Alignment Instructions; Alignment Of Fm Section - Pioneer SX-990 Installation, Operation And Service Manual

I
ALIGNMENT
INSTRUCTIONS
ALIGNMENT OF
FM
SECTION
Disconnect OUTPUT terminal
of front
end
from lN
terminal
of lF
unit
Position
of
Switch:
SELECTOR
....... FM
MONO
MUTTNG .........
OFF
Volume Control
Setting:
Fully
Counterclockwise
STEPS
I
nput
Level
Dial
Setting
Output
Equipment
Connections
Alignment
Equipment
Connections Frequency Adiust
Remarks
Sweep Generator
lN terminal
of
lF
unit 10.7MHz
40dB
Oscilloscooe
@
terminal
Tl
of
lF Unit
f2
T3
Adjust
for
maximum
sensitivity
and symme-
trical
characteristics
2
80dB Check symmetry
of
curve
3
Remove
electrolytic
capacitor
C12
(of
FM
lF
Un
4.71tFl in
detector
circuit
4
Sweep Generator
lN terminal
of lF
unit
10.7MHz 40dB
Oscilloscope
OUT terminal
Ta
of
lF Unit
Adjust the primary
core
of
T4
so
that
slope
of
straight
portion of "S"
curve
will
become the
steepest and adlust the
secondary
core so that
the center of "S"
curve
will
concide
with
the
center
of the
marker.
5
Connect OUTPUT terminal
of
fronted
to lN
terminal
of lF
unit
6
Sweep Generator
TP
of
Front-
end
10.7MHz
40dB
Point
of
no inter-
ference
as
near
as
88MHz
Oscilloscope
@
terminal
T2 of
frontend
Adjust
for
maximum
sensitivity and
symme-
trical
characteristics
7
80dB
Check symmetry
of
curve
8 40dB
Oscilloscope
OUT terminal
Ta ot
lF
Unit
Adj
ust similarly
to
STEP
4.
I
Connect electrolytic
capacitor
Cn
l4.7ltFl
10 Signal
Generator
FM
Antenna
terminal
9OMHz 2odB
(400H2
300/ol
90MHz Oscilloscope
V.T.V.M.
OUT terminal
L5 of
frontend
Adjust
for
maximum
deflection
't1
106MHz 106MHz
CTa
of
frontend
12 Repeat STEPS 10
and
1
several times
13
Signal Generator
FM
Antenna
terminal
90MHz
1odB
(400H2
307o)
90MHz
Oscilloscope
V.T.V.M.
OUT terminal
Lr, Tr,
T2 of
frontend
Adjust
for
maximum
def
lection
14
1O6MHz
106MHz
CT1, CT2,
CT3 of
frontend
15 Repeat STEPS 13
and
1
several times