Sanyo MCD-Z1F User manual

/1/11 i

Service Manual ——.

Portable CD /

AM /FM Stereo /

Cassette Recorder

FILE NO. “-- ‘1

MCD-ZI F(AU)

.“..

..-?

.—. .

Specifications

.-. .

,..../:

.-.

(CASSEITE SECTION )

Recording system . . . . AC bias, 4track stereo

Erasing system . . . . . . Magnet erase

Tape speed .......-. 4.75 cm Isec.

Fast forward and

rewind time ......... I I osec. (C-60 tape)

Frequency response . . 80- 12.000 HZ (Normal tape)

(CD SECTION )

Channels ........... 2channels

S/ Nratio .........-. 70dB

wow &Flutter .....-. undetectable

Sampling frequency ... 44.1 kHz

Quantization ....----- 16 bits linear 1ch

Pick-up light source .-. Semi-conductor laser

Pick-up wave length ... 790 nm

Specifications subject to change without notice.

(RARE(3 SECTION )

Tuning ranges ....... FM: 88- 108 MHz

AM :525-1,710 kHz

Antennas ........... Built-in ferrite bar and

telescopic rod antennas

(GEMERAL )

Outm power . . . . . . . . 4.0 Wx2(DC max.)

Speaker . . . . . . . . . . . . 12cmx2140hms

Terminal impedance . . pHONES :32 ohms

Powem source . . . . . . . . AC :230-240 V, 50 Hz

DC: 12V

(8x“D “size batteries)

Dimensions . . . . . . . . . 556( W)x170(H)x210(D)m

Weight . . . . . . . . . . . . . Approx. 3.4 kg including batteries

REFERENCE No. SM580195

..- -

LASER BEAM SAFETY PRECAUTIONS

.Pick-up that emits alaser beam is used in this CD player.

-. d

CAUTION :

USE OF CONTROLS OR ADJUSTMENTS

OR PERFORMANCE OF PROCEDURES

OTHER THAN THOSE SPECIFIED

HEREIN MAY RESULT IN HAZARDO

RADIATION EXPOSURE

LASER OUTPUT ........0.6 mw Max.

WAVELENGTH ...........7’90 nm

REMOVAL AND INSTALLATION

.Disconnect the power cord’s plug from the electrical outlet.

.All wiring should be returned to the original position after work is completed.

.First have ready many the new FIXERS (614 129 4971) for replacement.

●Arrange the lead “wires so that they are not near the heat sink.

.,.,.

a. CABINET

(1) Remove the battery lid.

(2) Remove the 7rear cabinet

mounting screws. (})

b. TOP PANEL

(1) Remove the 4top panel

mounting screws.

(2) Remove the top panel.

(3) Remove the chuck pulley.

-1-

.........

REMOVAL AND INSTALLATION

c. “O” POINT ADJUSTMENT

-o-mm-r

&\ &

\\* /6 “

\\.IL

FOINIER -\

...-

.“ -.-4

. .

.. TAPE DECK ADJUSTMENTS

a. HEAD REPLACEMENT

.After replacement, demagnetize the heads by

using adegausser.

●Be sure to clean the heads before attempting

. .

d. ROD ANTENNA TERMINAL

-. d

to make any adjustments.’

●All wiringshould be returned to the original position

after work is corn-pleted.

. .

,-.

Irisert the test tape (MTT-111 N, etc., 3000 Hz )into

tape deck.

Press tape deck PLAY button.

Adjust SVR so that the frequency counter shows are

.3’ -. .-

.: ..,,

b. MOTOR SPEED ADJUSTMENT

(1)

(2)

(3) reading of 3,000 Hz.

.WHIT Ow

14’#1

. .

.>.

TORQUES AND TENSION

c. CHECKING THE

.Clean the head, capstan and pinch roller before making any measurement.

Measurement Take-up torque Back tension Tape tension 1

Cassette for PLAY:TW-2111A Drive-power cassette

PLAY:TW-21 11A

measurement F.FwD/REw:TW-2231 TW-2412

PLAY 30-60 gr.cm 2.0- 4.5 gr.cm 60gr or more

F.FWD 55-120 gr.cm

REW 55-120 gr.cm

-2-

CD PLAYER ADJUSTMENTS

a. DISASSEMBLY OF THE CD PLAYER MECHANISM

(a) Replacement of the spindle motor

●First, prepare the new turntable (Ml -2 )and new special

washer (Ml -4 )for replacement.

The removed turntable will be deformed by the heat of the

soldering iron, and cannot be reused.

.Prepare dial type calipers.

(1)

(2)

(3)

(4)

(5)

(6)

,(7)

(b)

(1)

(2)

(3)

(4)

(5)

(6)

The attached bonding material can be dissolved by using a

60W soldering iron to heat the shaft at the lower part of the

turntable (Ml-2 )for about one minute.

The turntable can then be removed from the shaft by very

carefully applying force upward at the center of the lower

surface of the turntable.

Remove the two screws (Ml-3 )and remove the spindle

motor (Ml-5 ).

Attach the special washer (Ml-4 )to the spindle motor.

Apply asmall amount of amixture of the “Three Bond 2001”

and “201 5F” bonding materials to the motor’s shaft.

Install the turntable as shown in the figure.

Secure the turntable by pressing gently.

Be sure to wipe away (by using apiece of cloth, or similar

material )any bonding material coming out of the hole.

Replacement and lubrication of the pick-up

Before replacement of the pick-up, be sure to carefully read

the section regarding the pick-up when the unit is moved or

transported.

Remove the two pick-up rail (Ml 2)with care fixing the two

latch with any way driver from bottom of chassis

(Ml-1 ).

If the pick-up is reconditioned or replaced, be sure to wipe

the rails clean and also apply acoating of FLOIL

their entire circumference and entire length. (G-474B )to

After replacement, install the shaft as before.

The pick-up P.C.Board pattern is “shorted”, as shown in the

figure ,so that the new pick-up will not be susceptible to the

effects of static. .

Set the pattern to “OPs?tI” afler the pick-up has been

replaced.

SHORT

OPEN

f!9-

-d” “.

.Ml-5

Don’t attached bonding material

at the top of shaft

b@ending material

I~p~

—.——. MI-4

8-I&m (-CM wASHER)

——

Ml-1

(CHASSIS)

Be sure to wipe away the

bonding mateariat CHUCK PULLEY

,.. ,.

II MOTOR SHAFT)

v’ I** 4—

M12

-3-

...

.-,...,.

.CD PLAYER ADJUSTMENTS

/- +f?

(BE SURE, AT THIS TIME, NOT

TO TOUCH ANY OTHER PART. )mm

(c)

(1)

(d)

(1)

(2)

...-. (3)

(4)

(5)

(6)

(7)

(e)

(1)

(2)

.’.-.:..,

...’ .- ..

Sled motor replacement (BE SURE. AT THIS TIME, NOT

See illustration at right. TO TOUCH ANY OTHER PART. )

Checking the operation of the CD mechanism

Disconnect the socket (for the sled motor power supply) from

the printed-circuit board.

Apply avoltage of DC 2.0 Vto the sled motor’s Ml-1

terminal.

Measure the current during sled motor operation.

●The direction of movement of the pick-up (outer groove or

inner groove) can changed by changing the battery polarity.

The current during sled motor operation varies

according to the positional relationship of gears

(M8and M9). .

If the current exceeds 40 mA ,remove the

pipe (M7 )and gears (M8, M9 ).

Apply asmall amount of’s FLOIL (G-474B )bonding

materials to the chassis shafts. ‘-’

Install the pipe and gears as shown in the illustration.

.. .

. . . .. . . .

M? M8

Resetting the pick-up to the home position

The limit switch is switched ON by the projection of the rack

gear secured to the returned pick-up, afler which the sled

motor continues to operate (by the circuit) for approximately

20-30 milliseconds ;there is then again areverse

operation, and movement to the position at which the switch

is switched OFF.

Rotation continues for about 20-30 milliseconds after the

switch is switched OFF, and then the pick-up stop at home

position.

..- . .

-4-

--u

Mll —

Direction of pick-up movement Sled motor current

Outer groove 40 mA or less

.Inner groove 40 mA or less

.- .. . -- Ma

“9

--- $B

LIMIT

SWITCH

‘-- PICK-

.-..

CD PLAYER ADJUSTMENTS

b. PREPARATIONS ./

(a) Measuring instruments, tools and filter

(1)

(2)

(3)

(4)

Test disc. :YEDS 18 (SONY )or etc.

Oscilloscope :SS5711

(1OMHz or dual-phenomenon )

or Memory scope :DSS6521 (Storagescope)

DC digital voltmeter (Input impedance

1Mohm or more )

AC voltmeter (- 80 dB, input impedance

(5) AF oscillator (400 Hz, 300 mV RMS )

(6) Frequency counter (5 MHz ;or more )

and probe (10 :1)

(7) Screwdrivers (non-metallic )for adjustments

(8) Low Pass Filter (L.P.F. )

(9) DC Power supply :12 V, 1A

1Mohm or more)

(b) Component locations diagram

●Work can be simplified by removing

the printed circuit boards from the CD mechan

and placing then as shown in the illustration.

.Place the CD mechanism on aflat and level su

to operate it.

POWER SWITCH

‘-. CN951

..!, .,

.. . ..

..-.

c. PARTS LOCATION

“’””--.-A- \

.’. .

kCN402

)

CN403

CN404

TP2

Vc B

SVR302

TP 1

❑

TP4

Zzl

GND

TP5

@TP3

‘L’ tzz

E==R=a

CN301 1

-5-

..- . ... . . .

CD PLAYER ADJUSTMENTS

.- .,

.:.

., .,,

.. .,

Adjustment Measuring Short- Input output

Item circuit

instrument connection connection

location

(a) PLLVCO Frequency counter SHORT 1TP 5(PLL)

—

free-run TP 4(GND)

Adjust-

ment

location

--- .A

Adjustment value

4.300 MHz -5.000 MHz

Waveform symmetry

A=B 1.5 Vp-p

Check be sure that the

“eye” pattern is at the

center of the waveform

and that the diamond

ShaDe is clearlv defined

SVR302

(b) Tracking Oscilloscope

L.P.F. SHORT 1TPI:TE

—

balance TP 2: VC2.5V

the “eye” Oscilloscope TP3:RF

—

pattern TP 2: VC2.5V —

d. ADJUSTMENTS

(1)

(2)

(3)

)PLL VCO free-run adjustment

Test disc removed from the unit. TP5 ~

Short-circuit points 1 on the printed-circuit board.

Connect afrequency counter to TP 5(PLL )and

TP 4(GND ). TP4 ~

Switch ON the DC power (12.O,V ). . .-

FREQUENCY

COUNTER

(4) (See component locations diagram at page 5)

Check the reading of the frequency counter !.

is 4.300 MHz -5.000 MHz. ‘“ .

Cancel the short-circuiting of short-circuit point 1~‘~“~”-

on the printed-circuit board. -..’. ... ,”,

.,1, ~~ L.P. F.

(5)

(6)

-..

(b)Tracking balance adjustment ‘TP1<~~~ +I

(1)

(2)

(3)

(4)

(5)

(6)

Short-circuit points 1 on the printed-circuit ward..,,. ;. . .“ ..

Connect an oscilloscope to 1P 1(TE) and TP 2(VC 2.5V).~Y ;~-:--,y.-, IN -

‘-’”-- 3;

Switch ON the DC power. ‘------- .. ...... .. -—.---..-–.-.--12- .~p ~.-... -

Set the test disc. -1

PLAY switch push ON.

OSCILLOSCOPE

Cancel the short-circuiting of short-circuit point 1

on the printed-circuit board.

Adjust SVR302 so that the oscilloscope’s waveform is .

symmetrical, as shown in the illustration.

Switch OFF the DC power.

Ov 1.5vp-p

1VIDIV h-g

(7)

(8)

●The adjustments (a) -(b) complete the adjustments of

the CD player.

Next, check the eye pattern waveform. ‘p’ 1 OsclLLOscOpE

)Checking the eye pattern +~

Switch ON the DC power.

Connect an oscilloscope to TP 3(RF) and

TP 2(VC 2.5V ).

Load the test disc.

PLAY switch push ON.

Check to be sure that the “eye “pattern is at the center

of waveform and that the diamond shape is clearly defined.

Press the STOP button.

Switch OFF the DC power.

(1)

(2) I

(3)

(4)

(5) 0

(6)

(7) H-ttni-ti-n AA/

-6-

... -

TUNER ADJUSTMENTS

●use aplastic screw driver for adjustments.

.Adjust the intermediate frequency of AM and FM to the frequency of ceramic filter. -.. 4

Supply voltage :DC12.OV

Phones impedance :32 ohm

Standard output :0.5 mW (126 mV)

Function switch :RADIO

TONE controls :HIGH

PARTS LOCATION

. . . . . .

2-,. .,-..!

., ..,-, ._.... :r-

a. AM ADJUSTI

FR=

1IF

2Tuning

3coverage

4Tracking

/ \

b-- “.“

[

‘5’‘aq-

VCT-2@

@vc?-

HLOO

LO02

T104

“ml IEil ‘ll-

“;TP2

cg9 (E)

*] @vR201 -;“’ .

I...’

5“’

.. ....

,,..

TP1” ‘: ‘-” -,

tu\

J‘. -,

—-. ..— j

IENT BAND SELECT SWITCH :AM

,-.

\Conne

Input

Closed the output

terminal by sweep

generator, it place

to LO05.

Connect AM SG

to Test Loop

Connect AM SG

to Test Loop

tions VTVM

SG Frequency position of tuning dial Adjustment

output Oscilloscope

Connect sweep II

generator to

C109(H) &R202(G) 455 kHz Low

T104 -4-

Connect VTVM to 517kHz Low end LO06

speaker terminals Max.

1750kHz High end VCT -4

Connect VTVM to 600 kHz 600 kHz LO05

speaker terminals Max.

1400 kHz 1400 kHz VCT -3

GlRepeat adjustments

-..

-7-

...,.,.,.

.... TUNER ADJUSTMENTS

b.FM ADJUSTMENT BAND SELECT SWITCH :

Adjusting Connections

Step Circuit Input output

Connect sweep Connect sweep

1IF generator to generator to

Icool Q1 (H} RO04 (H)

&TP 2(G) &R202 (G)

2Tuning Connect FM SG Connect VTVM to

3toTPl (H) &TP2 (G) speaker terminals

coverage

4Tracking Connect FM SG Connect VTVM to

toTPl(H)&TP2(G) speaker terminals

I11

5ReDeat adjustments

‘M FM Dummy antenna: 750hm

SG Frequency Position of tuning dial Adjustment

10.7 MHz Low T103

87.0 MHz Low end LO02

109.0 MHz High end VCT-2

98.0 MHz 98 MHz VCT-1

rebalance

‘- Ilfvh.1

Oscilloscope

Max.

.-,.....

:..

c. FM VCO ADJUSTMENT BAND SELECT SWITCH :FM

(1) Input signal :60 dB 22.5kHz Non-modulation. at 98.0 MHz

Connection :Hot to TP-1, Ground to TP-2

Pilot signal :OFF

(2) Adjustment: VR201

FREQUENCY :76.00 kHz ~0.15 kHz

●FREQUENCY COUNTER SENSIBILITY :HIGH LEVEL (more than 20 mV p-p )

.Adjust VR201 so that the frequency counter shows are reading of 76.00 kHz +0.15 kHz. ‘.

.. .

‘, ~,-.,

..- ‘. -~. .’

: ;

“.-... . ..

-8-

-,, ,-

>-: ~,,

. .

..-

EXPLODED VIEW (CABINET &CHASSIS)

$2+5!!!233.*

/,’2? ‘.x%-“ ,J=Q2

15 Yll U3 1uo~ Iw%$

-9-

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