Sony CMT-EP404 / HCD-EP404 Service Manual ▷ View online
13
HCD-EP404
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.
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 (JK501)
PHONES jack (JK501)
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 (JK501)
PHONES jack (JK501)
digital voltmeter
100 k
Ω
MAIN board
TP (FM VT)
TP (AM VT)
TP (AM VT)
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
Confirmation
531 kHz
1.5
±
0.2 V
T101
1,602 kHz
7.3
±
0.3 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L110
603 kHz
TC102
1,404 kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L103
87.5 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
L102
89.9 MHz
TC101
105.9 MHz
Adjustment Location: MAIN board (See page 14)
14
HCD-EP404
Adjustment Location and Connecting Points
– MAIN BOARD (Component Side) –
L104
}
AM Tracking
TC102 Adjustment
TC102
}
FM Tracking
L102 Adjustment
L103 FM Frequency
Coverage Adjustment
Coverage Adjustment
T101 AM Frequency
Coverage Adjustment
Coverage Adjustment
IC101
– MAIN BOARD (Conductor Side) –
TP(AM VT)
TP
(FM VT)
15
15
HCD-EP404
Note on Schematic Diagram:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. p: pF.
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.)
• Indication of transistor
•
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.
no mark : FM
<
tion tolerances.
no mark : FM
<
> : CD (STOP)
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: AM
E
: PB (TAPE)
a
: REC (TAPE)
J
: CD PLAY
• WAVEFORMS
– MAIN Board –
– CASSETTE Board –
– DISPLAY Board –
1
IC102
ws
(XOUT)
3.4 Vp-p
139 ns
1 V/DIV, 40 ns/DIV
2
Q715 (Collector)
(RECORD (1SS) mode)
2 V/DIV, 4
µ
s/DIV
3
IC601
i;
(X2)
1 V/DIV, 100 ns/DIV
8.6 Vp-p
12.7
µ
s
5.1 Vp-p
238 ns
B
These are omitted.
C
E
SECTION 6
DIAGRAMS
6-1. Circuit Boards Location
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
MAIN board
LED board
HEADPHONE board
DISPLAY board
POWER board
16
16
HCD-EP404
6-2. Block Diagrams
TUNER/TAPE DECK Section
: FM
: AM
• Signal Path
• R-CH is omitted due to same as L-CH.
: PB(TAPE)
: REC(TAPE)
9
13
12
11
1
3
10
5
15
7
7
16
18
19
20
15
8
11
12
6
4
5
3
1
22
Q103
FM OSC
BUFFER
BUFFER
Q102
BAND
SWITCH
Q101
AMP
BPF
AMRF_IN
AM_OSC
24 FMRF_IN
22 FM_RF
FM_OSC
20
FM_IF
AM
OSC_OUT
FM
ANT
L104
AM ANT
D105
T101
AM OSC
L102
FM RF
D103
D104
L103
FM OSC
F102
10.7MHz
T102
X101
10.7MHz
PD
AIN
AOUT
FMIN
AMIN
BO1
IO1
IFIN
DO
DI
CL
CE
IC102
FM/AM PLL
X102
7.2MHz
XIN
XOUT
AM_MIX
FM_MIX
FM_DET
AGC
AM/FM
IF_OUT
AM_IF
16
17
L_OUT
R_OUT
IC101
AM/FM IF AMP,
MIX, MPX, DET, OSC
72 20 76 6
DA
TAIN
DA-IN
PLL-CE
ST
A
TION
STEREO
PLLENA
ST
A
TION
STEREO
DA-IN
STEREO
DI
PLL-CE
CL
STATION
A
AMP
SECTION
SECTION
AMP
SECTION
SECTION
B
AMP
SECTION
SECTION
C
AMP
SECTION
SECTION
D
PANEL
SECTION
SECTION
E
IC301 (1/3)
SYSTEM CONTROLLER
R-CH
TUNER
L-CH
TC102
TC101
FM FREQUENCY
COVERAGE
AM FREQUENCY
COVERAGE
AM TRACKING
FM TRACKING
F103
450kHz
MOTOR-ON
IC701
REC/PB SWITCH
IC702
ALC,
REC/PB AMP
R-CH
Q718
R-CH
L-CH
(RECORD/PLAYBACK)
R-CH
R-CH
95
REC-EN
16
6
7
3
4
4
8
7
9
(PROTECT (FWD) DETECT)
(HALF SWITCH)
Q705
REC/PB
SWITCH
Q701
REC/PB
SWITCH
Q703
AMP GAIN
CONTROL
Q719
ALC
CONTROL
ALC
BIAS
TRAP
Q720,721
CAPSTAN/REEL
MOTOR DRIVE
SENSORA
90
BLINK
70
AMS
68
24/12
66
T701
BIAS OSC
9V
Q716,717
REC BIAS
REC BIAS
SWITCH
M
(CAPSTAN/REEL)
SOL
93
Q722,723
TRIGGER
PLUNGER DRIVE
(TRIGGER PLUNGER)
R-CH
R-CH
R-CH
R-CH
R-CH
R-CH
(MODE SWITCH)
D305
D308
D703
D701
D702
TL-CH
TR-CH
RL-CH
RR-CH
(ERASE)
SWITCHING
R-CH
ISS SWITCHING
Q724
TAPE PLAY DETECT
SENSOR
Q711
REC AMP
Q713
PB AMP
Q707
MUTING
Q715
BIAS OSC
ALC
IN
OUT
ALC
CNTRL
CNTRL
IN
NF
2
DI
CL
STA_B+
2SS
1SS
SW601
BEAT CUT
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