JVC RC-545L - Page 8

RC-545L/LB
Adjusting Recording Bias
Bias Frequency Bias Current
1.
Connect
a
frequency
counter
across
TP101.
1.
Connect
a
V.T.V.M.
across
TP101
and
TP201.
2.
Set
the
BEAT
CUT
switch
to
left
position.
2.
Adjust
the
variable
resistor
VR101
(L)
and
VR201
{R)
3.
Adjust
the
oscillator
coil
L301
so
that
the
counter
so
that
the
voltage
becomes
4.5mV
(450uA/109).
indicates 68kHz.
VR201
© © 1O) @
TP101
Fig. 12
Adjusting Head Azimuth
Regular Method
1. Connect a dual channel oscilloscope to the speaker
terminals.
. Set the MODE switch to the STEREO position.
. Playback the test cassette for azimuth adjustment.
4. Adjust the head azimuth so that the output signals of
left and right channels will become maximum and in
WN
phase.
Note: If a single channel oscilloscope will be used, apply
the
left
channel
signal
to
the
X-axis
and
the
right
to
Output
the Y-axis and draw the Lissajous figure.
Simplified Method
1.
Connect
a
V.T.V.M.
across
the
speaker
terminal.
2.
Set
the
MODE
switch
to
MONO.
—m
Angle
3.
Playback
the
test
cassette
for
azimuth
adjustment.
4. Adjust the head angle for maximum output.
Note: The output voltage shows three peaks while
adjusting head angle as illustrated on the right
adjust for maximum peak.
5.
Check
that
the
output
difference
between
MONO
and
STEREO is within 3dB.
No. 1388
Fig. 13
’