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Sony CRF-230B - Page 30

Sony CRF-230B
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CRF-230B
Collector
Current
of
0502
1.
Band
Selector:
MW
2.
Select
the
resistance
value
of
R507
to
obtain
0.40+0.04V
at
the
emitter
of
Q502.
Then
collector
current
may
be
adjusted
at
800uA.
.
VOLTAGE
AND
CURRENT
ADJUSTMENT
D.
A.
Emitter
Voltage
of
Q201
1.
Band
Selector:
FM
2.
R202
is
to
be
selected
to
obtain
1.0+0.1V
at
the
emitter
of
Q201.
1-240-514
51ka
ee
von
[taesls
in
R202
pot"
1-240-5
16
62ka
1-244-708
30ka
1-240-517
68ka
1-244-709
33ka
E.
Regulator
Voltage
Adjustment
Select
the
resistance
value
of
R703
to
obtain
4.5+0.1V
at
the
emitter
of
Q701.
B.
Collector
Current
of
0401
.
Band
Selector:
MW
—
a"
.
Select
the
resistance
value
of
R402
to
obtain
0.27+0.02V
at
the
emitter
of
Q401.
Then
collector
current
may
be
adjusted
at
270yA.
1-242-717
68
ka
R401
<
1-242-718
75k
1-242-719
82ka
Collector
Current
of
Q501
.
Band
Selector:
MW
.
Select
the
resistance
value
of
R503
to
obtain
0.32+0.03V
at
the
emitter
of
Q501.
Then
collector
current
may
be
adjusted
at
600A.
1-240-514
51ka
1-240-515
56k2
ee
1-240-516
62k2
1-240-517
68
ka
—
30
—
1-244-652
1302
1-244-653
1502
1-244-654
1602
Re
1-244-655
1802
1-244-656
2002
1-244-657
2202
Tuning
Meter
Calibration
.
Band
Selector:
FM2
.
Supply
a
98
MHz
signal
of
310uV
(50dB)
to
the
FM
EXT
ANT
(75
ohms)
terminal.
.
Adjust
the
adjustable
resistor
VR201
(5ka)
so
that
the
meter
indicates
between
8
and
9.
(See
Fig.
3-20).

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