Sony CMT-EP30 / CMT-EP40 / HCD-EP30 / HCD-EP40 Service Manual ▷ View online
13
HCD-EP30/EP40
no mark : US, Canadian, E, Australian models
< > : AEP, UK models
< > : AEP, UK models
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
Confirmation
530 kHz
1.5
±
0.2 V
<531 kHz>
T102
1,710 kHz
7.7
±
0.3 V
<1,602 kHz>
<7.3
±
0.3 V>
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L110
600 kHz <603 kHz>
TC102
1,400 kHz <1,404 kHz>
FM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L104
87.6 MHz
2.1
±
0.2 V
Confirmation
108 MHz
7.0
±
0.4 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L103
89.9 MHz
TC101
105.9 MHz
Adjustment Location: MAIN board (See page 14)
TUNER SECTION
0 dB=1
µ
V
[AM]
Setting:
Function
Function
: TUNER
Band switch : AM
[FM]
Setting:
Function
Function
: TUNER
Band switch : FM
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
+
–
–
level meter
set
32
Ω
HEADPHONE board
PHONES jack (JK401)
PHONES jack (JK401)
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
deviation by 400 Hz
signal
Output level: as low as possible
+
–
–
level meter
set
32
Ω
0.01
µ
F
MAIN board
FM ANT
FM ANT
HEADPHONE board
PHONES jack (JK401)
PHONES jack (JK401)
digital voltmeter
100 k
Ω
MAIN board
TP10 (FM VT)
TP11 (AM VT)
TP11 (AM VT)
14
HCD-EP30/EP40
Adjustment Location and Connecting Points
– MAIN BOARD (Component Side) –
L104 FM Frequency
Coverage Adjustment
Coverage Adjustment
T102
AM Frequency Coverage Adjustment
TC102
}
AM Tracking
L110
Adjustment
L103
FM Tracking Adjustment
TC101
}
– MAIN BOARD (Conductor Side) –
TP10
(FM VT)
TP11
(AM VT)
IC101
HCD-EP30/EP40
15
15
SECTION 6
DIAGRAMS
Note on Schematic Diagram:
• 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.
•
2
: nonflammable resistor.
•
C
: panel designation.
Note on Printed Wiring Board:
•
•
W
: indicates side identified with part number.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
•
A
: B+ Line.
•
H
: adjustment for repair.
• 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
: FM
f
: AM
E
: TAPE PLAY
a
: RECORD
J
: CD PLAY
• Abbreviation
AUS
: Australian model
CND : Canadian model
Note:
The components identi-
fied by mark
The components identi-
fied by mark
0
or dotted
line with mark
0
are criti-
cal for safety.
Replace only with part
number specified.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque
Les composants identifiés par
une marque
0
sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce por tant le numéro
spécifié.
Ne les remplacer que par une
pièce por tant le numéro
spécifié.
6-1.
NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
• Circuit Boards Location
MAIN board
HEADPHONE board
CASSETTE board
DISPLAY board
POWER board
HCD-EP30/EP40
16
16
IC B/D
IC B/D
IC B/D
2
MAIN BOARD
(2/2)
1
DSIPLAY
BOARD
A
1
4.5 (4.3)
L110, TC102
AM TRACKING
T102
AM FREQUENCY
COVERAGE
L103, TC101
FM TRACKING
L104
FM FREQUENCY
COVERAGE
0 (0.7)
5.4
(0.1)
(0.1)
0
1
(0)
(0)
5.2 (0)
5.2 (6.2)
5.2 (6.2)
0 (6.2)
1.3
1.3
1.2 (0.4)
4.5 (0.1)
4.5 (4.3)
4.5 (5.6)
4.5 (4.3)
0
4.5 (0.1)
0 (0.7)
0.2
(0.4)
5.2
(5.4)
1.3
1.3
5.2 (6.2)
5.2 (6.2)
2.8 (3.6)
0
5.2
(6.2)
5.2
(6.2)
1.3
1.3
0.3 (0.5)
0
0 (2.6)
2.6 (0)
5.1
0.9
0.9
2.4 (1.5)
2.6
2.5
0.1
0.1
5.4
0
0.1 (3.1)
0
9.3
9.2
8.5
0.7
0
0
0
5.4
5.6
5.4
4.8
2.4
0
0
4.5
2.4
*
2.2
2.2
1.6
4.5
2.4
FM
LEAD
ANTENNA
ANT1
FM ANT
75
Ω
COAXIAL
C157
0.1
C104
0.001
L103
FM RF
C105 0.001
L104 FM OSC
C111
0.001
TP10
(FM VT)
R112
3.3k
+
10V
0.001
0.01
1.2k
0.001
+
50V
0.0015
0.0015
3.9k
+
+
3.9k
50V
50V
6.8k
6.8k
0.0033 0.0033
+
+
+
50V
3.3k
50V
50V
Q103
STEREO/MONO
SWITCHING
Q102
FM/AM BAND
SELECT SWITCH
Q101
FM OSC BUFFER
IC101
FM/AM IF AMB
MIX, MPX, DET, OSC
IC102
FM/AM PLL
4.7k
100p
0.001
0.022
5.6k
0.01
2.2k
50V
5.6k
+
+
0.1
0.1
7.2MHz
+
MTZJ-5.1
+
10V
1
µ
H
Q116, 209, 210
TUNER B+ SWITCH
Q109, 605
B+ SWITCH
0.1
CN101
8P
0.047
AM FERRITE-ROD
ANTENNA
1
µ
H
AM OSC
0.047
+
50V
TP11
(AM VT)
0.022
0.022
10.7MHz
450kHz
+
50V
BUFFER
+
0.047
IC604
RDS DECODER
EP40
100
µ
H
0.1
+
0.1
4.7k
+
+
16V
2.2
50V
T2
T1
VSS2
VDD2
XI
XO
NC
RCLK
CMP
VSS3
VSS1
VDD1
MUX
VREF
RDAT
QUAL
MAIN BOARD
(1/2)
1N4148TP
1N4148TP
U
1
u
U
2
u
U
3
u
U
4
u
2SC1923
2.2P
10.7MHz
2SD1616-L
16V
RDSCL
RDSDA
PLLCE
PLLDI
PLLCL
STOUT
SIG
CT
RDSDA
PLLCE
PLLDI
PLLCL
STOUT
SIG
CT
470
16V
6-2.
SCHEMATIC DIAGRAM – MAIN Board (1/2) –
•
See page 23 for Waveforms.
•
See page 24 for IC Block Diagrams.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(
no mark : FM
(
) : AM
∗
: Impossible to measure
(Page 21)
(Page 17)
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