6/02
2-410
DC1632/2240
OF 1-2
Prelaunch Training/Review
Status Indicator RAPs
OF 1-2 +5 VDC
+5 VDC failure.
Procedure
Perform following:
ï Remove Rear Cover (REP 14.2).
ï Tilt out HVPS Chassis (REP 1.6).
Check that power is switched off. Measure resistance of fuse on +5V LVPS (Figure 1).
Resistance is 1 ohm or less.
YN
Replace +5V LVPS (PL 9.1).
Switch on the power. Measure the AC voltage between the black and white wires in P16 on
the +5V LVPS (Figure 1). 110 or 220 VAC is measured.
YN
Go to the AC Power RAP.
Measure the DC voltage at P511 on the +5V LVPS (Figure 1). Voltages are measured as
shown.
YN
Replace the +5V LVPS (PL 9.1).
There is a short circuit in +5 VDC distribution. Go to the +5 VDC Short Circuit RAP.
Figure 1 P16, P511 on +5V LVPS
+5VDC
RET
Vio (all)
+5VDC
Orn (3)
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