Sony CDX-4180 Service Manual ▷ View online
– 13 –
2-7. CHASSIS (T) SUB ASSY
2-8. LEVER ASSY
4
chassis (T) sub assy
2
P 2x3
3
P 2x3
1
Unsolder the
lead wires.
red
white
black
4
claws
2
DISC IN SW board
7
lever (L) assy
3
tension spring (LR)
6
lever (R) assy
5
guide (disc)
1
PS 2x4
– 14 –
2-9. SERVO BOARD
2-10. ROLLER ASSY
• When installing, take note of the positions
arm (roller) and washers. (Fig. 1)
arm (roller) and washers. (Fig. 1)
5
PS 2x4
1
CN3
3
P 2x3
4
loading motor assy
7
SERVO board
2
CN2
6
PS 2x4
Fig. 1
4
PS 2x3
5
LOAD SW board
1
tension spring (RA)
2
arm (roller)
3
roller assy
washer
arm
arm
washer
washers
– 15 –
2-11. CHASSIS (OP) (O/S) ASSY
2-12. OPTICAL PICK-UP BLOCK
1
P 2x3
2
sled motor assy
3
optical pick-up block
1
tension spring (angle)
8
compression spring (FL)
7
chassis (OP) (O/S) assy
9
compression spring (FL)
2
tension spring (KR1)
5
Fit lever (D) in the
direction of the arrow.
3
damper (T)
4
damper (T)
6
Turn loading ring in the
direction of the arrow.
– 16 –
FM SENS/IF Adjustment
Setting:
SOURCE button
: FMI
D-BASS switch
: OFF
Frequency Select switch (E model) : FM 200K
Procedure:
Adjust for a maximum reading on level meter.
FEB1
87.5 MHz
Adjustment Location: See page 17.
AM SENS Adjustment
Setting:
SOURCE
n MODE button
: AM
D-BASS switch
: OFF
Frequency Select switch (E model) : AM 10K
SECTION 3
ELECTRICAL ADJUSTMENTS
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 (E model) : 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 17.
Procedure:
1. Adjust IFT4 on TU01 so that the reading on the digital voltmeter
1. Adjust IFT4 on TU01 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 LINE OUT REAR jack is –20 dBs.
3. Change the FM RF signal generator frequency and check the
deviation of the frequency on + side and – side when the LINE
OUT REAR jack drops 3 dB. (Both + side and – side is approx.
50 kHz.)
OUT REAR jack drops 3 dB. (Both + side and – side is approx.
50 kHz.)
4. Re-adjust IFT4 on TU01 when the difference deviation of the
frequency does more than 10 kHz.
Adjustment Location: See page 17.
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