Xerox WorkCentre Pro 423 Service Manual page 165

MF +12VDC POWER FIP (BSD 19.1)
Is the voltage +12 VDC between the MF MAIN PWB J300-5(+)
and GND(-)?
Y N
Is the voltage +12 VDC between the MF LVPS J507-5(+)
and GND(-)?
Y N
Is +12 VDC WIRE normal (no short circuit with the
FRAME)?
Y N
Repair the short circuit.
Is the voltage 100 VAC between the MF LVPS
J3A-4(+) and J3A-3(-)?
Y N
Is the voltage 100 VAC between the MF relay
connector J14-1(+) and J4-2(-)?
Y N
Is the voltage 100 VAC between the
POWER UNIT J1-1(+) and J1-4(-)?
Y N
Replace the POWER UNIT. (PL7.1)
Check between the POWER UNIT and
MF relay connector for an open wire or
poor contact.
Check between the MF relay connector and MF
LVPS for an open wire or poor contact.
Replace the MF LVPS. (PL7.4)
Check between the MF LVPS and MF MAIN PWB for an
open wire or poor contact.
Check between the MF MAIN PWB and the corresponding part
for an open wire or poor contact.
WorkCentre Pro 423/428
MF +5VDC POWER FIP (BSD 19.1)
Is the voltage +5 VDC between the MF MAIN PWB J300-1(+)
and GND(-)?
Y N
Is the voltage +5 VDC between the MF LVPS J507-1(+)
and GND(-)?
Y N
Is +5 VDC WIRE normal (no short circuit with the
FRAME)?
Y N
Repair the short circuit.
Is the voltage 100 VAC between the MF LVPS
J3A-4(+) and J3A-3(-)?
Y N
Is the voltage 100 VAC between the MF relay
connector J14-1(+) and J4-2(-)?
Y N
Is the voltage 100 VAC between the
POWER UNIT J1-1(+) and J1-4(-)?
Y N
Replace the POWER UNIT. (PL7.1)
Check between the POWER UNIT and MF
relay connector for an open wire or poor
contact.
Check between the MF relay connector and MF
LVPS for an open wire or poor contact.
Replace the MF LVPS. (PL7.4)
Check between the MF LVPS and MF MAIN PWB for an
open wire or poor contact.
Check between the MF MAIN PWB and the corresponding part
for an open wire or poor contact.
03/02
2-133
MF -12VDC POWER FIP (BSD 19.1)
Is the voltage -12 VDC between the MF MAIN PWB J300-6(+)
and GND(-)?
Y N
Is the voltage -12 VDC between the MF LVPS J507-6(+)
and GND(-)?
Y N
Is -12 VDC WIRE normal (no short circuit with the
FRAME)?
Y N
Repair the short circuit.
Is the voltage 100 VAC between the MF LVPS
J3A-4(+) and J3A-3(-)?
Y N
Is the voltage 100 VAC between the MF relay
connector J14-1(+) and J4-2(-)?
Y N
Is the voltage 100 VAC between the
POWER UNIT J1-1(+) and J1-4(-)?
Y N
Replace the POWER UNIT. (PL7.1)
Check between the POWER UNIT and
MF relay connector for an open wire or
poor contact.
Check between the MF relay connector and
MF LVPS for an open wire or poor contact.
Replace the MF LVPS. (PL7.4)
Check between the MF LVPS and MF MAIN PWB for
an open wire or poor contact.
Check between the MF MAIN PWB and the corresponding part
for an open wire or poor contact.
Level 2 Troubleshooting
CHAPTER 2 TROUBLESHOOTING