Sony TC-730 - Page 35

20. Overall
Frequency
Test
Setup:
(1)
Set
the
TAPE
SPEED
switch
to
19
cm/s
(7-1/2
ips).
blank tape Thread a blank tape.
Response
AF
osc
REC
Amp
P
Measurement
(3)
Deliver
a
1
kHz
signal
of
-80
dB
(77.5
LV)
to
the
—_
MIC jack.
Place the unit in the record mode.
MIC jack oe TV TVM
(5) Note the VT VM reading.
(6) Change the frequecny of an audio oscillator to
50 Hz, 100 Hz, 5 kHz, 7 kHz, 10 kHz, 12.5 kHz
and 18 kHz in order and note the VT VM reading.
LINE OUT jack
(7) Make sure that the level deviation of each
frequency against 1 kHz signal is within the range
Control/Switch Setting:
*Recrod volume control
setnaiat Syece, doe specified position on page 25
*MONITOR switch .............---
*TAPE SELECT switch
See take Beals SPECIAL (with a SONY SLH tape)
specified.
Repeat the above steps (3) through (7) at the tape
speed of 9.5 cm/s (3 3/4 ips) and 4.8 cm/s
(1 7/8 ips).
bare wi Epens NORMAL (with a standard tape)
+2 4B
SPECIAL
blank tape
21. Overall S/N
Ratio
Measurement |A&
Test
Setup:
Thread
a
blank
tape.
(2) Deliver a 1 kHz signal of —60 dB (0.775 mV) to
the MIC jack.
osc
Place the unit in the record mode.
Record the signal on the tape, noting where the
recording begins for a later reference.
ages
Disconnect
the
audio
oscillator.
Rewind
a
half
of
the
recorded
tape.
Terminate the MIC jack with a 300 {2 resistor.
LINE OUT jack
(8) Place the unit in the record mode with no input
Control/Switch Setting: signal.
*Record volume control
Breage bhi bok specified position on page 25
(9) Make sure that the difference between two parts
is within the specification.
*MONITOR switch ..........-.-++--
=37 4
*more than 45 dB at 19 cm/s tape speed
LINE and POWER amp
EXT SPKR jack
Control/Switch Setting:
TREBLE, BASS and BALANCE controls
mechanical
MONITOR switch.
POWER AMP switch
SPKR SELECT switch
TAPE SELECT switch NORMAL
TAPE SPEED switch 19 cm/s
*more than 41 dB at both 9.5 cm/s and 4.8 cm/s
VT VM
distortion meter
mid
*Maximum output. . greater than +23dB (15 W)
less than 1 % (with power
amp output of 17 dB)
— 38 —
Procedures ;
Maximum Output Measurement
Deliver a 1 kHz signal of —60 dB (0.775 mV) to
Place the unit in the record mode.
Adjust the MIC volume control (R135, 235) to
obtain 0 dB (0.775 V) on the VITVM.
Turn the VOLUME control (R708, 808) fully
Measure the output level with the VT VM.
Distortion Measurement
Perform steps (1) through (3) of the above
Adjust the VOLUME control to obtain 17 dB
(5.49 V) on the VITVM.
Measure the distortion with a distortion meter.