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4-3-24.
AUDIO LEVEL METER
ADJ.
BOARD
AUDIO C.B.A.
TP
AUDIO LEVEL METER
ADJ
CH1 : VR4505(B-3), CH2 : VR4506(B-3)
TAPE
INPUT
1 KHz,-8dBv SINEWAVE SIGNAL
MODE
STOP
M.EQ
SPEC
Hi-Fi: OdB, NORM: OdB
Note:
This adjustment should be performed only
after completion of 4-3-23.PRE-AMPLlFIER
ADJ.
1.
Set the audio output select switch to Hi-Fi mode.
2.
Set the Hi-Fi audio level control VR (CH1, CH2)
on the Front Panel to the centre click position.
3.
Supply 1 KHz, -8dSv sinewave signal to audio
inputs (CH1, CH2).
4.
Adjust VR4505 (CH1) and VR4506 (CH2) so that
the Audio Level Meter shows OdS as shown in
Figure E23.
AUDIO
LEVEL
METER
I::J
I::J
6
I::J
I::J
I::J
3
I::J
I::J
I::J
-
0
-
-
-3
-
-
-
LIGHT
-
-6
-
LIGHT
-
-
-
-10
-
-
-00
-
Figure E23
4-3-25.
NORMAL AUDIO FREQUENCY
RESPONSE ADJ.
BOARD
AUDIO C.B.A.
TP
AUDIO OUTPUT (CH1 ,CH2)
ADJ
CH1: VR4OO1 (B-1), CH2: VR4D03(B-1)
TAPE
VFM8180HADH, PORTION: 3
INPUT
MODE
PLAY
M.EQ
OSCILLOSCOPE
SPEC
400Hz
=
5kHz
(±
O.5dB)
1.
Set the VR4002 and VR4004 to centre position.
2.
Set thte Aduio output select switch to NORM.
3.
Connect a scope to Audio Outputs (CH1, CH2).
4.
Adjust VR4001 (CH1) and VR4003 (CH2) so that
the 400Hz and 5KHz levels becomes the same (0
±
0.5dS) as shown in Figure E24.
Note:
After this adjustment is finished, adjust 4-3-
26. Normal Audio PS Gain Adj.
400Hz
r----1
5kHz
r1
Figure E24
4-3-26.
NORMAL AUDIO PLAYBACK
GAIN ADJ.
BOARD
AUDIO P.C.B.
TP
CH1, CH2 AUDIO OUTPUT
ADJ
CH1 : VR4D02(B-1), CH2 : VR4D04(B-1)
TAPE
VFM8180HADH, PORTION: 3
INPUT
MODE
PLAY
M.EQ
OSCILLOSCOPE
SPEC
300mVp-p ± 15mV
Note:
This adjustment should be performed only
after completion of 4-3-25. Normal Audio
Frequency Responce Adj.
1.
Set the audio output select switch to NORM.
2.
Connect the a scope to audio outputs (CH1 ,CH2).
3.
Playback the alignment tape (Portion: 3).
4.
Adjust VR4002 (CH1) and VR4004 (CH2) so that
the levels become 300mVp-p
±
15mV as shown in
Figure 25.
AUDIO OUTPUTs
(CH" CH2)
, - - - - - - - 400Hz
Figure E25
4-11
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