Sony CDX-4180 Service Manual ▷ View online
– 17 –
Carrier frequency: 1000 kHz
30% amplitude
modulation by
1 kHz signal
output level
30% amplitude
modulation by
1 kHz signal
output level
: 33 dB (44.7
µ
V)
Procedure:
1. Adjust IFT3 on TU01 so that the reading on the digital
1. Adjust IFT3 on TU01 so that the reading on the digital
voltmeter is 1.5
±
0.2 V.
Adjustment Location: tuner unit (TU01)
AM Auto Scan/Stop Level Adjustment
Setting:
SOURCE
n MODE button
: AM
D-BASS switch
: OFF
Frequency Select switch (E model) : AM 10K
AM RF signal
generator
dummy
antenna
antenna
terminal
terminal
set
SPEAKER OUT
level
meter
meter
+
–
30
Ω
4
Ω
15 pF
30 pF
+
–
digital
voltmeter
voltmeter
S-METER OUT
Adjustment Location: tuner unit (TU01)
– tuner unit (TU01) (component side) –
AM AUTO
SCAN/STOP
LEVEL ADJ
IFT3
AM SENS
ADJ
IFT3 IFT1
FEB1
FM SENS/IF
ADJ
IFT4
FM CENTER
ADJ
– tuner unit (TU01) (conductor side) –
IC1
R24
S-METER
OUT
FM CENTER
OUT
OUT
‘
’
– 18 –
CD SECTION
Note:
1. CD Block basically constructed to operate without adjustment.
1. CD Block basically constructed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use the oscilloscope with more than 10 M
3. Use the oscilloscope with more than 10 M
Ω
impedance.
4. Clean an objective lens by an applicator with neutral detergent
when the signal level is low than specified value with the following
checks.
checks.
Focus Bias Adjustment
Setting: This adjustment is performed with the set placed
horizontally.
Focus Gain Adjustment (Coarse adjustment)
This adjustment is not required unless the following parts are replaced:
•
•
Optical pick-up
•
RV4
Procedure:
1. Set RV4 to the standard position. (mechanical center)
2. Check whether operation noise (while noise type) caused by
1. Set RV4 to the standard position. (mechanical center)
2. Check whether operation noise (while noise type) caused by
the 2-axis device (lens section of the optical pick-up) is
abnormally loud.
If the operation noise is too loud, turn RV4 slightly counter-
clockwise.
abnormally loud.
If the operation noise is too loud, turn RV4 slightly counter-
clockwise.
•
If the gain is too low:
Focus does not function and no music is selected.
Focus does not function and no music is selected.
•
If the gain is too high:
Noise caused by scratches and dust is heard and the operation
becomes unstable.
Noise caused by scratches and dust is heard and the operation
becomes unstable.
Adjustment Location: servo board
Adjustment Location: servo board (component side)
Procedure:
1. Connect an oscilloscope between TP (RF) and TP (RF. GND)
1. Connect an oscilloscope between TP (RF) and TP (RF. GND)
on the SERVO board.
2. Connect the power supply.
3. Push the RESET button (S801) on the MAIN board.
4. Insert the disc (YEDS-18) and playback.
5. Adjust RV1 so that the oscilloscope waveform is clear and check
3. Push the RESET button (S801) on the MAIN board.
4. Insert the disc (YEDS-18) and playback.
5. Adjust RV1 so that the oscilloscope waveform is clear and check
RF signal level is correct or not.
Note: Clear RF signal waveform means that the sharp “
≈
” can be
clearly distinguished at the center of the waveform.
• When observing the eye pattern, set the oscilloscope to AC range
and raise the vertical sensitivity so that it may be easily seen.
Adjustment Location: servo board
RF signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
TIME/DIV: 500 nS
level: 1.0 – 1.5 Vp-p
IC3
CN1
IC1
CN2
FOCUS GAIN ADJ
RV4
TP
(RF. GND)
IC2
TP
(RF)
CN3
RV1
FOCUS BIAS ADJ
SERVO board
TP (RF)
TP (RF. GND)
oscilloscope
+
–
–
– 19 –
4-1. IC PIN DESCRIPTION
• IC801
µ
PD17705GC-526-3B9 (SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Pin Description
1
SIRCS
I
SIRCS input (A/D)
2
IN-SW
I
CD mechanism position detection
3
D-SW
I
CD mechanism position detection
4
SELF-SW
I
CD mechanism position detection
5
L-SW
I
LIMIT switch
6
LM-EJ
O
Loading motor control (Eject direction)
7
LM-LOD
O
Loading motor control (Loading direction)
8
ANT-ON
O
Power control for amplifier.
9
MONO
O
Force MONO output
10
SD
I
SD signal input
11
BAND-SW
I
Band plan setting of general area.
12
AREA1-SW
I
Destination select 1
13
AREA2-SW
I
Destination select 2
14, 15
RE1, 2
I
Rotary encoder input 1, 2
16
SEEK
O
SEEK output
17 – 20
NC
—
Not used.
21
GND3
—
GND
22 – 24
KEYIN3 – 1
I
A/D key input 3 – 1
25
ROT-IN
I
Rotary commander input
26
S-METER
I
FM and AM common signal meter A/D conversion input
27
TEST-SW
I
TEST mode select input
28
AM-IFC
I
AM center frequency input
29
FM-IFC
I
FM center frequency input
30
VDD2
—
Power supply (+5 V)
31
VCOH-FM
I
Local oscillation frequency input (FM)
32
VCOL-AM
I
Local oscillation frequency input (AM)
33
GND2
—
GND
34
NC
—
Not used.
35
EO1-PDOUT
O
Error out output
36
TESTO
—
Fixed at “L”.
37
AM-ON(TU-ON)
O
AM power output (AM select)
38
FM-ON(FM/AM)
O
FM power output (FM select)
39
LCL/DX
O
LOCAL/DX select (“H” : LOCAL, “L” : DX)
40
BEEP
O
BEEP output
41
ACC-IN
I
Accessory input
42
SCOR
I
SUBQ data read request
43
MUTE
O
System mute output
44
AMP-MUTE
O
Power amplifier mute output
45
TEL-MUTE
O
Telephone mute output
46
NC
—
Not used.
47
VOL-CE
O
Electric volume chip select
48
VOL-CLK
O
Electric volume serial clock
49
VOL-DATA
O
Electric volume serial data
50
EMPHO
O
De-emphasis control output
51
PW-ON
O
System power control
52
MD-ON
O
Loading motor power
53
CD-ON
O
Servo drive power
54
ILL-ON
O
Illumination output
55, 56
MOD1, 2
O
Bus boost control 1, 2
57
NC
—
Not used.
58
LCD-CE
O
LCD drive chip select output
SECTION 4
DIAGRAMS
– 20 –
Pin No.
Pin Name
I/O
Pin Description
59
EZ-SEL
I
SHIFT + input
60
SENS
I
Information input from servo IC.
61
FOK
I
Focus OK input
62
LD-ON
O
Laser diode control
63
NC
—
Not used. (Connect to GND.)
64
ST/MONO
I/O
Used for both STEREO indicator display input and force MONO output. (FM)
65
LCD-CKO
O
LCD driver serial clock output
66
LCD-SO
O
LCD driver serial data output
67
C.ALARM
O
Caution alarm output
68
SQ-CKO
O
Q data read serial clock output
69
CD-RST
O
Servo IC/DAC reset output
70
SQ-SI
I
Q data input
71
CD-SO
O
Serial data output to servo IC.
72
CD-LAT
O
Data latch output to servo IC.
73
CD-CKO
O
Serial clock output to servo IC.
74
VREF
—
Not used.
75
GND1
—
GND
76
X-OUT
—
Crystal oscillator connection (4.5 MHz)
77
X-IN
I
Crystal oscillator connection (4.5 MHz)
78
BU-IN
I
Back-up detection
79
VDD1
—
Power supply (+5 V)
80
RESET
I
RESET input
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