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Measurement condition:
| Instruments required:
HEAD
HEIGHT
ADJUSTMENT
Voltage...... 120V
Volume control...... Maximum
VTVM, AF OSC, oscilloscope, ATT, resistors (6000) ):
CONNECTION
CONNECTION
SPEC.
ITEM
MODE
|
ADJUSTMENT
REMARKS
VTVM to both ends |
|
|
—
of R63 (10Q) as | Record
VR7
paQean
oe Oe
Adjustment of
erase current.
Srownintiee
minimum.
aise
VTVM to both ends
a
Stop the bias oscillation
Tctofrecrtne fo izsen [REZ TOC. | pence | — | eng") | Dusen we
|
|
NOTE:
:
LINE IN ~26-+4 dB
:
;
current) | # 5
$ "
.
.
See fig. 12.
circuit board (page 6).
:
Head height adjustment can
$$
|
|
|
be done
from bottom side
pice
iiveer:,
000A
Oo BCE
ie
teens
amall Screw through a hole aS shown in
ESPON PlayOaCK: (1 ae SHOWA INAS:
MeO
E I N E
Playback|
——
0.6V
ieee
;
amplifier gain.
terminal.
fig. 8A..
13.
Fig. 8
Fig. 8A
:
A
a
a
ee eS
re
i
ee
|
MtetReRtOs
VTVM to both ends
_
|
Bee
caine
of R57 (left CH),
Basore
aan
Set volume control to
Berane
R58 (right CH).
minimum.
See fig. 14.
Test tape (VTT-801)
is recorded
with a 1kHz
tone
|
|
:
Adjust the AF OSC to
above and below track 2 and with 8kHz tone on track
Oscilloscope with
obtain a circular and
6 (fig. 9)
eee
er
AF OSC to both
Stationary lissaJous
ae
p
See Or eoeuenon
oe
ends of erase
Record
a
40+5kHz|
Pattern on oscilloscope.
1. Set the tape recorder to program 2.
frequency.
bos d-aSenawiia
The oscillation —
2. Connect a VTVM to the output of left channel
fi
Tea ey ie aes
Deter
OL ae
paid
Ig. 15.
by the scale of the AF
3. Playback
the test tape (VTT-801)
and adjust the
:
OSC:
Unit: mm
head height adjust screw
(A) shown in fig. 8 for
minimum output.
AZIMUTH
ADJUSTMENT
Instruments required:
Test tape (VTT-801), VTVM.
1. Set the tape recorder to program 2.
2. Connect a VTVM to the output of right channel.
3. Playback the test tape (VTT-801) and adjust the
azimuth adjust screw
(B) shown
in fig. 8 so that
the reading of the VIVM becomes maximum.
6000
1. Play each channel and measure
the power
ratio, |
2. If the ratio is out of tolerance, repeat the azimuth
|
'
(Oscilloscope)
(AFOSC)
— .
using the VTVM, between each odd and ever num-
and height adjustments.
:
|
| Fig. 15
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