Tascam 122 Service Manual page 35

122
r-------,
INPUT
L'=.!~~.!....J
S3-1
L
r O~__'A~__._--'T:.!;E~ST.!...o
L
LINE I
LINE 2
+23V
R ch
R330
NR
NR+HX
: NR
~
~-------------------------j
-3V
FROM
HX VARIABLE
EOUALIZER
BIAS/REC
CALIBRATION
R30
ADJUST
PRESET
5
DOLBY CODER U301
C304 R309
4
6
2
RI9
R316
I
INPUT
3
MPX
C310
NR 2
FILTER
R315
NR+HX
6
U305
OUTo
1
L - L -_ _ _ _
----"L-___ MONITOR
I
CIRI;UIT
r---------------
j
1
C305
,
SYSTEM :
Fig. 3·30 Line input circuit
LINE AMPL.
UI04
RI79 RIB7
C14~0
RI93
ORIBO
REC
LEVEL
RIBI
RIB9
RT"
""
@
DI
YIr---
+13V
RIBB
(ADJUST)
Fig.3-31 Line amplifier
HX VARIABLE EOUALIZER
LINE
U302
AMPLIFIER
RI95
RIB
NORMAL
()
Co (CrOzl
RECORD
METAL
AMPL.
RI93
S5-B
EQ
I
35