Agilent Technologies HP 8719D Service Manual page 132

Figure 3-7.
6. Adjust VCO TUNE with a non-metallic adjustment tool to 0.0 V f600 mV
(within one division of the reference line).
The adjustment is sensitive, and if out of adjustment may display au irreguhr
waveform. If so, slowly tune through the entire adjustment range to obtain a
flat trace, then carefully tune for O.OV. Once the adjustment is done, it should
be rechecked with the reference board reinshUed in the instrument, and at
operating temperature
If VCO TUNE cannot be adjusted as spe&led, and the instrument passes the
Analog Bus Correction Constants ('I&t 44) adjustment, the Al2 assembly must
be replaced.
344 Adjustments and Correction Constants
vco
vco
A d j u s t
T u n e
VCO Tune Adjustment Location
R e d