Sanyo MCDZX-700-F Service manual

FILE NO.

Service Manual

CONTENTS

CD Portable Radio
Cassette Recorder

MCD-ZX700F

PRODUCT CODE No.
164 081 00

(XE)

Specification ..................................................................... 1

Laser beam safety precaution .......................................... 1

Tuner Adjustment ............................................................. 2

Tape Deck Adjustment ..................................................... 3

IC Block Diagram & Description ....................................... 3,7

Exploded View (Cabinet & Chassis) ................................ 4

Parts List .......................................................................... 5

Exploded View & Parts List(Tape Deck) ......................... 7

Wiring Connection ............................................................ 11

Schematic Diagram (Micom) ............................................ 12

Schematic Diagram (CD) ................................................. 14

Schematic Diagram (Radio) .............................................16

Schematic Diagram (Audio) ............................................. 18

Wiring Diagram (CD Main/Amp/Tu) ............................... 20

Wiring Diagram (Rectifier, Display, Power) .................... 21

REFERENCE No. SM5810290

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SPECIFICATIONS

CD CHANGER SECTION

Channels .....................................2-channel stereo

Sampling frequency .................... 44.1 kHz

Pick-up ........................................ semiconductor laser

Laser output ................................ 0.6 mW (Continuous wave max.)

Wave length ................................ 790 nm

Wow and Flutter ..........................Below measurable limits

Radio

Reception frequency

FM ...........................................87.5 - 108 MHz (500 kHz step)

AM ........................................... 522 - 1,710 kHz (9 kHz step)

CASSETTE DECK

Track system ............................... 4 - track, 2 - channel stereo

Erasing system ........................... Magnet erase

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

Frequency response ................... 80 - 12,000 Hz

Fast forward and Rewind time .... Approx. 110 sec. (C - 60)

LASER BEAM SAFETY PRECAUTION

• Pickup that emits a laser beam is used on this CD section.

GENERAL SECTION

Output power ..............................3 W/ch (DC max.)

Speaker ....................................... 10 cm X 2

Terminal ...................................... PHONE : 32

Power source .............................. AC : 110 - 120/220 - 240 V , 50/60 Hz

.................................................... DC : 12V, 8 "R20/D" batteries

Dimensions ................................. Approx. 480(W) x 167(H) x 258(D)

mm

Weight (approx.) .........................3.0 kg (without batteries)

Specifications subject to change without notice.

CAUTION :
USE OF CONTROLS OR ADJUSTMENTS OR
PERFORMANCE OF PROCEDURES OTHER
THAN THOSE SPECIFIED HEREIN MAY RESULT
IN HAZARDOUS RADIATION EXPOSURE.

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

WAVE LENGTH ................. 790 nm

CAUTION – INVISIBLE LASER RADIATION WHEN OPEN AND
INTERLOCKS DEFEATED. AVOID EXPOSURE TO BEAM.

ADVARSEL – USYNLIG LASER STRÅLING VED ÅBNING, NÅR
SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION, UNDGÅ UDS ÆTTELSE
FOR STRÅLING.

VARNING – OSYNLIG LASER STRÅLNING NÄR DENNA DEL ÄR ÖPPNAD
OCH SPÄRR ÄR URKOPPLAD. STRÅLEN ÄR FARLIG.

VORSICHT – UNSICHTBARE LASERSTRAHLUNG TRITT AUS, WENN
DECKEL GEÖFFNET UND WENN SICHERHEITSVERRIEGELUNG
ÜBERBRÜCKT IST. NICHT, DEM STRAHL AUSSETZEN.

VARO – AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALTTIINA
NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE. ÄLÄ KATSO SÄTEESEEN.

- 1 -

TP4

TP3

TP7

CT102

T101

L102

TP1

L101

TP2

TP6 CT101

TP5

TP8

TP9

TUNER ADJUSTMENTS

t

• Use a plastic screw driver for adjustments.

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

• Set of unit
Supply voltage : DC 12V
Speaker : 32
Function switch : RADIO

PARTS LOCATION

1. AM ADJUSTMENT

Step Adjusting Tuning Adjust- VTVM

Input Connection Output Connection

Circuit Frequency Instrument Input Instrument Output ment Oscilloscope

1IF 999 KHz AM sweep Loop ANT. VTVM Speaker T103 Max.

(450 KHz) generator oscilloscope
2 Tuning 522 KHz --- --- Digital TP7(H) T101 1.5V±0.05V
3 coverage 1611 KHz --- --- voltmeter TP2(E) --- 7.4V±0.1V
4 Tracking 603 KHz AM signal Loop ANT. VTVM Speaker AM COIL Max.
5 1404 KHz generator oscilloscope CT102

1. FM ADJUSTMENT BAND SELECT SWITCH : FM FM Dummy Antenna:75Ω unbalance

Step Adjusting Tuning Adjust- VTVM

Input Connection Output Connection

Circuit Frequency Instrument Input Instrument Output ment Oscilloscope

1IF98.0MHz FM sweep TP3(H) VTVM TP5(H) --- Non Adjustmen

10.7NHz generator TP4(E) oscilloscope TP4(E)
2 Tuning 87.5Hz --- --- Digital TP6(H) L102 2.0V±0.1V
3 coverage 108.0MHz --- --- voltmeter TP2(E) --- 7.2V±0.1V
4 Tracking 90.0.MHz FM signal TP1(H) VTVM TP8(H) L101 Max.
5 106.0MHz generator TP2(E) oscilloscope TP9(E) CT103

This is a basic adjustment.

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TAPE DECK ADJUSTMENTS

1. HEAD REPLACEMENT

• After replacement, demagnetize the heads by using a degausser.

• Be sure to clean the heads before attempting to make any adjustments.

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

2. HEAD AZIMUTH ADJUSTMENT

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

adjustment.
(2) Press the PLAY button.
(3) Use a cross-tip screwdriver to turn the screw for azimuth

adjustment so that the left and right output are maximized.
(4) Press the STOP button.
(5) After completion of the adjustment, use thread lock(TB-1401B)

to secure the azimuth-adjustment screw.

3. AC BIAS FREQUENCY ADJUSTMENT

(1) Connect counter to T201(BS).
(2) R/P switch in recording state.
(3) Adjustment T801 a plastic screw , AC bias frequency : 80 kHz.

4. MOTOR SPEED ADJUSTMENT

(1) Insert the test tape(TCC-119, etc., 3,000 Hz).
(2) Press the PLAY button.
(3) Use a flat-tip screwdriver to turn the SVR(located inside the

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

become 3,000 Hz.

5. CHECKING THE MECHANISM TORQUES AND TENSION

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

Measurement Take-up torque Back tension Tape tension

Cassette for PLAY : TW-211A PLAY : TW-2111A Drive-power cassete

measurement F.FW/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. ----- -----

This is a basic adjustment.

IC BLOCK DIAGRAM & DESCRIPTION

IC903 LA6541D(CD Driver)

Vcc Vref VIN4 VG4 Vo8 Vo7 GND Vo6 Vo5 VG3 VIN3 CD RES

11k

Level

Sift

Level

Sift

BTL

Driver

BTL

Driver

Vcc

BTL

Driver

BTL

Driver

11k

Level

Sift

Level

Sift

131415161718192021222324

RESET

Regulator

11k11k

123456 789

Vcc Mute VIN1 VG1 Vo1 Vo2 GND Vo3 Vo4 VG2 VIN2 Reg OUT Reg IN

10 11 12

- 3 -

12

3

7

8

Y01

Y01

Y02

Y04

Y05

Y09

Y09

Y14

Y16

Y17

Y15

Y18

Y18

Y18

60

Y20

Y20

Y18

Y21

Y18

Y18

Y10

Y11

Y11

Y12

Y13

Y13

Y12

Y03

Y03

8

9

51

51

52

53

71

72

15

14

17

18

19

21

23

27

28

29

31

74

56

73

32

33

58

59

57

34

38

32

30

54

55

26

16

11

4

39

40

Y06

EXPLODED VIEW(CABINET & CHASSIS)

- 4 -