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Sanyo M7770K - SW2 Alignment; FM Alignment; FM Multiplex Adjustment; 38 kHz (V.C.O.) Adjustment

Sanyo M7770K
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Frequency
TUNER
ADJUSTMENT
(Continued)
SW2
ALIGNMENT
Alignment
Adjustments
Remarks
INPUT
OUTPUT
Generator
Calibration
|
Connect
AM
signal
oo
Ed
Obtain
sine-wave
of
400
Hz
of
generator
to
antenna
|
Connect
VTVM
with
and
maximum
amplitude.
a
ae
Range
|
terminals
(TP1
or
3.20hm
dummy
load
TP2)
and
oscilloscope
to
Adjustment
|
through
dummy
Phones/Ext.
Speaker
es
[
ane
[oe
of
antenna
terminal.
Tracking
(300hm/10
pF).
Repeat
the
above
steps
until
no
further
change
is
noted
in
any
of
the
adjustment.
Tuning
Dial
Setting
FM
ALIGNMENT
Standard
test
frequency
400Hz
and
deviation
22.5kHz
Tuning
Dial
;
Obtain
symmetrical
curve
and
maximum
amplitude.
Turn
T2
(blue
core)
Connect
output
Connect
input
fully
counter-
terminal
of
gene-
terminal
of
gene-
clockwise.
scope
to
pin
3
of
scope
to
detector
T1
Nd
Calibration
1C1
through
output.
;
capacitor
(10
pF)
(CN1-2
and
CN1-1
10.7
MHz
Low
End
or
CN1-3)
Obtain
S
curve
and
maximum
amplitude.
T2
(blue core)
Alignment
of
Signal
INPUT
OUTPUT
Generator
Calibration
Connect
FM
signal
|
87.2MHz
2MHz
a
a
Obtain
sine-curve
and
of
generator
toantenna
|
Connect
VT
VM
with
maximum
amplitude.
Tuning
Range}
terminals
(TP1
and
3.20hm
dummy
load
TP2)
through
and
oscilloscope
to
Adjustment
|
dummy
antenna.
Phones/Ext.
Speaker
of
(750hm,
unbalanced
|
terminal.
Repeat
the
above
steps
until
no
further
change
is
noted
in
any
of
the
adjustment.
FM
MULTIPLEX
ADJUSTMENT
|
38kHz
(V.C.0.)
ADJUSTMENT
1.
Connect
the
frequency
counter
to
the
sixteenth
pin
(TP7)
in
Prior
to
the
adjustment,
set
the
unit
as
follows:
|C3
and
a
resistor
(330
k-ohm)
as
illustrated.
@
Function
Switch
...............
0005
RADIO
(ON)
@
Band
Select
Switch
...........
0.00.
FM
2.
Adjust
the
potentiometer
(P1)
until
the
oscillation
frequency
@
Mode
Switch.............00
0c
eee
eee
STEREO
of
IC3
becomes
38kHz
(+20Hz).
@
Balance
Control..............
Center
(click
position)
©
TOne
CON:
6a45no
sn
Gee
ea
Maximum
@
Volume
Control
.........
0...
cee
ee
eee
ns
Center

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