Technics RS-M13 - Page 10

Borsvi3 ns-mi3 es RS-M13
ELECTRICAL PARTS LOCATION
ITEM MEASUREMENT & ADJUSTMENT
NOTE: A indicates that only parts specified
Measurement
Overall
frequency
response
chart
by
the
manufacturer
be
used
for
safety.
1.
Test
equipment
connection
is
shown
in
(Fe-Cr,
CrO2,
Metal)
12kHz
Part
Name
&
Description
fig.
32.
2kHz
y
:
ELECTRICAL
PARTS
2.
Place
the
normal
test
tape
(QZZCRA)
in
50Hz
——.200Hz
640
Hz
popes
EE
Eee
100
Hz
QWY4122Z
'
Record/Playback
Head
the
cassette holder.
+448
|
QWY2138Z
Erase
Head
3.
Place
UNIT
into
record
mode,
and
thpe
eae
Nut
126
+4
XSN3+8S
Screw
+
3X8
IL
Record/olayback
selector
to
normal
position.
0dB
'
XWA3B
Washer
head
4.
Supply
1kHz
signal
from
AF
oscillator
er
|
XTN3+10B
Tapping
Screw
+3X10
through
ATT
to
LINE
IN
,
nettes
Tapping
Screw
+3X8
‘
‘
‘
:
|
XT
+6B
T
S
2.6X6
5.
Adjust
ATT
so
that
input
level
is
—20dB
200Hz
40
Hz
QuTO015
tne
Tevinal
.
below
standard
recording
level
(standard
‘
TM
Oscilloscope
recording
level
=O
VU).
8
(
50H
100
Hz
Fig.
35
QKJ0405
Level
Meter
Holder
6.
At
this
time,
LINE
OUT
level
indicates
QSLILIIRNM
|
Level
Meter
0.039V
QNQ1039
Nut
9¢
:
:
QNQ1004
Nut
8¢
7.
Record
each
frequency
1kHz,
50Hz,
200Hz,
4kHz,
8kHz
and
10kHz
(12kHz
for
Fe-Cr,
CrO2
and
QWQ1133
Spring
Washer
9¢
i
29
metal).
QwQ2002
Spring
Washer
8¢
Ig.
22
on
page
5).
8.
Playback
and
express
in
dB
the
difference
between
playback
output
level
of
each
frequency
based
on
peers
pelea
as
playback
output
level
of
1
kHz.
QML3664
Recording
Lever
QJC0034 Earth Plate
9.
Make
sure
that
the
measured
value
is
within
the
range
specified
in
the
overall
frequency
response
chart
Grou:
Saree
position) (Shown in fig. 33).
! 10. Change test tape to Fe-Cr (QZZCRY), CrOz (QZZCRX) and metal (QZZCRZ).
= 11. Set the tape selector to each position.
12. Measure in the same manner from step (3) to step (8).
13. Make sure that the measured value is within the range specified in the overall frequency response chart
Record/playback for Fe-Cr, CrOz and metal tape (Shown in fig. 35).
QUP1922TN 6 Pin Post
QJS1921TN 3 Pin Socket
QJS1922TN 6 Pin Socket
QJT1054 Contact
SJA88 AC Power Cord
QKJ0407 Insulation Plate
QTD1164 Cord Clamper
XWG26 Washer 2.6¢
Adjustment—
Using
bias
current
QTF1054
Fuse
Holder
. . XAMQ46P 100 Pilot Lamp (for Level Meter)
=e OE ria - 1. When the frequency response between the middle and high
frequency
range
becomes
higher
than
the
standard
value,
as
arta
peg
shown by the solid line in fig. 36, increases the bias current QTWMO0026 Rotary Switch Cover
by turning VR7 (L-CH), VR8 (R-CH). XTS3+10B Tapping Screw 43x10
‘VM.
Oscilloscope
2.
When
it
becomes
lower,
as
shown
by
dotted
line,
reduce
the
.
aide
eta
3x16
32
bias
current
by
turning
VR7
(L-CH),
VR8
(R-CH).
IkH
2H?
BKM?
12kMz
XSN4+10
Screw
@4X10
{—- XSN26+8 Screw #2.6X8
Note:
Fig
36
XWA26B
Washer
2.6¢
For the method of bias current measurement, refer to “@ Bias
current adjustment” on page 8.
|
rt (Normal) @ Level meter 1. Test equipment connection is shown in fig. 37.
Condition: 2. Supply 1kHz signal from the AF oscillator, through the ATT (F400 mA) ve (7630 mA)
*
Record
mode
to
the
LINE
IN.
|
|\(T500mA)!
|
LOL | ay, |
* Input level controls --- MAX 3 se ATT so that the monitor level at LINE OUT becomes praia, cane in Recor neds vives ataties | de, “ph P|
; oN. is! ee aera
Equipment: , 4. Check to see that the level meter stays within the range of Fig. 37 | Gm a al * |
*VTVM + AF oscillator —1dB to +14B. res as 01218
: ce ; haope 5. If it is beyond the range, carry out the following adjustments:
eolster ) Short soldered points (D) (L-CH) and (F) (R-CH) indicated as “DOWN” where level more than +1dB.
¢ Short soldered points (C) (L-CH) and (E) (R-CH) indicated as “UP” where level less than --1dB. Note:
a
(See
wiring
connection
diagram
on
page
10.)
When
reolacing
parts
(Ref.
No.
D304),
mount
them
eninge:
so
that
they
are
raised
3
to
5mm
from
the
printed
nf
£24————
@ Dolby NR circuit . Test equipment connection is shown in fig. 38. ici-cyy TP9(L-CH) circuit board, as shown in Fig. A.
A when in use.
Condition:
2.
Place
UNIT
into
record
mode,
set
the
Dolby
NR
switch
icayecH)
Try
(RCH)
VTVM
*
Record
mode
to
OUT
position
and
supply
to
LINE
IN to
obtain
*
Dolby
NR
switch
---
IN/OUT
—34.5dB
at
TP9
(L-CH),
TP10
(R-CH)
(frequency
*
Input
level
controls
---
MAX
5
kHz).
a
_
Confirm
that
the
value
at
IN
position
is
8(+2.5)dB
AF
oscar
greater
than
the
value
at
OUT
position
of
Dolby
NR
D304
E23———
coo
—{
caa—[f
Ub
Equipment:
*VTVM_ * AF oscillator F
*ATT
«Oscilloscope
Sunt
Fig.
38
*
Resistor
(600
Q)
Oscilloscope
-Marking
Printed circuit board
Fig. A