Pioneer RT-707 - Frequency Response and Recording Level Calibration

11.7
RECORD/PLAY
FREQUENCY
RESPONSE
RT-707
11.8 RECORDING LEVEL ADJUSTMENT
e Perform this adjustment after “Recording
bias adjustment”’ is complete.
e Connect a voltmeter (millivoltmeter) to the
LINE OUTPUT terminals and apply a 1kHz
signal to the LINE INPUT terminals(Fig. 33).
e Set the BIAS switch and EQ switch to LH
and
the
MONITOR
switch
to
SOURCE.
1.
Adjust
the
LINE
input
control
for
a
reading
of
-—TdBv
(450mV)
at the voltmeter
(millivolt-
meter).
2.
Reduce
the
input
level
20dB
more
without
moving
the LINE
input
control
and record/
playback
a 1kHz
and 15kHz
signal
at test tape
STD-502.
8.
Confirm
that
the
15kHz
level
deviation
for
1kHz is -3dB ‘1:5. When this deviation is
—4dB or greater, adjust to —-3dB with the bias
adjustment
semifixed
resistors
VR3o3
(L
ch),
VR304 (R ch).
Furthermore,
perform
this
adjustment
within
the range at which the bias does not become an
underbias
lower
than
the
maximum
sensitivity
bias value.
Playback amplifier assembly (RWF-069)
e Connect a voltmeter (millivoltmeter) to
the LINE OUTPUT terminals (Fig. 33).
e Apply a 1kHz —10dBv (316mV) signal to
the LINE INPUT terminal.
e Set the BIAS switch to LH and the EQ
switch to LH.
1. Adjust the LINE input control for a reading of
—7dBv (450mV) at the voltmeter (millivolt-
meter).
2. Adjust semifixed resistor VR3o,; (L ch) and
VR4302 (R ch) so that the voltmeter (millivolt-
meter) reads —7dBv (450mV) when the
MONITOR switch has been set to TAPE
while recording.
1kHz (test tape STD-502)
Output level
Maximum sensitivity bias
0. 208
Under bias Over bias
Fig. 36
Power and oscillation assembly (RWR-053)
PHOTO 1
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