Overall Frequency Response - Technics RS-B465 Service Manual

RS-B465
OVERALL FREQUENCY RESPONSE
1.Insert the a Normal blank test tape (QZZCRA) and set
the unit to the Record Pause mode.
2.Apply a reference input signal (1 kHz, -24 dB) through
an attenuator.
3.Attenuate the signal by 20 dB and adjust the frequency
from 50 Hz ~ 10.0kHz.
4.Record the frequency sweep.
5.Playback the recorded signal and assure that it is within
the range shown in Fig.8 in comparison to the reference
frequency (1 kHz).
6.If it is not within the standard range, adjust VR301 (L-CH)
and VR302 (R-CH) so that the frequency level is within
the standard range.
7.Repeat steps 2 ~ 6 above using the CrOz tape(QZZCRX)
and the Metal tape(QZZCRZ) increasing the frequency
range to 12.5kHz (60Hz2~12.5kHz).
8.Assure that the level is within the range shown in Fig.9.
LINE IN LINE OUT
AF oscillator ATT EVM Oscilloscope
¢ Adjustment points
MAIN PC.B.
TAPE SPEED ADJ.
VR9OI (XI)
VR302 VR30l
Normal Overall frequency response chart (NR OUT)
5OHz 100Hz 200Hz SOOHZ 1kHz 2kHz
Fig.8
CrO,-Metal Overall frequency response chart (NR OUT)
5OKz 100Hz 200Hz SO0H2 1kHz 2kHz 12.5kHz2
Fig.9
Line Line
Out in
LJ]
= PLAYBACK GAIN ADJ.
VRi (Leh, VR2(Rch)
= OVERALL GAIN ADJ.
VR3(Lch), VR4(Rch)
OVERALL FREQUENCY RESPONSE ADJ.
VR3Ol(Lch), VR302(Rch)