To Check Power Supply Voltages - HP 54520 Series Service Manual

Warning
on
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Chapter 5: Troubleshooting
To check power supply voltages
To check power supply voltages
The power supply can be checked loaded or unloaded.
HAZARDOUS VOLTAGES!
This procedure is to be performed only by service-trained personnel who are aware of the
hazards involved (such as fire and electrical shock). Lack of awareness of the hazards could
result in electrical shock and death.
Supply Loaded
Remove the power cord and cover.
Replace the power cord and tum on the instrument.
Using the figure below, check for the voltages indicated.
Main assembly Ground Power supply Power supply
connector, P3 test point connector, P2 connector, P1
{pin 1 to rear) (pin 2 to rear) (pin 20 to rear)
\
(CZ 4
OWN 47%
ae
DRA 6:
Si 6G
3454227
Power Supply Testing Features
Supply Isolated
Isolate and check the supply with the following steps. Use the figure above for reference.
Remove the power cable.
Disconnect the supply output cable at the supply (see figure above).
Load the +5.20 V supply with a 2-ohm, 25-watt resistor. Use jumper wires to
connect one end of the resistor to any of pins 1-4, and the other end to any of pins
5-8.