Instruction manual
troubleshooting
of
many circuits
the
probe
to
the
various points and
characteristic sounds are there. The
human
ear
is
par-
the
differences
in
sound which will occur as signals
fortunate
that
the
human
is
particularly sensitive
to
small
and particularly sensitive
to
harmonics added
to
a
For
thes!! reasons
the
VARI-TRAKER can be an extremely
an oscilloscope
in
many applications.
CAPACITOR
CHECKING
I-TRAKER can be used for
detection
of
capacitors
in
circuits. When
capacitors present,
there
will be time associated with charging
of
the
possible
to
approximate
the
value
of
the
capacitor
by
count-
it
takes
to
the
capacitor until
the
sound stops
The VAR I-TRAKER
output
of
the
ARCADE ANALYZER provides an
meter,
An analog response
is
often
more
trends
(increasing
or
decreasing)
response fills this need for
For
example, con-
which calls for adjusting
to
maximum
Using
the
VARI-TRAKER simply for
the
highest frequency
of
this
type
can be achieved within 1/2%
of
the
with VARI-TRAKER
ADDITIONAL
VARI·TRAKER
APPLICATIONS
been brief
of
ways
to
use VARI-TRAKER
to
advan-
There are many more ways; there simply isn't room
to
describe.
between
60
Hz
and
400
Hz line
Trace
100
to
400
Hz audio audio circuits
Trace line
\!l'\,lt""",<
between
110
and
220V
AC
Detect Ol)eration
of
line
chopper
circuits
full wave
vs
half wave rectification
SCR control
outputs
-12-
DC
Detect
2%
ripple
on
power supply
Check power bus voltages
Use
for peaking or nulling
Monitor pulse
width
modulated
circuits
Identify voltage polarity
Check AGC circuit
operation
Detect low frequency instabilities
in
amplifiers {motor
Check
power
supply regulations
Check power supply transient response
OHMS
Fast
continuity
check test cables,
point
to
point
connections,
chassis inter-
connects, ground connections, coax wiring
Detect faulty connections
Check
pots
for wiper
contact
over full travel
Remote
contact
closure
detections
Check
potentiometer
taper
Check for brush
bounce
GENERAL
Detect
intermittent;
on volts, ohms,
or
current
by
continuities
for
Use
an
annunciator
monitor
"A-B" comparisons when
for closure, etc. Audio will appear
between and bad
Signature sound analysis
of
test points
DIODE CHECK
off
go-no go diode check
Distinguish between silicon and germanium (or
junctions
Check infra-red emitters, and optical coupler
GENERATOR OPERATION
GENERAL
The Generator section
of
the
Model 241 ARCADE ANALYZER
signals for servicing and color and black and
white
raster
X-V
monitors, The
patterns
available were selected
to
be compatible
those used
in
the
service literature provided by
the
monitor
Before beginning
to
service a
monitor,
a
copy
of
the
manufacturer'S
instructions should be consulted.
-13-