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Philips PM3208 - 5.3.24 X-gain Adjustment; 5.3.25 Triggering Adjustment; 5.3.26 Trace Starting Point Adjustment; 5.3.27 X-Y Centering Adjustment

Philips PM3208
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5
PERFORMANCE
CHECK
AND
ADJUSTMENT
PROCEDURE
5-11
5.3.24
X-gain
adjustment
TEST
EQUIPMENT
Square-wave
calibration
generator
SETTING
Channel
A
AMPL/DIV
-
0,1
V
Channel
A
coupling
-
DC
Vertical
mode
-
B
TIME/DIV
-
X
DEFL
Trigger
coupling
-
DC
Apply
a
1
kHz
square-wave
signal,
amplitude
0,5
V,
to
A.
ADJUSTMENT
Adjust
VR71
("X-G"
-
VERT
PCB)
for
an
amplitude
of
5
div.
5.3.25
Triggering
adjustment
TEST
EQUIPMENT
Function
generator
SETTING
Vertical
mode
-A
Horizontal
mode
-
MTB
TIME/DIV
-
0,2
ms
Triggering
-
AUTO
Trigger
coupling
-
DC
Trigger
level
in
centre
position
Apply
a
1
kHz
sine-wave
signal
to
channel
A
and
set
for
8
divisions,
well
centered.
ADJUSTMENT
Adjust
VR415
(HOR
PCB)
for
minimum
movement
of
the
starting
point
of
the
trace
when
switching
the
level
slope
switch
from
+
to
—
After
that,
adjust
VR413
(HOR
PCB)
for
coincidence
of
the
starting
point
of
the
trace
with
the
X-axis
of
the
graticule.
5.3.26
Trace
starting
point
adjustment
TEST
EQUIPMENT
NO
SETTING
Vertical
mode
A
Horizontal
mode
-
MTB
TIME/DIV
-
0,1
ms
Triggering
-
AUTO
Set
X
position
knob
in
centre
position.
ADJUSTMENT
Adjust
the
starting
point
of
the
trace
at
the
beginning
of
the
X-axis
of
the
graticule
by
means
of
VR805
(HOR
PCB).
5.3.27
X-Y
centering
adjustment
TEST
EQUIPMENT
NO
SETTING
Vertical
mode
-
B
Channel
A
coupling
-
DC
Channel
B
coupling
-
GND
X
position
knob
at
centre
position
TIME/DIV
-
X
DEFL
ADJUSTMENT
Adjust
VR414
("X-CENT"
-
HOR
PCB)
to
position
the
spot
at
the
centre
of
the
X-axis.
5.3
PERFORMANCE
CHECK
AND
ADJUSTMENT
PROCEDURE

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