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3. ADJUSTMENTS
3-1. Driver Circuit Board Adjustments (Fig. 1, 2, 3, 4).
Note: 1. Master Volume.............-.+-+5- Minimum
2. Room Temperature ................ 10~35°C
3. For adjustment, run the unit for more than 5 minutes after ther power is switched on.
SUBJECT
EQUIPMENT
MEASURE
OUTPUT | ADJUST
ADJUST FOR
CONDITION
DC OV
DC Volt
Speaker Terminal
F-2507
OV
VRO2....Minimum
Meter
Fig. 4
VRO1
+10mV
(Counterclockwise)
:
(Fig. 3)
2)
Blas Current
DC Volt
F-2510
F-2507
20mV
_
Vv
Meter
2-4 (Connector Pin) | VRO2
% 1)
mor = POR
(Fig. 2)
(Fig. 3)
i
20
:
v
=
p04
=20mA
% 1) Instead of measuring bias current, set the voltage to 20mV by VRO2 between connector-pins
Bip an we
2 and 4 on both channels as Fig. 2, since there are no quick acting fuses in the power
TRo3p4 a
ee
amplifier sections.
3% 2) On one channel, bias current, |, is current which flows into one power transistor, 25C1585.
Nemaly, total current on one channel=1, x3
L-CH.......00. TRO1, TROS, TROO
R-CH_
........ TRO2, TRO6, TR10
Fig. 3
Back Panel
;
Fig. 2
Back Panel
=
1
uch'—rcu
VRO1 7 VRO1
Bottom Side
:
Fig. 4
'Speaker Terminal
F-2512
Connector Pin
RIGHT
LEFT
=
+
+
=
R-CH
L-CH
VRo2 || VRo2
oO
a
a
VoltmeterQ
N
nN
o
oO
a
®D
=
<
2
3
Volt meter©
Volt meter®
|
ee
e
°
°
Voitmeter@
a
4
in
in
nN
"
wu
is
bs
{
;
Front Panel
Front Panel
Tope Side
3-2. Power Meter Adjustment (Fig. 5, 6, 7)
RCH
LcH
Note: 1. Room Temperature
........ 18~28°C
VROu
fenee
ye
ares
2. Level Volume .............. Maximum
F-2515
S)
©)
F-2515
3. Input Signal ................ Sine Curve (1kHz)
| fewer meter | | |
i
4. Speaker load ..............0.
0000 c eee 80
5. For adjustment, run the unit for more than 5
Front Panel
minutes after the power is switched on.
is
Fig. 7
STEP
SUBJECT
OUTPUT
LEVEL
ADJUST
METER POSITION
1.
Power Meter
36.9V
F-2515
Togs
_ et
ug
Adjustment
(OdB)
VRO2
(Fig. 5)
Fig. 7)
2.
Power Meter
369mV
F-2515
—40dB
[aw
a
Adjustment
(—40dB)
R
(Fig. 6)
3.
Confirm the Step 1 again. If the meter position is not within OdB +1dB, repeat
'from step 1, 2.
% On both channels, above adjustments are necessary.
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