Akai AT-S55/L

AUDIO
OSCILLATOR
1,000Hz
AC
RL=8 OHMS VOLTMETER
Fig.
10
Instrument
Connections
for
Power
Meter
Sensitivity
Adjustment
SPEAKER
OUT
DC
VOLTMETER
Fig. 11 Instrument Connections for Center Off-set
1. POWER METER SENSITIVITY
ADJUSTMENT (Refer to Figs. 8, 10)
Set the Meter Range switch to “x1”, and connect
the load resistor (RL=8 ohms) to speaker terminals.
Then apply a IkHz signal to the AUX input ter-
minals, adjusting the input level so as to obtain the
rated output voltage level (12.6V) at both ends of the
load resistor.
Adjust VR3 (left channel) and VR3b (right channel)
on the Pre Amp P.C Board so that the 7th LED (20
Watts) in the Power Meter light up.
34
Voltage Adjustment
2. SENTER OFF-SET VOLTAGE
ADJUSTMENT (Refer to Figs. 9, 11)
Connect the DC Voltmeter or Digital Voltmeter to
the speaker terminals. Adjust the VR1 (left channel)
and VR1b (right channel) on the Main Amp P.C
Board, so that the Voltmeter reads 0 t50mV.