To Check The Low Voltage Power Supply - HP 54600B User, Installation And Service Manual

To check the Low Voltage Power Supply

Disconnect the power cord, then set the oscilloscope on its side.
1
Connect the negative lead of the multimeter to a ground point on the
2
oscilloscope. Connect the power cord and turn on the oscilloscope.
Measure the power supply voltages at L1, L2, and L3 on the system
3
board.
Table 4-19 Power Supply Voltage Tolerances
Supply Voltage
+5.1 V
+15.75 V
−15.75 V
Figure 4–7
Low Voltage Power Supply voltage test points
If the +5.1 V measurement is out of the test limits, adjust the +5.1 V
adjustment on the power supply. The ±15 V supplies are not adjustable and
are dependent upon the +5.1 V supply.
Blown fuse
If the fuse is blown in the power supply, the power supply is defective. Replace
the power supply.
Troubleshooting the Oscilloscope
Tolerance
±150 mV (+4.95 V to + 5.25 V)
±787 mV (+14.96 V to +16.54 V)
±787 mV (−14.96 V to −16.54 V)
Service
4–45