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® How to remove the bottom board
Remove the 4 setscrews (Fig.2:O ~ @) of the bottom
board.
e Setting of controls and instruments to be used.
—@ How to remove the power transistor
1. Sound volume ...:...0 (minimum)
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
:
:
:
o e
t e s
CQ
R
ch.
that th
It
i s
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 ===
e@ Einstellungen und verwendete instrumente.
1. Lautsarke
0 (Minimum)
2. Gleichstrom-Voltmeter (zum Messen von 5mV geeignent)
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.
Francs
© Réglages et appareils utilises
1. Volume sonore......
0 (minimum)
2. Voltmetre 4C.C.
(capable de mesurer 5mV)
- Heat-sink
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
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