M126/M127/M128 6-54 SM
FRU Action
LVPS/HVPS
Verify main power to engine board
With the machine off, unplug the LPS/HVPS cable at J502
on the controller board. Verify grounds on pins 10, 12, 14,
16 and 18 for both the cable and the engine board. If any of
these grounds are incorrect, then check the cable for
continuity. If the cable fails continuity, then call the next
level of support.
Turn the machine on with the cable still unplugged, and
verify the following on the cable (engine board will not be
powered):
6, 17, 19 (Pins): +24Vdc
1, 3-5, 7, 11, 13, 15 (Pins): +5Vdc
If any of the voltages are incorrect, then replace the
LVPS/HVPS (
p.6-57 "Dead Machine Service Check").
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