Sony Discman D-50MkII Service Manual page 52

2e ee ne a ney
- ~ ee
dummy core
Match up the core
upper edge and
tape upper edge._» :
tape — y
erase head audio head
Fig. 1-28
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.
1-7. 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. 1-29. If not, readjust tape
path.
E min 0
E max 2 65%
. @ at 80% interval, mex 80%
Fig. 1-29
1-8. 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. 1-30)
Fig. 1-30
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. 1-31)
Fig. 1-31
7) At this time, check that the small output channel's
output satisfies the specification.
Specification: small output CH 1.0 — 2.0cm (Fig.
1-31 a )
8) Return oscilloscope V GAIN to its original state,
and return RF output level to the state in 3) with
CH balance.