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Harman Kardon DC5300 - Understanding Display Indicators; Transport and Mode Status; Function and Signal Indicators

Harman Kardon DC5300
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BLOCK
DIAGRAM
INPUT
LEVEL
VR203,
204
a
input
©
PLAYBACK
AMP
Q101-106
8}
SWITCHING
RPHI
oy
PRIMARY
J
EQUALIZER
CIRCUIT
Q201~
212
PLAYBACKAMP}]
{i
i
Q151-156
PH1
SECONDARY
~~.
EH1
ERASE
X
9
HEAD
CIRCUIT
DESCRIPTION
PLAYBACK
SIGNAL
The
signal
from
the
playback
head
(Primary
Transport)
is
amplified
by
the
playback
amplifier
Q101,
Q103
and
Q105
(Lch.),
and
is
applied
to
the
pin
29
(Lch.)
and
2
(R
ch.)
of
the
Dolby
NR
IC501
(B/C
type)
through
the
Switching
IC701.
Use
the
same
signal
for
both
the
secondary
transport
and
the
primary
transport.
Switching
of
the
playback
signal
from
the
record
mode
(external
input
signal)
to
the
playback
mode
is
per-
formed
inside IC501.
1C501
is
usually
switched
to
the
playback
mode.
How-
ever,
the
control
signal
transmitted
to
the
pin
5
of
IC501
‘from
1C751
through
Q505
and
Q506
switches
IC501
from
the
record
mode
to
the
playback
mode.
The
input
signal
to
1C501
is
output
from
the
pins
25
(Lch.)
and
6
(R
ch.)
and
applied
to
the
OUTPUT
AMP.
RECORD
SIGNAL
The
signal
from
the
INPUT
jack
is
controlled
by
the
INPUT
LEVEL
control.
It
is
applied
to
the
pins
30
(L-ch.)
and
1(R
ch.)
ofthe
Dolby
NR
IC501
(B/Ctype):
Switching
of
the
record
signal
from
the
playback
mode
to
the
record
mode
is
performed
inside
IC501.
The
control
signal
transmitted
to
the
pin'5
of
IC501
from
1C751
through
0505
and
0506
switches
IC501
from
the
play-
back
mode
to
the
record
mode.
The
input
signal
to
the
Dolby
NR
IC
is
output
from
the
pins
28
(Lch.)
and
3
(Rch.)
of
C501
and
passed
through
the
MP
X
filter.
Then
it
is
input
to
the
pins
27
(Lch.)
and
4(R
ch.)
and
is
output
from
the
pins
24
(L
ch.)
and
7
(R
ch.).
The
encoded
signal
is
input
to
the
pins
23
(L
ch.)
and
8
(Rch.)
and
then
it
is
output
from
the
pins
18
(Lch.}
and
13
(R
ch.).
The
signal
output
from
1C501
passes
through
the
record
equalizer
circuit
and
is
amplified
by
the
record
amplifier
of
1C201.
The
amplified
signal
is
then
applied
to
the
recording
head
after
being
synthesized
by
a
bias
signal.
MPX
DOLBY
B.C
NR
CIRCUIT
C501
Q505,
506
$913
S910 S909
S911
S914 S904 S908
uA
“©
output
J2
OUT
REMOTE
3
IN
1
———=—5
[><]
SOLENOIA
nREEL
16801}
an
EEE
CAPSTAN
LOGIC
CONTROL
10
MOTOR
(C751
[><]
SOLENOIA
REEL
ein
SECONDARY
CAPSTAN
MOTOR
MAIN
CONTROLLER
IC901
$902 $905
$916
$920 S918
MUTING
OPERATION
The
signal
that
mutes
the
sound
produced
at
switching
to
recording
or
playback
is
applied
from
IC751
of
the
logic
contro!
block.
When
the
“STOP”
button
is
pressed,
the
mute
signal
output
from
the
pin 22
of
1C751
turns
ON
Q709
(L
ch.)
and
Q710
(R
ch.)
to
short-circuit
the
output
signals
of
the
playback
amplifiers
for
muting.
For
the
purpose
of
preventing
generation
of
noise
at
power
ON/OFF,
the
mute
signal
is
output
from
Q51.
The
muting
is
done
by
short
circuiting
the
output
signal
with
Q709
(L
ch.)
and
Q710
(R
ch.)
turned
ON.
LOGIC
FOR
RECORD
MODE
When
the
“REC”
button
is
pressed,
the
pin
11
of
iC751
becomes
high
level
and
0109
(L
ch.)
and
Q110
(R
ch.)
turn
ON.
The
input
to
the
Dolby
NR
IC
is
muted.
Also
Q712
and
Q713
turn
ON
and
Q711
turns
OFF.
Therefore
Q701,
Q703
(L
ch.)
and
Q702,
Q704
(R
ch.)
turn
OFF
to
release
the
muting
of
the
outputs
from
the
record
amplifiers.
Also,
0505
turns
ON
and
Q506
turns
OFF
to
make
the
pin
5
of
IC501
high
level.
Therefore
the
mode
is
switched
to
the
record
mode.
LOGIC
FOR
RECORD
TO
PLAYBACK
MODE
When
the
“STOP”,
“PAUSE”
or
“PLAY”
button
is
pressed,
the
pin
12
of
C751
becomes
high
level.
0219
turns
ON
and
0213
(Lch.),
0214
(R
ch.)
turn
ON
to
mute
the
inputs
to
the
record
amplifiers.
Also,
Q712
and
Q713
turn
OFF
and
Q711
turns
ON
to
turn
ON
Q701,
Q703
(L
ch.)
and
0702,
Q704
(R
ch.).
Therefore
the
outputs
from
the
record
amplifiers
are
muted.
Also,
0505
turns
OFF
and
0506
turns
ON
to
make
the
pin
5
of
{C501
low
level.
Therefore
the
mode
is
switched
to
the
playback
mode.

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