Akai AT-S61 Service Manual page 20

AT-S61/L/J
ADJUSTMENT ADJUSTMENT
STEP ITEM POINT RESULT REMARKS
: : | BAND switch to FM, and MODE to
i FM IF Coil BER) MaxiiaeLNORS= fh ONO: "Tunes Only Holse Withee:
(Front End) Level .
terference from broadcasting.
4
Connect a Center Tuning Meter between
Centered Tuning TP4 and TP5 (See Note 1). Tunes only
Center Voltage a Meter Indication noise without interference from broad-
| casting.
3 Distortion 2 Distortion Factor: . ee aia 2); : ape noe
Factor Less than 0.2% UD: POW ae eae toga e e e cata
channels.
mi
4 Readjust in Steps 2 and 3.
MPX Free Connect a Frequency Counter between
5 Running VR7 76 kHz +50 Hz TP1 and GND on the Tuner P.C Board.
Frequency
. TCl1, TC2 : . ; MODE switch to MONO.
6 ee C3 Res 108 MHz (88 MHz), Less than 6 dB, |
y (Front End) kHz, (MONO) input.
[++
Confirmation . . 88 MHz (76 MHz), Less than 6 dB, 1
Distortion Factor: :
7 of Low Range Less than 3% kHz, (MONO) input.
Sensitivity (See Notes 2, 3)
: ; MODE switch to STEREO.
Pilot Signal VR8 afte :
8 Sancel (16, T7) Minimum Output 98 MHz (84 MHz), 60 dB (Stereo), Pilot
signal only input.
Stereo 98 MHz (84 MHz), 60 dB, 1 kHz (Stereo
9 Separation VR5 More than 45 dB 100%) Leh input.
(Left — Right) Minimum Output of Rch.
Stereo 98 MHz (84 MHz), 60 dB, 1 kHz (Stereo
10 Separation VR6 More than 45 dB 100%) Rch input.
(Right — Left) Minimum output of Lch.
98 MHz (84 MHz), 60 dB, | kHz (Stereo
Confirmation 100%) input.
1H of Stereo Distortion Factor: If distortion exceeds 0.5%, first ch eck ac-
Distortion Less than 0.3% cording to Steps 2, 3, 5, 9 and 10, and
Factor then readjust according to Step |.
98 MHz (84 MHz), 40 dB input,
D Signal LED VR? Adjust VR2 to a point where Sth LED of
Sensitivity SIGNAL LED light up.
(See Note 4)
13 Muting Level VRI 20 dB +6 dB MODE switch to STEREO.
98 MHz, 20 dB, 1 kHz (Mono 100%) in-
put. Adjust VR1 until the output signal
is reduced to zero. Vary the SSG output
by +6 dB and check muting oprrastion.
TONE
14 care VR3 275 mV AT-S61J only.
Level |