Sony PMC-20 Service manual

digital voltmeter
100 k
TP (VT)
)
PMC-20
SERVICE MANUAL
Ver 1.0 2000. 02
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). ( ) : Refer to page of this manual (PMC-20) (( )): Refer to page of PMC-107
1. ELECTRICAL ADJUSTMENTS ((Page 14))
TUNER SECTION 0 dB = 1 µV
• FM Section
Setting:
BAND switch: FM
FM RF signal generator
TP (FM ANT)
0.01 µF set
22.5 kHz frequency deviation by 400 Hz signal output level : as low as possible
• Connecting Level Meter (FM and AM)
set
phones jack
• Connecting Digital Voltmeter (FM and AM)
US Model
level meter (range: 0.5–5 V ac
• AM Section
Setting:
BAND switch: AM
AM RF signal generator
30% amplitude modulation by 400 Hz signal
Put the lead-wire antenna close to the supplied MW/LW loop antenna.
• Repeat the procedures in each adjustment several times, and the frequency coverage and tracking adjustments should be finally done by the trimmer capacitors.
PERSONAL COMPONENT SYSTEM
– 1 –
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
– MAIM BOARD (COMPONENT SIDE) –
TP (VT)
TU1
R31
AM
TRACKING
ADJUSTMENT
AM
FREQUENCY
COVERAGE
ADJUSTMENT
TP
(FM ANT)
L9
CT4
L2
CT2
– 2 –
2. DIAGRAMS
2-1. BLOCK DIAGRAM — MAIN SECTION — ((Page 25))
PMC-20
ANTENNA
AM
ANTENNA
FM
04
CNP1 LOOP
FM
LEAD
HRP301
RECORD/PLAYBACK
L-CH
R-CH
CAPSTAN /REEL
S301
(MD POWER)
S302
(MD PLAY)
D302
PON+B
AM
HEAD
LPF Q11
REG Q12
M301
MOTOR
M
R-CH
VREF
CT4, L9
AM
TRACKING
CT4
3 4
8
((Page 24))
CD SECTION
T301
REC
BIAS
VREF
Q301, 316
+8V
FREQUENCY
COVERAGE
D5
L9
(AM ANT)
OSCOUT VT
RFIN
RFPUT
VDD
TUNER PACK
TU1
SW301-2
PB REC
62
T-PLAY
CT2, L2
AM
CT2
CD L-CH
1
VREF
SW301-1
PB REC
BIAS OSC
55
23–20
+8V
1 5
Q303
REC
COM0
LCD801
+5V
REC
REC/PB
CONTROL
Q302, 315
COM3
19–1, 80–78 30•31 35–38
L2
AMP
Q1
PB
SEG0
SEG21
70 69 68 57
4 5 6 7
PD1
21
AM RF
24 3 7
FM RF
1
CDIN1
22
PBIN1
5
REC1
4
P/R
21
6
VREFVREF
R-CE
R-CLK
R-DATA
R-COUNT
CE
CK
DA
CD
AM IN
FM IN
17 16 1 2 8
FM
MIX
FM
OSC
OSC
2123
AM
OSC
AM
MIX
PRE-AMP
IC301
ALC AMP
RAIN1
24
TEX
TX
X802
32.768KHz
PLL IC2
XOUT
X1
75KHz
FM/AM FRONT-END, IF DET,
FM STEREO DEMODULATOR
OUT1
20 31 24 2
TU 5V
CONTROL
CLOCK
SHIFT
Q804
XIN
IC1 CFT1
Q20
SEL
17
TAPE
15
52
TAPE
72 74 76 32 58 6167
SYSTEM CONTROL/LCD DRIVE
EXTAL
XTAL
X801
4.19MHz
CLOCK
SHIFT
Q803
MO/ST
9 14
Q10
14 181922
IF
MO/ST
BUFFER
6
CF2CF1
5V REG
Q2
IC801 (2/2)
SHIFT-CLK
IF IN
AM
DET
FM
DET
AUDIO 8V
RESET
IC804
COM 5V
FM
15 10
BAND
QUAD
VOLUME/SOUND CONTROL
IC302
IN2
SURROUND TONE VOL
CONTROL
PORT2
PORT1CKDATA
13 12 20 19 18
RST
R-ST
R-MUTE
Q15
Q8
ST-IND
AF
BUFFER
17 16
OUT2
VC
23
Q304
BC
LATCH
21
MUTE CONTROL Q305, 317
49 48 50 47
V-CE
V-CLK
V-DATA
KEY1
KEY4
WP
Q805
D806, 807
SW801
|
SW819
H. FREQ.
CUT
Q7
IF CUT
CF4CF3
AUDIO 8V
FM
MPX
13
VCO
H. FREQ.
POWER AMP
POWER AMP
CONTROL Q313, 314
A-MUTE
MUTE
189
IF CUT
Q9
IC303
STBY
5
60
RECEIVER
R L
PA-CON
28
SIRCS
IC803
12 11
RMC
R-CH
R-CH
12
RADIO
53
CD
54
REG-CON
REG-CHK
42
51
COM 5V
VDD 5V
+5V
TU 5V
CD 5V
+8V
D802
D805
D804
J302
PHONES
SP301
SPEAKER
(L-CH)
TUNER 5V
SWITCH
Q306
CD 5V
SWITCH
Q307
LED/LAMP
B+ SWITCH
DRIVE
Q806
Q801, 802
D801
OPERATION
VCC
5V REG
Q308
8V REG
Q309, 310
POWER ON
SWITCH
Q311, 312
+5V REG
IC802
RECT
D901–904
D905
T901
POWER
TRANSFORMER
AC IN
Signal path
: FM
R-CH
: AM : PLAY
Q13
: REC : CD
R-ch : same as L-ch.
– 4 –– 3 –
PMC-20
2-2. PRINTED WIRING BOARD — MAIN BOARD — ((Page 32))
Comon Note on Schematic Diagram:
• 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 and 1/ specified.
f
: internal component.
4
W or less unless otherwise
2 : nonflammable resistor.
5 : fusible resistor.
C : panel designation.
Note: The components identified by mark 0 or dotted line
with mark 0 are critical for safety. Replace only with part number specified.
U : B+ Line.
• Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM ( ) : AM / TAPE PB < > : TAPE REC [ ] : CD
• Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal produc­tion 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.
• Semiconductor Location
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
Ref. No. Location 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 IC1 C-5 IC2 D-8 IC301 H-7 IC302 F-8 IC303 G-5
Q309 I-4
Q310 J-5
Q311 I-5
Q312 I-5
Q313 E-4
Q314 F-4 Q1 B-5 Q2 C-8 Q7 D-5
Q315 H-9
Q316 I-9
Q317 E-8 Q8 D-5
A
B
C
D
E
F
G
H
J
1
SP301
SPEAKER
L-CCH
SP302
SPEAKER
R-CCH
I
234567891011
MAIN BOARD
R9
C75
C73
L6
CT4
C7
R10
R54
L2
C11
C76
JW92
C21
CF4 C19
R15
C20
R109
R332
C118
C218
C313
C119
R217
R110
C116
C320
C117
C115
C312
R341
C112
C114
R345
C360
Q309
JW43
L9
C16 C18
R116
C310
C41
R43 JW60
L302
JW51
R340
S
R36
C4
JW108
C213
C216
Q1 R5
R1
C6
JW65
C13
JW63
Q7
Q8
IC303
Q308
C8
R209
C342
JW77
C17
JW83 JW81
R210
R333
L12
IC1
JW26
JW4
JW52
R215
JW6
JW3
C214
C318
C61
124
1213
C22 C23
C212
R216
R334
Q310
C5 C31
R40
R38
L7 C14 L1 C64
C2
Q9
D8
JW101
JW59 JW58 JW57
JW45
R342
C215
C217
(CHASSIS)
JW7
Q311
D304
R39
R13
C15
C26
CF2
C25
CF3
C333
C319
Q312
Q20
C24
JW50
JW35
JW104
JW66
C42
C43
R46
R14
R337
CNP305
1
3
JW10 JW11
JW9
JW17
R44
R41
R35
R108
C65
BLK BLK WHT
R335 C317
CF1
C59
C58
CFT1
L13
R42
JW44
JW105
R47 R48
R45
JW73
C44
Q14
C45
JW30 JW34
JW62
JW8
JW47
JW89
JW96
JW39
JW42
JW2
JW90
Q15
JW78
JW41
JW79
JW74
R53
C9
Q13
JW28
JW103
C309
R211
Q306
JW38
C341
R302
JW88
C203
JW19
POWER BOARD CNP901
R16
C211
R208
C311
C204
R203
D4
R25
JW67
JW53
JW102
JW87
R37
JW12
C338
C336
C339
D303
C308
BLK
BLK
CNP304
17
BLK
R308
JW85
JW1
C205
R212
JW36
13 24
R204
C202
R202
R201
C201
C340
CNP301 CNP302
1414
BLU
HRP301
RECORD/PLAYBACK
HEAD
JW98
R107
Q307
R213
C347
RED
Q2
R33
JW97
C107
R207
C207
BLK
JW100
JW61
R205
R105
YEL
WHT
C46
L5
C34
C56
C29
R34
C306
C109
C108
32 17 1
C208
R309
WHT
JW27
JW64
C206
R214
IC301
C102
R101
BLK
JW76
C3
L3
C33
C30
R28
JW93
C111
C110
IC302
JW106
C209
JW31
JW82
WHT
REC SW CNP801
C1
R22 JW109
R324
JW107
C210
JW5
R114
C106
112
R104
C101
C103
BLK
BLK
BOARD
C12
C307
JW33
C326
Q317
16
R102
JW54
R329
C316
C315
R112
R113
C302
JW18
Q301
IC2
C327
R111
C105
R301
C334
JW80
R12
C35
R336
C330
JW40
R103
1458
C37
JW49
JW94 JW32
TU1
JW99
JW95
R27
C39
3217
116
C51
Q305
R323 Q304
R338
C331
JW25 JW21
C303
Q315
Q302
C104
C345
JW22
C332
C335
Q316
(MD POWER)
(MD PLAY)
C36
R29
C52
C323
R325
C325
S301
S302
S
R339
C348 JW48
JW24
T301
JW20
C53
C27
R17
R322
R321
JW29
R303
R304
C301
R3
C38 R30
Q11
C28
R18
R19
C321
JW70
JW15 JW13
CNP303
2
22
23
JW37
Q303
C337
R26
X1
R20
1
D308
C304
R306
L8
C40
R32
S
JW84
R305
R343
Q12
C74
JW55
JW75
JW56
JW72
R327
JW46 JW69
C328
JW16
JW71
JW86
D305
R307
C305
CNP306
BRN
1
BRN BLU
BLU RED BLK
6
1-670-854-
BLU BLU BRN BRN
R31
JW68
R326
C324
JW23
((Page 40))
C346
11
(11)
(CAPSTAN/REEL)
RED BLK
3
CONTROL
BOARD
CNP801
M301
CD BOARD
((Page 28))
L
L
R
R
CNP704
H.P BOARD
CNP704
((Page 33))
AM
LOOP
ANTENNA
CNP1
AM
1
J301
RL
04
FM
LEAD
ANTENNA
CNP1
WHT
BLK BLK BLK BLK
D2
D5
D302
C343
C329
R330
D301
R
L
CNP307
FM
D7
5
1
D307
C10
Q313
Q314
C219
C314
D6
CT2
C113
R117
D306
D1
C72
Q10
C344
R115
((Page 34)) ((Page 34))
– 5 – – 6 –
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