CDX-C4750, CDX-C6600 - Sony Car Audio Service Manual (repair manual). Page 13

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– 13 –
2-7. CHASSIS (T) SUB ASSY
2-8. LEVER ASSY
5
 chassis (T) sub assy
3
 P 2x3
4
 P 2x3
1
 Unsolder the
     lead wires.
red
white
black
2
 P 2x3
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
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
 tension spring (KF1)
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.
1
 P 2x3
2
 sled motor assy
3
 optical pick-up block
– 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.
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
set
50 
50 
Carrier frequency: 97.9 MHz
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
0 dBs
–3 dBs
(fc–10)
fc
(fc+10)
(kHz)
FM RF signal
generator
dummy
antenna
50 
50 
antenna
terminal
set
SPEAKER OUT
+
level
meter
AM RF signal
generator
dummy
antenna
antenna
terminal
set
SPEAKER OUT
level
meter
+
30 
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 TU601 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 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 drops 3 dB. (Both + side and – side is approx. 50 kHz.)
4. Re-adjust IFT4 on TU601 when the difference deviation of the
frequency does more than 10 kHz.
Adjustment Location: See page 17.

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