW

MINI SCREW

SPACER

PROTECTOh

RIBBON

ARM

WASHER

BLIND

LUG TERMINAL

SPACER

SCREW

BATTERY CONTACT

INNER LAY

SCREW

ANTENNA HOLDER

MINI SCREW

SPACER

MINI SCREW

SPRING

SPACER

PUSH BUTTON

-

1

2

1

2

4

1

2

CX-F5 ONLY

VMW3229-001

1

5

1

3

1

2

1

2

CONTACTPW BOARD

1

A

parts are safety assurance parts.

When replacing those parts, make sure touse the specified one.

Note: BK

=

Black RD

=

Red SL

=

Silver

A

Ref. No.

20

n

8

21

22

30-34

8

Parts No.

I

Parts Name

I

Remarks

I

Q*~

l

Slide Knob (Black)

"

(Gray)

'

(Black)

"

(Gray)

Cassette LidAss'y

-

BK/RD DOLBY

SL DOLBY

BKIRD TAPEITUNER

SL TAPEITUNER

BKIRD BAND

SL BAND

CX-F5K (BK)

"

(RD)

"

(SL)

CX-F5G (BK)

"

(RD)

"

(SL)

CX-5K (BK)

"

(RD)

'

(SL)

CX-5G(BK)

"

(RD)

Cassette Lid

1

"

(RD) 111

CX-5K (BK)

'

(SL)

CassetteSpring

Tap Plate

Sheet

Cassette Lens CX-F5K

CX-F5G

CX-5K

BKIRD REVERSE MODE

SL REVERSE MODE

Slide Knob

,,

BottomCover

Knob

CX-F5KIG (BK)

"

(RD)

'

(SL)

CX-5K (BK)

"

(RD)

"

(SL)

BK/RD EJECT

SL EJECT

CX-F5K (BK)

"

(RD)

Name Plate

1

"

(RD)

"

(SL)

CX-5K (BK)

"

lRDl

. .

"

(SL)

CX-F5G(BK)

(No.

1665) 19

1

JVC CX-F5K User manual

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