Technics RS-B465 Service Manual page 9

HEAD AZIMUTH ADJUSTMENT
.Playback the azimuth adjusment portion (8 kHz, -20 dB)
of the test tape (QZZCFM). Vary the azimuth adjusting
screw until the outputs of the L-CH and R-CH are maxi-
mized and the lissajous waveform, as illustrated, ap-
proaches 0 degrees.
Note: If L-CH and R-CH are not maximized at the same
point, adjust to the point where the levels of each
channel are maximized and equal.
2.Perform the same adjustment in the play mode.
3. After the adjustment, apply screwlock to the azimuth
adjusting screw.
TAPE SPEED ADJUSTMENT
1.Playback the middle portion of the test tape (QZZCWAT).
2. Adjust the VR901 so that the output is within the standard
value.
Stardard value: 3000 + 15Hz
PLAYBACK GAIN ADJUSTMENT
1.Playback the gain adjusted portion (315 Hz, 0 dB) of the
test tape (QZZCFM).
2. Adjust VR1 (L-CH) and VR2 (R-CH) so that the output is within
the standard value.
Standard value: 0.4V+0.5dB
PLAYBACK FREQUENCY RESPONSE
1.Playback the frequency response portion (315 Hz, 12.5
kHz ~ 63 Hz, -20 dB) of the test tape (QZZCFM).
2.Assure that the frequency response is within the range
shown in Fig. 6 for both L-CH and R-CH.
LINE OUT
OVERALL GAIN ADJUSTMENT
1.Insert the Normal blank test tape (QZZCRA) and set the
unit to the Record pause mode.
2.Apply a reference input signal (1 kHz, -24 dB). Attenuate
the output so that its level becomes OV.
3.Record this input signal.
4.Playback the signal recorded in step 3 above , and
assure that the output is within the standard value.
5. Hf it is not within the standard value, adjust VR3 (L-CH) and VR4
(R-CH).
6.Repeat the step 2 ~ 5 above until the output is within the
standard value.
Standard value: 0.4V + 0.5dB
RS-B465
Record/ Playback Head
Azimuth Screw
Fig.2
LINE OUT
Digital frequency
counter
LINE OUT
63Hz 100Hz 200Hz |SO0OHZ 1kHz 2kHz 4kHz
Fig.6
LINE IN LINE OUT
AF oscillator ATT EVM Oscilloscope