Sanyo MCH-900F Bedienungsanleitung

Service Manual CD Portable

FM Stereo/AM

Cassette Recorder

Specifications

(CASSETTE SECTION )

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

Erasing system ....... Magnet erase

Tape speed .......... 4.75 cm /sec.

Fast forward and

rewind time .......... 110 sec. (C-60 tape)

Frequency response . . . 80-12,000 Hz (Normal tape)

(CD SECTION )

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

SIN ratio ........... 70dB

Wow &Flutter . . . . . . . . undetectable

Sampling frequency . . . 44.1 kHz

Quantization ......... 16 bits linear /ch

Pick-up light source .Semi-conductor laser

Pick-up wave length .790 nm

Laset output ......... Continuous wave

max. 0.6 mW

Specifications subject to change without notice.

(RADIO SECTION )

Tuning ranges .........

Antennas . . . . . . . . . . . . .

(GENERAL)

Output power . . . . .

Speaker . . . . . . . . . . . . . .

Terminal impedance . .

Power Source .........

Memory back-up (CD) ...

Dimensions ...........

Weight . . . . . . . . . . . . . .

FILE NO.

M~~-900F (AU)

PRODUCT CODE No.

142 963 02

FM:88-108 MHZ

AM :525-1,710 kHz

Built-in ferrite bar and

telescopic rod antennas

4.0 Wx2(DC max.)

12 cm x2, 4ohms

PIEZO X2

PHONES :32 ohms

MIC :200-600 ohms/mV

AC :230-240 V, 50 tiz

DC: 12V

(8 x“D “size batteries)

DC :6V

(4 x“AA HP7/R6° size batteries))

460 (W) x220 (H) x245 (D) Imm

Approx. 4.8 kg without batteries

REFERENCE No. SM580346

CONTENTS —

LASER BEAM SAFETY PRECAUTIONS . . . . . . . . 1

OPERATING THE RESET SWITCH . . . . . . . . . . . 1

REMOVAL AND INSTALLATION ............. 2

TUNER ADJUSTMENTS ..................-6

TAPE DECK ADJUSTMENTS ...............7

CD PLAYER ADJUSTMENTS ...............8

SERVICE MODE .........................11

CD CHANGER MECHANISM OPERATION

DESCRIPTION .........................-14

LASER BEAM SAFETY PRECAUTIONS—

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

CAUTION :

USE OF CONTROLS OR ADJUSTMENTS

OR PERFORMANCE OF PROCEDURES

OTHER THAN THOSE SPECIFIED

HEREIN MAY RESULT IN HAZARDOUS

RADIATION EXPOSURE

LASER OUTPUT ........0.6mW Max. (CW)

WAVELENGTH ........... KIO nm

REPLACING THE PRINCIPAL PARTS &

OF THE CD CHANGER MECHANISM .........17

EXPLODED VIEW ........................25

PARTS LIST ...........................27

IC BLOCK DIAGRAM &DESCRIPTION ........38

SCHEMATIC DIAGRAM ....................40

WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . ...41

CD CHANGER BLOCK

SYSTEM CONTROL TERMINAL LEVELS .......63

CD CHANGER BLOCK FLOWCHART .........65

CLASS 1LASER PROOU

LUOKAN 1LASERLAIT

KLASS 1LASERAPPAR

CAUTION–INVISIBLE LASER RAOIATION

WHEN OPEN AND INTERLOCKS OEFEATEO.

AvOIOEXPOSURE TO BEAM.

,AOVARSEL-USYNLIG LAiEtiTRALING VEO A8NING.

NAR SIKKERHEOSAF8RYDERE ER UOE AF FUNKTION,

UNOGk UDS /ZTTELSE FOR STR~LING.

VARNING–0SYNLN3 LASER STR~LNIN.G NAR

OENNA DEL AR OPPNAO OCH SPARR AR URKOPPLAO.

STRALEN AR FARLIG.

VORSICHT-UNSICHTBARE LASERSTRAHLUNG TRITT AUS.

‘WENN OECKEL GEOFFNET UNO WENN SICHERHEITSVERRIEGELUNG

uBERBRUCKT [ST. NICHT, OEM STRAHL AUSSET2EN. A

VARO! .Avawssa fa suoialuk!lus. ohilellaes~a Olel allliina

nakyma!lomalle Iasemileilylle. Ali kalso saleeseen. II

OPERATING THE RESET SWITCH

WHAT TO DO IF ...

If the operation of the unit or display is n

normal, disconnect the power cord from the P

outlet and remove the batteries (if applicabl[

then press the RESET bulton (back of the un

for at least 20 seconds.

-1-

REMOVAL AND INSTALLATION *,.

●

This CD-radio-cassette player employs achanger mechanism as its CD block.

Care should be exercised when removing and reinstalling it.

All wiring should be returned to the original position after work is complete= 4

First have ready many the new FIXERS (614246 5271) for replacement. %

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

Remove any discs that are loaded in the CD changer. ...

Before disassembling the unit, set the POWER switch to the “OFF” positio~”

and wait 10 seconds while the CD changer mechanism enters standby stat&..

Then unplug the unit and begin the disassembly procedure. -2

CABINET

(1) Remove the battery lid.

(2) Remove the 8rear cabinet mounting screws.

4. --

c. CD CHANGER MECHANISM

BLOCK &P. C. BOARDS

—/’-’--k

b. TAPE MECHANISM

s---

.\. y

–2-

REMOVAL AND INSTALLATION

(j. SYSTEM CONTROL P. C. BOARD SAMF. CD P. C. BOARD

●Pull connectors straight out so that the pins do not bend. J

AMPICD

e. MOUNTING, POINTER f. “0” POINT ADJUSTMENT

MC-grease

EM-50L

... -3- -*..,

... ,.

REMOVAL AND INSTALLATION

g. WIRING LAYOUT

‘a)ANTENNk (b) TAPE MECHANISM #

(’/

— 5-5 TuRN

(d) CD CHANGER MECHANISM

7“7

‘“p’~””’p+g-m

~+ PRINT SIDE

●The CD changer mechanism and CD mechanism move

forward and back, and to the left and right.

Arranq& the lead wires as shown in the diagram.

VIEW -A

FIXER

IMOTOR

1f?C.B

FIXER

lr-r--=-

.Positiom the flexible P.C. board connected to the CEI

changer connector P.C. board so that it is not loose.

-4-

REMOVAL AND INSTALLATION

h. CD CHANGER MECHANISM

(a) TO OPEN THE DISC TRAY d

(1) Turn the cam gear counterclockwise. (~)

(2) The CD mechanism move

the down position. (~)

(3) Pull out the disc tray. (@))

(b) REMOVING THE DISC CASE

‘romtheuppo;n

CAM GEAR CD MECHANISM

1+ \,&

.pk

--, .,.,

—

T‘p‘UUWN

.Follow steps @through ~, in that order, to remove

the disc case. (c} PULLING OUT THE DfSC TRAY

(1) Move the CD mechanism to the down position. (~,@)

(2) Rllove the loading plate forward. (~)

(3) Pull out the disc tray. (@)

IMGEAR CD MECHANISM

TUP—DOWN

-5–

TUNER ADJUSTMENTS

.Use aplastic screw driver for adjustments.

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

Supply voltage

Phones impedance :

Standard output

Function switch

PARTS LOCATION

a. AM ADJUST

Adjusting

Step Circuit

1IIF

2Tuning

3coverage

4Tracking

DC 12.0 V

32 oh!m

&5 mW (126 mV)

RADIO f

IENT BAND SELECT SWITCH :

Connections

Input output

Closed the output Connect sweep

terminal by sweep generator to

generator, it place C2106 (H) &

to L2103. TP202 (G)

Connect AM SG Connect VTVM to

to Test Loop speaker terminals

Connect AM SG Connect VTVM to

to Test Loop speaker terminals

6lRepeat adjustments

455 kHz ILow IXF213

517k Hz Low end L2104

1750 kHz High end VCT -4

600 kHz 600 kHz L2103

1400 kHz 1400 kHz VCT -3

VTVM

Oscilloscope

-4-

Max.

b. FM ADJUSTMENT BAND SELECT SWITCH :FM FM Dummy antenna :75 ohm unbalance

Adjusting Connections

Step Circuit SG Frequency Position of tuning dial Adjustment

Input output

Connect sweep Connect sweep

1IF generator to generator to

IC201 @(H) C2106 (H) 10.7 MHz Low ..-

&TP202 (G) &TP202 (G)

2Connect FM SG

Tuning Connect VTVM to 87.0 ~~Z Low end L2102

to TP201 (H) &

3coverage TP202 (G) speaker terminals 109.0 MHz High end VCT-2

Connect FM SG Connect VTVM to

4Tracking to TP201 (H) &speaker terminals 98.0 MHz 98.0 MHz VCT- 1

TP202 (G)

5lReDeat adjustments

VTVM

Oscilloscope

Max

Max.

-6–

iii

. .

TAPE DECK ADJUSTMENTS

(a)

●

(b)

(1)

(2)

(3)

(4)

(5)

(a)

(b)

HEAD REPLACEMENT AND HEAD AZIMUTH ADJUSTMENT

HEAD REPLACEMENT 4

After replacement, demagnetize the heads by using adegausser.

Be sure to clean the heads before attempting to make any adjustments. 21P HEAD

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

HEAD AZIMUTH ADJUSTMENT

Load the test tape (VIT-703, etc., 10 kHz )for azimuth

adjustment.

Press the PLAY button.

Use across-tip screwdriver to turn the screw for azimuth

adjustment so that the left and right output are maximized.

Press the the STOP button.

After completion of the adjustment, use thread lock (TB-1401 B)

to secure the azimuth-adjustment screw.

MOTOR REPLACEMENT AND SPEED ADJUSTMENT

MOTOR REPLACEMENT

MOTOR SPEED ADJUSTMENT

(1) Insert the test tape (MTT-lllN, etc., 3000 Hz).

(2) Press the PLAY button.

(3) Use aflat-tip screwdriver to turn the SVR (located inside the rear

of the motor) to adjust SVR so that the frequency counter

becomes 3,000 Hz.

c. CHECKING THE MECHANISM TORQUES AND TENSION

WHiTE

HEAD AZIMUTH ADJ.

MOTOR SPEED

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

Measurement Take-up torque Back tension Tape tension

Cassette for PLAY:TW-211 1A Orive-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 60 gr or more

F.FWD 55-120 gr.cm

REW 55-120 gr.cm —

-7–

CD PLAYER ADJUSTMENTS

a. REPLACEMENT AND LUBRICATION OF THE PICK-UP

(1)

(2)

(3)

(4)

(5)

(6)

(7)

Remove the pick-up advance gear (2).

Remove the brackets (6) securing [he pick-up rail in place.

Pull out the pick-up rail (5).

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

the rails clean and also apply acoating of FLOIL (G-425A)

to their entire circumference and entire length.

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 “’Open” after the pick-up has been

replaced.

SHORT ~OPEN

NOTE ;

●In order to prevent damage by static electricity

during shipment. the indicated patterns on the

pick-up P.C.Board are short-circuited by solder.

●After the pick-up replacement, remove the

solder that is short-circuiting the patterns.

●

REPLACEMENT OF THE SLED MOTOR

Check the position of the red mark on the bottom of the

motor, as shown in the diagram.

c. LUBRICATION OF THE CD MECHANISM

●Be sure, at this time, not to touch MY other part.

●NOTE :FLOIL (G-425A)

(

fa d

.4f$iij)

%’2:“-

‘FLOIL(G-425A)

-6

(G-:>

(G-425A) I I I

[f I

-8-

iii

CD PLAYER ADJUSTMENTS

d. PREPARATIONS

(a) Measuring instruments, tools and fiiterr

(1)

(2)

(3)

(4)

(5)

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

Oscilloscope :SS5711 (10 MHz or dual-phenomenon)

or Memory scope :DSS6521 (Storagescope)

Screwdrivers (non-metallic) for adjustments

Low Pass Filter (L.P.F.)

Resistor, Carbon 2.2 Kohm, l/4W

e. PARTS LOCATION

S1606g

OPEN ICLOSE

In ❑I

.#f

Adjustment Measuring Service Input output Adjustment

Item instrument Mode connection connection location Adjustment value

(a) Tracking Oscilloscope YES TP 131 :TE

—SVR12 Waveform symmetry

balance L.P.F. TP132:VC A=B 1.5 Vp-p

(b) Checking Check be sure that the “eye”

J1479 :RF _

the “eye” Oscilloscope –—pattern is at the center of the

TP 132:VC

pattern waveform and that the dia-

mond shape is clearly defined

-9-

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