HP PL4260N Service Manual page 158

(4) Y set-up voltage waveform adjustment.
Turn the VR3 on Y SUS B/D so that Vsp voltage A of
(Fig. 2) be 150 1V.
(5) Y set-down voltage waveform adjustment.
Turn the VR2(Set _dn_Vy)on Y SUS B/D so that
waveform A of (Fig. 2) be 10 5 .
3. How to adjust Z SUS (Adjustment should be done
after setting Vs/Va to the set voltage)
(1) Vzb(Z bias) voltage adjustment.
For the Vzb voltage, measure and adjust the voltage
between the frame GND and Vzbias point(Q18 Drain)
in left side on Z SUS B/D.
Turn the variable resistor of Vzb DD_Pack(PS101) on
Z SUS B/D to set to 100 ±0.5V.
(Fig. 2) Y set-up Waveform