JRC JFE-582, Service Manual

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TUNING POINT
When there is transducer checker , it doesn't need to have this check.
Check the tuning frequency of Transducer.
1 Transducer cable is remove from the terminal of Matching Box.
2 Measure the following core cables by the Oscillator (Signal Generator) and Oscilloscope.
3 Input following signals to White and black.
4 Signal monitoring by Oscilloscope.
5 Frequency is moved up and down, and a DIP point (Signal level minimum point)
is a tuning point.
6 The tuning frequency of transducer is normal if there is a dip point in the following range.
Oscillator Scope
Output Voltage 1 to 1.5Vp-p
Not tuning
Frequency
JFE-582 200kHz±5kHz
JFE-585 50kHz±1kHz
Tuning point
Normal tuning frequency range
JFE-582 200kHz ± 5kHz
JFE-585 50kHz ± 1kHz
Vp-p↑
fo = kHz
fo → f
JFE-582 fo =200kHz±5kHz
JFE-585 fo = 50kHz±1kHz
7 If the result of the measurement is except for the above range then transducer defective
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