Self-Recorded Rf Output Waveform Check; Pairing Check - Sony Discman D-50MkII Service Manual

3) Put KR5-1M into FWD.
4) Perform azimuth adjustment according to the
Service Manual.
5) While observing the audio head (Fig. 3-30) with
a dental mirror, match up the core upper edge
and tape upper edge as in Fig. 3-31, with the
two height adjustment screws and the azimuth
adjustment screw.
Turn the two height adjustment screws in the
same direction at the same angle, and the
azimuth adjustment screw in the opposite
direction at the same angle. Be sure to turn all
three screws.
height adjustment
audio azimuth
adjustment screw
Fig. 3-30
dummy core
Match up the core
upper edge and tape
upper edge. ——p»
erase head audio head
Fig. 3-317
6) From the position in 5), turn the two height
adjustment screws clockwise 70° and turn the
azimuth adjustment screw counterclockwise 70°.
(This adjustment makes the tape upper edge
0.1mm above the core upper edge.)
The ACE head adjustment affects tape path, so
it is necessary to perform exit side tape path
adjustment and CTL position and azimuth check
and adjustment.
Perform the exit. side adjustment and audio/
CTL position adjustment in the previous sections.
3-8. Self-Recorded RF Output Waveform Check
1) Set the tracking control knob to center click.
2) Record an on-the-air signal on an L-500 tape,
rewind and play back.
3) Confirm that the RF output waveform satisfies
the conditions in Fig. 3-32. If not, readjust
tape path.
Fig. 3-32
3-9. Pairing Check
1) Set the tracking control knob to center click.
2) Record an on-the-air signal on an L-500 tape,
rewind and play back. ;
3) Check CH-A, CH-B RF output levels.
4) Match up CH-A and CH-B RF output levels with
RP board CH balance (Fig. 3-33)
Fig. 3-33
5) Adjust oscilloscope V GAIN so that the RF
output waveform on the oscilloscope is 5cm.
6) Turn the tracking control knob to the right,
as seen from the front, and make the large
output waveform 2cm. (Fig. 3-34)
Fig. 3-34