Turn-On Checkout; Preliminary Checkout; Series 657Xa Power Supplies - HP 654 A Series Operating Manual

TURN-ON CHECKOUT
Note
This chapter provides a preliminary introduction to the power supply front
panel. See Chapter 5 for more details.
INTRODUCTION
Successful tests in this chapter provide a high degree of confidence that the power supply is
operating properly. For complete performance and/or verification tests, refer to the service
manual (see Table 1-4 in Chapter 1).
Caution
Do not connect the power cord to the power source until told to do so.
PRELIMINARY CHECKOUT
Series 654xA and 655xA Power Supplies
If required, see Figure 2-1 in Chapter 2 and Figure 4-1 in Chapter 4 for parts locations.
1. Make certain that the front panel switch is off.
2. Examine the Line And Fuse Rating label (3, Figure 2-1);.
a. Verify that the line voltage rating agrees with your power source. If it does not, see
Appendix B.
b. Use a screwdrive to remove the line fuse from the fuseholder (1, Figure 2-1). Verify that
the fuse is as specified on the label. Replace the fuse.
3. Check that the SENSE switch (4, Figure 4-1) is set to Local
4. Make sure that there is no load connected to the output (-f-) and (-) terminals (2, Figure
Series 657xA Power Supplies
1. Examine the Line Voltage label (4, Figure 2-2) and verify that the line voltage rating
agrees with your power source. If it does not, see Appendix B.
2. Remove the output safety cover (1, Figure 4-2).
3. Examine the output sense terminals (4 and 5, Figure 4-2). They should be wired for local
sensing as follows:
a. The -fLS sense terminal wired to the -fS terminal of the analog connector (2, Figure
4-2).
b. The -LS sense terminal wired to the -S terminal of the analog connector.
c. If the power supply is not wired for local sensing, make the above connections, using
small-capacity wire (#22 is sufficient).
4. Make certain there is no load connected to the bus bars.
Introduction Turn-On Checkout 3-1