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4. Final Display Adjustments (SN 3001A and Below)
4. Final Display
Adjustments (SN
3001A and Below)
Reference
Description
Note
Procedure
Note
AlAl
Keyboard
AlA
Z Axis Amplifier
AlA
X Deflection Amplifier
AlA
Y Deflection Amplifier
This procedure is used to optimize the appearance of the CRT display
during routine maintenance or after CRT replacement or minor
repairs. First, the display is adjusted for best focus over the full CRT,
then the graticule pattern is adjusted for optimum rectangular display.
Adjustment Procedure 2, High Voltage Adjustment (SN
3001A
and
Below) should be performed prior to performing the following
adjustment procedure.
1. With the spectrum analyzer LINE switch set to STANDBY, set the
potentiometers listed in
lhble
3-5 as indicated. See Figure 3-30 for
the location of the adjustments.
In this procedure, do not adjust the following potentiometers and
precision variable capacitors on the
AlA
Z-Axis Amplifier,
AlA
X-Axis Amplifier, or
AlA
Y-Axis Amplifier Assemblies: AlA2R36
INT LIMIT, AlA2R22 HF GAIN, AlABClO, AlA4R28 HF GAIN,
AlA4C10,
AlA4Cl1,
AlA5R28 HF GAIN, AlA5C10, or
AlA5Cll.
These components are adjusted in Adjustment Procedure 2, High
Voltage Adjustments (SN
3001A
and Below) and Adjustment Procedure
3, Preliminary Display Adjustments (SN
3001A
and Below).
‘Ihble
3-5. Initial Adjustment Positions
Adjustment
Position
Front-panel INTENSITY fully clockwise
Front-panel FOCUS centered
Front-panel ALIGN centered
AlA2R5 INT GAIN fully clockwise
2. Set the LINE switch to ON and wait at least 5 minutes to allow the
CRT and high-voltage circuits to warm up. The spectrum analyzer
power-up annotation should be visible on the CRT display.
3. For an initial coarse focus adjustment, adjust
AlA3R15
FOCUS
LIMIT, AlA2R36 ASTIG, and AlA2R30 FOCUS GAIN in sequence
for best displayed results.
4. Adjust
AlA4R7
X POSN, AlA4R27 X GAIN,
AlA5R7
Y POSN, and
AlA5R27 Y GAIN for optimum centering of the display annotation
and graticule pattern.
Adjustments 3-59