DOWNLOAD Sony CX-LEM300 / XR-EM300 Service Manual ↓ Size: 3.22 MB | Pages: 40 in PDF or view online for FREE

Model
CX-LEM300 XR-EM300
Pages
40
Size
3.22 MB
Type
PDF
Document
Service Manual
Brand
Device
Car Audio
File
cx-lem300-xr-em300.pdf
Date
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Sony CX-LEM300 / XR-EM300 Service Manual ▷ View online

13
CX-LEM300
Tape Speed Check
Mode: Playback
1. Insert the WS-48B into the deck.
2. Press the N button on the deck.
3. Confirm that the frequency counter reads 3,000 ± 90 Hz.
Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)
(WS-48B)
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
3. Mode: Playback
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
position
R-CH
peak
set
test tape
P-4-A100
(10 kHz, – 10 dB)
R-CH
oscilloscope
L-CH
R-CH
V
H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
MAIN board
SPEAKER terminal (J302)
L-CH
+
–
set
test tape
WS-48B 
(3 kHz, 0 dB)
MAIN board
SPEAKER terminal (J302)
L-CH, R-CH
frequency counter
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode: Playback
Adjustment Location: Record/Playback/Erase Head
set
MAIN board
SPEAKER terminal (J302)
L-CH, R-CH
+
–
level meter
test tape
P-4-A100
(10 kHz, – 10 dB)
Note: Refer to “3-6. Cassette Door Assy” (see page 10)
adjustment screw
14
CX-LEM300
       RFDC signal waveform
Checking Location: CD board (Conductor side)
RFAC Level Check
Connection:
Procedure:
1.
Connect an oscilloscope to test point TP (RFAC) and TP (VC)
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.
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)
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
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.
Connect an oscilloscope to test point TP (FE) and TP (DVC)
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)
4.
Check the oscilloscope waveform (S-curve) is symmetrical
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)
RFDC Level Check
Connection:
Procedure:
1.
Connect an oscilloscope to test point TP (RFDC) and TP (DVC)
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.
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 
level: 0.7 
±
 0.2 Vp-p
+
–
CD board
TP (RFAC)
TP (VC)
oscilloscope
VOLT/DIV: 200 mV
TIME/DIV: 500 ns 
level: 0.9 
±
 0.4 Vp-p
Checking Location:
– CD BOARD (Conductor Side) –
TP (VC)
TP (FE)
TP (TE)
TP
 (RFDC)
TP
 (DVC)
TP
 (RFAC)
IC103
IC101
15
CX-LEM300
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.)
For schematic diagrams.
Note:
• All capacitors are in µF unless otherwise noted.  pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in 
Ω
 and 
1
/
4
 
W or less unless otherwise
specified.
•
f
: internal component.
•
2
: nonflammable resistor.
•
1
: fusible resistor.
•
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.
•
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.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: TUNER
J
: CD
d
: AUX
E
: PB (TAPE)
a
: REC (TAPE)
Note: The components identified by mark 
0
 or dotted line
with mark 
0
 are critical for safety.
Replace only with part number specified.
CD board
MAIN board
REGULATOR board
POWER board
CONTROL board
16
CX-LEM300
• Waveforms
– CD Board –
1.1Vp-p
1
 IC103 
qg
(RFAC)
(CD Play Mode)
2
 IC101 
el
(FE)
(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)
4
 IC101 
yj
(XTAO)
5.4Vp-p
59ns
6
 IC801 
qh
(8.6MHz-EXTAL)
1V/DIV, 40ns/DIV
1V/DIV, 10 
µ
s
/DIV
5
 IC801 
qd
 (32.768kHz)
5.4Vp-p
30.5 
µ
s
4.0Vp-p
116ns
7
 Q307 collector (Rec mode)
5V/DIV, 4 
µ
s
/DIV
14.1Vp-p
10.7 
µ
s
– CONTROL Board –
– MAIN Board –
Page of 40
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