JVC MX-J30 - Page 51

MX-J30/MX-J330/MX-J35R
@ Electrical Performance
[tens
|
Mesure’
|
Mensuromentmetnos
|
Sat
|
Seton
Adjustment
of
|
*Mode
:
Forward
or
1.With
the
recording
and
playback
mechanism,
recording
bias
|
reverse
mode
load
the
test
tapes(AC-514
to
TYP
and
AC-225
to
current
*Recording
mode
TYP
I
),and
set
the
mechanism
to
the
recording
and
(Reference
*Test
tape
pausing
conditions
in
advance.
value)
-AC-514
and
AC-225
|2.After
connecting
1002
in
series
to
the
recorder
Measurement
output
|
head,measure
the
bias
current
with
a
valve
terminal
voltmeter
at
both
of
the
terminals.
:Both
recording
and
|3.After
resetting
the
[PAUSE]
mode,start
recording.
headphone
terminals}
At
this
time,adjust
VR101
for
LCH
and
VR201
for
RcH
so that
the
recording
bias
current
values
become
4.04
A
(TYP
1) and
4.20
A(TYP
IL).
| Output
deviation
1.With the recording and playback mechanism, load
the test tape(AC-514 to TYP I1),and set the
Adjustment of
recording and
Reference frequency
:1kHz and 10kHz
playback
(REF:-20dB)
mechanism
to
the
recording
and
pausing
condition
|
between
frequency
Test
tape
in
advance.
1kHz
and
characteristics
|
:TYP
I
AC-514
2.While
repetitively
inputting
the
reference
frequency
|
10kH
signal
of
1kHz
and
10kHz
from
OSC
IN,
record
and
|
:-1dB+2dB
playback
the
test
tape.
3.While recording and playing back the test tape in
TYP II ,adjust VR101 for LCH and VR201 for RcH
so that the output deviation between 1kHz and
10kHz becomes -1dB+2dB.
Measurement input
terminal
:OSC IN
@
Reference
Values
for
Electrical
Function
Confirmation
Items
ee
a
ee
ce
*Recording
and
1.While
changing
over
to
and
from
BIAS
1
and
2,
bias frequency | playback side forward confirm that the frequency is changed.
or
reverse
2.With
the
recording
and
playback
mechanism.
*Test tape load the test tape (AC-514 to TYP I1),and set the
‘TYP AC-514 mechanism to the recording and pausing
*Measurement conditions in advance.
terminal BIAS TP on | 3.Confirm that the BIAS TP frequency on the
P.C.board P.C.board is 100kHz+6kHz.
Eraser current
(Reference
1.With the recording and playback mechanism,
load the test tapes(AC-514 to TYP IT and AC-225
*Recording and
playback side forward
value) or reverse to TYP I ),and set the mechanism to the recording
*Recording mode and pausing condition in advance.
*Test tape 2.After setting to the recording conditions,connect
:AC-514 and AC-225
Measurement terminal
Both of the eraser
head
1MQ in series to the eraser head on the recording
and playback mechanism side,and measure the
eraser current from both of the eraser terminal.
2-31