Technics RS-D225W - Page 14

4 (Mechanism (1))
3 (Mechanism (2))
al Tape Speed Adj.
“3
PN1 (Mechanism (1))
PN2 (Mechanism (2))
1), (2) P.C.B.
er are clean.
> (68 +9°F)
|B); QZZCFM
Jain adjustment
RA
villoscope
Digital frequency
counter
Playback
frequency
response
(TAPE
[1],
[2))
1.
Test
equipment
connection
is
shown
in
Fig.
4.
+64B}—
—t}
+4
tte
te
Is
Hy
te
+508
2.
Playback
the
playback
frequency
response
part
(815Hz,
+4«a}
-
4
He
ifs
SAE
ETT
308
12.5kHz~63Hz,
—20dB)
of
the
test
tape
(QZZCFM).
+208}
Hi
|
4
ST
a
3.
Check
that
the
frequency
is
within
the
range
shown
inFig.5
08}
—-
1
-—
-
SG
a
for
both
L-CH
and
R-CH.
~
208
——
25M
ee
Output
Point
a
Hr
Poy
*
Elceae
—6d8}
—t-4}
+t
1H
|
pet
pf
man li i 1 a
63Hz toonz 1 315Hz TkHZ 2kHZ2 4kHZ 8kHz 12.5kHz
Fig. 5 200Hz2 ©500Hz
Fig. 4
Playback
gain
adjustment
(TAPE
[1],
(2)
1.
Test
equipment
connection
is
shown
in
Fig.
4.
2.
Playback
the
playback
gain
adjusted
part
(315Hz,
0dB)
of
the
test
tape
(QZZCFM).
3.
Adjust
TAPE
[1]:
VR1
(L-CH)
{VR2
(R-CH)}
and
TAPE
[2]:
VR3
(L-CH)
{VR4
(R-CH)}
so
that
the
output
is
within
the
standard.
[
Standard
value:
0.4
+0.5¢B
(0.02V)
a
Overall frequency response (TAPE [2))
1. Test equipment connection is shown in Fig. 6, and connect a
jumper of TP6. (See page 9).
2.
Set
a
normal
blank
tape
(QZZCRA)
and
record
by
applying
signal
(50Hz,
100Hz,
200Hz,
500Hz,
1kHz,
4kHz,
8kHz
and
10kHz),
20dB
attenuated
from
the
reference
input
level
signal
=
=
ee
EET,
<
~
(1
kHz,
—24dB).
AF
oscillator
=
ATT
GND
EVM
Oscilloscope
3.
Playback
the
signal
recorded
in
step
2,
and
check
that
the
Fig.
6
level
of
each
output
frequency
is
within
the
range
shown
in
Fig.
7
in
comparison
with
the
reference
frequency
(1kHz).
4.
If
it
is
not
within
the
standard
range,
adjust
the
bias
current
by
VR301
(L-CH)
{VR302
(R-CH)}
so
that
the
frequency
level
is
within
the
standard.
*
Level
up
in
high
frequency
range...........
Increase
the
bias
current.
+
Level
down
in
high
frequency
range......
Decrease
the
bias
current.
5.
After
that
increase
the
signal
recorded
on
CrO,
blank
tape
(QZZCRX)
and
metal
blank
tape
(QZZCRZ)
up
to
12.5kHz
and
adjust
in
the
same
way
as
mentioned
above
and
check
that
the
frequency
level
is
within
the
range
shown
in
Fig.
8.
6. After adjustment, cut a jumper of TP6.
Input Point
+60B --|+60B 4+60B ere
+4dB
4+4dB
+4dB
+4dB
+208
ond
js
+2qB
+2dB
008
0aB
00B
008
—2dB
+—|~
20B
—20B
—~20B
~40B
Hy
t+
!
ea},
908
—
4B
Pred
{48
se}
P——t
4
-
+
r++
4-648
~
648)
—
ep
Hl
~t-4
+H
14-608
Leitii
a
Ss
i
ittiot:
ri
tisi
i
_
pe
ee
rll
50Hz
100Hz
200Hz
SOOHz
tkHz
2kHz
4kHz
10kHz
50Hz
100Hz
200Hz
500Hz
1kHz
2kHz
4kHz
8kHz
12.5kHz
Fig.
7
Fig.
8
Overall gain adjustment (TAPE [2))
.
Test
equipment
connection
is
shown
in
Fig.
6,
and
connect
a
jumper
of
TP6.
(See
page
9.)
.
Set
a
normal
blank
tape
(QZZCRA)
and
apply
the
reference
input
level
signal
(1kHz,
—24dB)
in
record
pause
mode.
. Adjust the output 0.4V by attenuator and then record.
.
Playback
the
signal
recorded
in
step
3,
and
check
that
the
output
is
within
the
standard.
.
If
it
is
not
within
the
standard,
adjust
VR7
(L-CH)
{VR8
(R-CH)}
and
repeat
the
step
(2),
(3)
and
(4)
until
the
output
is
within
the
standard.
6. After adjustment, cut a jumper of TPS.
Ot w p=
vt 0.1
—o.08
| Standard value: 0.4
Dolby NR circuit
1. Test equipment connection is shown in Fig 9.
2. Set a normal tape and apply 5kHz signal in record pause
mode.
3. Adjust by attenuator so that the output between terminal ©
(L-CH) {terminal @ (R-CH)} of 1C401 and ground is 12.3mV.
4.
Turn
NR
switch
ON,
and
check
that
the
level
changes
as
specified from the level in NR out mode.
Standard value: 8+1.5dB
m@
MICROCOMPUTER
TERMINAL
FUNCTION
AND
WAVEFORM
(IC801:
MN1402STN)
Terminal
Function/operation
—_— ¢ Connection to GND.
P.B. mute ¢“H”’ in mute on, “L" in mute off.
Auto tape selector | *‘‘H” in 70S mode, “L” in 120uS mode.
——+
Bias | °“H”’ in bias off, “L” in bias on.
Direct muting | ¢“H” in mute off, “‘L” in mute on.
— ¢ Non connection.
Reading
of
input
¢L’’
when
auto
tape
selector
is
on
mode.
switch
state
tape
ATSion
[1] auto tape
selector (S909) TOM
OV
|
Reading
of
input
¢“L”
when
motor
switch
is
on
mode.
switch
state
tape
motor/on
1] motor (S904)
+5V
OV
Reading
of
input
e
“tL”
when
FF/REW
switch
is
on
mode.
switch
state
tape
FF/REW/on
(1] FF/REW (S906)
OV
Reading
of
input
e“L”
when
PLAY
switch
is
on
mode.
switch
state
tape
SLAVion
(1) PLAY ($902)
OV
Reading
of
scan
¢
Input
of
Tape
[2]
REC
switch,
Tape
[2]
PLAY
switch.
signal
output
*The
above-mentioned
inputs
are
read
in
accordance
with
DO,
DO1
scanning.
DO® output - “L’...... Reading of REC switch.
Rec/on
. a ae
OV
DO1 output > “L”’...... Reading of PLAY switch.
Play/on
7 eee
Reading of input *“H” When editing switch is on mode. .
switch state eee
editing
(S802)
editing/on
eer