Akai AM-U22 - Page 15

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1. FM SECTION ADJUSTMENTS (Refer to Figs. 8, 10, 11)
Unless
otherwise
specified,
use
teh
adjustment
points
provided
on
the
Tuner
P.C
Board
(Fig.
8).
2 Center
3 Voltage
of Output
Level «
Factor
Gs
5 |Confirmation
Resuit
———
Remarks
—
Maximum Noise
Level
BAND switch to FM, and MODE to MONO.
Turns only noise without interference from
broadcasting.
Ste Adjustment Adjustment
P Item Point
1 Front-end T1 (BLK)
IF Coil (Front-end)
Tl-a
Centered Tuning
Connect a Center Tuning Meter between TP1
3 Distortion T1-b
Meter and TP2. (See Note 1)
Indication Turns only noise without interference from ~
broadcasting.
Distortion 98 MHz, 60 dB, 1 kHz (mono 100%) input.
Factor: Less than 0.1%
0 dBm +3 dB
Less than 0.1% in both channels.
Readjust in Steps 2 and 3.
98 MHz, 60 dB, 1 kHz (mono 100%) input.
pa
6 Signal LED
Sensitivity
7 ~~ | Digital LED
Display
Frequency
(AT-K22/L
Only)
Board (Fig. 10)
VR2 (30 K) 98 MHz, 50 GB input.
Adjust VR2 to a point where 5th LED of
SIGNAL LED lights up. (See Note 2)
VRI (10 KB) Apply a 98 MHz, 60 dB input.
Counter P.C Short TP1 to GND on the Counter P.C Board.
Adjust VR1 until 3rd numeral display becomes
stable position. (See Note 3)
8 High Range TC3 (Model AT-K11/L) 108 MHz, 60 dB, 1 kHz (mono 100%) input.
Scale (Front-end) Maximum Output Scale indicator to 108 MHz.
Indication ‘ Minimum Distortion Error: Within + 250 kHz.
Factor
(Model AT-K22/L) Turn tuning knob fully clockwise.
L Display 108 MHz by adjusting TC3.
9 High Range TCA, TCB Distortion Factor: MODE switch to MONO.
Sensitivity (Front-end) Less than 3% 108 MHz, Less than 6 dB, 1 kHz (mono) input.
10 |Confirmation Distortion Factor: 88 MHz, Less than 6 dB, 1 kHz (mono) input.
of Low Range Less than 3% (See Notes 4 and 5)
Sensitivity
11 |Muting Level VR1 (30 K) 22 dB+6dB MODE switch to STEREO.
98 MHz, 22 dB, 1 kHz (mono 100%) input.
Adjust VR1 until the output signal is reduced
to zero.
Vary the SSG output by +6 dB and check mut-
ing operation.
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12 |PLLIC Free VR3 (4.7 K) 19 kHz + 50 Hz Connect a Frequency Counter between TP3
Running and GND on the Tuner P.C Board. (See Note
Frequency 6)
13 Stereo VR4 (500) More than 45 dB 98 MHz, 60 dB, 1 kHz (stereo 100%) Lch input.
Separation Minimum output of Rch.
(Left>Right)
14 Stereo VR4 (500) More than 45 dB 98 MHz, 60 GB, 1 kHz (stereo 100%) Rch input.
Separation Minimum output of Lech.
_|(Right>Left)