Sony CDX-3170 Service Manual ▷ View online
– 17 –
Adjustment Location : tuner assy (TU1)
–tuner assy (TU1) (conductor side)–
–tuner assy (TU1)
(component side)–
(component side)–
4
10
19
18
1
36
19
IC2
R32
FM VT
OUT
’
‘
SEEK
(at FM AUTO SCAN/
STOP LEVEL ADJ,
add the +5 Vdc.
AM VT
OUT
FM CENTER
OUT
(Both side of R32.)
AM VT
VOLTAGE
ADJ
T9
AM/AUTO
SCAN/STOP
LEVEL ADJ
RV4
AM IF
ADJ
T8
AM SENS
ADJ
T7
T6
RV3
FM AUTO
SCAN/STOP
LEVEL ADJ
T5
FM CENTER
ADJ
T4
FM VT
VOLTAGE
ADJ
T2
T3
T1
T3
T1
FM
SENS/IF
ADJ
– 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 (S900) 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 (S900) 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
• IC800
• IC800
µ
PD17017GF-B28-3B9 (SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Pin Description
1
CD SO/VOL DATA
O
CD serial data/electric volume serial data output pin
2
VOL CLK
O
Electric volume serial clock output pin
3
SENSE
I
CD sens signal input pin
4
ST/MONO
O
FM/AM select pin
5
ACC
I
Accessory power (ACC) voltage detection pin
6
FOK
I
Focus OK signal input pin
7
CD-LAT
O
CD latch signal output pin
8
SQCKO
O
Sub code Q data read clock output pin
9
CD RST
O
CD reset signal output pin
10
SQ SI
I
Sub code Q data input pin
11
NC
—
Not used. (Connect to GND.)
12
SCOR
I
Sub code sync detection signal input pin
13
BUIN
I
Power for operation (BATT) voltage detection pin
14
CDMON
O
Mechanism deck section power supply control pin
15
ILL ON
O
Illumination power supply control pin
16
LD ON
O
Laser power ON/OFF control pin
17
FM/AM
O
FM/AM select pin
18
SEEKOUT
O
SEEK OUT signal output pin
19
PW-ON
O
System power supply control pin
20
LCL/DX
O
LOCAL/DX select pin
21
BEEP
O
Beep sound output pin
22
VOL CE
O
Electric volume serial chip enable output pin
23
LM EJ
O
Loading motor control pin (Eject direction)
24
LM LOD
O
Loading motor control pin (Loading direction)
25
MUTE
O
Audio mute signal output pin
26
FM IF
I
FM IF counter input pin (Not used in this set.)
27
AM IF
I
AM IF counter input pin
28
NOSE SW
I
Front panel with/without detection input pin
29
SD/ST
I
During SEEK operation, station detection input pin.
30
VDD1
—
Power supply pin
31
VCOL
I
AM OSC signal input pin
32
VCOH
I
FM OSC signal input pin
33
GND
—
GND
34
XOUT
O
System clock output pin (4.5 MHz)
35
XIN
I
System clock input pin (4.5 MHz)
36
EO0
O
Charge pump output pin
37
EO1
—
Not used.
38
NC
—
Not used. (Fixed at “L”.)
39, 40
NC
—
Not used.
41
VDD2
—
Power supply pin
42
EMPH.O
O
De-emphasis control pin
43, 44
COM1, COM0
O
Not used.
45
LCDSO
O
LCD serial data output pin
46
LCDCKO
O
LCD serial clock output pin
47
LCDINH
O
LCD blank display control output pin
48
LCDCE
O
LCD chip enable output pin
49 – 64
LCD25 – LCD10
O
Not used.
65
TEST SW
I/O
Test mode direct settig input
66
BAND SW
I/O
Not used.
67
AREA2 SW
O
Not used.
68
AREA1 SW
I/O
Not used.
SECTION 4
DIAGRAMS
– 20 –
Pin No.
Pin Name
I/O
Pin Description
69
SK IN
I
Not used.
70
DK IN
I
Not used.
71
SELF SW
I/O
SELF SW input/LCD segment signal output pin
72
IN SW
I/O
DISC IN SW input/LCD segment signal output pin
73
L SW
I/O
LIMIT SW input/LCD segment signal output pin
74
D SW
I/O
DOWN SW input/LCD segment signal output pin
75
KEY-RETURN
I
Key return signal input pin
76 – 78
AD2 – AD0
I
Key input pin (A/D input)
79
AMP MUTE
O
Power amplifier mute signal output pin
80
CD CKO
O
CD serial clock output pin
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