Akai AM-U55/J - Page 13

1. AM (AT-S55L: MW) SECTION ADJUSTMENTS (Refer to Figs. 5 to 8)
Unless otherwise specified, use the adjustment points provided on the Tuner P.C Board (Fig. 5).
Step Gjustneet ss a Result Remarks
Item aR Se a
Ti (BLK)
1
Clock
Synthesizer
420kHz
Connect
a
Frequency
Counter
between
IC3
Pin
Frequency P.C Board (28) and GND on the Synthesizer P.C Board.
(Fig. 7)
latent Re are ) Connect a Frequency Counter between JP1
2 sable yamenzet 400Hz (1C3 Pin (32)) and GND on the Synthesizer P.C
requency P.C Board
: Board.
(Fig. 7)
vcl 118.800MHz BAND switch to FM.
3 PLL Synthesizer (Digital display Connect a Frequency Counter between FM OSC
Frequency P.C Board indicating frequency | and GND on the Synthesizer P.C Board.
(Fig. 7) +10.7MHz) Adjust the Digital Display to 108.1MHz.
BAND switch to AM (MW).
4 AM (MW) OSC T6 (RED) 719kHz Short TP6 to GND on the Tuner P.C Board.
12
5 AM IF Coil
}————}----_—
Low Range
Sensitivity
¢ 600kHz
(603kHz)
High Range
Sensitivity
1,400kHz
(1,404kHz)
Signal LED
Sensitivity
is eae Maximum Output
Bar Antenna
Core Maximum Output
ATSS55: Distortion
Fig. 5 Factor:
AT-SS5L: Less than 10%
Fig. 6 :
Maximum Output
Distortion Factor:
Less than 10%
Connect a Frequency Counter between AM OSC
and GND on the Synthesizer P.C Board.
ee coal
1,000kHz (1,008kHz), 50dB, 400Hz (30%) input.
600kHz (603kHz), 50dB, 400Hz (30%) input.
1,400kHz (1,404kHz), 50dB, 400Hz (30%) input.
1,000kHz (1,008kHz), 74dB input.
Adjust VR7 to a point where 5th LED of SIGNAL
LED lights up.