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US Model

Canadian Model

AEP Model

UK Model

MICROFILM

Model Name Using Similar Mechanism

NEW

Base Unit Type

VLM-ZSD7-142

Optical Pick-up Type

CDM-2411AAA

Model Name Using Similar Mechanism

PMC-D305/D305L

Tape Transport Mechanism Type

MF-D7-145

— Continued on next page —

Tape
Section

CD
Section

POWER OUTPUT AND TOTAL
HARMONIC DISTORTION

With 4 ohm loads, both channels driven fro100 - 10,000 Hz; rated 7W
per channel-minimum RMS power, with no more than 10 % total
harmonic distortion in AC operation.

CD player section

System

Compact disc digital audio system

Laser diode properties

Material:

GaAlAs

Wave lengh:

780nm

Emission duration:

Continuous

Laser output :

Less than 44.6

µ

W (This output is the

value measured at a distance of about 200 mm from the
objective lens surface on the optical pick-up block with 7
mm aperture.)

Spindle speed

200 r/min (rpm) to 500 r/min(rpm)(CLV)

Number of channels

2

Frequency response

20 – 20,000 Hz + 0.5/– 2 dB

Wow and flutter

Below measurable limit

Radio section

Frequency range

US, Canadian

FM: 87.6 - 108 Hz
AM: 530 - 1,710 kHz

AEP, UK

FM: 87.6 - 107 MHz
MW: 531 - 1,602 MHz
LW: 153 - 279 kHz

Aerials

FM: Telescopic aerial
AM: Built-inferrite bar aerial

Cassette-corder section

Recording system

: 4-track 2 channel stereo

Fast winding time

: Approx. 130s (sec.) with Sony casette C-60

Frequency response

: TYPE 1 (normal) : 100 - 10,000 Hz

General

Speaker

Full range: 5 cm (2 in.) dia, 8 

Ω

, cone type x 4

Control

MD CONTROL jack

Input

LINE IN jack (stereo minijack)

Minimum input level 250 mV

Outputs

Headphones jack (stereo minijack)

For 16 - 68 

Ω

 impedance headphones

DC OUT (6 V 800 mA MAX) jack
LINE OUT jack (stereo minijack)

Rated output level 250mV at load impedance 47 k

Ω

s

OPTICAL DIGITAL OUT (CD) jack (optical output connector)

Wavelength: 630 - 690 nm

Power output (excluding US model)

10 W + 10 W (at 4 

Ω

, 10 % harmonic destortion)

Power requirements

For personal audio system:

120 V AC, 60 Hz
12V DC, 8 size D (R 20) batteries

For memory back-up:

6 V DC , 4 size AA (R6) batteries

For remote commander:

3 V DC, 2 size AA (R6) batteries

Power consumption

AC 38 W

— 2 —

!

!

!

    After correcting the original service problem, perform the
following safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.

    The AC leakage from any exposed metal part to earth ground
and from all exposed metal parts to any exposed metal part having
a return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.

1.

A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.

2.

A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.

3.

Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples of
a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)

To Exposed Metal 

Parts on Set

0.15 

µ

F

1.5 k

Ω

AC
Voltmeter
(0.75 V)

Earth Ground

Fig. A.  Using an AC voltmeter to check AC leakage.

···························································· 3

·········································································· 4

3-1.

Cabinet (Rear) Assy ·························································· 12

3-2.

Main Board, Radio Board ················································ 13

3-3.

CD Tray Assy (VLM-ZSD7-142)····································· 14

3-4.

Mechanism Assy (FM=D7-145) ······································· 14

3-5.

Control Board, MD Regulator Board ······························· 15

3-6.

Jack Board, H/P Board, MD Jack Board,
DC Out Board ··································································· 15

3-7.

Diode Board, AC Inlet Board, EXT ANT Board,
Relay Board ······································································ 16

3-8.

Loading Board ·································································· 16

3-9.

Loading Chassis Assy, Drive Assy ··································· 17

3-10. CD Tray Assy, Relay Board ············································· 17

···································································· 18

································ 18

·································· 19

7-1.

Circuit Board Location ····················································· 22

7-2.

Block Diagram – Main Section – ····································· 23

7-3.

Block Diagram – Tuner/CD Section – ····························· 26

7-4.

Printed Wiring Board – Diode Section – ·························· 29

7-5.

Schematic Diagram – Diode Section – ····························· 32

7-6.

Printed Wiring Board – Main Section – ··························· 34

7-7.

Schematic Diagram – Main Section (1/4) – ····················· 39

7-8.

Schematic Diagram – Main Section (2/4) – ····················· 42

7-9.

Schematic Diagram – Main Section (3/4) – ····················· 45

7-10. Schematic Diagram – Main Section (4/4) – ····················· 48
7-11. Printed Wiring Board – Jack/DC Section – ······················ 51
7-12. Schematic Diagram – Jack/DC Section – ························· 54
7-13. Printed Wiring Board – Control Section – ······················· 55
7-14. Schematic Diagram – Control Section – ·························· 59
7-15. Printed Wiring Board – Tuner Section – ·························· 62
7-16. Schematic Diagram – Tuner Section (US/CND) – ··········· 65
7-17. Schematic Diagram – Tuner Section (AEP) – ·················· 68
7-18. IC Pin Function Description ············································· 71
7-19. IC Block Diagrams ··························································· 72

8-1.

Cabinet (Front) Section ···················································· 76

8-2.

Cabinet (Rear) Section 1 ·················································· 77

8-3.

Cabinet (Rear) Section 2 ·················································· 78

8-4.

CD Chassis Section 1 (VLM-ZSD7-142) ························ 79

8-5.

CD Chassis Section 2 (VLM-ZSD7-142) ························ 80

8-6.

Optical Pick-up Section (CDM-2411AAA) ····················· 81

8-7.

Mechanism Deck Setion 1 (MF-D7-145) ························· 82

8-8.

Mechanism Deck Setion 2 (MF-D7-145) ························· 83

······································· 84

Battery life

For personal audio system
FM recording
Sony R20P: approx. 3.5 h
Sony alkaline LR20: approx. 10h
Tape playback
Sony R20P: approx. 1h
Sony alkaline LR20: approx. 2.5h
CD playback
Sony R20P: approx. 1h
Sony alkaline LR20: approx. 2h

Dimensions (incl. projicting parts)

Approx. 482 x 238 x 125 mm (w/h/d)

(19 x 5 x 5 inches)

Mass (incl. batteries)

Approx. 5.2 kg (11 lb. 7 oz)

Supplied accessories

AC power cord (1)
MD connecting cord (1)
Remote commander (1)

Design and specifications are subject to change without notice.

Sony MDR headphone series

— 3 —

This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.

The following caution label is located inside the unit.

Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.

The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.

The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.

On repairing CD section, playing a disc without the CD lid, use
Check Plate Jig.
• Code number of Chuck Plate Jig : X-4918-225-1

— 4 —

This section is extracted
from instruction manual.

1 TAPE CONTROL button
2 DIR MODE button
3 COUNTER RESET button
4 RADIO/CD/MD CONTROL button
5 CD TRAY
6 MD (LINE) button
7 CONTROL MD m CD button
8 DUB START CD m MD button
9 CASSETTE LID
0 PUSH OPEN/CLOSE button

!¡ POWER button
!™ OPR/BATT lamp
!£ Remote Sensor
!¢ DISPLAY button
!∞ Display
!§ STANDBY button
!¶ CLOCK button
!• TIMER/SLEEP button
!ª MENU button

@º ENTER button
@¡ CANCEL button
@™ SOUND button
@£ MEGA BASS button
@¢ VOLUME button
@∞ JOG DIAL
@§ Speaker
@¶ INPUT/OUTPUT
@• PHONES JACK