ZS-2000 - Sony Audio Service Manual (repair manual)

– 1 –

AEP Model

Model Name Using Similar Mechanism

ZS-D50

   CD

CD Loading Mechanism Type

VLM-ZS2000

Section

CD Mechanism Type

CDM-2411AAA

Optical Pick-up Name

DAX-01A2

System

Compact disc digital audio system

Laser diode properties

Material: GaAlAs
Wave length: 780 nm
Emission duration: Continuous
Laser output: Less than 44.6 µW
(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/–0.7 dB

Wow and flutter

Below measurable limit

Frequency range

FM: 87.5 - 108 MHz
MW: 531 - 1,602 kHz
LW: 153 - 279 kHz

IF

FM: 10.7 MHz
MW/LW: 450 kHz

Aerials

FM: Telescopic aerial
MW/LW: Loop aerial
Radio-controlled clock: Ferrite-bar aerial

Speaker

Full range: 8 cm (3 

1

/

4

 in.) dia., 4 ohms, cone type x 2

Input

LINE IN jack (stereo minijack)
Minimum input level 250 mV

Outputs

Headphones jack (stereo minijack)
     For 16 - 68 ohms impedance headphones
OPTICAL DIGITAL OUT (CD) (optical output
connector)
     Wavelength: 630 - 690 nm

Maximum power output

7.5 W + 7.5 W

Power requirements

For personal audio system:
230 V AC, 50 Hz
For remote control:
3 V DC, 2 R6 (size AA) batteries

Power consumption

AC 28 W

Dimensions (incl. projecting parts)

approx. 470 

×

 206.5 

×

 145.5 mm (w/h/d)

(18 

5

/

8

 

×

 8 

1

/

4

 

×

 5 

3

/

4

 inches)

Mass

approx. 5 kg (11 lb.)

Supplied accessories

Remote control (1) (RMT-C200AD)
Aerial unit (1)
Speaker nets (2)

Design and specifications are subject to change without
notice.

– 2 –

1-1.   Notes on Handling the Optical Pick-up Block or Base Unit .. 3
1-2.   Notes on Laser Diode Emission Check ............................... 3
1-3.   Notes on Chip Component Replacement ............................ 3
1-4.   Flexible Circuit Board Repairing ........................................ 3
1-5.   Laser Diode and Focus Search Operation Check ................ 3
1-6.   Caution During when Mounting the Pulley for the

  Loading Motor .................................................................... 3

         Setting the Clock Automatically .......................................... 4
         Playing a CD ....................................................................... 4
         Listening to the Radio ......................................................... 5
         Setting the Time Signal ....................................................... 5
         Preparing the System ........................................................... 6
         Saving Power ....................................................................... 6

3-1.   “Net Sub Assy, Saran”, Speaker (Front) Sub Assy ............. 7
3-2.   Cabinet, Front ...................................................................... 8
3-3.   Top Cabinet Assy ................................................................ 9
3-4.   CD Block Assy .................................................................... 9
3-5.   Power Board, REG Board ................................................. 10
3-6.   TU Board, EXT ANT Board ............................................. 10
3-7.   “Cover, Heat Sink”, Line Board ........................................ 11
3-8.   Volume Board .................................................................... 11
3-9.   H/P Board, Switch (1) Board, Switch (2) Board ............... 12
3-10. FL Board, Lamp Board ..................................................... 12
3-11. Control Board .................................................................... 13
3-12. Main Board ....................................................................... 13
3-13. CD Board .......................................................................... 14
3-14. CD Block Section .............................................................. 14
3-15. Tray Assy, CD ................................................................... 15
3-16. Loading Board ................................................................... 15
3-17. Optical Pick-up, Pick-up Relay Board .............................. 16
3-18. CL/Receiver Board ............................................................ 16

4-1.   General Description .......................................................... 17
4-2.   Test Mode .......................................................................... 17

5-1.   Tuner Section .................................................................... 19
5-2.   Loop Antenna Section ....................................................... 21
5-2.   CD Section ........................................................................ 21

6-1.   IC Pin Description ............................................................. 22
6-2.   Circuit Boards Location .................................................... 24
6-3.   Block Diagram –Tuner Section– ....................................... 25
6-4.   Block Diagram –CD Section– ........................................... 27
6-5.   Block Diagram –Audio Section– ...................................... 29
6-6.   Printed Wiring Boards –Tuner Section– ........................... 31
6-7.   Schematic Diagrams –Tuner Section– .............................. 33
6-8.   Printed Wiring Boards –CD Section– ............................... 35
6-9.   Schematic Diagrams –CD Section– .................................. 37
6-10. Printed Wiring Boards –Pick-up Section– ........................ 39
6-11. Schematic Diagrams –Pick-up Section– ........................... 41
6-12. Printed Wiring Boards –Main Section– ............................ 43
6-13. Schematic Diagrams –Main Section– ............................... 45
6-14. Printed Wiring Boards –Control Section– ......................... 47
6-15. Schematic Diagrams –Control Section– ........................... 49
6-16. Printed Wiring Boards –Display Section– ........................ 51
6-17. Schematic Diagrams –Display Section– ........................... 53
6-18. Printed Wiring Boards –Power Supply Section– .............. 55
6-19. Schematic Diagrams –Power Supply Section– ................. 57
6-20. Printed Wiring Board –Loop Antenna Section– ................ 58
6-21. Schematic Diagram –Loop Antenna Section– .................. 59

7-1.   Front Cabinet Section ........................................................ 65
7-2.   Rear Cabinet Section ......................................................... 66
7-3.   CD Block Section .............................................................. 67
7-4.   CD Loading Section (VLM-ZS2000) ............................... 68
7-5.   Optical Pick-up Section (CDM-2411AA) ......................... 69
7-6.   Loop Antenna Section ....................................................... 70

...................................... 71

– 3 –

This Compact Disc player
is classified as a CLASS 1
LASER product.
The CLASS 1 LASER
PRODUCT label is located
on the bottom exterior.

0

0

The laser diode in the optical pick-up block may suffer electro-
static 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 emis-
sion, observe from more than 30 cm away from the objective lens.

• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

• Keep the temperature of the soldering iron around 270 ˚C dur-

ing repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering

or unsoldering.

1. Close the lid for CD.
2. Press CD u button.
3. Confirm the laser diode emission while observing the objecting

lens.  When there is no emission, Auto Power Control circuit or
Optical Pick-up is broken.
Objective lens moves up and down once for the focus search.

Make the following adjustment when mounting the loading motor
(part number: 1-698-999-11) and motor pulley (part number: 2-
627-174-01) of the CD section.

Use of controls or adjustments or performance of proce-
dures other than those specified herein may result in haz-
ardous radiation exposure.

– 4 –

This section is extracted
from instruction manual.

Basic Operations

4

GB

This player  is equipped  with the Radio-Controlled  Clock Auto Adjust System.  The
system receives clock data (hour, minute, second, and adjustment to/from daylight
saving time) on a certain radio wave, and automatically  adjusts  the clock accordingly.

Connect the mains lead to the mains (see page 35).

Connect the aerial unit (see page
34).

When the power is off, press
CLOCK AUTO ADJUST.
Check that   flashes  in the
display. If   does  not  flash,  press
CLOCK AUTO ADJUST  again.

When the Auto Adjust process
has been completed,     will stop
flashing and remain lit in the
display.

If “

” does  not  flash  and 

flashes  in the display, the player
is not  receiving  the  clock data
signal correctly. Reorient  the
aerial unit.

m

Basic Operations

5

GB

• If you  turn  on  the

player, the Clock Auto
Adjust System  stops
operation.

• Do not place  the  aerial

unit where  reception  is
weak, such as:
– near  a TV, refrigerator,

computer, etc.

– on a steel  table,  steel

shelf, or other steel
objects.

• The actual  adjustment  to

or from daylight  saving
time under  the Clock
Auto Adjust System
may be done  up to 12
hours later than the
exact moment of
transition in the year.

 will remain  lit in the  display.  The  player  tries  to

receive the clock data signal every hour. If the player
fails to receive  the  clock data  signal  for 12 hours, 
will disappear  from  the  display.  In  this  case,  set  the
clock manually  (see  page  26).

Press CLOCK AUTO ADJUST to make   disappear
from the  display.

The Clock Auto Adjust System will automatically
receive the clock data every hour without any manual
operation and corrects the clock accordingly, if
needed. 

 will not flash but remain  lit during such

automatic operation.

When reception  is poor, place the aerial unit near the
window.

The Clock Auto Adjust System  automatically
switches  the clock indication to the daylight saving
time (summer  time), and  back,  at the necessary  time
of the  year.

To check  if the  player’s clock is on the daylight saving
time or not, press  SUMMER TIME. “Summer On” or
“Summer Off” will be  displayed.

To set the daylight saving  time manually,  see  page  27.

• You can  use  this player

before you set the clock.

• The Clock Auto Adjust

clock data  signal  is
transmitted from the
following locations:
– Teddington,

Middlesex, England
52

°

 22’ N, 01

°

 11’ W

– Mainglingen,

Germany
50

°

 0.1’ N, 09

°

 00’ E

Basic Operations

6

GB

Connect  the mains lead to the mains (see page 35).

Press  Z CD OPEN/CLOSE
(direct power-on)  and place  the
CD on the  CD  tray until it clicks
into place.

Press  u (N on the remote).

The CD tray closes  and the player
plays all the tracks once.

Basic Operations

7

GB

Next time you want to
listen to a CD, just press
u. The  player  turns  on
automatically and starts
playing the CD.

adjust the volume

Turn VOLUME toward +

or  – (press  VOL +, – on
the remote).

stop playback

P re s s x .

pause playback

Press  u  ( X

 on 

the

remote).
Press again to resume play
after pause.

go to the next track

P re s s   >

.

go back  to the previous  track

P re s s .

.

remove the CD

Press  Z CD OPEN/
CLOSE.

turn on/off the player

Press OPERATE.

u

.

>

Z

x