Sony CX-LFAV500 / XR-FAV500 Service Manual ▷ View online
17
CX-LFAV500
RFDC signal waveform
Checking Location: BD board (Conductor side)
RFAC Level Check
Connection:
Procedure:
1.
1.
Connect an oscilloscope to test point TP6 (RFAC) and TP7
(VC) on the BD board.
(VC) on the BD board.
2.
Turn the power on.
3.
Put the disc (YEDS-18) in to playback the number five track.
4.
Confirm that oscilloscope waveform is clear and check RFAC
signal level is correct or not.
signal level is correct or not.
Note:
A clear RFAC signal waveform means that the shape “
◊” can be
clearly distinguished at the center of the waveform.
RFAC signal waveform
Checking Location: BD board (Conductor side)
CD SECTION
Note:
1. CD Block is basically designed to operate without adjustment. There-
fore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M
3. Use an oscilloscope with more than 10M
Ω impedance.
4. Clean the object lens by an applicator with neutral detergent when the
signal level is low than specified value with the following checks.
S-curve Check
Connection:
Procedure:
1.
1.
Connect an oscilloscope to test point TP4 (FE) and TP7 (VC)
on the BD board.
on the BD board.
2.
Turn the power on.
3.
Put the disc (YEDS-18) in and turned power switch on again
and actuate the focus search. (actuate the focus search when
disc table is moving in and out)
and actuate the focus search. (actuate the focus search when
disc table is moving in and out)
4.
Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 2 ± 1
Vp-p.
between A and B. And confirm peak to peak level within 2 ± 1
Vp-p.
S-curve waveform
Note:
• Try to measure several times to make sure than the ratio of A : B
or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the
brightness to obtain best waveform.
Checking Location: BD board (Conductor side)
RFDC Level Check
Connection:
Procedure:
1.
1.
Connect an oscilloscope to test point TP6 (RFDC) and TP7
(VC) on the BD board.
(VC) on the BD board.
2.
Turn the power on.
3.
Put the disc (YEDS-18) in to playback the number five track.
4.
Confirm that oscilloscope waveform is clear and check RFDC
signal level is correct or not.
signal level is correct or not.
Note:
A clear RFDC signal waveform means that the shape “
◊” can be
clearly distinguished at the center of the waveform.
+
–
–
BD board
TP4 (FE)
TP7 (VC)
oscilloscope
A
B
symmetry
within 2
±
1 Vp-p
+
–
–
BD board
TP6 (RFDC)
TP7 (VC)
oscilloscope
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
level: 0.7
±
0.2 Vp-p
+
–
–
BD board
TP6 (RFAC)
TP7 (VC)
oscilloscope
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
level: 1.0
±
0.4 Vp-p
18
CX-LFAV500
Connecting Location:
– BD BOARD (Conductor Side) –
IC101
TP7
(VC)
(VC)
IC103
RV101
E-F Balance
(1 Track Jump)
Adjustment
E-F Balance
(1 Track Jump)
Adjustment
TP8
(RFAC)
(RFAC)
TP6
(RFDC)
(RFDC)
TP4
(FE)
(FE)
TP2
(TE)
(TE)
+
–
–
BD board
TP2 (TE)
TP7 (VC)
oscilloscope
Traverse Waveform
0V
B
level: 1.0
±
0.5 Vp-p
Center of
the waveform
the waveform
A (DC
voltage)
Traverse Waveform
0V
Tracking servo
Sled servo
ON
C (DC
voltage)
voltage)
Tracking servo
Sled servo
OFF
6.
Press the CD
u
button. (The tracking servo and sledding
servo are turned ON)
Rotate RV101 on BD board and adjust the C (DC voltage)
is almost equal to the A (DC voltage) in step 4.
Rotate RV101 on BD board and adjust the C (DC voltage)
is almost equal to the A (DC voltage) in step 4.
7. To exit from this mode, turn the power off.
Notes:
• Always move the optical pick-up to most inside track when
exiting from this mode. Otherwise, a disc will not be unloaded.
• Do not run the sled motor excessively, otherwise the gear can
be chipped.
E-F Balance Adjustment
Connection:
Procedure:
1.
1.
Connect an oscilloscpe to test point TP2 (TE) and TP7 (VC)
on the BD board.
on the BD board.
2.
AC is put in pushing CD
u
button to enter the CD test
mode.
3.
Put the disc (YEDS-18) in to playback the number five track.
4.
Press the button. If it plays, press the
CD
u
button again. (The tracking servo and the sledding servo are
turned OFF)
turned OFF)
5.
Check the level B of the oscilliscope's waveform and the A
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than
± 10%
CD
u
19
19
CX-LFAV500
• Waveforms
– BD Board –
– BD Board –
7
Q301 collector (Rec mode)
5V/DIV, 5
µ
s
/DIV
11.8Vp-p
11.2
µ
s
– MAIN Board –
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
For schematic diagrams.
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
∗
: Impossible to measure
•
f
: internal component.
•
2
: nonflammable resistor.
•
C
: panel designation.
•
H
: adjustment for repair.
For printed wiring boards.
Note:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
•
f
: internal component.
•
: Pattern from the side which enables seeing.
•
A
: B+ Line.
•
B
: B– Line.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: TUNER
J
: CD
d
: AUX
E
: PB (TAPE)
a
: REC (TAPE)
L
: VIDEO
: MIC
: MIC
• Abbreviation
MY
: Malaysia model.
SP
: Singapore model.
TH
: Thai model.
• Indication of transistor
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(Side B)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Side A)
the parts face are indicated.
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
C
B
These are omitted.
E
Q
B
These are omitted.
C
E
Q
B
These are omitted.
C
E
Q
1.0
±
0.4Vp-p
1
IC103
qg
(RFAC)
(CD Play Mode)
(CD Play Mode)
2
IC101
qh
(FE)
(CD Play Mode)
(CD Play Mode)
200mV/DIV, 1
µ
s
/DIV
100mV/DIV,
200
µ
s
/DIV
500mV/DIV, 200
µ
s
/DIV
Approx.
360mVp-p
360mVp-p
Approx.
1.2Vp-p
1.2Vp-p
0.6
±
0.15Vp-p
4
IC103
wk
(RFDC)
(CD Play Mode)
(CD Play Mode)
100mV/DIV, 1
µ
s
/DIV
3
IC101
qk
(TE)
(CD Play Mode)
(CD Play Mode)
5
IC101
us
(XTAO)
1V/DIV, 20ns/DIV
3.7Vp-p
59.1ns
• Circuit Boards Location
MAIN BOARD
BD BOARD
LOADING BOARD
HP/MIC JACK BOARD
FRONT BOARD
SECTION 7
DIAGRAMS
V-OUT BOARD
MIC/ECHO BOARD
PT BOARD
VCD BOARD
6
IC802
ua
(XOUT)
1V/DIV, 10ns/DIV
4.6Vp-p
37 ns
9
IC601
qh
(X OUT)
1V/DIV, 10
µ
s
/DIV
8
IC601
qd
(XT2)
5.2Vp-p
30.6
µ
s
1V/DIV, 50ns/DIV
2.4Vp-p
115ns
– FRONT Board –
– VCD Board –
20
20
CX-LFAV500
7-1. BLOCK DIAGRAM – BD SECTION –
: CD
• Signal Path
OPTICAL PICK-UP
BLOCK
PD1
PD2
I5-10
I1-6
LD
VC
VCC
7
5
3
1
2
4
+3.3V
GND
IL-SW
PD
VR
LD
DRIVE
FOCUS
COIL
TRACKING
COIL
Q101
RF AMP
IC103
VC
27
A
6
B
7
C
8
D
9
E
10
F
11
LD
1
PD
2
IC102
MOTOR/COIL DRIVE
VO1+
52
VO1-
47
VO2+
56
VO2-
55
VO3+
2
VO3-
1
M
(SLED)
M102
M101
VO4+
10
VO4-
5
M
(SPINDLE)
F+
F-
T+
T-
35
IN1+
34
IN1-
32
IN2+
31
IN2-
27
IN3+
26
IN3-
24
IN4R
8
STBY
MDP
25
SRDR
30
SFDR
29
TRDR
32
TFDR
31
FRDR
34
FFDR
33
DIGITAL SIGNAL PROC.
IC101
DIGITAL SERVO
RFAC
50
29
RFDCI
28
RFDC
16
FE
17
FEI
12
SW
TE_BAL
RFDC
43
FE
39
TE
41
SE
40
SSTP
26
66
PCMD
4
DATA
16.9344MHz
6
CLOK
5
XLAT
DATA
XLAT
77
SQCK
SQCK
8
SCLK
15
SCOR
76
SQSO
2
XRST
XRST
RF-SW
PWM3
PWM2
PWM1
7
SENS
SCOR
SQSO
SENS
14
C2PO
C2PO
15
RF AC
18
TE
67
BCLK
65
LRCK
13
GFS
22
FOK
PCMD
CLK
BCLK
LRCK
GFS
FOK
71
XTAI
72
XTAO
19
RV101
X201
AVDD(3.3V)
A
VCD
SECTION
B
VCD
SECTION
C
VCD
SECTION
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