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F
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A. Standard Tape
1. Connect a mV meter as shown in Photo ?.
2. Depress the REC lever and set the REC level
control at min, with bias and EQ buttons set
at STD.
3. Adjust the semi-fixed resistor VR301: L-ch,
VR302: R-ch so that the voltage between both
ends of the 10 ohm is resistor connected be-
tween the P/B head and ground is 1.b mV.
Usually, this adjustment will be enough. If
adjustment for a particular type of tape is
required, adjust according to the following
procedure(Fig. 21--8, F on page
)
4. Apply 333H2 signal to input jacks.
Record at the level of - 20dB on the VU me-
ters. (Use STD-601)
5. Change the frequency to 6.3kHz and record in
the same manner as above.
6. Reproduce the recorded signal, and compare
the levels. If the level of the 6.3kHz signal is
1.5dB higher than that of the 333H2 signal,
the bias is adjusted correctly.
7. If the level of the 333H2 signal is higher than
the 6.3kHz signal, it means that the adjustment
is set for over-biased.
In this case, decrease the bias current. If the
level of the 333H2 signal is more than 1.bdB
lower than the 6.3kHz signal, increase the bias
current.
8. Repeat the above steps 4-7
till the correct
value is obtained.
-----------> B ias level
B . C H R O M E T A P E
1. Connect a mV meter as shown in Photo Z.
2. Set bias and EQ buttons to CHROME.
3. Record 333H2 and 6.3kHz signals at the level
of - 20dB on the VU meters.
4. Playback the recorded signals and measure
them.
5. Confirm that the output level of the 6.3kHz
signal is 0 - 2dB higher than that of the 333H2
signal.
6. If it is more than 2dB higher than the level
of the 333H2 signal, increase the bias current.
If it is lower than the level of the 333H2 signal,
decrease the bias current.
7. Confirm that the output level of the 6.3kHz
signal is 0 - 2dB higher than that of the 33BHz.
o
+
d
6-
(D
A
I
I
F i g . 1 8
Photo 7
1 1 S k H z
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