Yamaha K-1020 Owner's Manual page 10

The ORBIT system, with its microcomputer 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 display and adjusting the Bias fine adjustment
control. |
• When the TEST button is ON, recording and playback cannot
take place.
Display
Tres — [sn
| Lights up | Light up
"з пр сс» а жок e ee ee a
ЖҮ: Operation
(p
p ——————— — — сше че сз ме кө {сс d
ME
--і
m с) =4
Q
zZ
Recording start
Ж y «e oe веш AR o сале асы «M^
During adjustment
Auto stop
i
Auto Rewind
How to Adjust
1 Load cassette tape to be recorded.
2 Press ORBIT TEST button to the ON position.
3 Press the REC/PAUSE button and the PLAY button. The deck
then enters the recording mode.
4 Watching the tuning display, adjust the Bias control to give a flat
frequency response.
е Refer to bias—frequency response curve.
The frequency response is flat when the tuning display is as
shown.
"Bias vs. Frequency Response
Recording Frequency Response
ДАДЕ ELTITI UIN.
ТОШОП
Frequency (Hz}
Response (dB)
м
©
-4
i
-
sot ЕШШ ШШШ
-40 ГІГТІШІГІТТІШІГІІТІІШ
Respose (dB)
№ о
Response (dB)
Frequency (Hz)
Tuning Display
led | | BIAS la [>> | BIAS la «d
+ ШИШ
pm 20 100 200 500 1000 2000 5000 ЮООО 20000 40000 — 20%
|
Ш | BIAS | BIAS D> [<a |
|
lOHz 20 50 100 200 500 1000 2000 D DD ан
ШЕШШ! ШГА
Specs in ІВ ЕНІН | BIAS I< |
ІШ
tOHz
20 50 100 200 500
1000 2000 5000 10000 20000 40000
— 2095
6 The bias is now set to its optimum value.
Bias Control
Optimum Bias
Flat frequency response
Sound quality normal
+20%
ж Біаз
(Over Bias)
High frequency response
-20% +20% Wop-off.
Insufficcient Bias
(Under Bias)
High frequency response
+20% rising.