HP 54600B User, Installation And Service Manual page 119

Service
Adjusting the Oscilloscope
If the +5.1 V measurement is out of tolerance, adjust the +5.1 V adjustment
on the power supply. The ±15.75 V supplies are not adjustable and are
dependent upon the +5.1 V supply. If adjusting the power supply does not
bring all the voltages within tolerance, see "Troubleshooting the
Oscilloscope," on page 4–40.
Figure 4–2
+5.1 V adjust
Low Voltage Power Supply adjustment location
(top side of oscilloscope
4–30