Sony CMT-EP50LIV / HCD-EP50LIV Service Manual ▷ View online
13
HCD-EP50LIV
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
450 kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
T8
530 kHz
1.3
±
0.1 V
Confirmation
1,710 kHz
7.8
±
0.5 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
T6
603 kHz
TC1
1,404 kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L901
87.5 MHz
2.4
±
0.1 V
Confirmation
108 MHz
6.8
±
0.5 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L902
90.1 MHz
TC901
106.1 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
MAIN board
SPEAKER terminal (CN17)
SPEAKER terminal (CN17)
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
MAIN board
SPEAKER terminal (CN17)
SPEAKER terminal (CN17)
digital voltmeter
100 k
Ω
MAIN board
TP (FM VT)
TP (AM VT)
TP (AM VT)
14
HCD-EP50LIV
Adjustment Location and Connecting Points
– MAIN BOARD (Component Side) –
T8
AM Frequency
Coverage Adjustment
T1
AM IF Adjustment
AM Tracking Adjustment
{
TC1
T6
T6
– MAIN BOARD (Conductor Side) –
TP
(FM VT)
TP
(AM VT)
U1
U2
L902
}
FM Tracking Adjustment
TC901
L901 FM Frequency Coverage Adjustment
HCD-EP50LIV
15
15
AM
RF AMP
AM
OSC
AM
MIX
L. P. F
FM/AM PLL
U2
AM/FM
IF BUFFER
DECODER
• SIGNAL PATH
: FM
: AM
X2
7.2MHz
AMIN
IFIN
IF-BUFF
MUTE
AM/FM
VCO-STOP
IO1
AOUT
AIN
FMIN
20
1
14
13
18
SWALLOW
COUNTER
UNIVERSAL
COUNTER
CCB
INTERFACE
REFERENCE
DIVIDER
UNLOCK
DETECT
12 BIT
PROGRAMMABLE
DIVIDER
PHASE
DETECTOR/
CHARGE PUMP
SHIFT REGISTER & LATCH
1/2
DI
CL
CE
DO
DA IN
STATION
STEREO
FM ON/OFF
ST/BEAT
TU-L
R-CH
R-CH
OUT L
AMP-
IN L
IN L
AMP-
OUT L
OUT R
TU-R
CLOCK
PLL CE
DA OUT
PD
XIN
XOUT
3
4
2
5
11
BO1
6
10
17
16
• R-ch is omitted due to same as L-ch.
CN12
CN13
T6
AM RF
T8
AM OSC
D5
CF3
10.7MHz
AM-RF
-IN
-IN
AM-IF
FM-IN
FM-DET
OUT
MPX-IN
AM-DET OUT
AM-MIX
AM-OSC
OSC.BUFF
FM-SD.ADJ
1
23
2
30
4
27
29
TC1
DET
AM IF
AGC
CF4
450kHz
FM
DET
FM IF
24
22
20
21
19
17
MUTING
13
15
14
TUNED
6
STEREO
7
FM/AM IF AMP,
AM RF AMP/MIX/OSC,
FM/AM DET, MPX
U1
E
(Page 17)
C
(Page 16)
D
(Page 18)
B
(Page 17)
FM ANT
75
Ω
COAXIAL
AM ANT
AM FREQUENCY
COVERAGE
T8
AM TRACKING
T6, TC1
AM IF
T1
FM DET
9
T5
FM DET
L. P. F.
T4
L. P. F.
T2
FM/AM BAND
SELECT SWITCH
Q3
STEREO/MONO
SWITCHING
Q17
1
FM RF
AMP
PHASE
DETECTOR/
CHARGE PUMP
FM RF
IN
MIX
OUT
3
13
FM
OSC
FM OSC
BUFFER
BUFFER
Q901
15
FM RF
OUT
FM MIX
FM OSC
D905
D906
TC901
B. P. F.
BPF901
T901
FM IFT
L901
FM OSC
L902
FM RF
FM FREQUENCY
COVERAGE
L901
FM TRACKING
L902, TC901
FM RF AMP/MIX/OSC
IC901
SECTION 6
DIAGRAMS
6-1.
BLOCK DIAGRAM – TUNER Section –
HCD-EP50LIV
16
16
: RECORD
: TAPE PLAY
Q5
REC/PB SWITCHING
U12
ALC,
REC/PB AMP
U13
R-CH
Q36
R-CH
L-CH
HPRE101 (1/2)
(RECORD/PLAYBACK)
R-CH
R-CH
14
Q1
4
STR
1
2
6
7
3
4
4
8
7
9
(PROTECT (FWD) DETECT)
(PROTECT (REV) DETECT)
(TAPE DETECT)
(CrO
2
DETECT)
REC/PB
SWITCH
Q34
REC/PB
SWITCH
Q30
AMP GAIN
CONTROL
Q28
ALC
CONTROL
Q8
ALC
BIAS
TRAP
CAPSTAN/REEL
MOTOR DRIVE
Q37, 39
SENSORA
18
AMS
24
SEL14
98
SEL15
SEL12
96
SEL10
94
BIAS OSC
L5
9V
+5V
REC BIAS
SWITCH
Q32, 33
M
(CAPSTAN/REEL)
Q7
12
TRIGGER
PLUNGER DRIVE
Q38, 40
(TRIGGER PLUNGER)
Q3
6
LED
DRIVE
Q305
D313
SW318
(MONO STEREO)
CAPSTAN/REEL MOTOR CONTROL,
TRIGGER PLUNGER CONTROL,
REC BIAS CONTROL
U15
SYSTEM CONTROLLER
IC301 (1/3)
R-CH
R-CH
R-CH
R-CH
R-CH
R-CH
(HEAD POSITION DETECT)
STROBE
44
DATA
2
CLK
3
Q8 11
Q6
CD-EN
TU-EN
ST/BEAT
DA IN
CLOCK
13
D305
D306
D308
D29
D50
D4
D32
Q4
7
LED
DRIVE
Q304
D312
I
(Page 18)
C
(Page 15)
H
(Page 17)
TL-CH
TR-CH
RL-CH
RR-CH
F
(Page 17)
TROUT
6
V.N
1
AMS
U14
HPRE101 (2/2)
(ERASE)
SWITCHING
R-CH
ISS SWITCHING
Q41
z
TIMER
ISS
2 1
STEREO MONO
BUFFER
Q14
TAPE PLAY/REC DETECT
SENSOR
REC AMP
Q25
MUTING
Q26
TAPE TYPE
SELECT SWITCH
Q45
G
(Page 18)
99
BIAS OSC
Q31
ALC
IN1
OUT1
ALC
CONST
IN1
NF1
• SIGNAL PATH
• R-ch is omitted due to same as L-ch.
6-2.
BLOCK DIAGRAM – TAPE DECK Section –
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