Sony PMC-20 Service Manual ▷ View online
– 1 –
digital
voltmeter
voltmeter
100 k
Ω
TP (VT)
phones jack
set
32
Ω
level meter
(range: 0.5–5 V ac)
(range: 0.5–5 V ac)
TP (FM ANT)
FM RF signal
generator
generator
0.01
µ
F
set
PMC-20
US Model
SERVICE MANUAL
Model PMC-20 is almost same as PMC-107 US model.
This manual contains only the points which differ from PMC-107 US model.
For the information not contained in this manual, please refer to PMC-107 service manual (9-924-914-S).
(
This manual contains only the points which differ from PMC-107 US model.
For the information not contained in this manual, please refer to PMC-107 service manual (9-924-914-S).
(
) : Refer to page of this manual (PMC-20)
((
)) : Refer to page of PMC-107
PERSONAL COMPONENT SYSTEM
1. ELECTRICAL ADJUSTMENTS ((Page 14))
TUNER SECTION 0 dB = 1 µV
• FM Section
Setting:
BAND switch: FM
BAND switch: FM
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
• AM Section
Setting:
BAND switch: AM
BAND switch: AM
30% amplitude
modulation by
400 Hz signal
modulation by
400 Hz signal
• Connecting Level Meter (FM and AM)
• Connecting Digital Voltmeter (FM and AM)
• 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.
Put the lead-wire
antenna close to
the supplied MW/LW
loop antenna.
antenna close to
the supplied MW/LW
loop antenna.
AM RF signal
generator
generator
Ver 1.0 2000. 02
– 2 –
FM FREQUENCY COVERAGE
CHECK
Frequency Display
87.6 MHz
108 MHz
Reading on Digital voltmeter
1.55 ± 0.2 V
4.0 ± 0.2V
Adjustment Part
<confirmation> <confirmation>
FM TRACKING CHECK
Adjust for a maximum reading on level meter.
<confirmation>
<confirmation>
87.6 MHz
108 MHz
AM FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display
530 kHz
1,710 kHz
Reading on Digital voltmeter
0.75 ± 0.05 V
5.4 ± 0.2V
Adjustment Part
L2
CT2
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L9
CT4
620 kHz
1,400 kHz
Adjustment Location: main board
AM
FREQUENCY
COVERAGE
ADJUSTMENT
TP (VT)
CT2
L2
AM
TRACKING
ADJUSTMENT
CT4
L9
TP
(FM ANT)
R31
TU1
– MAIM BOARD (COMPONENT SIDE) –
– 4 –
– 3 –
PMC-20
2. DIAGRAMS
2-1. BLOCK DIAGRAM — MAIN SECTION — ((Page 25))
M
5
4
21
6
24
55
62
70 69 68 57
4
5
6
7
72
74
76
32
58
61
67
23–20
15
52
17
13
12
20 19 18
49 48 50
47
53
21
20
31
24
2
5
12
23
22
PBIN1
REC1
P/R
VREF
VREF
RAIN1
TAPE
CDIN1
CD L-CH
ALC AMP
SW301-1
PB
REC
SW301-2
PB
REC
CONTROL
SEL
OUT1
PRE-AMP
IC301
R-CH
R-CH
L-CH
HRP301
RECORD/PLAYBACK
HEAD
1
CD SECTION
S302
(MD PLAY)
S301
(MD POWER)
T-PLAY
COM0
REC
COM3
19–1, 80–78
30•31
35–38
SEG0
SEG21
R-CE
R-CLK
R-DATA
R-COUNT
LCD801
SURROUND
TONE
VOL
CONTROL
PORT2
PORT1
CK
DATA
BC
LATCH
VOLUME/SOUND CONTROL
IC302
POWER AMP
IC303
Q304
SP301
SPEAKER
(L-CH)
R-CH
R-CH
J302
PHONES
V-CE
A-MUTE
60
PA-CON
V-DATA
V-CLK
TAPE
X802
32.768KHz
X801
4.19MHz
CLOCK
SHIFT
Q803
CLOCK
SHIFT
Q804
RESET
IC804
COM 5V
RST
R-ST
R-MUTE
KEY1
KEY4
WP
28
SIRCS
RECEIVER
IC803
RMC
51
REG-CON
42
REG-CHK
SHIFT-CLK
EXTAL
XTAL
TEX
TX
RADIO
54
CD
TUNER 5V
SWITCH
Q306
T901
POWER
TRANSFORMER
CE
CK
DA
CD
21
17 16
1
2
8
15
10
14
18
19
22
21
23
24
3
7
17
16
12
11
18
9
1
PD1
AM IN
FM IN
XOUT
XIN
IF IN
MO/ST
FM
X1
75KHz
9
14
AM
OSC
FM
OSC
AM
MIX
FM
MIX
AM RF
FM
RF
RF
IF
BUFFER
MO/ST
BAND
ST-IND
AM
DET
6
FM
DET
AF
BUFFER
H. FREQ.
CUT
Q7
H. FREQ.
IF CUT
Q9
5V REG
Q2
FM
MPX
MUTE
R-CH
Q13
QUAD
VCO
13
IF CUT
R
L
CF4
CF3
CF2
CF1
CFT1
Q20
LPF
Q11
REG
Q12
L9
(AM ANT)
AMP
Q1
PON+B
+8V
04
D302
D5
CT4, L9
AM
TRACKING
L2
CT2
CT4
FM/AM FRONT-END, IF DET,
FM STEREO DEMODULATOR
IC1
SYSTEM CONTROL/LCD DRIVE
IC801 (2/2)
PLL
IC2
Signal path
R-ch : same as L-ch.
: FM
: AM
: PLAY
: REC
: CD
Q15
Q8
Q10
OSC
FM
LEAD
ANTENNA
AM
FM
CNP1
AM
LOOP
ANTENNA
Q805
D806, 807
SW801
|
SW819
TU 5V
CD 5V
SWITCH
Q307
5V REG
Q308
8V REG
Q309, 310
POWER ON
SWITCH
Q311, 312
CD 5V
+8V
VCC
+5V
LED/LAMP
DRIVE
Q806
D801
OPERATION
B+ SWITCH
Q801, 802
+5V REG
IC802
RECT
D901–904
D905
COM 5V
VDD 5V
D804
D805
D802
AC IN
MUTE
CONTROL
Q305, 317
POWER AMP
CONTROL
Q313, 314
STBY
OUT2
VC
IN2
+8V
M301
CAPSTAN /REEL
MOTOR
TU 5V
+5V
VREF
VREF
VREF
BIAS
OSC
Q303
Q301, 316
REC/PB
CONTROL
Q302, 315
REC
PB
T301
REC
BIAS
8
1
5
3
4
AUDIO 8V
AUDIO 8V
OSCOUT
VT
RFPUT
RFIN
VDD
TUNER PACK
TU1
CT2, L2
AM
FREQUENCY
COVERAGE
((Page 24))
– 5 –
– 6 –
2-2. PRINTED WIRING BOARD — MAIN BOARD — ((Page 32))
PMC-20
Comon Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
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.
•
f
: internal component.
•
2
: nonflammable resistor.
•
5
: fusible resistor.
•
C
: panel designation.
•
U
: B+ Line.
• Voltage is dc with respect to ground under no-signal
(detuned) condition.
no mark : FM
(
no mark : FM
(
) : AM / TAPE PB
<
> : TAPE REC
[
] : CD
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Signal path.
F
: FM
f
: AM
E
: PB
a
: REC
J
: CD
Comon Note on Printed Wiring Boards:
•
X
: parts extracted from the component side.
•
f
: internal component.
•
b
: Pattern from the side which enables seeing.
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
Q9
E-5
Q10
D-4
Q11
C-9
Q12
C-10
Q13
D-6
Q14
D-6
Q15
C-6
Q20
B-6
Q301
J-8
Q302
I-9
Q303
I-9
Q304
E-9
Q305
E-9
Q306
G-6
Q307
F-7
Q308
I-5
Q309
I-4
Q310
J-5
Q311
I-5
Q312
I-5
Q313
E-4
Q314
F-4
Q315
H-9
Q316
I-9
Q317
E-8
Ref. No.
Location
D1
B-4
D2
B-3
D4
C-7
D5
C-4
D6
B-4
D7
B-3
D8
E-5
D301
F-3
D302
E-4
D303
F-7
D304
I-5
D305
H-10
D306
I-4
D307
J-3
D308
H-9
IC1
C-5
IC2
D-8
IC301
H-7
IC302
F-8
IC303
G-5
Q1
B-5
Q2
C-8
Q7
D-5
Q8
D-5
• Semiconductor Location
Ref. No.
Location
1
A
B
C
D
E
F
G
H
I
J
2
3
4
5
6
7
8
9
10
11
Q305
Q304
R324
R329
Q317
IC302
CONTROL
BOARD
CNP801
3
REC SW
BOARD
CNP801
S301
(MD POWER)
S302
(MD PLAY)
RED
BLK
BLU
BLU
BLU
BRN
BRN
BRN
M301
(CAPSTAN/REEL)
HRP301
RECORD/PLAYBACK
HEAD
POWER
BOARD
CNP901
CD BOARD
CNP704
SP301
SPEAKER
L-CCH
SP302
SPEAKER
R-CCH
1
H.P BOARD
CNP704
FM
AM
CNP1
FM
LEAD
ANTENNA
AM
LOOP
ANTENNA
MAIN BOARD
D1
D2
D7
R54
C1
1
C17
R15
C25
C65
D6
C10
CT2
R10
L2
C76
C18
C16
C21
C22
C23
CF4
C19
C20
C344
C216
C116
C114
C320
R115
R332
C219
J301
D301
R1
17
C1
19
C1
18
R345
R1
16
L302
R109
C113
R330
Q313
Q314
D302
C343
C329
Q10
Q7
Q8
Q9
Q14
Q13
D8
R35
R46
C43
C42
R47
R48
JW73
JW30
JW34
JW34
JW62
JW8
JW78
JW47
JW89
JW96
JW50
JW6
JW35
JW2
JW77
JW51
JW88
JW19
JW42
JW41
JW39
JW38
Q306
Q307
R308
R342
R21
1
C208
C209
C109
C
111
C1
10
C326
C327
R107
C339
JW84
JW55
JW68
R336
R323
R207
R338
C331
C330
R322
C108
C210
D303
R216
R215
C342
IC303
JW3
R217
C1
17
C1
15
C218
C360
R340
C312
C310
Q31
1
Q312
R333
R334
R341
C313
D304
C217
C319
C318
C215
C333
C214
JW101
JW58
JW59
JW45
JW57
C44
C45
C336
C338
C7
C13
D5
CNP1
L9
S
C41
JW43
C6
CT4
IC1
C72
C73
R9
L6
Q1
R5
L12
C5
C31
L7
C14
C14
R1
C8
C4
R36
R42
C2
Q15
L13
C24
R43
L1
C64
C64
C61
JW92
JW26
JW4
JW83
JW81
JW108
JW63
R209
R210
C212
C1
12
R1
10
C213
R14
JW53
JW102
JW67
JW98
C306
R33
R28
R22
R30
R3
R26
L8
C38
C36
C40
C30
C33
C51
C53
IC2
Q11
Q12
JW80
JW99
JW95
X1
C52
C28
C27
R17
R18
R19
R20
R29
R32
R31
C74
C56
C34
L3
Q2
C46
C3
S
S
C37
C39
C9
JW79
JW74
JW44
JW105
C58
CFT1
R44
Q20
CF1
C59
R41
R39
R40
R38
R13
C15
C26
CF2
CF3
R16
R53
R25
D4
L5
C1
C12
R12
C35
R27
C29
R34
JW87
JW103
JW28
JW12
R45
R37
R337
R108
JW52
JW60
JW65
CNP305
(CHASSIS)
1
3
BLK
BLK
WHT
WHT
R335
R204
C204
R202
R105
R101
C201
C101
C103
C334
JW22
JW54
JW18
C335
C332
R102
R103
C346
C325
C303
C106
C206
C205
C341
C302
R325
R1
12
R1
13
R1
14
R212
R213
R214
R301
R321
R327
R326
JW23
JW86
JW16
JW71
JW37
JW40
JW31
JW5
JW100
JW1
JW61
JW64
JW27
JW29
JW49
C324
C328
R306
R305
R343
C104
R205
BLU
RED
YEL
WHT
BLK
WHT
BLK
BLK
R203
C203
C202
C347
R201
C340
CNP301
CNP302
C102
C311
C317
JW10
JW7
JW90
JW9
JW17
JW11
JW82
T301
C301
C304
C337
1-670-854-
C305
R307
R104
R303
C105
R111
R302
C308
R309
R304
D308
D305
JW20
JW24
11
(11)
JW76
JW36
IC301
1
4
1
4
Q301
Q316
Q315
JW94
JW32
Q302
Q303
C345
BRN
BRN
BLU
BLU
BLU
RED
BLK
RED
BLK
1
6
CNP306
1
12
13
24
BLK
BLK
BLK
BLK
WHT
JW85
C207
C316
CNP303
C315
JW25
JW46
JW48
JW15
JW107
JW106
JW70
JW97
JW33
C107
JW72
JW75
JW56
JW13
C348
R339
C323
C321
JW69
JW21
R208
C211
C309
1
7
CNP304
1
1
22
23
16
32
17
2
JW93
C307
JW109
32
17
1
16
TU1
1
4
5
8
JW104
JW66
1
24
12
13
R
R
L
L
CNP307
5
1
D306
C314
D307
04
Q310
Q308
Q309
WHT
BLK
BLK
BLK
BLK
BLK
BLK
BLK
R
R
L
L
C75
((Page 28))
((Page 33))
((Page 34))
((Page 34))
((Page 40))
