SL
V
-SE850/SF900/SF950/SF990
4-5
4-6
REC/PB HEAD AMP
MA-388 (1/8)
For sc
hematic diagram
•
Ref
er to page 4-21 f
or pr
inted wir
ing board.
•
Ref
er to page 4-3 f
or w
a
v
e
fo
rm
s
.
4-2.
PRINTED
WIRING BO
ARDS AND SCHEMA
TIC DIA
GRAMS
2200
R272
RFSWP
0.01u
B
C271
PBRF
0.01u
B
C282
100uH
L270
0
R273
470
R270
RECH
0.01u
B
C281
5P
CN262
1
PB RF
2
RF SWP
3
GND
4C
T
L
5
A
V ADJ
XX
C270
5600
R274
XX
C273
RECC
0.01u
B
C283
XX
C274
RECYRF
10k
R276
0.1u
B
C276
CSYNC
47k
R275
470
R271
TRICKH
ANGND
22k
R277
0.01u
B
C275
LP
22k
R278
0.1u
B
C279
RFENV
SW5V
22k
R279
XX
C277
10V
100u
C280
COMPOUT
0.01u
B
C285
PDTC144EK-115
Q270
IC260
LA70016
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
HASW
0.1u
B
C272
RECCURADJ
0.22u
B
C284
CTLCHK
0
R280
JL260
JL261
JL263
JL262
JL265
JL264
JL266
JL267
JL268
JL269
JL270
JL271
0.022u
C278
B
2PD601AR-115
Q271
2700
R283
XX
R284
1k
R285
XX
C286
XX
C287
100p
CH
C288
JL272
AUDIOREC
AUDIOCH2
AUDIOCH1
330
R286
4.7uH
L271
27p
C289
11P
CN260
1
2
3
4
5
6
7
8
9
10
11
JL273
A
V
ADJUST
JL274
JL275
JL276
1
A
AUDIO REC
SP CH1.2 S
LP CH2 F
SP CH2 F
FE
SP CH1 F
LP CH1.2 S
LP CH2
AUDIO CH1
SP CH2
GND(SW)
AUDIO CH2
AUDIO CH2 L
SP CH1
LP CH1 F
AUDIO CH1 H
LP CH1
EP OFF
CURRENT
BIAS
PB OFF
1k
SP
DET
ENVELOPE
ALL 5V
SP OFF
VCC
CONT
REC
L
SP OFF
10k
HA
10k
BIAS
AMP
TO HA
PB ON
H.SYNC
REC OFF
COMP
AMP
SW30
AMP
DET
H.SYNC
REC
H
AMP
AGC
ATT
AMP
EP OFF
VCC
EP
CURRENT
SW30
HA
AGC
AMP
VCC
VCC
PB OFF
1
6
4
3
8
5
11
9
7
10
2
DRUM VIDEO HEAD
BUFFER
TO(2/8)
PB
Y
XX MARK:NO MOUNT
SIGNAL P
A
T
H
CHROMA
IC260
AUDIO
B+
Y/CHROMA
16
NO MARK:REC/PB MODE
R :REC MODE
P :PB MODE
1
REC/PB HEAD AMP (RP BLOCK)
REC
SIGNAL
VIDEO REC/PB AMP
-REF
.NO.:1000 SERIES-
MA-388 BOARD(1/8)
VIDEO SIGNAL
B
4
E
10
12
9
D
11
C
7
3
26
5
F
8
G
2
TO(4/8)
19
TO(8/8)
TO(6/8)
3
FOR CHECK
B+
5.0
R4.1/
P5.0
R1.5/P0
R4.0/
P2.0
R4.0/
P2.0
R2.5/
P0
R4.0/
P2.0
R1.4/
P2.0
R1.4/
P2.0
R2.5/
P0
R1.4/
P2.0
R2.8/
P2.5
R4.3/
P0
R3.4/
P0
R3.4/
P0
R0/
P1.7
R0/
P2.5
R0/
P0.5
0.3
1.9
0
4.4
R0/P2.4
0
R0/
P1.7
5.0
R0/
P1.1
5
4
3
2
1
B+
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