Adjustment Procedure-2445A/2455A Service
POWER SUPPLIES
Equipment Required (see Table 4-1)
Oscilloscope With 1
OX
Probe (Item
7)
Digital Multimeter (Item
19)
See ADJUSTMENT LOCATIONS 1
Alignment Tool (Item
20)
1X
Probe (Item
21)
and ADJUSTMENT LOCATIONS 4
at
the back
of
this manual for test
point
and adjustment locations.
NOTE
If
the instrument displays "DIAGNST/C. PUSH
A/8
TRIG
TO
EXIT"
at
power-on, one
of
the power-up
tests has failed.
If
the error message
on
the bottom
line
of
the display is "TEST 04 FAIL
xx"
where
"xx"
is
01,
10
or
11,
stored calibration data is in error,
and the instrument should
be recalibrated.
If
this is
the case, pressing the
A/B
TRIG button will force
entry to the normal operating mode; however, the
accuracy
of
any measurement taken could be in
error.
If
any
other error message occurs, the failure
is
prob-
ably not related to calibration.
In
this
case,
the instrument
should
be
repaired before attempting calibration.
INll"IAL
CON"rROL
SETTINGS
Controls settings not listed will not affect the procedure.
VERTICAL
CH
2 VOL TS/DIV
CH
3
and
CH
4
VOLTS/DIV
CH
1
and
CH
2
VAR
CH
1
and
CH
2
Input Coupling
CH
1
CH
2,
CH
3,
and
CH
4
ADD,
INVERT,
and
BW
LIMIT
ALT/CHOP
POSITION
5-2
100
mV
.1
V
In
detent
1
MO
DC
On
Off
Off
ALT
Midrange
HORIZONTAL
SEC/DIV
SEC/DIV
VAR
POSITION
TRIGGER
MODE
SOURCE
COUPLING
SLOPE
LEVEL
HOLDOFF
Delta
tN
and
~t
Display
X-Y
(knob
in)
In
detent
Midrange
AUTO LVL
VERT
DC
+ (plus)
Midrange
In
detent
Off (press
and
release
until readout display
disappears)
INTENSITY Visible display
READOUT INTENSITY Visible display
(CCW
from MIN)
SCALE ILLUM
Fully
CCW
FOCUS
Defocused dot
1.
Check/ Adjust Power Supply
DC
Levels,
Regulation, and Ripple (R1292).
a.
Connect the Digital Multimeter (DMM) negative
lead
to chassis ground. Connect the positive
lead
to the first
test point listed
in
Table
5-1
(all
test points are on the
Main Board).
b.
CHECK-
That the reading
is
within the limits given
in
Table
5-1.
c.
ADJUST-Volt
Ref
Adj (R1292) for a DMM reading
of precisely 10.00
V.
The
adjustment is accessible
through a hole
in
the top cover plate.
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