T- 8.0.0 Isolate Ntc #2 - Fresenius Medical Care 2008K2 Troubleshooting Manual

T- 8.0.0 ISOLATE NTC #2

This procedure checks NTC #2 resistance (Ω) response. An accurate thermometer is required. If one is not
available replace NTC #2 (see
number T- 7.2.1 (page 305).
IMPORTANT! Turn the machine OFF!
a)
b) Per the Figure below, unplug NTC #2's connector from the
c) CAREFULLY (thin wires!) open NTC #2's female distribution board connector.
d) Referring to the Figure above, remove NTC #2 from the hydrochamber to expose its 'probe end'. Do
NOT lose the O-ring!
e) If (and ONLY if) NTC #2 appears 'rusty' replace it then return to (ABOVE)
procedure number T- 7.2.1
f) Clean with paper towel. Do not touch it from this point forward to avoid
fouling it!
g) Fill a Styrofoam cup with water, accurately measured, between 36 and 38
h) Per the Figure (right), drop NTC #2's 'probe end' into the cup.
i) Per the Figure right, measure RESISTANCE (Ω) between the
connector's green and white wires. Referring to
between the minimum and maximum (KΩ) range?
Yes Return to (ABOVE) procedure number
305).
No Replace NTC #2 with a tested known good then return to
(ABOVE) procedure number
Figure 54, page 315) with a known good then return to (ABOVE) procedure
Figure 54 – Hydraulics Rear View – NTC #2
(page 305). If NOT rusty continue to part f.
T- 7.2.1
2008K/K2 Troubleshooting Guide
P/N 507298 Rev. H
st
1
position from the left, labeled "CON-NTC".
Table 6 (page 316),
T- 7.2.1 (page
(page 305).
o
C!
Page 315