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(7.5 KHz, 10 kHz and 12 kHz) with VR19 (CH-1) and
VR20
(CH-2), thereby keeping the deviation' within
3 dB.
thereby keeping the deviation within 3 dB.
ditions are satisfied.
aD"
OSC output 1V constant
Fig. 20
BIAS
OSCILLATOR
FREQUENCY
Record Head
Fig. 21
Instruments required: Audio frequency oscillator, oscil-
joscope, 100Q resistor
1. Remove the ground lead wire connected to the re-
cording head, and attach a 100Q. resistor in series.
2. Connect
the AF oscillator and the oscilloscope
to
both ends of the 100Q resistor.
3. Place the set in the recording mode.
4. Adjust the audio frequency oscillator to obtain the
frequency of bias oscillation which will be noted by
resonance.
5. The resonance
point is where the Lissajous' figure
becomes stationary, and the oscillation frequency is
indicated on the scale of the audio frequency oscil-
lator.
6. The standard oscillation frequency is 170~190 kHz.
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