Technics SU-C04

® How to remove the bottom board
Remove the 4 setscrews (Fig.2:O ~ @) of the bottom
board.
li
MEASUREMENTS
AND
ADJUSTMENTS
English
==—__292
e Setting of controls and instruments to be used.
—@
How
to
remove
the
power
transistor
1.
Sound
volume
...:...0
(minimum)
:
.
:
2.
DC
voltmeter
(capable
to
measure
5mV)
|
1.
Unsolder
the
power
transistor
as
shown
in
Fig.
3.
|
|
2.
Remove
the
4
setscrews
(Fig.
4:
®~
®
)
of
the
.
.....
DC
Voitmeter
Connections
|
Adjusting
Point
Adjustment
Procedure
|
heat-sink and the shielding plate setscrew (Fig. 4: @®) Lchannel_ : | VR301 -
--of
the
equalizer
circuit
printed
board.
|
Bottom
board
,
Between
and
(minus
probe)
*
Adjust
VR301
(L
ch.)
and
VR302
:
:
:
oe
tes
CQ
R
ch.
that
th
It
is
2mV,
3.
Pull
out
the
speaker
protection
circuit
printed
board.
|
|
~
Rohannel
VR302.
ee
;
ae
ares
ON
|
|
;
Between
and
(minus
probe)
|
°
;
4. Lift the heat-sink along with the power transistor.
5. To install the power transistor, apply heat diffuser
(silicone compound, etc.) on both sides of mica plate
and attach it to the heat-sink with setscrews. |
And
then,
secure
the
heat-sink
on
the
chassis
and
solder the power transistor. :
Deutsch ===
li
MESSUNGEN
UND
JUSTIERUNGEN
e@ Einstellungen und verwendete instrumente.
1. Lautsarke 0 (Minimum)
2. Gleichstrom-Voltmeter (zum Messen von 5mV geeignent)
Einstellungen
Gleichstrom-Voltmeter
bindungen
Einstellungspunkte
.
Einstellungsvorgang
Speaker
protection
L- Kanal
3
VR
|
See
Awiechen
ne
iinietent)
301
*
VR301
(L-Kanal)
und
VR302
(R-Kanal)
|
so
justieren,
dafé
die
spannung,
ca.
Ico
R-Kanal
VR302
1
Minuten
nach
dem
Einschalten
der
Zwischen
und
(Minustest)
stromzufuhr,
2mV
betragt.
Melt the solder of the power
transistor leg and shift down
the leg toward the heat sink
to remove it.
Mi
MESURAGES
ET
REGLAGES
Francs
© Réglages et appareils utilises
1. Volume sonore...... 0 (minimum)
2. Voltmetre 4C.C. (capable de mesurer 5mV)
.
Réglages
Connexions
du
voltmetre
C.C.
Point
de
réglage
Procédeé
de
réglage
- Heat-sink
=
Ser
ae
|
=
Power
|
ie
oe
Canal
de
gauche
ve
VR301
*
Régler
VR301
(canal
de
gauche)
et
VR302
transistor
e
|
——
®
Ico
Entre
(sonde
au
moins)
(canal
de
droite)
de
facon
a
ce
gue
la
tension
Fig.
3
&®
Canal
dedroite
vy
R302
soit
de
2mV,
environ
1
minute
aprés
la
mise
9:
Entre
et
(sonde
au
moins)
en
marche
de
la
tension
d’alimentation.
Fig. 4
Hi
VARIABLE
RESISTORS
a
a
Se
;
Special
‘’C’’
_
‘B’’ characteristic characteristic
e Variable resistors used in this unit “a
The sound volume VR and circuit adjusting semifixed volume VR
are using ‘‘B’’ characteristic of which resistance varies in proportion
to rotational angle. Treble volume VR uses special ‘’C’’ character-
istic of which both ends of volume are open at the middle. Bass
volume VR _ uses special ‘'’C’’ characteristic of which both ends of
Resistance value
Rotational angle
volume are short-circuited at the middle. . Special “C’ New"G" |
Balance
volume
VR
uses
‘’G’’
characteristic
of
which
the
resistance
characteristic
characteristic
value
is
constant
at
the
middle.
:
|
|
.
Flat
ae
—
a
Short
.
J
:
| 7
Left
channel
Right
channel
Front
:
Ica
Ica