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3. Preliminary
Display
Adjustments (SN
3004A and Above)
Reference
AlAl
Keyboard
Al
A2
X,
Y,
Z Axis Amplifier
Note
Adjustment Procedure 2, “High-Voltage Adjustment,” should be
performed before performing the following adjustment procedure.
Note
Perform this adjustment only if components have been replaced on
the
AlA
X, Y, Z Axis Amplifier Assembly. Components
R117,
R217,
R308,
C104,
C109,
C204,
C209,
and
C307
are factory adjusted and
normally do not require readjustment. Components affecting these
adjustments are located in function blocks
F,
H, M, N, 0, P, R, and S
of the
AlA
X, Y, Z Axis Amplifier Assembly schematic diagram.
Description
The X, Y, Z Axis Amplifier Assembly is adjusted to compensate the
CRT drive circuits for proper horizontal and vertical characteristics.
These preliminary adjustments are necessary only after replacement
or repair of the
AlA
X,
Y,
Z Axis Amplifier Assembly). For routine
maintenance, CRT replacement, or minor repairs, only Adjustment
Procedure 4, “Final Display Adjustments,” needs to be performed.
Caution
Be sure not to allow a fixed spot of high intensity to remain on the
spectrum analyzer CRT. A high intensity spot may permanently
damage the CRT’s phosphor coating. Monitor the CRT closely during
the following adjustment procedures. If a spot occurs, move it
off-screen by adjusting either the front-panel INTENSITY control, or
the horizontal or vertical deflection position controls.
Equipment
Digitizing Oscilloscope
....................................
HP
54501A
Pulse/Function Generator
..................................HP
8116A
10:1 Divider Probe, 10
MW7.5
pF,
(2
required)
...........HP
10432A
Display Adjustment PC Board (service accessory)
......
.85662-60088
Termination, BNC 500
....................................
HP
11593A
Adapters:
Adapter, BNC(f) to
SMB(f)
. . . . . . . . . . . . . . . . . . . . . . . .1250-1236
Adapter, BNC tee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.1250-0781
3-52 Adjustments