Cr- 1.0.9 Isolating Negative (-) Twelve Volts; Cr- 1.0.10 Negative 12 Volts Not Within Range - Fresenius Medical Care 2008K2 Troubleshooting Manual

CR- 1.0.9 ISOLATING NEGATIVE (-) TWELVE VOLTS

IMPORTANT! To avoid damage turn the machine OFF!
a)
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 then re-measure -12 volts as this
may be the problem!
IMPORTANT!
c) Unplug the
IMPORTANT! Turn the machine on (fan running)!
d)
ENSURE the meter's black lead REMAINS connected to ground!
e)
f) Repeat the measurement at TEST Connector's -12V pin (pin 4, four pins from left). 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.
No NOT between -11.0 and -13.0 DC! See procedure number

CR- 1.0.10 NEGATIVE 12 VOLTS NOT WITHIN RANGE

IMPORTANT!
a) To avoid damage turn the machine off THEN allow two (2) full minutes!
IMPORTANT! Set your volt meter to measure resistance (Ω)!
b)
c) ENSURE the meter's black lead REMAINS connected to ground!
Parts d and e next page
Blood Pressure
module.
2008K/K2 Troubleshooting Guide
P/N 507298 Rev. H
CR- 1.0.10 (page 407).
Page 407