Sony CDX-4480ESP Service Manual ▷ View online
– 17 –
SECTION 3
ELECTRICAL ADJUSTMENTS
FM SENS/IF Adjustment
Setting:
SOURCE button
: FMI
D-BASS switch
: OFF
FREQUENCY SELECT switch : FM 200K
Procedure:
Adjust for a maximum reading on level meter.
FEB1
87.5 MHz
Adjustment Location: See page 18.
AM SENS Adjustment
Setting:
SOURCE
n MODE button
: AM
D-BASS switch
: OFF
FREQUENCY SELECT switch : AM 10K
CD SECTION
CD section adjustments are done automatically in this set.
TUNER SECTION
0 dB = 1
µ
V
Cautions during repair
When the tuner unit is defective, replace it by a new one because
its internal block is difficult to repair.
its internal block is difficult to repair.
FM Center Adjustment
Setting:
SOURCE button
: FMI
D-BASS switch
: OFF
FREQUENCY SELECT switch : FM 200K
FM RF signal
generator
dummy
antenna
antenna
terminal
terminal
set
50
Ω
50
Ω
Carrier frequency: 97.9 MHz
Output lever
Output lever
: 60 dB (1 mV)
Mode
: mono
Modulation
: 1 kHz, 75 kHz deviation (100%)
+
–
FM CENTER
OUT
(Both side
of R24.)
IC1 pin
#¶
IC1 pin
#¢
digital
voltmeter
voltmeter
0 dBs
–3 dBs
(fc–10)
fc
(fc+10)
(kHz)
FM RF signal
generator
dummy
antenna
50
Ω
50
Ω
4
Ω
antenna
terminal
terminal
set
SPEAKER OUT
+
–
level
meter
meter
AM RF signal
generator
dummy
antenna
antenna
terminal
terminal
set
SPEAKER OUT
level
meter
meter
+
–
30
Ω
4
Ω
15 pF
30 pF
Procedure:
Adjust for a maximum reading on level meter.
IFT1, 3
1,400 kHz
Adjustment Location: See page 18.
Procedure:
1. Adjust IFT4 on TU1 so that the reading on the digital voltmeter
1. Adjust IFT4 on TU1 so that the reading on the digital voltmeter
becomes in 0
±
30 mV.
2. Output an Fcenter 10 dB signal output from FM RF signal
generator so that the speaker out terminal is –20 dBs.
3. Change the FM RF signal generator frequency and check the
deviation of the frequency on + side and – side when the speaker
out terminal drops 3 dB. (Both + side and – side is approx.
50 kHz.)
out terminal drops 3 dB. (Both + side and – side is approx.
50 kHz.)
4. Re-adjust IFT4 on TU1 when the difference deviation of the
frequency does more than 10 kHz.
Adjustment Location: See page 18.
– 18 –
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 TU1 so that the reading on the digital
1. Adjust IFT3 on TU1 so that the reading on the digital
voltmeter is 1.5
±
0.2 V.
Adjustment Location: tuner assy (TU1)
AM Auto Scan/Stop Level Adjustment
Setting:
SOURCE
n MODE button
: AM
D-BASS switch
: OFF
FREQUENCY SELECT switch : 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 assy (TU1)
– tuner assy (TU1) (component side) –
AM AUTO
SCAN/STOP
LEVEL ADJ
IFT3
AM SENS
ADJ
IFT3 IFT1
FEB1
FM SENS/IF
ADJ
IFT4
FM CENTER
ADJ
– tuner assy (TU1) (conductor side) –
IC1
R24
S-METER
OUT
FM CENTER
OUT
OUT
‘
’
– 19 –
SECTION 4
DIAGRAMS
4-1. IC PIN DESCRIPTIONS
• IC5 CXP84640-003Q (CD SYSTEM CONTROL)
• IC5 CXP84640-003Q (CD SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Pin Description
1 – 7
NCO
—
Not used in this set.
8
LINKOFF
I
Bus interface link input (Not used in this set.)
9
DRV OE
O
Focus/tracking coil/sled motor control output
10
D SW
I
Down switch input (SW4)
11 – 13
NCO
—
Not used in this set.
14
LM EJ
O
Loading motor control output
15
LM LOD
O
Loading motor control output
16
EMPH O
O
De-emphasis ON/OFF control output
17
CDMON
O
CD mechanism deck power control output
18
CD ON
O
CD power control output
19
A MUT
O
System attenuate control output
20
LD ON
O
Lazer power ON/OFF control output
21
CD RST
O
CD system reset output
22 – 24
—
—
Not used in this set.
25
PH3
I
Not used in this set.
26
TSTIN0
I
Not used in this set.
27
TSTIN1
I
Not used in this set.
28
TST CLV
I
Not used in this set.
29
NCO
—
Not used in this set.
30
RESET
I
System reset input (“L” = Reset)
31
X IN
I
X’tal oscillator input of system clock. (10 MHz)
32
X OUT
O
X’tal oscillator output of system clock. (10 MHz)
33
GND
—
Analog GND
34
XT OUT
O
Not used in this set.
35
XT IN
I
Not used in this set.
36
AVSS
—
A/D converter GND
37
AVREF
I
A/D converter reference voltage input
38
TEP L
I
Not used in this set.
39
TEP H
I
Not used in this set.
40
NCO
—
Not used in this set.
41
PH2
I
Not used in this set.
42
SCLK
O
CD-TEXT data read clock output
43
ESPXQOK
O
XQOK signal output to DRAM controller.
44
ESPSDT
I
Serial data input from DRAM controller.
45
GRSRST
O
Reaet signal output to DRAM controller.
46
GRSCOR
I
Sub-cord sync input from DRAM controller.
47
CD XLAT
O
CD signal process serial latch output
48
TX CLK
O
EEPROM serial clock output (Not used in this set.)
49
TX DATA
O
EEPROM serial data output (Not used in this set.)
50
UNISO
O
Not used in this set.
51
BUS CLK
I/O
Bus system serial clock input/output
52
BUS SI
I
Bus system serial interface input
53
BUS SO
O
Bus system serial interface output
54
F OK
I
Focus OK signal input
55
GFS
I
GFS signal detection input
56
SCOR
O
Sub-cord sync output
57
SENS
I
SENS signal input
58
—
I
Fixed at “H” in this set.
59
CD CKO
O
CD signal process serial clock output
60
BU.IN
I
Back-up power detection input
61
BUSON
I
Bus on control input
– 20 –
Pin No.
Pin Name
I/O
Pin Description
62
IN SW
I
Disc in switch input (SW1)
63
SELF SW
I
Self switch input (SW2)
64
TX CE
O
EEPROM chip enable output (Not used in this set.)
65
SCK2
O
Sub Q read clock output
66
SI2
I
Sub Q 80 bit, PCM peak and level data 16 bit input
67
CD DATA
O
CD signal process serial data output
68
ESPXWRE
O
Write signal output to DRAM controller.
69
ESPXRDE
O
Read signal output to DRAM controller.
70
ESPXLT
O
Serial data latch output to DRAM controller.
71
ESPXSOE
O
XSOE signal output to DRAM controller.
72
VDD
—
Power supply
73
HIN
I
Fixed at “H” in this set.
74
TEXT.ON/OFF
I
Fixed at “H” in this set.
75
PH1
I
Not used in this set.
76
FBTBSEL
I
Not used in this set.
77
CDOSEL
I
Not used in this set.
78 – 80
—
—
Not used in this set.
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