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IBM Infoprint 1130/1140
FRU
6
LVPS
7
System Board
2-52
Service Manual
Action
Remove the LVPS from the printer.
CAUTION: Before making any
measurements on the LVPS output
connector (CN3), observe all
necessary safety precautions before
applying AC power. Measure the
voltage on CN3-1, 2, 10 or 11. The
voltage measures approximately
+5V dc. If incorrect replace the
LVPS.
Turn the printer off and disconnect
all the cables from the system board.
Check for +5V dc at the system
board test point. If incorrect replace
the FRU in the order shown.
interconnect board
system board
If correct, turn the printer off and
reconnect one cable at a time until
you find the defective assembly.
Service Tip: A short or low
resistance load that is attached to
the system board can pull the +5V
dc supply down to approximately
0 V dc.
Check for burn marks or other signs
of damage to the system board.
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