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Model8565A
Adjustments
ADJUSTMENTS
5·13.
HIGH VOlTAGE POWER SUPPlY ADJUSTMENT (Cont'd)
PROCEDURE:
WARNING
I
After disconnecting AC line power cord, allow a minimum of 30 seconds
for High Voltage Power Supply to discharge before removing High
Voltage Power Supply protective cover.
a.
Set LINE switch OFF, disconnect power cord, and remove 8565A top and bottom covers. Remove
High Voltage Power Supply protective cover. Connect equipment as shown in Figure 5-3.
b.
Reconnect power cord, set LINE switch ON, and set 8565A controls as follows:
Set all Normal Settings (controls marked with green)
INPUT ATTEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 dB
REFERENCE LEVEL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 dBm
AMPLITUDE SCALE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LIN
CONVentional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Depressed
PERSIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fully counterclockwise
-pocus-...... --............. - ...... - . ......
~-
....... -...... - - . . -
Midrange
INTENSITY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dim CRT trace
High Voltage Power Supply
c.
Calibrate High Voltage probe as follows:
1.
Measure output of+ 158V supply at A40A2TP10 and note reading.
+ _ _ _ _ Vdc
2.
Connect 1000:1 divider probe to digital voltmeter and set voltmeter to .1 V range.
3.
Measure + 158V supply through 1000:1 divider probe and note reading.
+ _ _ _ _ Vdc
4.
Divide reading noted- in step c-1 into reading noted in step c-3. This gives the calibration
factor of the high voltage probe.
WARNING
I
High voltage is present at the following test point.
d.
Set digital voltmeter to lOV range and measure output of high voltage CRT cathode power
supply on board assembly A8 HVTP (TPl).
e.
Adjust A9R2 HV (Figure 5-4) for a reading equal to the calibration factor, calculated in step
c-4 times -3000 volts.
'
Focus Centering
f.
Depress both INT and EXT SWEEP SOURCE pushbuttons to produce a dot on the CRT screen.
ERRATA APRIL 6, 1978
5-19
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