Pioneer Cdx-m12 User manual

YW)

PIONEER’

The

Art

of

Entertainment

ORDER

NO.

MULTI-COMPACT

DISC

PLAYER

Cc

LD

x

IVI

UC,

EW

COMPACT

DIGITAL

AUDIO

@See

the

separate

manual

CX-612

(CRT1518)

for

the

CD

mechanism

description.

CONTENTS

~

1.

SAFETY

INFORMATION

........escesesesscssesseeseeseceeeenenieee

2

9.

CHASSIS

EXPLODED

VIEW............:ceceeseeeeeneeeteees

51

2.

DISASSEMBLY

.......cccecceecceeesssesecssseneeeeeeeneseenereneesensaes

3

10.

MAGAZINE

ASSY

EXPLODED

VIEW...

54

3.

BLOCK

DIAGRAM

........ceseeeeceeesseeeeeeerenesseseneneseneeneners

5

11.

CD

MECHANISM

UNIT

EXPLODED

VIEW..............

56

A,

ADJUSTMENT

0.0...

ccccececcesseesenesesscseeeseesseeeeeneeeeeeseeeeees

7

12.

PACKING

METHOD.

........ccccscecesseeseeesneeeeenseeeeeeenees

63

5.

CONNECTION

DIAGRAM(1)........::eeseeeeeteeretereeeeeers

39

13.

ELECTRICAL

PARTS

LIST

..........cccscssessseesreetteeetettees

64

6.

SCHEMATIC

CIRCUIT

DIAGRAM(1)........:---seeseeeees

43

14.

CIRCUIT

DESCRIPTION...

cee

ceecceseeseeeeseetereeseeetere

66

7.

SCHEMATIC

CIRCUIT

DIAGRAM(2)........:::eceeeeeeee

46

15.

OPERATIONS

AND

CONNECTION

.........ceseereretees

86

8.

CONNECTION

DIAGRAM(2)........ccccceseseeereetereereeeees

49

SPECIFICATIONS

@CD

Player

Service

Precautions

one

C

di di

1.Since

these

screws

protects

the

mechanism

during

TSH

eee

ee

ompactdise

audio

system

“transport,

be

sure

to

affix

it

when

its

transported

for

Signal

format

...........-

Sampling

frequency:

44.1

kHz

repair,

etc.

Number

of

quantisation

bits:

16;

linear

2.For

pick-up

unit

handling,

please

refer

to

Power

source

......

14.4

V

DC

(10.8

—

15.6

V

allowable)

“Disassembly”.

During

replacement,

handling

precau-

Ween

pence

taeda

ceecumaiatan

8

kg

(6

Aaa

tions

shall

be

taken

to

prevent

an

electrostatic

dis-

Dimensions.

.............275

(W)

x

93

(H)

x

168

(D)

mm

charge

{protection

by

a

short

pin):

[10-7/8

(W)

x

3-5/8

(H)

x

6-5/8

(D)

in.]

3:During

disassembly,

be

sure

to

turn

the

power

off

since

an

internal

IC

might

be

destroyed

when

a

con-

Audio

i

nector

is

plugged

or

unplugged.

Frequency

characteristics

........

5

—

20,000

Hz

(+1

dB)

Signal-to-noise

ratio

.97

dB

(1

kHz)

(IHF-A

Network)(UC)

97

dB

(1

kHz)

(IEC-A

Network)(EW)

Dynamic

range

.......

00.

cece

eee

ee

eee

ee

94

dB

(1

kHz)

-

Output

level.............

0.

eee

e

eee

500

mV

(1

kHz,

0

dB)

Number

of

channels.............00e

eee

e

eee

ee

2

(stereo)

Note:

Specifications

and

the

design

are

subject

to

possible

modification

without

prior

notice

due

to

improvements.

PIONEER

ELECTRONIC

CORPORATION

4-1,Meguro

1-Chome,Meguro-ku,

Tokyo

153,Japan

PIONEER

ELECTRONICS

SERVICE

INC.

P.O.Box

1760,Long

Beach,California

90801

U.S.A.

PIONEER

ELECTRONICS

OF

CANADA,

INC.

300

Allstate

Parkway

Markham,Ontario

L3R OP2

Canada

PIONEER

ELECTRONIC

[EUROPE]

N.V.

Haven

1087

Keetberglaan

1,9120

Melsele,

Belgium

PIONEER

ELECTRONICS

AUSTRALIA

PTY.LTD.

178-184

Boundary

Road,Braeside,

Victoria

3195,Australia

TEL:{03]580-9911

©

PIONEER

ELECTRONIC

CORPORATION

1993

Sune

ven

eaneainaeen

1.

SAFETY

INFORMATION

1.1

CDX-M12/EW

1.

Safety

Precautions

for

those

who

Service

this

Unit.

+

Follow

the

adjustment

steps

(see

pages

7

through

25)in

the

service

manual

when

servicing

this

unit.

When

check-

ing

Or

adjusting

the

emitting

power

of

the

laser

diode

exercise

caution

in

order

to

get

safe,

reliable

results.

Caution:

1.

During

repair

or

tests,

minimum

distance

of

13cm

from

the

focus

lens

must

be

kept.

2.

During

repair

or

tests,

do

not

view

laser

beam

for

10

seconds

or

longer.

2.

A”“CLASS

1

LASER

PRODUCT”

label

is

affixed

to

the

3.

The

triangular

label

is

attached

to

the

mechanism

rear

of

the

player.

unit

frame.

CLASS

1

LASER

PRODUCT

Fig.1

Fig.2

4.

Specifications

of

Laser

Diode

Specifications

of

laser

radiation

fields

to

which

human

access

is

possible

during

service.

Wavelength

785

nanometers

Radiant

power

69.7

microwatts(Through

a

circular

aperture

stop

having

a

diameter

of

80

millimeters)

0.55

microwatts(Through

a

circular

aperture

stop

having

a

diameter

of

7

millimeters)

1.2

CDX-M12/UC

CAUTION

This

service

manual

is

intended

for

qualified

service

technicians;

it

is

not

meant

for

the

casual

do-it-yourselfer.

Qualified

technicians

have

the

necessary

test

equipment

and

tools,

and

have

been

trained

to

properly

and

safely

repair

complex

products

such

as

those

covered

by

this

manual.

Improperly

performed

repairs

can

adversely

affect

the

safety

and

reliability

of

the

product

and

may

void

the

warranty.

If

you

are

not

qualified

to

perform

the

repair

of

this

product

properly

and

safely;

you

should

not

risk

trying

to

do

so

and

refer

the

repair

to

a

qualified

service

technician.

WARNING

Lead

in

solder

used

in

this

product

is

listed

by

the

California

Health

and

Welfare

agency

as

a

known

reproductive

toxi-

cant

which

may

cause

birth

defects

or

other

reproductive

harm

(California

Health

&

Safety

Code,

Section

25249.5).

When

servicing

or

handling

circuit

boards

and

other

components

which

contain

lead

in

solder,

avoid

unprotected

skin

contact

with

the

solder.

Also,

when

soldering

do

not

inhale

any

smoke

or

fumes

produced.

2.

DISASSEMBLY

@Case

@Extension

P.C.Board

4.Unfasten

six

screws

A

and

then

remove

the

upper

1.Unfasten

five

screws.

.

case.

2.Remove

the

connector.

2.Unfasten

four

screws

B

and

then

remove

the

lower

3.Remove

the

extension

P.C.Board.

case.

NOTE:

Be

sure

to

screw

in

order

of

1-5.

@Grille

Assy

1.Untock

four

catches

and

dismount

the

grille

assy.

\

Upper

Case

Fig.5

Fig.3

@CN351

Before

disconnecting

the

CN351

connector

(PU

unit

@Bracket

L,R

connector),

attach

a

short

as

illustrated.

1.Unfasten

eight

screws.

2.Remove

bracket

L.

3.Remove

bracket

R.

Bracket

L

yi

%

ee

si

Fig.6

Fig.4

cDxX-Mi2

@Main

Unit

1.Unfasten

four

screws.

2.Remove

the

three

connectors.

3.Remove

the

main

unit.

NOTE:

Be

sure

to

screw

in

order

of

1-4.

Fig.7

4.

ADJUSTMENT

1)

Precautions

*

This

unit

uses

a

single

power

supply

(+5V)

for

the

reg-

ulator.

The

signal

reference

potential,

therefore,

is

con-

nected

to

REFOUT

(approx.

2.5V)

instead

of

GND.

If

REFOUT

and

GND

are

connected

to

each

other

by

mistake

during

adjustments,

not

only

will

it

be

impos-

sible

to

measure

the

potential

correctly,

but

the

servo

will

malfunction

and

a

severe

shock

will

be

applied

to

the

pick-up.

To

avoid

this,

take

special!

note

of

the

fol-

lowing.

Do

not

connect

the

negative

probe

of

the

measuring

equipment

to

REFOUT

and

GND

together.

It

is

especially

important

not

to

connect

the

channel

1

negative

probe

of

the

oscilloscope

to

REFOUT

with

the

channel

2

neg-

ative

probe

connected

to

GND.

And

since

the

frame

of

the

measuring

instrument

is

usually

at

the

same

potential

as

the

negative

probe,change

the

frame

of

the

measuring

instrument

to

floating

sta-

tus.

If

by

accident

REFOUT

comes

in

contact

with

GND,

im-

mediately

switch

the

regulator

or

power

OFF.

«

Always

make

sure

the

regulator

is

OFF

when

connect-

ing

and

disconnecting

the

various

filters

and

wiring

required

for

measurements.

_

*

Before

proceeding

to

further

adjustments

and

mea-

surements

after

switching

regulator

ON,

let

the

player

run

for

about

one

minute

to

allow

the

circuits

to

stabi-

lize.

¢

Since

the

protective

systems

in

the

unit’s

software

are

rendered

inoperative

in

test

mode,

be

very

careful

to

avoid

mechanical

and

/

or

electrical

shocks

to

the

sys-

tem

when

making

adjustment.

*

When

loading

and

unloading

discs

during

adjustment

procedures,

always

wait

for

the

disc

to

be

properly

clamped

or

ejected

before

pressing

the

another

key.

Otherwise,

there

is

risk

of

the

actuator

being

destroyed.

¢

Turn

power

off

when

pressing

the

button

pm

or

the

button

haq

key

for

focus

search

in

the

test

mode.

(Or

else

lens

may

stick

and

the

actuator

may

be

damaged.)

2)Test

mode

The

model

CDX-M12

is

adjusted

in

a

combination

with

the

multiple

CD

control

head

(FH-M75,

FH-M70,

DEH-

M980RDS,

etc.).

Each

regulator

key

should

be

operated

at

the

head.

With

the

FH-M75,M70

taken

up

for

refer-

ence,

a

description

will

be

given

below

concerning

how

to

enter

into

the

test

mode,

including

key

operations.

The

key

in

the

adjustment

text

is

also

one

of

the

FH-M75,

M70

keys.

How

to

enter

into

the

test

mode

While

pressing

keys

4

and

6

at

a

time,

press

the

back-up

ON

or

clear

button

ON

the

FH-M75,

M70.

Resetting

the

test

mode

Press

the

clear

button

ON

the

FH-M75,

M70.

Subsequently

press

the

clear

button

ON

the

CDX-M12.

Or

turn

off

the

CDX-M12

and

the

FH-M75,

M70

back-up

and

wait

for

about

one

minute.

Role

to

be

played

by

each

key

in

the

test

mode

A

function

key

permits

you

to

select

the

CD

multi-play-

er

or

single

CD

player.

Peck

pid

CV

Kick

F+3

Pp

co

CT

ONE

Cd

SINGLE/10TRK/32TRK

will

continue

to

operate

even

af-

ter

the

key

is

released.

Tracking

closed

the

moment

C-

MOVE

is

released.

JUMP

MODE

resets

to

SINGLE

as

soon

as

power

is

off.

@Fiow

Chart

Glee

ae

Ge

me

<—

Reset

<Regulator

OFF>

CD

PLAYER

SELECT

<Regulator

ON>

Ganome.)

[TRK

on]

CFs

Display

Crm)

Cw)

Tracking

servo

elosed

Carriage

shifted

Carriage

shifted

outwards

while

inwards

while

this

key

is

pressed

this

key

is

pressed

aa

Spindle

kicked

while

this

key

is

pressed

Display

seni

[TRK.

OI

|

During

regulator

off,

press

the

Fe3

key

and

the

system

will

be

put

into

the

new

test

mode.

BAND/REL

<Focus

closed,

YES

tracking

open,

spindle

“rough”

servo>

BAND/REL

c

Single

—>

10TRK

C.MOVE€

32TRK

>»)

SELECT

BAND/REL

3.

BLOCK

DIAGRAM

ee

OS

EE

ee

eee

es

oe

ee

—_—

=

-

ee

-_——e

ee

oo

ES

oe

DO

MOTOR

|

DRIVER

[C801

XRAG247FP

DIGITAL

INTERFACE

BUS

LINE,

|

BSCK,

BDATA,

BRXEN,

BSRQ,

BRST

COMUTE

feet

OPTSW

NJM78L@5A

ee

Carriage

ras

:

V

—

PDS23@A

LpeVY

co

LHS116HN-10T

R+

[M5218

AL

=

Pvcc

5

C854

ie

[C854

J

2

C855.

7a

tCB54

3

5

MS218AL

C

a

s

a

=

ISOLATION

=

REFOUT

|

*

AMP

D

6

OS

:

a

ee

cq

{DATA

|

12

25

Ty

fe

—

=

vol

veux

|

13

|

Sy

=

le

—

On

DIGITAL

,

|

unex

|

41,

BAe

1S

ei

—

au

SIGNAL

EMPH

Oo

<<

H

36

=

os

q

PROEESOO

eee

[18

oS

ASV

|

16

|

o

[C701

—

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UPD6375GC

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/\

SVD

|

I

a

Be

es

ee

Sy

ee

PN

ee

a

oe

ee

Fig.

8

5

8

@

Measuring

Equipment

and

Jigs

1.

Grating

Adjustment-1

(Rough

adjustment)

*

Oscilloscope,

clock

driver,

grating

adjustment

filter

(bandpass

filter})(GGF-133),

AC

milli-voltmeter

*

SONY

TYPE

4

(or

ABEX

TCD-782)

*

Extension

Cable:GGD1023

«

DIN

Cord:GGF1159

¢

Oscilloscope,

screwdriver

*

SONY

TYPE

4

(or

ABEX

TCD-782)

*

Extension

Cable:GGD1023

+

DIN

Cord:GGF1159

2.

Tangential

Skew

Check

*

Oscilloscope,

clock

driver,

two

low-pass

filters

*

SONY

TYPE

4

(or

ABEX

TCD-782)

«

Extension

Cable:GGD1023

«

DIN

Cord:GGF1159

3.

Grating

Adjustment-1

(Fine

adjustment)

*

Oscilloscope,

grating

adjustment

driver,

low-pass

filter

*

SONY

TYPE

4

(or

ABEX

TCD-782)

¢

Extension

Cable:GGD1023

*

DIN

Cord:GGF1159

4.

Grating

Adjustment-2

*

Oscilloscope,

volume

adjustment

driver

*

SONY

TYPE

4

(or

ABEX

TCD-782)

*

Extension

Cable:GGD1023

+

DIN

Cord:GGF1159

5,

FE

Bias

Adjustment

*

Oscilloscope,

volume

adjustment

driver

*

SONY

TYPE

4

(or

ABEX

TCD-782)

*

Extension

Cable:GGD1023

+

DIN

Cord:GGF1159

*

DC

voltmeter

or

oscilloscope,

volume

adjustment

driver

*

Extension

Cable:GGD1023

«

DIN

Cord:GGF1159

*

Oscilloscope,

volume

adjustment

driver

*

SONY

TYPE

4

(or

ABEX

TCD-782)

*

Extension

Cable:GGD1023

+

DIN

Cord:GGF1159

6.

RF

Offset

Adjustment

7.

TE

Offset

Adjustment-1

8.

Tracking

Balance

Adjustment-1

*

Oscillator,

gain

adjustment

filter

(GGF-065),

oscilloscope,

dual

meter

milli-voltmeter,

volume

adjustment

driver

*

SONY

TYPE

4

(or

ABEX

TCD-782)

«

Extension

Cable:GGD1023

*

DIN

Cord:GGF1159

9.

Focus

Servo

Loop

Gain

Adjustment-1

*

Oscillator,

gain

adjustment

filter,

oscilloscope,

volume

adjustment

driver

*

SONY

TYPE

4

(or

ABEX

TCD-782)

*

Extension

Cable:GGD1023

*

DIN

Cord:GGF1159

10.

Focus

Servo

Loop

Gain

Adjustment-2

¢

Oscillator,

gain

adjustment

filter

(GGF-065),

oscilloscope,

dual

meter

milli-voltmeter,

volume

adjustment

driver

*

SONY

TYPE

4

(or

ABEX

TCD-782)

¢

Extension

Cable:GGD1023

«

DIN

Cord:GGF1159

11.

Tracking

Servo

Loop

Gain

Adjustment-1

*

Oscillator,

gain

adjustment

filter,

oscilloscope,

volume

adjustment

driver

*

SONY

TYPE

4

(or

ABEX

TCD-782)

*

Extension

Cable:GGD1023

«

DIN

Cord:GGF1159

12.

Tracking

Servo

Loop

Gain

Adjustment-2

*

DC

voltmeter

or

oscilloscope,

volume

adjustment

driver

*

Extension

Cable:GGD1023

+

DIN

Cord:GGF1159

13.

TE

Offset

Adjustment-2

10

14.

Checking

FEY

Level

15.

Tracking

Balance

Adjustment-2

And

Checking

TEY

Level

+

Measuring

equipment&jigs

*

Oscilloscope

“Gig

Ae

*

SONY

TYPE

4

(or

ABEX

TCD-782)

ange

*

Extension

Cable:GGD1023

+

DIN

Cord:

GGF1

159.

Oe

*

Oscilloscope,

volume

adjustment

driver

*

SONY

TYPE

4

(or

ABEX

TCD-782)

«

Extension

Cable:GGD1023

+

DIN

Cord:

GGF1

159

ard

*

@

Adjustment

Points

DIN

Cord

GGFN59

.

ower

Supp

R>

CO

S

BSc

Roe

~

Extension

Cable

GGD1023

VR351

|

FE

BIAS

VR352_

|

RF

OFFSET

VR353_|

TE

OFFSET

VR354

|;

TRACKING

BALANCE

VR355_

|

FOCUS

SERVO

LOOP

GAIN

VR356

|

TRACKING

SERVO

LOOP

GAIN

P.C.B

Note:

Main

Unit

PU

Unit

gee

a

Ze

VR352

VR351

Fig.

9

When

pulling

out

the

connector

CN351,

be

sure

to

install

a

short

in

section

A.

Alternatively,

the

land

in

section

B

may

be

short-circuited

(by

sol-

dering

or

the

like).

When

the

connector

is

in-

sterted,

be

sure

to

disconnect

it

before

the

power

is

turned

on.

11

@Test

Point

gf

a

ml

eee

2

|

eo

i

ie

Heaueit

a

oe

(OE

ea

Suwa,

ig,

Fig.

10

:

12

1

Grating

Adjustment-1

(Rough

adjustment)

*

Grating

Adjustment-1

(rough

adjustment

and

fine

adjustment)

may

be

performed

in

Grating

Adjustment-

2

¢

Purpose:

The

grating

may

need

adjustment

in

a

replaced

pick-

up

unit.

+

Maladjustment

symptoms:

No

disc

playback,

track

jumping.

«

Measuring

equipment

/

jigs:

Oscilloscope,

clock

driver,

grating

adjustment

filter

(bandpass

filter)

(GGF-133),

AC

milli-voltmeter

*

Measuring

point:

TEY

*

Test

disc

and

setting:

SONY

TYPE

4

(or

ABEX

TCD-782)

Test

mode

¢

Adjustment

position:

Pick-up

grating

adjustment

hole

MAIN

UNIT

Oscilloscope

Adjustment

Procedure

1.

In

the

test

mode,

set

a

test

disc-loaded

magazine

and

select

the

tray

with

a

test

disc.

2.

Switch

regulator

ON

.

3.

Using

the

pm

or

me

key,

move

the

pick-up

to

about

the

center

of

the

test

disc.

4.

Press

the

Fe2

key

to

close

focus.

5.

While

monitoring

the

TEY

filter

output

by

AC

milli-

voltmeter,

turn

the

grating

adjustment

hole

slow-

ly.The

AC

voltage

increases

and

decreases

while

turning

the

screw.

Search

for

the

minimum

volt-

age

level.

(This

corresponds

to

the

position

where

the

grating

is

on

a

track,

and

is

referred

to

as

the

null

Point.)

6.

Then

while

monitoring

TEY

by

oscilloscope,

turn

the

driver

slowly

clockwise

from

the

null

point

(as

seen

from

under

the

pick-up)

until

the

first

wave-form

peak

amplitude

is

reached.

COoxX-Mi2

2

Tangential

Skew

Check

¢

Purpose:

To

check

whether

tangential

skew

has

been

misaligned

or

not

when

replacing

the

pick-up

unit.

*

Maladjustment

symptoms:

No

disc

playback,

track

jumping.

*

Measuring

equipment

/

jigs:

Oscillosope,

screwdriver

¢

Measuring

point:

RFO°

*

Test

disc

and

setting:

SONY

TYPE

4

(or

ABEX

TCD-782)

Normal

mode

¢

Adjustment

position:

Pick-up

tangential

adjustment

screw

MAIN

UNIT

Oscilloscope

REFOUT

C4

i

0.1nS

/

div.

0.5

V/div.

RFO

AC

mode.

Adjustment

Procedure

1,

Play

tune

TNO

12

in

normal

mode.

(ABEX

TCD-

782:TNO19)

2.

Adjust

the

tangential

adjustment

screw

so

that

the

RF

wave-form

will

have

a

level

maximized

and

an

eye

pattern

clearly

viewed.

Turn

the

adjustment

screw

both

clockwise

and

counterclockwise

to

points

where

the

eye

pattern

deteriorates,

and

take

the

midway

point

as

the

adjustment

point.

As

a

general

guide,

look

for

an

overall

clear

waveform,

and

one

of

the

diamond

shapes

in

the

eye

pattern.

The

diamond

shapes

should

appear

in

fine

lines

at

the

point

of

optimum

adjust-

ment.

Take

care

not

to

knock

the

pick-up

with

the

screwdriver

at

this

stage.

(This

kind

of

accident

can

result

in

loss

of

focus.)

(See

Waveform.1,2)

3

Apply

“screw-lock"

to

the

tangential

adjustment

screw.

4.

After

adjusting

tangential

skew,

also

adjust

the

grat-

ing.

13

cDx-Miz2

3

Grating

Adjustment-1(Fine

adjustment)

¢

Purpose:

The

grating

may

need

adjustment

in

a

replaced

pick-

up

unit.

«Maladjustment

symptoms:

No

disc

playback,

track

jumping.

¢

Measuring

equipment

/

jigs:

Oscilloscope,

clock

driver,

two

low-pass

filters

¢

Measuring

point:

E

LPF

output,

F

LPF

output

*

Test

disc

and

setting:

SONY

TYPE

4

(or

ABEX

TCD-782)

Test

mode

«

Adjustment

position:

Pick-up

grating

adjustment

hole

Waveform.1

MAI

N U N

IT

Oscilloscope

X

20mvV

/

div.

Y

20mV

/

div.

5mS

/

div.

Waveform.2

0.5V/div.

Adjustment

Procedure

0.5ys/div.

.

Connect

a

low-pass

filter

as

shown

in

the

above

di-

DC

mode

agram.

.

Switch

regulator

ON

in

test

mode,

and

load

a

disc.

.

Using

the

>>

or

ie

key,move

the

pick-up

to

about

the

center

of

the

test

disc.

.

Press

the

Fe2

key

to

close

focus.

.

Using

the

driver,

adjust

the

Lissajous

figure

to

a

sin-

gle

line

(or

as

close

as

possible).

(See

Waveform.8

)

.

Switch

regulator

OFF

and

remove

the

filters.

14

CDxX-Mi2

Waveform.4

Waveform.6

Waveform.8

Horizontal

axis

E

20mV/div.

Vertial

axis

F

20mV/div.

=

Ss

a

=

oO

=<

©

—

3

a

=

a

>

2

oe

wn

2

a

500mV/div.

Waveform.3

Waveform.5

Waveform.7

t

TEY

waveform

5ms/div.

5

ams/DIV

W/DEV,

2.5

4

Grating

Adjustment-2

«

Grating

Adjustment-2

may

be

performed

ih

Grating

Adjustment-1

(rough

adjustment

and

fine

adjust-

ment).

*

Purpose:

The

grating

may

need

adjustment

in

a

replaced

pick-up

unit.

+

Maladjustment

symptoms:

No

disc

playback,

track

jumping.

+

Measuring

equipment

/

jigs:

Oscilloscope,

grating

adjustment

driver,

low-pass

filter

¢

Measuring

point:

TEY

«Test

disc

and

setting:

SONY

TYPE

4

(or

ABEX

TCD-782)

Test

mode

¢

Adjustment

position:

Pick-up

grating

adjustment

hole

MAIN

UNIT

Oscilloscope

REFOUT

Adjustment

Procedure

.

Inthe

test

mode,

set

a

test

disc-loaded

magazine

and

select

the

tray

with

a

test

disc.

.

Switch

regulator

ON

.

Using

the

prior

mea

key,

move

the

pick-up

to

cen-

ter

of

the

test

disc.

.

Press

the

Fe2

key

to

close

focus.

.

Insert

the

adjusting

screwdriver

in

the

slit

for

the

pick-

up

grating

adjustment

and

adjust

the

grating

to

seek

out

the

null

point.

For

details,

see

following

page.

.

As

the

screwdriver

is

slowly

turned

clockwise

from

the

null

point,

the

amplitude

of

the

waveform

in-

creases

gradually.

As

the

screwdriver

continues

to

be

turned,

the

amplitude

of

the

waveform

decreas-

es

again.

Adjust

the

grating

to

a

point

at

which

the

amplitude

of

the

waveform

first

reaches

the

maxi-

mum

while

the

screwdriver

is

turned

clockwise

from

the

null

point.

16

@

How

to

seek

the

null

point

When

the

screwdriver

is

inserted

in

the

slit

for

grating

adjustment

while

the

angle

of

the

grating

is

varied,

the

ampli-

tude

of

the

TEY

tracking

error

signal

varies.

There

are

5

or

6

positions

where

the

amplitude

of

the

waveform

is

decreased

in

the

grating

variable

range.

In

only

one

of

the

waveform

amplitude

diminishing

positions,

the

envelope

is

made

smooth

.

This

position

denotes

the

State

where

three

laser

beams

divided

by

the

grating

are

aligned

right

on

the

same

track.

This

position

is

referred

to

as

the

null

point.

Adjust

the

grating

to

seek

out

the

null

point

which

is

used

as

a

refer-

ence

position

in

performing

the

grating

adjustment.

Turn

the

grating

Turn

the

grating

clockwise.

counterclockwise.

{

Waveform

of

TP

1,

2

=

oo

|

ruil

MT

Ni

if

mt

7

Grating

adjustment

—_—Null

point

position

~~

Waveform

at

null

point

Waveform

of

maximum

Waveform

in

positions

amplitude

other

than

null

point

17

cpx-Mi2

5

FE

Bias

Adjustment

(

¢

Purpose:

To

adjust

the

focus

servo

bias

to

an

optimum

value.

+

Maladjustment

symptoms:

nee

:

Focus

closing

difficulty,

poor

playability.

.-~

«

Measuring

equipment

/

jigs:

Oscilloscope,

volume

adjustment

driver

«Measuring

point:

RFO

¢

Test

disc

and

setting:

SONY

TYPE

4

(or

ABEX

TCD-782)

Norma!

mode

«

Adjustment

position:

VR351

(FEB)

aaa

MAIN

UNIT

Waveform.9

Oscilloscope

REFOUT

=

0.5nS/

div.

0.5V

/

div.

RFO

level

(Vp-p)

—REFOUT

OK

Waveform.10

Adjustment

Procedure

1.

Play

tune

TNO

12

in

normal

mode.(ABEX

TCD-782:TNO

0.5V/div.

19)

0.5ys/div.

DC

mode

2.

Observe

RFO

in

respect

to

REFOUT

in

the

oscillo-

scope,

and

adjust

VR351

(FEB)

to

obtain

maximum

RF

and

optimum

eye

pattern.(See

Waveform.

9,10)

3.

After

adjustment,

measure

the

RFO

output

level

shown

in

Waveform.10

and

take

actions

shown

below.

Output

level

2.8Vp-p

more

than

Replace

the

pick-up

1.2Vp-p

-

2.6Vp-p

1.2Vp-p

less

than

Replace

the

pick-up

NG

OK

NG

18

6

RF

Offset

Adjustment

*

Purpose:

To

adjust

the

RF

amplifier

offset

to

a

suitable

value.

«

Maladjustment

symptoms:

Focus

closure

fails

readily.

*

Measuring

equipment

/

jigs:

Oscilloscope,

volume

adjustment

driver

¢

Measuring

point:

RFO

¢

Test

disc

and

setting:

SONY

TYPE

4

(or

ABEX

TCD-782)

Normal

mode

«

Adjustment

position:

VR352

(RFO)

MAIN

UNIT

Oscilloscope

REFOUT

1mS

/

div.

0.5V

/

div.

OC

mode

When

using

a

multi-channel

oscilloscope,

do

not

connect

the

other

negative

probe

to

ground.

Adjustment

Procedure

1.

Play

tune

TNO

12

in

normal

mode.(ABEX

TCD-782:TNO

19)

2.

Using

VR352

to

adjust

the

RFO

waveform

so

that

REFOUT

appears

at

the

center.(A-B

must

not

exceed

100

mV.)

REFOUT

7

TE

Offset

Adjustment-1

¢

Purpose:

To

adjust

the

electrical

offset

of

the

tracking

servo

to

zero.

3

.

*Maladjustment

symptoms:

|

Search

times

too

long,

carriage

run-away.

*

Measuring

equipment

/

jigs:

DC

voltmeter

or

oscilloscope,

volume

adjustment

driv-

er

«

Measuring

point:

TEY

*

Test

disc

and

setting:

Enpty

magazine

Test

mode

«Adjustment

position:

VR353

Oscilloscope

MAIN

UNIT

REFOUT

=

20mV/

div.

[|

1ImS

/

div.

DC

mode

Adjustment

Procedure

1.

Select

a

tray

without

a

disk,

while

in

test

mode.

2.

Switch

regulator

ON.

3.

Using

VR353,

adjust

the

TEY

output

DC

voltage

in

ref-

erence

to

REFOUT

to

a

value

of

0£25mvV.

4.

Switch

regulator

OFF.

19

8

Tracking

Balance

Adjustment-1

TEY

waveform

0.5V/div.

10ms/div.

¢

Purpose:

To

adjust

the

tracking

servo

offset

to

zero.

«

Maladjustment

symptoms:

Search

times

too

long,

poor

playability,

carriage

run-

hewiay,

*

Measuring

equipment

/

jigs:

Oscilloscope,volume

adjustment

driver

¢

Measuring

point:

TEY

(Tracking

error

signal)

*

Test

disc

and

setting:

SONY

TYPE

4

(or

ABEX

TCD-782)

Test

mode

-

Adjustment

position:

VR354

(T.BAL)

MAIN

UNIT

Oscilloscope

REFOUT

Waveform.

12

Adjustment

Procedure

1.

After

checking

that

regulator

is

OFF,

connect

the

low-

pass

filter

as

shown

in

the

diagram.

2.

Set

the

test

disc.

Switch

regulator

ON.

3.

Using

the

pm

or

Ha

key,

move

the

pick-up

to

about

the

center

of

the

signal

surface.

4.

Press

the

Fe2

key

to

close

focus.

5.

Using

an

oscilloscope,

observe

the

TEY

signal

in

re-

spect

to

REFOUT.

Then

adjust

VR354

(T.BAL)to

set

the

positive

and

negative

amplitudes

to

the

same

levels.

(See

Waveform.11-13)

.

Switch

the

power

OFF.

v_1Oma/O1V

Waveform.11

Waveform.

13

T

ais

REFOUT

DC

component

overlapped

NG

u

A=B

>

REFOUT

|

OK

DC

component

eliminated

>a

A+B

REFOUT

B

|

DC

component

overlapped

9

Focus Servo

Loop

Gain

Adjustment-1

*

Focus

Servo

Loop

Gain

Adjustment-1

may

be

per-

formed

in

Focus

Servo

Loop

Gain

Adjustment-2.

~

.©

Purpose:

.

3

:

To

adjust

the

focus

servo

loop

gain

to

an

optimum

val-

ue.

aa

*

Maladjustment

symptoms:

Poor

playability,

reduced

resistance

to

vibration,

fo-

cus

closure

fails

readily.

*

Measuring

equipment

/

jigs:

Oscillator,

gain

adjustment

filter

(GGF-065),

oscilloscope,

dual

meter

milli-voltmeter,

volume

adjustment

driver

¢

Measuring

point:

FEX,

FEY

*

Test

disc

and

setting:

SONY

TYPE

4

(or

ABEX

TCD-782)

Normal

mode

*

Adjustment

position:

VR355

Oscillator

Oscilloscope

1mS

/

div.

50mV

/

div.

AC

mode

Dual

meter

milli-voltmeter

Gain

Adj.

ally

z

-065

ve

foc

—

Note

:

Leave

the

negative

side

of

the

other

oscilloscope

channel

open.

Connect

the

negative

millivoltmeter

lead

to

REFOUT,

and

do

not

connect

REFOUT

to

the

power

supply

ground.

MAIN

UNIT

Adjustment

Procedure

1.

After

checking

that

the

power

is

OFF,

connect

the

gain

adjustment

filter

and

measuring

equipment

as

shown

in

the

above

diagram.

.

Play

tune

TNO

12

in

normal

mode.(ABEX

TCD-782

:TNO

19)

.

Set

the

oscillator

to

1kHz,and

observe

the

FEX/FEY

output

in

the

oscilloscope.

Adjust

the

oscillator

out-

put

to

obtain

a

FEX/FEY

output

of

100mVp-p.

.

Adjust

VR355

to

obtain

a

milli-voltmeter

difference

of

0+0.5dB.

CoxX-Mi2

10

Focus

Servo

Loop

Gain

Adjustment-2

¢

Purpose:

To

adjust

the

focus

servo

loop

gain

to

an

optimum

value.

¢

Maladjustment

symptoms:

Poor

playabillity,

reduced

resistance

to

vibration,

fo-

cus

closure

fails

readily.

¢

Measuring

equipment

/

jigs:

Oscillator,

gain

adjustment

filter,

oscilloscope

¢

Measuring

point:

FEX,

FEY

*

Test

disc

and

setting

SONY

TYPE

4

(or

ABEX

TCD-782)

Normal

mode

«

Adjustment

position:

VR355

Oscilloscope

MAIN

UNIT

X-¥

mode

Adjustment

Procedure

1.

After

checking

that

the

power

is

OFF,

connect

the

gain

adjustment

filter

and

measuring

equipment

as

shown

in

the

above

diagram.

.

Play

tuneTNO

12

in

normal

mode.(ABEX

TCD-782:TNO

19)

.

Set

the

oscillator

at

1kHz

and

adjust

the

output

of

the

oscillator

to

2Vp-p.

.

Adjust

VR355

to

make

the

Lissajou's

figure

of

wave-

form

symmetrical

about

X

and

Y

axes

respectively.

21

.

CDX-Mi2

11

Tracking

Servo

Loop

Gain

Adjustment-1

*

Tracking

Servo

Loop

Gain

Adjustment-1

may

be

per-

formed

in

Tracking

Servo

Loop

Gain

Adjustment-2.

«Purpose:

7

To

adjust

the

tracking

servo

loop

gain

to

an

optimum

value.

¢

Maladjustment

symptoms:

High-level

Poor

playability,

reduced

resistance

to

vibration.

gain

«Measuring

equipment

/

jigs:

Oscillator,

gain

adjustment

filter(GGF-065),

oscilloscope,

dual

meter

milli-voltmeter,

volume

adjustment

driver

*

Measuring

point:

TEX,

TEY

*

Test

disc

and

setting:

SONY

TYPE

4

(or

ABEX

TCD-782)

Norma!

mode

¢

Adjustment

position:

VR356

Focus

X=0.5V/div.

Y=50mV/div.

Ims/div.

Waveform.14

Oscilloscope

Oscillator

1mS

/

div.

50mvV

/

div.

AC

mode

14.4V

Dual

meter

milli-voltmeter

Gain

Adj.

Filter

Optimum

GGF-065

gain

REFOUT

Note

:

Leave

the

negative

side

of

the

other

oscilloscope

channel

open.

Connect

the

negative

millivoitmeter

lead

to

REFOUT,

and

do

not

connect

REFOUT

to

the

power

supply

ground.

MAIN

UNIT

Waveform.15

Adjustment

Procedure

1.

After

checking

that

the

power

is

OFF,

connect

the

gain

adjustment

filter

and

measuring

equipment

as

shown

in

the

above

diagram.

2.

Play

tune

TNO

12

in

normal

mode.(ABEX

TCD-

782:TNO19)

3.

Set

the

oscillator

to

1.4kHz,

and

observe

the

TEX/TEY

output

in

the

oscilloscope.

Adjust

the

oscillator

out-

put

to

obtain

a

TEX/TEY

output

of

300mVp-p.

4.

Adjust

VR356

to

obtain

a

milli-voitmeter

difference

of

0+0.5dB.

Low-level

gain

Waveform.

16

22

Pioneer CDX-M12 User manual

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