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m@ MEASUREMENT AND ADJUSTMENT METHODS
TP1
DC 12V H
is
VR9-VR10 yR301
VR302
Fig. 1
NOTES:
Set switches and controls in the following positions, unless otherwise specified.
e Make sure heads are clean
e Input level controls: Maximum
e Make sure capstan and pressure roller are
e Dolby NR switch: OUT
clean
e Dubbing/Mixing switch: OFF
e Judgeable room temperature 20+5°C (68+9°F)
e Dubbing tape speed switch: Normal
@® Head azimuth
Condition:
Equipment:
adjustment
e Playback mode
e VTVM
(TAPE [1] , TAPE
[2] )
¢ Normal tape mode
e Oscilloscope
° Test tape (azimuth)...QZZCFM
L-CH/R-CH output balance adjustment
1. Make connections as shown in fig. 2.
ake
CINE OUT
ecor
playback head
Playback mode
VTVM
Oscilloscope
2. Playback the 8kHz signal from the test tape (QZZCFM).
Fig. 2
Adjust screw (B) in fig. 3 for maximum output L-CH and R-CH levels.
;
When the output levels of L-CH and R-CH are not at maximum at the
CG. Recard/playback
locate angle B between
angles A and C, i.e., point where L-CH and
Screw (B)
R-CH outputs are balanced. (Refer to figs. 3 and 4.)
Fig. 3
L-ch peak level
R-ch peak level
Pat
L-CH/R-CH phase adjustment
outeut|
/
7 \
\
4. Make connections as shown in fig. 5.
ee
5. Playback the 8kHz signal from the test tape (QZZCFM).
Adjust screw (B) shown
in fig. 3 so that pointers of the two VTVMs
swing to maximum and a lissajous waveform as illustrated in fig. 6 is
obtained on the oscilloscope.
VIVM
Record/
Oscilloscope
playback head
Playback
mode
\
LINE OUT
Vertical
Horizontal
Fig. 5
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