2008T Troubleshooting Guide
P/N 490292 Rev. A
CR- 1.0.9 ISOLATING NEGATIVE (-) TWELVE VOLTS
a) To avoid damage turn the machine OFF!
b) Figure below, at the rear of the card cage, ENSURE the Blood Pressure Module cable, is NOT reverse
connected with another module! If it is, correct this situation and re-measure -12 volts as this may
be the problem!
c) Unplug the
Blood Pressure module from the card cage.
d)
Turn the machine ON (fan running)!
e) Remeasure -12V at the EXTENDER board. Between -11.0 and -13.0 volts DC now?
Yes Between -11.0 and -13.0 DC! The Blood Pressure module OR its cable may be bad OR a
wrong module was plugged in originally.
No NOT between -11.0 and -13.0 DC! See procedure number CR- 1.0.10 (page 451).
CR- 1.0.10 NEGATIVE 12 VOLTS NOT WITHIN RANGE
a) Replace the Power Logic board
with a known good then see part b. To LOCATE the Power Logic board
refer to Figure 4A (page 10).
b) Remeasure -12V at the EXTENDER board.
If still NOT between -11.0 and -13.0 volts DC see part c.
c) Possible -12 volt short! Except for the Power Logic and UI-MICS boards the other cage boards can be
isolated by pulling them out, one at a time and repeating the -12V measurement in between. If still NOT
between -11.0 and -13.0 volts see part d.
d) Possible bad UI-MICS board. Swap in with a known good and repeat the -12V measurement. If still
NOT between -11.0 and -13.0 volts possible bad motherboard.
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