Sony TC-730 Service Manual page 34

18. Crosstalk (1) Deliver a 1 kHz signal of -50 dB (2.45 mV) to the
Measurement MIC jack.
Test Setup:
(between
tracks)
(2) Record the signal on the tape in the stereo
blank tape
REC Amp
AF osc record mode.
Note the VT VM reading.
Invert and reverse the reels.
oa Play back the tape.
_eoo
Measure the VTVM reading at both L-CH and
R-CH LINE OUTputs.
(7) Make sure that the difference between the step (3)
and the step (6) is more than 60 dB.
LINE OUT jack
Control/Switch Setting:
*Record volume control
recorded portion
GLI NLL
PLL.
bb toud dons ley eibeg ale specified position on page 25
MWY
*MONITOR switch ................
Specification:
more than 60 dB
Note: Use a well-demagnetized tape or a new tape.
19. Crosstalk
Measurement
Thread a blank tape.
Test Setup:
(2) Terminate the R-CH (L-CH) MIC jack with a
300 {2 resistor.
MIC jack
channels)
Deliver a 1 kHz signal of -50 dB (2.45 mV) to the
L-CH (R-CH) MIC jack.
Place the unit in the stereo-record mode.
Make sure that the level difference between L-CH
and R-CH is more than 45 dB.
LINE OUT jack
Control/Switch Setting:
Same as Item 18
Specification:
more than 45 dB
Note: Use a well-demagnetized tape or a riew tape.
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