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Sharp VC-90ET

Sharp VC-90ET
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Adjustment
of
playback
level
Measurin
Fiiode
|
Playback
(PAD
Input
signal
Alignment
tape
(VROCPSV)
(1kHz
level
control
signal)
Audio
output
terminal
Adjusting
point
R6325
(playback
level
control)
Specification
-
12+
1dBs
(L-ch
side)
1.
Play
back
the
alignement
tape
(1kHz
level
contro!
signal).
2.
Hook
up
the
VTVM
to
the
audio
output
terminal.
3.
Adjust
R6325
(playback
level
control)
so
that
the
output
level
be
-12
+
1dBs.
Checking
of
erase
voltage
and
oscillation
frequency
Oscilloscope
Recording
(PAL)
Both
ends
of
the
full-erase
head
Erase
voltage;
Over40Vp-p
Oscillation
frequency;
70
+
10kHz
1.
Place
the
unit
to
the
record
mode.
2.
Hook
up
the
oscilloscope
to
both
ends
of
the
full-
erase
head.
3.
Make
suréthe
erase
voltage
is
over
40
Vp-p.
4.
Be
sure
that
the
oscillation
frequency
is
70
+
10kHz.
Over
40
Vp-p
Measuring
instrument
Input
signal
Test
point
Adjusting
point
Specification
10Vidiv
5Spsec/div
60kHz
to
80kHz
about
three
divisions
Figure
2-24.
VC-90ET
Adjustment
of
bias
current
Measuring
.
Recording
(PAL)
freae—[——
TP6301
(SIG),
TP6302
(GND)
Adjusting
point
R6301
(bias
current
control)
Specification
260
+
10pA
(2.6mV
+
0.1mV)
1.
Connect
the
VTVM
TO
TP601
(SIG)
and
TP602
(GND)
on
the
main
unit.
2.
Place
the
unit
to
the
record
mode.
3.
Adjust
R6301
(bias
current
control)
so
that
the
bias
current
be
260
+
10pA
(2.6
+
0.1mV).
Checking
of
bias
leak
Measuring
riode
|
Recording
PAL/NTSC)
[adusineot_[———____
Specification
1.
Place
the
unit
to
the
record
mode.
2.
Connect
the
VTVM
to
the
audio
output
terminal.
3.
Make
sure
the
bias
leak
is
below
-20dBm.
Checking
of
recording
/playback
levels
aie
Self-recording/playback
PAL
/
NTSC
Specification
-8
+
2dBs
1.
Feed
1kHz,
-8dBs
signal
to
the
audio
input
terminal.
Make
self-recording
and
playback
of
the
signal.
Note:
For
Hi-Fi
recording,
feed
the
signal
to
the
left
and
right
channels
at
the
same
time.
2.
Make
sure
the
output
at
the
audio
output
terminals
is
-8
+
2dBs
for
playback
mode.
3.
If
out
of
spec,
readjust
the
erase
voltage,
oscillation
Frequency
and
the
bias
current.

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