Xerox DocuColor 2240 Service Manual page 539

OF 1-1 +3.3 VDC
Use this RAP to troubleshoot a failure with the +3.3 VDC.
Procedure
Perform the following:
• Remove the Rear Cover (REP 14.2).
• Tilt out the HVPS Chassis (REP 1.6).
Check that power is switched off. Measure the resistance of the fuse on the +3.3V LVPS
ure 1). The resistance is 1 ohm or less.
Y N
Replace the +3.3V LVPS (PL 9.1).
Disconnect P/J510 on the 3.3V LVPS. Switch on the power. Measure the AC voltage between
the white and black wires in P/J15A on the +3.3V LVPS
sured.
Y N
Go to OF 1-4.
Connect the black meter lead to ground. Measure the DC voltage at
LVPS (Figure 1). Voltages are measured as shown
Y N
Replace the 3.3V LVPS (PL 9.1).
There is a short circuit in +3.3 VDC distribution.
Refer to Section 7 wirenets for +3.3 VDC distribution.
Disconnect the P/J's in the distribution network. Switch the power on. Connect the P/J's while
monitoring +3.3 VDC. The +3.3 VDC supply will shut down when the P/J with the shorted cir-
cuit is connected.
+3.3
VDC
GRY (6)
Black
Wire
Figure 1 P15, P510 on +3.3V LVPS
Initial issue
DC 3535/2240/1632
(Figure 1). AC Line Voltage is mea-
P/J510 on the +3.3 V
(Figure 1).
+3.3
VDC
RET
Vio
White
Wire
OF 1-2 +5 VDC
Use this RAP to troubleshoot a failure with the +5 VDC.
Procedure
Perform the following:
• Remove the Rear Cover
• Tilt out the HVPS Chassis
(Fig- Check that power is switched off. Measure the resistance of the fuse on the +5V LVPS
1). The resistance is 1 ohm or less.
Y N
Replace the +5V LVPS (PL
Disconnect P/J511 on the +5V LVPS. Switch on the power. Measure the AC voltage between
the black and white wires in P/J16
sured.
Y N
Go to OF 1-4.
Connect the black meter lead to ground. Measure the DC voltage at
(Figure 1). Voltages are measured as shown.
Y N
Replace the +5V LVPS (PL
There is a short circuit in +5 VDC distribution.
Refer to Section 7 wirenets for +5 VDC distribution.
Disconnect the P/J's in the distribution network. Switch the power on. Connect the P/J's while
monitoring +5 VDC. The +5 VDC supply will shut down when the P/J with the shorted circuit is
connected.
Figure 1 P16, P511 on +5V LVPS
02/03
2-509
(REP 14.2).
(REP 1.6).
9.1).
on the +5V LVPS (Figure 1). AC Line Voltage is mea-
P/J511
9.1).
+5VDC
RET
+5VDC
Vio (all)
GRY
(Figure
on the +5V LVPS
Status Indicator RAPs
OF 1-1, OF 1-2