Bias Adjustment - Yamaha KX-800/U Owner's Manual

5. After completing bias adjustment, press BIAS TEST switch to off. The
tape will be rewound to the beginning of the bias adjustment.
• If the heads are dirty or the tape is unsatisfactory, etc., it may not be
possible to carry out bias adjustment.
• When the BIAS TEST switch is ON, ordinary recording and playback
cannot be carried out.
+20
0
m
::::
-20
-!
W
-40 >
W
- ! I-
-60
:::J
[l.
I- -80
:::J
0
-80 -60 -40 -20
INPUT LEVEL (dB)
+20
CD
~ 0
~ -10
~ =::
a:
-40
10Hz
frequency (Hz)
r
BIAS ••..•• ]
o
$
- 2(}\ +20'~
BIAS ADJUST
Optimum bias setting
Fiat frequency response
Normal sound quality
I
Insufficient bias (Under bias)
High frequency response rising
BIAS ADJUSTMENT
The ORBiT (Optimum Recording Bias Tuning) system, with its
microprocessor, makes the trouble-some task of bias adjustment easier
and clearer, so that tape performance can be fully exploited. The optimum
bias level can be set very easily; further adjustment is made to the bias
level selected by the auto tape selector, watching the BIAS tuning
indicator and adjusting the BIAS ADJUST control.
*
When the BIAS TEST switch is ON, recording and playback cannot
take place.
1. Load cassette tape to be recorded.
2. Press BIAS TEST switch.
3. Press the REC/PAUSE button and the PLAY button.
The deck then enters the recording mode.
4. Watching the BIAS tuning indicator, adjust the BIAS ADJUST control
so that both left and right indicators light to give a flat frequency
response.
~ 0
~ - 10
&. -20
~ -30
II -40
10Hz
Frequency (Hz)
Frequency (Hz)
I
BIAS
~'4IJ
o
- 20\ +20~,
BIAS ADJUST
Excessive bias (Over bias)
[BiA-s •• <II
o
§
- 20\ +20',
BIAS AD..JUST
12