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20. Overall
Frequency
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&
(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.
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.
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