Page 1
KD-A77A/8/C/E/J/U
r-
Contents Specifications
.........................................................
2
Features
..................................................................
3
Controls and Connections
..........................................
3
Main Parts Location
...................................................
4
Maintenance
............................................................
4
New
Technique
......................................................
5
Removal
of
the Main Parts
..........................................
6
Main
Adjustments
...................................................
1 0
Block Diagram
......................................................
16
Integrant Circuit
......................................................
18
Standard Schematic Diagram
of
KD-A
77
Amplifier
circuit
................................................
1 9
Mecha. control
circuit
..........................................
20
Wiring
Connection
(1 ) of
KD-A 7 7
..............................
21
Specifications Type Track
system
Tape speed
Frequency response
OVU
Metal
tape
SA/Cr02
tape
-20VU Metal
tape
SA/Cr02
tape
* 1 *2
SF/Normal tape
* 3
SIN ratio Stereo
cassette
deck
4-track,
2-channel
1-7/8
inch/sec
(4.8
cm/sec)
25-12500Hz
±3dB(Typical)
25
-8000Hz
± 3dB(Typical)
15-20000Hz 25
-1
8000Hz
± 3dB(Typical)
15-20000Hz 25-
1 8000Hz
± 3dB(Typical)
15-19000Hz 25-17000Hz
±3dB(Typical)
Surpases DIN
45
500
60dB (from peak level, weighted,
Metal tape)
The SIN is improved by 5dB
at
1 kHz and by
10dB
above 5kHz
with
ANRS on.
(DIN 45
500
weighted)
Effect
of
Super ANRS : (normal tape)
Improvement
of
SIN : the same
as
with
ANRS
Improvement
of
frequency response
:
OVU
recording; 6dB
at
10kHz
+ 5VU recording; 12dB at 10kHz
Improvement
of
distortion
Wow
and
flutter
Crosstalk Hormonic
distortion
Bias
Erasure
Heads
No.4186
OVU
recording; 3 % or less
at
10kHz
+ 5VU recoridng;
3 % or less at 10kHz 0.04%
(WRMS),
0.14%
(DIN
45
500)
65dB
(1 kHz)
K3;
0.4%,
THD:
1.0%
(metal tape, 1 kHz OVU)
AC bias
(85kHz)
AC erasure
(85kHz)
3 heads SEN
ALLOY head
for
recording,
SEN
ALLOY X
cut
type
for
playback and
two-gap
SEN
ALLOY head
for
erasure Wiring
Connection (2)
of
KD-A77
..............................
22
Enclosure
Ass'y
and Electrical Parts
...........................
25
Enclosure
Ass'y
and Electrical Parts List
..................
23
Mechanical Components Parts
.................................
26
Mechanical
Components
Parts List
........................
28
Printed Wiring Board Parts
Main
Amp.
P.W. Board Parts
....................................
33
Power Supply P.W. Board Parts
.................................
34
Main
Amp.
P. W.B
Parts List
.................................
30
Power
Supply P.W.B Parts List
..............................
35
Other
P.W.B Parts
...................................................
37
Other
P. W.B
Parts List
.......................................
39
Packing
......................................................
Back cover
Accessories
................................................
Back cover
Motors Fast
forward
time
Rewind
time
Semiconductors
Input terminals Output
terminals
Power requirement
Power consumption
Dimensions
Weight
FG
type
DC
servo
motor
(for
Capstan)
DC
motor
(for
Reel)
85
sec.
with
C-60
cassette
85
sec.
with
C-60
cassette
1 8 ICs,
49
transistors,
59
diodes,
14
LEDs
Mic jack x
2,
Max. sensitivity;
0.2mV
(-72dBs)
Matching impedance;
6000-10kO
Input jack x
2,
Min. input level;
80mV
(-20dBs)
Input impedance;
100kO
Output
jack x
2,
Output
level;
0-300mV
Output
impedance; 6kO
Matching impedance:
50kO or more
Phones jack x 1,
Output
level;
0-0.5mW/SO
Matching
impedance:
80-1
kO
AC
120V,
60Hz
(KD-AnCW
AC
240/220/120V,
50/60Z
(KD-A
n
A/B/E)
AC
240/220/120/1
OOV,
50/60Hz
(KD-A77U)
36W 17-3/4"
(450
mm) W
4-3/4"
(120
mm) H
12-7/16"
(316mm)D
18.3
Ibs
(8.3
kg)
Note:
* 1 ... SCOTCH MET AFINE or Equivalent * 2 ... TDK SA or Equivalent * 3 ... MAXELL
UD
or Equivalent
Design and specifications are subject
to
change
without
notice.
- 2 -
Page 2
Features 1. 3
SA
(SEN-ALLOY) heads
Combined
SA
(SEN-ALLOY) record/play (X-cut type)
heads make possible record monitoring. The erase
head is a 2-gap head also made
from
SA
(SEN-ALLOY).
2.
Two-motor
ID (independent Drive) mechanism
This mechanism incorporates a
newly
developed Back
Tension
system
which
gives improved tape
contact
with
the
head.
3.
Self-illuminated
buttons
for
full logic mechanical
operation (excluding STOP or REC-MUTE modes.)
4.
Three position Metal-Tape-Compatible tape select switch. METAL -FeCr _
SA/Cr02 NORM
(Automatic
switching
between
SA/Cr02
and NORM)
5. The
REC
MUTE
button
is at
the
right side
of
the
mechanical operation
buttons.
KD-An
A/B/C/E/J/U
6.
ANRS
which
reduces tape hiss
to
an
inaudible level
and Super ANRS
which
improves linearity
at
high fre
quencies are incorporated.
7.
MEMORY/AUTO
REW
switch
8. Recording equalizer
switch
9.
Timer
standby
capability
for
automatic
recording or
playback using an
AC
timer.
10.
Geared and oil-damped cassette holder.
11.
New
Metal-Tape-Compatible
multi-peak
level in
dicators
(+
9dB,
+ 6dB,
+ 3dB,
-2dB,
-7dB).
together
with
back-lit VU meters
with
the
expanded
coverage
from
+ 7VU
to
-20VU,
make level observa
tion
easier.
12.
OUTPUT volume (for LINE and HEADPHONES use)
13.
Remote control terminal (for
the
optional remote
con
trol
unit
-R-30E).
Controls and Connections
2 3
4 5
6
10
11
12
14
15
16
17
18
19
20
21
==
==
== ==
==
== ==
== == ==
r-
==
. .
==
'-
1.
VU
meters
and
Multi-point
peak level indicators
2.
INPUT LEVEL control
3.
TAPE
indicators
4.
ANRS/Super ANRS indicators
5.
Cassette holder
6.
MEMORY/AUTO REW
switch
7.
Tape counter/counter reset
button
8.
EJECT
button
9.
TIMER STANDBY
switch
10.
PHONES
jack
11.
MIC jacks
12.
INPUT SELECT
switch
13.
ANRS
switch
14.
TAPE
SELECT
switch
15.
REC
EQ
switch
1 6.
OUTPUT LEVEL
control
n LJ
-
22
23
24
[f]
r~:f ~1
r
-[
~
I
1 7. MONITOR
switch
1 8. Cassette Operation
buttons
~~
REW
(rewind)
button
~~
FF
(fast
forward)
button
~
PLA Y
button
- STOP
button
o
REC
(record)
button
11
PAUSE
button
REC
MUTE
button
19.
POWER
switch
20.
Power
cord
21.
Voltage select
switch
(KD-A
77
A/B/E/U)
22.
REMOTE CONTROL
socket
23.
LINE
IN
(REC)
terminals
24.
LINE OUT (PLAY) terminals
- 3 -
No.4186
