Sony TC-366 - Overall Frequency Response Measurement

12-17. Overall Frequency Response Measurement
Connection:
As shown in Fig. 12-25.
Switch Setting:
MONITOR switch 0... TAPE
VR Setting:
AUX VOLUME............. indicated on page 25
Procedures:
(1) Be sure that the trap coil adjustment has
been made.
(2) Thread a blank tape.
(3) Deliver a | kHz signal of -40 dB (7.75 mV)
into the AUX INput jack and record the
signal on the blank tape and memorize the
VTVM reading.
(4) Deliver 50Hz, 100Hz, 5kHz, 7kHz,
12.5kHz and 18 kHz signals in turn and
record them on the blank tape and
memorize the VTVM readings respectively.
(5) Be sure that each deviation in level against
1kHz signal is within the values shown in
the table below.
If not, perform the record equalizer and
the record bias adjustments.
noe REC Amp. tape, blank
OL=he
_
AUX
-40d8
LINE OUT
Fig. 12-25 Overall frequency response
measurement setup
Deviation against the 1 kHz signal
tape
12.5kHz
speed
19cem/s | 4. a Fe :
Tips | 34B + 34B
9.5cm/s |+ 3
(334 ips) |- 1098
“4.8cm/s + 3
(1% ips) |- 10
dB
12-18. Overall S/N Ratio Measurement
Connection:
As shown in Fig, 12-26.
Switch Setting:
MONITOR switch......... TAPE
VR Setting:
AUX VOLUME............. indicated on page 25
Procedures:
(1) Thread a blank tape.
(2) Deliver a | kHz signal of -10dB (0.24V)
into the AUX INput jack and record the
signal on the blank tape.
(3) Remove the input connection of the audio
generator and terminate the MIC and the
AUX INput jacks with the dummy resistors
(MIC—6002, AUX-10k2).
(4) Rewind the recorded tape and erase a part
of the recorded tape (record mode with
no signal input).
(5) Be sure that the ratio of the recorded part
of the tape to the erased part on the VTVM
is more than 45 dB.
tape, blank
AF
osc REC Amp.
AU
1 kHz, -10 dB
LINE OUT
Fig. 12-26 Overall S/N ratio measurement setup
12-19. Distortion Measurement
Connection:
As shown in Fig. 12-27.
Switch Setting:
MONITOR switch ......... TAPE
VR Setting:
AUX VOLUME............. indicated on page 25
Procedures:
(1) Before measuring the distortion, be sure that
the trap coil adjustment has been made.
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