Adjusting Power Supply B (+12 Vdc/-12 Vdc) - Sun Microsystems StorEdge A7000 Service Manual

9. At the on/off switch assembly, remove the connector from pin 6 and replace it on
pin 4.
Both supplies are now powered on. The DVM reading should now be between 5.04
and 5.06 VDC.
10. Disconnect the DVM leads from the power bus bars.
11. Repeat the steps in this section for the DSP2 power supplies in the right tray.
6.12.3

Adjusting Power Supply B (+12 VDC/-12 VDC)

Caution – High voltage is present during these procedures—use a nonconductive
insulated adjustment Phillips screwdriver to make the power supply adjustments.
1. Power on the cabinet supplies by pressing the cabinet power switch, shown in
FIGURE 6-20
2. Power on the subsystem power supplies by sliding the power supply switch to
the right (you may have to tilt the tray up to access the switch).
3. Connect the DVM leads to the +12 VDC and GND lugs on the power supply B's
chassis backplane. See
4. Using a nonconductive insulated adjustment Philips screwdriver, turn pot V2 on
the power supply until the DVM displays +12.0 VDC.
5. Connect the DVM leads to the -12 VDC and GND lugs on the chassis backplane.
See
FIGURE 6-19
6. Using a nonconductive insulated adjustment Philips screwdriver, turn pot V3 on
the power supply until the DVM displays -12.0 VDC.
7. Remove the DVM leads.
.
FIGURE 6-19
.
.
Chapter 6 FRU Removal and Replacement 6-49