Sony CMT-EP414 / HCD-EP414 Service Manual ▷ View online
13
HCD-EP414
RFDC signal waveform
Checking Location: CD board (Conductor side)
RFAC Level Check
Connection:
Procedure:
1.
1.
Connect an oscilloscope to test point TP (RFAC) and TP (VC)
on the CD board.
on the CD 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: CD board (Conductor side) (See page 14)
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 TP (FE) and TP (DVC)
on the CD board.
on the CD 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
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: CD board (Conductor side) (See page 14)
RFDC Level Check
Connection:
Procedure:
1.
1.
Connect an oscilloscope to test point TP (RFDC) and TP (DVC)
on the CD board.
on the CD 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.
+
–
–
CD board
TP (FE)
TP (DVC)
oscilloscope
A
B
symmetry
within 2
±
1 Vp-p
+
–
–
CD board
TP (RFDC)
TP (DVC)
oscilloscope
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
level: 1.15
±
0.35 Vp-p
+
–
–
CD board
TP (RFAC)
TP (VC)
oscilloscope
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
level: 1.35
±
0.4 Vp-p
SECTION 5
ELECTRICAL ADJUSTMENTS
14
HCD-EP414
Checking Location:
– CD BOARD (Conductor Side) –
TP (VC)
TP (FE)
TP (TE)
TP
(RFDC)
TP
(DVC)
TP
(RFAC)
IC103
IC101
15
HCD-EP414
SECTION 6
DIAGRAMS
• Circuit Boards Location
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
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
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.
•
C
: panel designation.
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.
• Indication of transistor
•
A
: B+ Line.
•
B
: B– Line.
• 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.
• Abbreviation
• Abbreviation
AUS : Australian model
MX : Mexican model
MX : Mexican model
• Signal path.
F
: TUNER
J
: CD
d
: AUX
E
: PB (TAPE)
a
: REC (TAPE)
CD board
MAIN board
REGULATOR board
BACK LIGHT board
POWER board
CONTROL board
HEADPHONE board
Note:
The components identified by
mark
The components identified by
mark
0
or dotted line with mark
0
are critical for safety.
Replace only with part number
specified.
specified.
C
B
These are omitted.
E
Q
16
HCD-EP414
• Waveforms
– CD Board –
– CD Board –
1.1Vp-p
1
IC103
qg
(RFAC)
(CD Play Mode)
(CD Play Mode)
2
IC101
el
(FE)
(CD Play Mode)
(CD Play Mode)
200mV/DIV, 1
µ
s
/DIV
50mV/DIV, 200
µ
s
/DIV
100mV/DIV, 200
µ
s
/DIV
1V/DIV, 20ns/DIV
200mVp-p
250mVp-p
3
IC101
ra
(TE)
(CD Play Mode)
(CD Play Mode)
4
IC101
yj
(XTAO)
5.4Vp-p
59ns
6
IC801
qh
(CF2)
1V/DIV, 40ns/DIV
1V/DIV, 10
µ
s
/DIV
5
IC801
qd
(XT2)
4.8Vp-p
30.5
µ
s
4.0Vp-p
116ns
7
Q307 collector (Rec mode)
5V/DIV, 4
µ
s
/DIV
11.3Vp-p
12.3
µ
s
– CONTROL Board –
– MAIN Board –
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