Akai M-9 - ADJUSTMENT OF D.C. COLLECTOR CURRENT FOR POWER TRANSISTORS 2 SC-490 WITH NO INPUT SIGNAL

ADJUSTMENT
CF
D.C.
COLLECTOR
CURRENT
FOR
POWER
TRANSISTORS
2SC-490
WITH
NO
INPUT
SIGN
AL
(SEE
FIG.5)
Disconnect
the
wire
between
points
(a)
and
(b),
(c)
and
(d).
Connect
the
Ampere
Meter
(use
one
with
Milli-Ampere
Scale)
to
the
points
(a)
and
(b),
(c)
and
(d).
Connect
the
point
(e)
to
the
Earth
position.
Turn the Volume Control back to the minimum position.
Turn
the
Volume
VR-301
(100-B)
until
the
D.C.
Collector
Current
reaches
28
mA.
a
TR303, 304.
+20 (Q) FIIA
O O
Facer
Fig. 5
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