Adjustment Procedure—2465B/2467B Service
2467B
CRT ADJUSTMENTS
NOTE
The blue CRT shield must be removed before performing CAL 08.
Equipment Required (see Table 4-1)
Leveled Sine-Wave Generator (Item 2) Oscilloscope with 10X probe (Item 7)
50 fi BNC Cable (Item 10) Digital Multimeter (DMM)
Alignment Tool (Item 20)
See ADJUSTMENT LOCATIONS 2 and ADJUSTMENT LOCATIONS 4
at the back of this manual for test point and adjustment locations.
NOTE
When performing the following automatic cal steps,
initial setting of the front-panel controls is not
required.
1.
Adjust Z-AXIS DRIVE (MAX GRID DRIVE-R949)
a. Simultaneously press in and hold the At and the AV
push buttons, then press and hold the SLOPE button.
Hold all three buttons in for approximately one second,
then release them.
b. CHECK—Top line of the readout display says:
DIAGNSTIC. PUSH A/B TRIG TO EXIT".
NOTE
The "menu" of calibration,
test,
and exercise rou-
tines are in a loop that may be scrolled through in
single steps, either forward or backward. Pressing
the upper or lower TRIGGER MODE push buttons
respectively increments or decrements the menu
posit/on by one. As each routine is selected, its
name appears in the lower left corner of the readout
display.
c. Scroll to CAL 08.
NOTE
In this procedure, pressing the upper TRIGGER
COUPLING button increments the routine to the
next step. Pressing the lower TRIGGER COUPLING
button will return to the previous step.
d.
Press and release the upper TRIGGER COUPLING
button to initiate the routine.
e. Connect the bench scope through 10X probe to J191
pin 9 (main board). Set bench scope volts/div to 10 V and
SEC/DIV to 1 us.
NOTE
The Bench Scope display will be a combination of
Trace and Readout unblanking pulses. The higher
amplitude pulses are the Trace unblanking pulse.
This pulse is the one the following adjustment refers
to.
To facilitate triggering, the Bench Scope trigger
level should be adjusted to slightly less than 40 V. If
the displayed pulse amplitude is much less than
approximately 40 V, adjustment of the Bench Scope
trigger level may be necessary.
f. ADJUST—Z-Axis Drive (R949) for peak-to-peak
pulse amplitude of +40 V.
NOTE
Exclude the first 0.5 division of the pulse when
adjusting peak-to-peak amplitude.
g.
ADJUST—A control to set Max Grid Drive (in lower
readout row) to 40 V.
h. Press and release the upper TRIGGER COUPLING
button to advance to the next step.
5-4
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