Sony ZS-2000 (serv.man2) Service Manual ▷ View online
– 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.
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
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.
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)
(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
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
BAND button: AM
75 kHz frequency
deviation by 1 kHz signal
output level : as low as possible
deviation by 1 kHz signal
output level : as low as possible
• FM Section
Setting:
BAND button: FM
BAND button: FM
30% amplitude
modulation by 400 Hz signal
output level : as low as possible
modulation by 400 Hz signal
output level : as low as possible
• Connecting Level Meter (FM and AM)
FM ANTENNA
terminal
(TM1( 75
terminal
(TM1( 75
Ω
))
FM RF signal
generator
generator
0.01
µ
F
set
Put the lead-wire
antenna close to
the supplied
AM loop antenna.
antenna close to
the supplied
AM loop antenna.
AM RF signal
generator
generator
i
jack (J401)
set
32
Ω
level meter
(range: 0.5-5 V ac)
(range: 0.5-5 V ac)
digital
voltmeter
voltmeter
TU board
TP (VT)
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.
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>
AM TRACKING 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>
FM TRACKING 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.
In case of operation check, confirm that focus bias.
FOCUS BIAS CHECK
Procedure:
1. Connect the oscilloscope between IC701 pin ed (or TP (RF))
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 N X button.
4. Confirm that the oscilloscope waveform is as shown in the
3. Press the CD N X button.
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.
A good eye pattern means that the diamond shape ( ) in the
center of the waveform can be clearly distinguished.
Test Point:
VOLT/DIV: 50 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
RF level:
0.95 - 1.35 Vp-p
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.
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 (for A/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
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