Sony CDX-3170 Service Manual ▷ View online
– 13 –
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.
– 14 –
SECTION 3
ELECTRICAL ADJUSTMENTS
TUNER SECTION
Cautions during repair
When the tuner unit is defective, replace it by a new one be-
cause its internal block is difficult to repair.
cause its internal block is difficult to repair.
0 dB = 1
µ
V
FM VT Voltage Adjustment
Setting :
SOURCE button : FMI
FM Center Adjustment
Setting :
SOURCE button : FMI
Procedure :
Adjust for following value reading on digital voltmeter.
Frequency Display
87.5 MHz
107.9 MHz
Reading on Digital voltmeter
1.42
±
0.05 V
7.2
±
0.5 V
Adjustment Part
T4
(confirmation)
Adjustment Location : See page 17.
Procedure :
1. Adjust T5 on TU1 so that the reading on the digital voltmeter
1. Adjust T5 on TU1 so that the reading on the digital voltmeter
becomes in 0
±
50 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 T5 on TU1 when the difference deviation of the
frequency does more than 10 kHz.
Adjustment Location : See page 17.
Carrier frequency : 97.9 MHz
Output level
Output level
: 60 dB (1 mV)
Mode
: mono
Modulation
: 1 kHz, 75 kHz deviation (100 %)
FM RF signal
generator
dummy
antenna
antenna
terminal
terminal
set
50
Ω
50
Ω
digital
voltmeter
FM VT OUT
+
–
FM RF signal
generator
dummy
antenna
antenna
terminal
terminal
set
50
Ω
50
Ω
digital
voltmeter
+
–
FM CENTER
OUT
(Both side or R32.)
IC2 pin
!‹
IC2 pin
!‡
0 dBs
–3 dBs
(fc–10) fc
(fc+10) (kHz)
– 15 –
Carrier frequency : 97.9 MHz
Output level
Output level
: 22 dB (12.6
µ
V)
Mode
: mono
Modulation
: 1 kHz, 22.5 kHz deviation (30 %)
FM Auto Scan/Stop Level Adjustment
Setting :
SOURCE button : FMI
Procedure :
Adjust for following value reading on digital voltmeter.
Frequency Display
530 kHz
1,710 kHz
Reading on Digital voltmeter
1.43
±
0.05 V
6.8
±
0.5 V
Adjustment Part
T9
(confirmation)
Adjustment Location : See page 17.
Procedure :
1. Adjust RV3 on TU1 so that the reading on the digital voltmeter
1. Adjust RV3 on TU1 so that the reading on the digital voltmeter
changes point from minimum to maximum. (approx. 0.6 V)
2. Confirm that the set stops auto-scanning with FM RF signal
generator output level set at 22
±
2 dB.
Adjustment Location : See page 17.
AM VT Voltage Adjustment
Setting :
SOURCE
nMODE button : AM
FM SENS/IF Adjustment
Setting :
SOURCE button : FMI
Procedure :
Adjust for a maximum reading on level meter.
T1–T3
87.5 MHz
Adjustment Location : See page 17.
FM RF signal
generator
dummy
antenna
antenna
terminal
terminal
set
LINE OUT REAR
50
Ω
50
Ω
10 k
Ω
level
meter
+
–
FM RF signal
generator
dummy
antenna
antenna
terminal
terminal
set
50
Ω
50
Ω
digital
voltmeter
FM SD OUT
+
–
AM RF signal
generator
set
LINE OUT REAR
30
Ω
10 k
Ω
dummy
antenna
antenna
terminal
terminal
level
meter
15 pF
60 pF
+
–
digital
voltmeter
AM VT OUT
+
–
AM IF Adjustment
Setting :
SOURCE
nMODE button : AM
Procedure :
Adjust for a maximum reading on level meter.
T8
450 kHz
Adjustment Location : See page 17.
AM RF signal
generator
set
LINE OUT REAR
30
Ω
10 k
Ω
dummy
antenna
antenna
terminal
terminal
level
meter
15 pF
60 pF
+
–
– 16 –
AM Auto Scan/Stop Level Adjustment
Setting :
SOURCE
nMODE button : AM
AM SENS Adjustment
Setting :
SOURCE
nMODE button : AM
Procedure :
Adjust for a maximum reading on level meter.
T6, T7
530 kHz
Adjustment Location : See page 17.
Procedure :
1. Adjust RV4 on TU1 so that the reading on the digital voltmeter
1. Adjust RV4 on TU1 so that the reading on the digital voltmeter
changes point from minimum to maximum. (approx. 0.6 V)
2. Confirm that the set stops auto-scanning with AM RF signal
generator output level set at 33
±
4 dB.
Adjustment Location : See page 17.
Carrier frequency : 1000 kHz
30% amplitude
modulation by
400 Hz signal
output level : 30 dB (31.6
30% amplitude
modulation by
400 Hz signal
output level : 30 dB (31.6
µ
V)
AM RF signal
generator
set
LINE OUT REAR
30
Ω
10 k
Ω
dummy
antenna
antenna
terminal
terminal
level
meter
15 pF
60 pF
+
–
AM RF signal
generator
set
LINE OUT REAR
30
Ω
10 k
Ω
dummy
antenna
antenna
terminal
terminal
level
meter
15 pF
60 pF
+
–
digital
voltmeter
AM VT OUT
+
–
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