Akai AT-2650

xX.
AMPLIFIER
ADJUSTMENT
(AM-2650)
VOLTMETER or TESTER
(100 mV RANGE )
MAIN AMP P.C BOARD
M3 - 6504B
TROb
TR7b TR8b TRIOb
Fig.
26
Instrument
Connection
MAIN
AMP
P.C
BOARD
Peyes
e
M3-6504A
-——
VRI
1
KB
(L
ch)
VR2
VR3
IDLING
CURRENT
VRIb
1KB
(R
ch)
500B
500B
IDLING
CURRENT
(Rh)
Fig. 27 Adjustment Points
1.
IDLING
CURRENT
ADJUSTMENT
(Refer
to
Figs.
26,
27)
Step
|
Adjustment
Item
Adjustment
Point
Result
Remarks
4
1
Idling
Current
Rac
sae
15
mV
Use
a
Voltmeter
or
Tester
with
(Left
Channel)
(Main
Amp
P.C
Board)
|
+5
mV
DC
100mvV
range.
>
Idling
Current
VRI1b
1
kB
15
mV
(Idling
Current
is
30
mV
+10
mY)
(Right
Channel)
(Main
Amp
P.C
Board)
+5
mV
ie
Chat -3
*
Be
careful
not
to
damage
the
Power
Transistors.