Akai VS-2EGN

1) Connect VIF sweeper output 70 dB to the IF
terminal.
2) Connect the alignment scope to the AFT terminal
(in © of P1).
3) Give an optional size to the waveform with the IF
AGC volume, and make approximate adjustment
with L5 so that the marker will be positioned at
5-3 VIF ADJUSTMENT
(Vp-p
34.474C
(6.5)
P738.90(6.5)
36.67
Fig. 11-12
5-4 RF AGC ADJUSTMENT
V-AGC
1) Receive VH channel and connect oscilloscope to
the video out terminal (Pin @) of P2).
2) Adjust VR2, so that the Noise is disappears from
the Noise condition and sync. signal becomes
rather small.
U-AGC
1) Receive UHF channel, and connect oscilloscope to
the video output terminal (Pin @) of P2).
2) Adjust VR1 in the same way as U-AGC Adjust-
ment.
Service Manual VS-2EGN:
120
6th graduation of the alignment scope.
4) Stop with IF AGC volume before the waveform is
clipped (Fig. 11-9).
5) Adjust with LS so that the marker (EG/EGN=38.9
MHz) will be at 6th graduation of the alignment
scope (Fig, 11-10).
ALIGNMENT
SCOPE
Fig. 11-11
1) Apply VIF sweeper output of 70 dB to IF terminal.
2) Connect the Alignment scope to the intersection
between L6 and R22.
3) Connect dummy resistors of 100 ohms to both
ends of the tank coil (L4).
4) Set the alignment scope to 10th graduation by
means of the IF AGC volume and adjust the L3 so
that the marker position is as shown in Fig. 11-12.
5) Adjust the Tuner IF coil so that the P and C level
is as shown in Fig. 11-12.
5-5 AUDIO OUTPUT ADJUSTMENT
1) Apply DC 9.0V to Pin @ of P1.
2) Connect an AC voltmeter and a distortion meter
to Pin @ of P2.
3) Connect an oscilloscope to Pin @) of P2.
4) Add the following RF signals to ANT IN.
EG/EGN model VHF 12CH (color bar) } aaa
UHF 50CH (Philips)
5) Turn VR3 fully anticlockwise, and adjust with
L12 so that the reading of the AC voltmeter is
a maximum and that distortion factor is a mini-
mum,
6) Adjust with VR3 so that the reading of the AC
voltmeter will be —17 dB.