JVC DD-9 A - Block Diagram (2); Record, playback and computer circuit; FL meter circuit; Dolby C Block Diagram

DD-9A/B/C/E/J/U
Block Diagram (2)
= Record, playback and computer circuit
= FL meter circuit
PBgain
adjustment
Pre-amplifier P.B.EQ. selector Dolby C Circuit(PB)
X101 ~ X105 IC AO1, A02 ®
layback ~x
OP
y
hae
ae
x
XAQ1~
XA05
vibe
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Headphone
amplifier
VR102, 202 VR101 VR103
PBfrequency
4
IC
COl
IC
01
Headpone
jack
adjustment
?
a
XAI3
|
Dolby B/C, OFF
—20dB
adjustment
1€103 Select Micro-computer
InputVR
XC
O1~
XC
03
Rk:
circuit
VR701
LINE
IN
Meter
OdB
control
Input
selector
ae
Left/Right
Micro-computer
J
Microphone
amplifier
'
PB/REC
converte!
ICGIO__
circuit
i VRAQ3 selector | control
Microphone X107~ X109 P ICAO3, AOs 12% IC51 selector =
eS
XAD6~XAI2_
Te
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ate
orl!
Icoi4
<b
Gis
arts
Micro=
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REC/BES Rch
ircui
oN,
1@,
|
Peak-hold
typel
@F-7O
circuit
Balance
VR
Input
VR
Dolby
C
Circuit
(REC
eS
an
=
Hed
selector
oa
Test
signal
:
MONH
Recording
melas
TAR
2s
iLIest
sign’
ee
lcclor
O@IC52_VRI05,205
X113
IcGoB._ICE2
amp.
ICGO1
filter
ICGO1
C
CrO2
EQ
Sensitivity
Middle-
Middle—
(2
MD
aa
3)
x
select
o—
selector
Eeaency
frequencyt—o
~~
Recording
ICGI5S
BLe
@
circuit
ec
ICEO1
sub-am
selector
IC102
A
head
Recording Emitter LHEL
incuit
of
6
0
eve
j
]
el
t
OSC
circui
:
al
.
OSC
adjustment
follower
aad
ahg
Middle
Counter
er
ror
le
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8,3
KHz
)
filter
frequency High-f
Micro- ICG13 igh-freqency :
ating Mas compute uit a Micro ficeogroa| rade ae ae
os ircul , if
FC2H | control x11
Circuit
FC2H
computerf—*Micro.
Metal
&
FeCr
computer
:
head
|
ei
Micro-
FCIH
EKEE
FCIH
Reset
pone
4
signals
MER
circust
computer
XG03.16
XG0405
VR
107,109
;
a
:
Muting
circuit
VR
207,
209
Micro-computer
ilter
Micro-computer
LH8H-IH
:
Circuit
circuit
Mecha.
con.
REC
MUTE
ICGO4
SENS
Dolby
C
Block
Diagram
Tape
XG01,02
mode
control
control
asses
Deel
cent
ote
CEN,
EEE
Ce
ae
ot
Se
ahs
ds
BV8L~
BVIL
Micro-computer
circuit
Mecha.con.
output
select
|
ICGO5
|
()
I
|
!
To
Mecha.con.
@
:
REC/
REW
FCIH
OVER
SHOOT
|
rd
Micro-computer\
Lo
_
_
_
_
_
UIMITTER
|
fot
To
Mecha.
con.
G)
circuit
ce
STOP
|
—>
|
a
|
\
'@ Micro-computer
oF] * circuit . MAH
OVER SHOOT
ee
ee
es
ee
eee
z
L__—
LIMITER
follower
To Mecha.con. REC/REW
t
= a
TAPE
Lch
To Mecha.con. PLAY/ FF
Monitor
| SKEWING
FILTER
SATURATION
NETWORK
OVER SHOOT
LIMITTER
No. 4198