Leader LTC-905 - Power Supply Calibration; Staircase Generator Calibration

2)
Power
Supply
a)
Connect
DC
voltmeter
between
the
test
point
and
chassis.
b)
Check
the
voltage
according
to
Table-1
Test
point
Voltage
Tolerance
D106
+
5V
+4.5V
to
+5.5V
D105
+
9V
+
8.2V
to
+10.
5V
D107
-9V
-8.2V
to
-10.5V
Table-1
3)
Staircase
Generator
a)
0
Level
Adjustment
o
Connect
the
DC
oscilloscope
to
BASE/
GATE
jack.
o
Adjust
STEP
0
ADJ
(VR101)
for
minimum
base
line
shift
when
POLARITY
is
switched
between
NPN
and
PNP as
shown
in
Figure-1
line=0V
Figure
-1
b)
Amplitude
Adjustment
o
Connect
the
oscilloscope
to
BASE/GATE
jack.
o
Adjust
NPN
STEP
ADJ
(VR102) for
amplitude
of
3.5Vp-p
with
seven
steps
as
shown
in
Figure-2.
Figure-2
-3-
LTC-905