26
8.7 REC/PLAY-BACK FREQUENCY RESPONSE
ADJUSTMENT
1) Insert the AC-225 tape in the holder.
2) Set the REC volume to the center position.
3) Supply 1kHz 30mV to the line input jacks.
4) Record the 400Hz and 12.5kHz signals by turns.
5) Playback the section just recorded, and adjust the fol-
lowing semi-fixed resistor so that the level of differ-
ences between 400Hz and 12.5kHz are within 1.0dB;
6) HIGH position and METAL tapes the following
Semi-fixed resistor so that the level of differences
between 400Hz and 12.5kHz are within 1.0dB.
8.8 REC/PLAY-BACK LEVEL ADJUSTMENT
1) Insert the AC-225 tape in the holder.
2) Set recording level at O.R.L and set a 0 dB.
Reference level. Frequency: 400 Hz
3) Play back the section just recorded. and adjust follow-
ing semi-fixed resistor so that the 400 Hz level is within
±
0.5 dB;
4) Only check HIGH POSITION and METAL tapes.
8.9 REC/PLAY-BACK FREQUENCY RESPONSE
CHECK DOLBY NR
1) Decrease the audio oscillator to 5.6 mV (-25 dB) from
the rated recording condition. Record the following
signals at DOLBY-B position. (NORMAL tape/position);
250 Hz, 1 kHz, 3 kHz, 6.3 kHz, 10 kHz, 12.5 kHz
2) Playback the section just recorded, and read differ-
ence levels are within the 3dB.
3) Do this same thing to DOLBY-C Position.
4) Do this same thing to HIGH POSITION and METAL
tapes.
CH.
ADJUSTMENT POINT
MECHA.
L
R901
A
R
R902
A
L
R951
B
R
R952
B
CH.
ADJUSTMENT POINT
MECHA.
L
RK05
A
R
RK06
A
L
RK55
B
R
RK56
B
METAL tape: Check only.
MECHA
HIGH
METAL
A
R913
-
B
R963
-
CH.
ADJUSTMENT POINT
MECHA.
L
R901
A
R
R902
A
L
R951
B
R
R952
B
MECHA
HIGH
METAL
A
R913
-
B
R963
-
CH.
ADJUSTMENT POINT
MECHA.
L
RK05
A
R
RK06
A
L
RK55
B
R
RK56
B
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