Sony ZS-2000 Primary User manual

– 1 –
ZS-2000
SERVICE MANUAL
PERSONAL AUDIO SYSTEM
US 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
CD player section
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
Radio section
Frequency range
FM: 87.6 - 108 MHz
AM: 530 - 1,710 kHz
Antennas
FM: Telescopic antenna
AM: Loop antenna
SPECIFICATIONS
General
Speaker
Full range: 8 cm (3 1/4in.) dia., 4 ohms, cone type x 2
InputLINE 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
Power requirements
For personal audio system:
120 VAC, 60 Hz
For remote control:
3 V DC, 2 size AA (R6) batteries
Power consumption
AC 30 W
Dimensions (incl. projecting parts)
approx. 470 ×206.5 ×145.5 mm (w/h/d)
(18 5/8×8 1/4×5 3/4inches)
Massapprox. 5 kg (11 lb.)
Supplied accessories
Remote control (RMT-C200A) (1)
AM loop antenna (1)
Speaker nets (2)
Design and specifications are subject to change without
notice.
Ver 1.0 2000. 07
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL
HARMONIC DISTORTION
With 4-ohm loads, both channels driven from
150 - 15,000 Hz; rated 6.5 W per channel-
minimum RMS power, with no more than 10%
total harmonic distortion in AC operation.

– 2 –
1. SERVICING NOTES
1-1. Laser Diode and Focus Search Operation Check................4
1-2. Caution During when Mounting the Pulley for the
Loading Motor ....................................................................4
2. GENERAL
Playing a CD ....................................................................... 5
Listening to the radio........................................................... 5
Setting the clock ..................................................................6
Setting the time signal ......................................................... 6
Saving Power ....................................................................... 6
3. DISASSEMBLY
3-1. “Net SubAssy, 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........................................................................... 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 ...........................................................................12
3-11. Control Board, Lamp 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 Block, Pick-up Relay Board ...................16
4. TEST MODE
4-1. General Description .......................................................... 17
4-2. Test Mode ..........................................................................17
TABLE OF CONTENTS
5. ELECTRICAL ADJUSTMENTS
5-1. Tuner Section .................................................................... 18
5-2. CD Section ........................................................................ 19
6. DIAGRAMS
6-1. IC Pin Description.............................................................20
6-2. Circuit Boards Location .................................................... 22
6-3. Block Diagram –Tuner Section– ....................................... 23
6-4. Block Diagram –CD Section–........................................... 25
6-5. Block Diagram –Audio Section– ...................................... 27
6-6. Printed Wiring Board –Tuner Section– ............................. 29
6-7. Schematic Diagram –Tuner Section–................................ 31
6-8. Printed Wiring Board –CD Section– ................................. 33
6-9. Schematic Diagrams –CD Section– .................................. 35
6-10. Printed Wiring Boards –Pick-up Section– ........................ 37
6-11. Schematic Diagrams –Pick-up Section– ........................... 39
6-12. Printed Wiring Boards –Main Section– ............................ 41
6-13. Schematic Diagrams –Main Section– ............................... 43
6-14. Printed Wiring Boards –Control Section–......................... 45
6-15. Schematic Diagrams –Control Section– ........................... 47
6-16. Printed Wiring Boards –Display Section– ........................ 49
6-17. Schematic Diagrams –Display Section– ........................... 51
6-18. Printed Wiring Boards –Power Supply Section– .............. 53
6-19. Schematic Diagrams –Power Supply Section– .................55
7. EXPLODED VIEWS
7-1. Front Cabinet Section........................................................ 60
7-2. Rear Cabinet Section.........................................................61
7-3. CD Block Section.............................................................. 62
7-4. CD Loading Section (VLM-ZS2000) ............................... 63
7-5. Optical Pick-up Section (CDM-2411AA) ......................... 64
8. ELECTRICAL PARTS LIST...................................... 65

– 3 –
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINE
WITH MARK 0ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL
OR IN SUPPLEMENTS PUBLISHED BY SONY.
NOTES ON HANDLINGTHE OPTICAL PICK-UP
BLOCK OR BASE UNIT
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.
NOTES ON LASER DIODE EMISSION CHECK
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.
NOTES ON CHIP COMPONENT REPLACEMENT
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
FLEXIBLE CIRCUIT BOARD REPAIRING
• 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.
CAUTION
Use of controls or adjustments or performance of proce-
dures other than those specified herein may result in haz-
ardous radiation exposure.
To Exposed Metal
Parts on Set
0.15µF 1.5k
Ω
AC
voltmeter
(0.75V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety check before releasing the set to the customer:
Checktheantenna terminals,metal trim, “metallized”knobs, screws,
and all other exposed metal parts forAC leakage. Check leakage as
described below.
LEAKAGETEST
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. Acommercial 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-operatedAC 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 2VAC range are suitable. (See Fig. A)

–4 –
1-1. LASER DIODE AND FOCUS SEARCH
OPERATION CHECK
1. Close the lid for CD.
2. Press CD ubutton.
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.
1-2. CAUTION DURINGWHEN MOUNTINGTHE
PULLEY FORTHE LOADING MOTOR
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.
pulley
M790
0.9 to 1.1 mm
Install the pulley to the motor.
SECTION 1
SERVICING NOTES

–5 –
SECTION 2
GENERAL This section is extracted
from instruction manual.
Playing a CD
Connect the AC power cord to the wall outlet (see page 26).
1Press ZCD OPEN/CLOSE
(direct power-on) and place the
CD on the CD tray until it clicks
into place.
2Press u(Non the remote).
The CD tray closes and the player
plays all the tracks once.
With the label sideup
Display
PlayingtimeTrack number
21
Basic Operations
Usethese buttons for additional operations
Tip
Next time you want to
listen to a CD, just press
u. The player turns on
automatically and starts
playing the CD.
To Do this
adjust the volume Turn VOLUME toward +
or –(press VOL +, –on
the remote).
stop playback Press x.
pause playback Press u (Xon the
remote).
Press again to resume play
after pause.
go to the next track Press >.
go back to the previous track Press ..
remove the CD Press ZCD OPEN/
CLOSE.
turn on/off the player Press POWER.
u
., >
Z
CD
OPEN/CLOSE
VOLUME
POWER
x
Listening to the radio
Connect the AC power cord to the wall outlet (see page 26).
1Press RADIO BAND •AUTO
PRESET until the band you want
appears in the display (direct
power-on).
Each time you press the button,
the band changes as follows:
“FM1”t“FM2”t“AM”
2Hold down TUNE•TIME SET +
or –(TUNE + or –on the remote)
until the frequency digits begin to
change in the display.
The player automatically scans
the radio frequencies and stops
when it finds a clear station.
If you cannot tune in a station,
press the button repeatedly to
change the frequency step by
step.
Display
Indicates an FM
stereo broadcast.
12
To Do this
adjust the volume Turn VOLUME toward +
or –(press VOL +, –on
the remote).
turn on/off the radio Press POWER.
To improve broadcastreception
FM:
Reorient the antenna for FM.
AM:
Keep the AM loop antenna as far as possible from the
player and reorient it.
If the broadcast is still noisy, connect the external
antenna (page 27).
Usethese buttons for additional operations
Tips
•The “FM1”and “FM2”
bands have the same
functions. You can store
the stations you want
separately in “FM1”and
“FM2”(page 14).
•If the FM broadcast is
noisy, press PLAY
MODE•MONO/ST
(MODE on the remote)
until “Mono ”appears in
the display and the
radio will play in
monaural.
•Next time you want to
listen to the radio, just
press RADIO BAND •
AUTO PRESET. The
player turns on
automatically and starts
playing the previous
station.
PLAY MODE
MONO/ST
POWER VOLUME

–6 –
Setting the clock
“– –:––” indication appears in the
display until you set the clock.
The Timer
Tip
The time display
system of this player is
the 12-hour system.
1 Press and hold CLOCK until the hour digits flash.
2
Set the time.
1Press TUNE•TIME
SET + or –to set the
hour and press
DISPLAY •ENTER
MEM.
2Press TUNE•TIME
SET + or –to set the
minutes.
3 Press DISPLAY •ENTER
MEM.
The clock starts from 00
seconds.
To change the display to the daylight saving time
(summertime) indication
Press and hold SUMMER TIME for 2 seconds.
“Summer On”appears in the display for a few
seconds.
To cancel the summer time indication
Press and hold SUMMER TIME again.
“Summer Off”appears in the display for a few
seconds.
TUNE
TIME SET–, +
DISPLAY
ENTER MEM
CLOCK
SUMMERTIME
m
1 When the power is off, press TIME SIGNAL to
display “TIME SIGNAL”indication.
Do the following operations by checking the
display.
2 Press TUNE•TIME SET + or –until the sound you
want appears in the display, and press DISPLAY •
ENTER MEM.
Display Intervals
Wall Clock Sounds on the hour the number of times
corresponding to the hour and again on the
half hour once (Example: Three times at
3:00 p.m. and again at 3:30 p.m. once).
Harp Sounds on the hour once
Music Box Sounds on the hour once
Chime Sounds on the hour once
Organ Sounds on the hour once
3 Press TUNE•TIME SET + or –to set the volume
you want, and press DISPLAY •ENTER MEM.
Setting the time
signal
When the power is off, you can hear the
time signal on this player. You can select
the sound for the time signal. Make sure
you have set the clock (see page 18).
TIME SIGNAL
Note
The time signal does
not sound when the
player is turned on.
TUNE
TIME SET–, +
DISPLAY
ENTER MEM
Display
continued
4Press TUNE•TIME SET + or –to select the time for
the time signal function to work, and then press
DISPLAY •ENTER MEM.
Display Time signalsounds
Off Not at all
Every Hour All day
Auto 7:00 a.m. - 10:00 p.m.
Once a Day* Once a day
* If you selected “Wall Clock ”in step 2, you cannot select
“Once a Day”
5If you selected “Once a Day ”in step 4, set the time
for the time signal to sound. (If you selected other
items in step 4, omit this step.)
1Press TUNE•TIME SET + or –to set the hour
and press DISPLAY•ENTER MEM.
2Press TUNE•TIME SET + or –to set the minutes
and press DISPLAY•ENTER MEM.
To checkthe sound types (demonstration mode)
Press and hold TIME SIGNAL for about 2 seconds.
You can hear the five types of sound once.
Setting the time signal (continued) Saving power
Even when power is turned off, this
player consumes about 5.6 W for time
indication, timer operation, remote
control reception. If you use the saving
power function, you can reduce power
consumption to less than 1 W.
DISPLAY
ENTERMEM
When the power is off, press and hold
DISPLAY •ENTER MEM for about 2 seconds.
The player enters the lower power consumption
standby mode.
To cancel the saving power
To make the time indication appear, press and hold
DISPLAY •ENTER MEM for about 2 seconds when the
power is off.

–7 –
SECTION 3
DISASSEMBLY
Note : This set can be disassemble according to the following sequence.
Note : Follow the disassembly procedure in the numerical order given.
3-1.“NET SUB ASSY,SARAN”, SPEAKER (FRONT) SUB ASSY
Set
“Net Sub Assy, Saran”, Speaker (Front) Sub Assy
Cabinet, Front
CD Block Assy
Top Cabinet Assy
Volume Board
H/P Board, Switch (1) Board,
Switch (2) Board
TU Board “Cover, Heat Sink”, Line Board
FL Board
Control Board, Lamp Board
Main Board CD Board CD Block Section
Tray Assy, CD
Loading Board
Optical Pick-up Block,
Pick-up Relay Board
Power Board,
REG Board
1net sub assy (L), saran
6speaker (front)
sub assy (L)
qd speaker (front) sub assy (R
)
7CN304
qf CN304
8net sub ass
y
(
R
)
, saran
2BVTP 3x55
3bush, net
qs bush, net
0bush, net
5bush, net
qa BVTP 3x55
9BVTP 3x55
4BVTP 3x55

–8 –
3-2. CABINET, FRONT
1BVTP 3x12
2BVTP 3x12
3BVTP 3x12
4cabinet, front
•Note for installation of the speaker (front) sub assy
AB
B
A B
BThere are two types of net “bush, net”:
Type A: 3-041-456-11 (with groove in the tube)
Type B: 3-041-456-01 (without groove in the tube)
The type A of “bush, net”should be installed at place Ain the left figure.
The t
y
pe B of “bush, net”should be installed at place B.

–9 –
3-4. CD BLOCK ASSY
8BVTP 3x10
9CD block assy
4BVTP 3x10
6BVTP 3x10
7BVTP 3x10
5RETAINER (2) board
1CN903
0CN402
qa CN403
qs CNP1
qd Connector
2CN902
3CN310
3-3.TOP CABINET ASSY
1CN904
2CN804
5BVTP 3x10
6BVTP 3x10
7top cabinet assy
3B 3x10
4antenna, telescopic

–10 –
3-6.TU BOARD
1BVTP 2.6x10
2BVTP 3x10
4B 3x6
5TU board
3bracket, tuner
3-5. POWER BOARD, REG BOARD
2BVTP 3x10
5BVTP 3x10
3BVTP 3x10
4POWER board
6REG board
1CN901

–11 –
3-8.VOLUME BOARD
3BVTP 3x10
4claws
5VOLUME boar
d
2CN806
1knob (VOL)
3-7.“COVER, HEAT SINK”, LINE BOARD
1BVTP 3x10
2BVTP 3x10
7BVTP 3x10
9BVTP 3x10
0LINE board
8holder, line
3claws
4claws
5claws
6cover, heat sin
k

–12 –
3-10. FL BOARD
3BVTP 3x8
4FL board
5CN503
1CN502
2CN501
3-9. H/P BOARD, SWITCH (1) BOARD, SWITCH (2) BOARD
1PWH 2x8 (DIA.6
)
2H/P board
4BVTP 3x8
6BVTP 3x8
7BVTP 3x8
5SWITCH (2) board
9SWITCH (1) board
8
3CN805

–13 –
3-12. MAIN BOARD
3BVTP 3x10
5MAIN board
4
2BVTP 3x10
1CN303
claws
3-11. CONTROL BOARD, LAMP BOARD
3BVTP 3x10
4CONTROL board
1CN802
2CN801
5LAMP board
claws

–14 –
3-14. CD BLOCK SECTION
1BVTP 3x10
3CD block section
chassis, C
D
2BVTP 3x10
3-13. CD BOARD
2BVTP 3x10
4CD boar
d
5CN713
3
1CN711

–15 –
3-16. LOADING BOARD
CD block section
2LOADING board 1BVTP 3x10
3Removal the solders.
3-15.TRAY ASSY, CD
6screws
(+BV 3x10)
1screws
(+BV 3x10)
qd
qs
9screws (+BV 3x10)
chassis, loading
0plate (L), side
4cover (L), side
2cover (R), side
7plate (R), side
5slider (R)
8slider (L)
qf tray assy, CD
3screws
(+BV 3x10)
qa CD lid assy

–16 –
3-17. OPTICAL PICK-UP BLOCK, PICK-UP RELAY BOARD
tray (bottom), CD
1BTP 2.6x8
3tray (top), CD
4claw
5claw 6PICK-UP RELAY boar
d
7CN707
8CN706
9CN702
0CN704
qa CN703
qs optical pick-up block
2BTP 2.6x8

–17 –
SLEEP
CLOCK TIMER
RADIO/BAND
AUTO PRESET
TEST-A
–SWITCH (1) BOARD –
SECTION 4
TEST MODE
4-1. GENERAL DESCRIPTION
This set has the TEST MODE that allows the CD unit to be
operational checked.
4-2.TEST MODE
4-2-1. Setting the test mode
1) Turn the power on.
2) Short the TEST-A land on the SWITCH(1) BOARD to open it
(or short between JW824 and JW825 to open the circuit).
4-2-2. Releasing the test mode
After the test mode is complete, turn the power off to release the
mode. Display
4-2-3.The contents of test mode
Mode name Description LCD display
STOP 1 The initial state and command are reset and the initial value is set.
After resetting, Stop 2 is switched to.
STOP 2 Stopped state.
FF/FR KEYis used to operate the SLED(PICK-UP).
The automatic adjustment value is held.
FOCUS FOCUS SERVO: ON. CLV-S TRACKING & SLED SERVO: OFF
If FOCUS SERVO does not turn on, for example, without disc,
FOUCS SEARCH is performed limitlessly.
When FOCUS SERVO is turned on, LPC is turned on and ‘PGM’is
displayed.
ALL SERVO All SERVOs are turned on. When LPC is turned on, ‘PGM’is displayed.
After automatic adjustment, ‘r = ’is displayed. If the automatic adjustment
value is manually changed, ‘SHUF’is displayed.
T.G UP With SERVO OFF, TRACKING in the GAIN UP state.
LPC is turned on.
SLED FWD With SERVO OFF, SLED (PICK-UP) is moved to the outer circumference.
SLED REV With SERVO OFF, SLED (PICK-UP) is moved to the inner circumference.
FOCUS FWD With FOCUS state, SLED(PICK-UP) is moved to the outer circumference.
FOCUS REV With FOCUS state, SLED (PICK-UP) is moved to the inner circumference.
LPC OFF When all SERVOs are on and LPC is off, ‘PGM’is turned off.
When LPC is on, PGM’is turned on.
88
88
v=
r=
r¢
u1
u2
v1
v2
-
88 x x xx
LCD display
(test item)
4-2-4. MODE transition table
STOP 1 STOP 1 FOCUS SLED RWD STOP 1 SLED FWD STOP 1
STOP 2 STOP 1 FOCUS SLED RWD STOP 2 SLED FWD STOP 2
FOCUS STOP 2 ALL SERVO FOCUS RWD FOCUS FOCUS FWD FOCUS
ALL SERVO STOP 2 LPC OFF FOCUS RWD FOCUS FOCUS FWD FOCUS
LPC OFF STOP 2 T.G UP FOCUS RWD FOCUS FOCUS FWD FOCUS
TG UP STOP 2 ALL SERVO FOCUS RWD FOCUS FOCUS FWD FOCUS
KEY operated
Current
TEST MODE STOP PLAY/PAUSE While held down When released While held down When released
TUNE
TIME SET –TUNE TIME SET +

–18 –
5-1.TUNER SECTION 0 dB = 1 µV
•AM Section
Setting:
BAND button: AM
75 kHz frequency
deviation by 1 kHz signal
output level :as low as possible
•FM Section
Setting:
BAND button: FM
30% amplitude
modulation by 400 Hz signal
output level :as low as possible
•Connecting Level Meter (FM and AM)
FM ANTENNA
terminal
(TM1( 75 Ω))
FM RF signal
generator
0.01 µF
set
Put the lead-wire
antenna close to
the supplied
AM loop antenna.
AM RF signal
generator
ijack (J401)
set
32 Ω
level meter
(range: 0.5-5 V ac
)
digital
voltmeter
TU board
TP (VT)
SECTION 5
ELECTRICAL ADJUSTMENTS
•Connecting Digital Voltmeter (FM and AM)
NOTE :1) Repeat the procedures in each adjustment several times,
and the tracking adjustments should be finally done
by the trimmer capacitors.
2) Remove FM antenna in FM adjustment.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
450 kHz (Display: 1,000 kHz)
AM FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display 530 kHz 1,710 kHz
Reading on Digital voltmeter 0.9 ± 0.1 V 4.7 ± 0.5 V
Adjustment Part T4 <confirmation>
AMTRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
T3 CT3
620 kHz 1,400 kHz
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2
10.7 MHz (Display: 98 MHz)
FM FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display 87.5 MHz 108 MHz
Reading on Digital voltmeter 1.5 ± 0.1 V 3.5 ± 0.4 V
Adjustment Part L2 <confirmation>
FMTRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1 CT1
87.5 MHz 108 MHz
Adjustment Location: TU board (See page 19.)

–19 –
Adjustment Location:
L2
FM
FREQUENCY
COVERAGE
ADJUSTMENT
T4
AM
FREQUENCY
COVERAGE
ADJUSTMENT
T1
AM IF
ADJUSTMENT
CT1 L1
FM TRACKING
ADJUSTMENT T3 CT3
AM TRACKING
ADJUSTMENT
TP(VT)
TM1
–TU BOARD (COMPONENT SIDE) –
T2
FM IF
ADJUSTMENT
(conductor side
)
VT(RF)
–CD board (conductor side) –
TP(RF)
5-2. CD SECTION
CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
FOCUS BIAS CHECK
Procedure:
1. Connect the oscilloscope between IC701 pin ed (or TP (RF))
and GND on CD board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the CD NXbutton.
4. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape ( ) in the
center of the waveform can be clearly distinguished.
Test Point:
VOLT/DIV: 50 m
V
TIME/DIV: 500 ns
RF level:
0.95 - 1.35 Vp-p
•RF signal reference waveform (eye pattern)
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.

–20 –
Pin No. Pin Name I/O Pin Description
1 R-COUNT I PLL IC count data output
2 R-CE O PLL IC chip enable output.
3 R-CLK O PLL IC clock output.
4 R-DATA O PLL IC data output.
5 R-MUTE O Tuner mute signal output.
6 RADIO O Radio block power supply control signal output L : Radio on
7 M-NAR I Melody IC NAR signal input
8 M-RST O Melody IC reset signal output
9 M-ST O Melody IC strobe signal output
10 M-I0 O Melody IC interface 0 data output
11 M-I1 O Melody IC interface 1 data output
12 M-I2 O Melody IC interface 2 data output
13 FL-RST O Reset signal output to the fluorescent indicator tube display drive IC (IC601)
14 CP O Clock pulse output to the fluorescent indicator tube display drive IC (IC601)
15 CD-LAMP O CD lamp (LAMP board) on/off signal output
16 DA O Serial data output to the fluorescent indicator tube display drive IC (IC601)
17 CS O Chip enable signal output to the fluorescent indicator tube display drive IC (IC601)
18,19 NC —Not used
20 FL-CON O FL 5V regulator control signal output
21 RY-CON O Relay (RY901 on POWER board) on/off control signal output
22 –27 NC —Not used
28 JOG-A I Rotary encoder (RV801) input terminal (A/D input)
29 JOB-B I Rotary encoder (RV801) input terminal (A/D input)
30 RST I System reset signal input from the reset signal generator (IC403) “L”: reset
31 EXTAL O Main system clock output terminal (8 MHz)
32 XTAL I Main system clock input terminal (8 MHz)
33 VSS —Ground terminal
34 TX I Sub system clock input terminal (32.768 kHz)
35 TEX O Sub system clock output terminal (32.768 kHz)
36 AVSS —Ground terminal (for A/D converter)
37 AVREF —Reference voltage (+3.3V) input terminal (forA/D converter)
38 R-SHIFT O System clock shift output.
39 INIT O Destination check output
40 SIMUKE I Destination setting terminal
41 –43 KEY1-KEY3 I Key input terminal (A/D input)
44 C-MUTE O Muting on/off control signal output for the CD playback signal “L”: muting on
45 OP/CL I CD tray open/close detect input.
46 INPUT1 O Loading motor control output.
47 INPUT2 O Loading motor control output.
48 RDS-CLK O RDS serial data transfer clock signal input from the RDS decoder (Not used)
49 RDS-DATA O RDS serial data input from the RDS decoder (Not used)
50 RDS-QUAL O RDS QUAL input from the RDS decoder (Not used)
51 C-SQCK O Sub-code Q data reading clock signal output to the CD DSP IC (IC702)
52 C-SQSO O Sub-code Q data input from the CD DSP IC (IC702)
53 NC —Not used
54 SENSE2 I Internal status (SENSE) input from the CD DSP IC (IC702)
55 SENSE1 I Internal status (SENSE) input from the CD DSP IC (IC702)
6-1. IC PIN DESCRIPTION
•IC801 CXP84332-229Q (SYSTEM CONTROL)
SECTION 6
DIAGRAMS