3. TEST EOUIPMENT REOUIRED FOR SERVICING
Item
Use
AM
Signal Generator
Signal source
for
AM
alignment
Test
Loop
Use
with
AM
signal generator
FM Signal Generator
Signal source
for
FM alignment
MPX Signal Generator
Stereo separation alignment and
trouble
shooting
Distortion
Analyzer
Distortion
measurements
Audio
Oscillator
Sinewave and squarewave signal source
ACVTVM
Voltage measurements (AC)
Oscilloscope
Waveform analysis and
trouble
shooting and ASO alignment
Frequency
Counter
MPX
oscillator adjustment (VCO)
Circuit
Tester
Trouble
shooting
DCVTVM
Voltage measurements (OC)
AC
Wattmeter
Monitors
primary
power
to
tuner
Line
Voltmeter
Monitors
potential
of
primary
power
to
tuner
Variable
Autotransformer
(0 ~
140V
AC,
10A)
Adjusts level
of
primary
power
to
tuner
4. TUNER ALIGNMENT PROCEDURES
A
dummy
resistor
of
47
kohms must
be
connected across the tuner
output
terminais before alignment.
4.1
FM
Alignment
Procedures
(Function
switch in the
"FM"
position,
MODE
switch in the
MONO
position.)
1.
FMRFAiignment
Step
Signal Source
Signal
lndicator
Set
the
Digital
Adjust:
Connection
Frequency
Connection
Readout
Frequency
FM
signal generator
to
FM
antenna
terminal
(300nl
through
matching
network
VTVM
to
Lor
R
FRONT
END
IFT(L8)for
1
Set
the
SG
RF
output
98
.
00
MHz
chnnel
output
98
.
00
MHz
maximum
output
and
level so
that
sorne noise
can be observed on
the
(J102)
minimum
distortion.
upper
and lovver side
of
the
output
waveform
.
FM
signal generator 1
mV
output
to
FM
antenna
"0
" center
meter
terminal
(300nl
through
or
OC
current
meter
L201
(Primary)
core
so
2
matching
network
98
.
00
MHz
in
100
1-1A
range
98
.
00
MHz
th
at the
meter
ind
ica tes
its
Modulation
Level
between
center
or
may
read
"0"
.
DIN
40kHz
DEV
.
(J201,
J202)
IHF
75kHz
OEV
.
FM
signal generator 1
mV
Distortion
meter
to
L201 (Secondary)
core
3
output
to
FM
antenna
98
.
00
MHz
L
or
R channel
output
98
.
00
MHz
for
minimum
distortion
.
terminal
(300n)
through
matching
network.
(J102)
2
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