Fresenius Medical Care 2008K Troubleshooting Manual page 116

T- 3.0.6 CHECK NTC #2
a) Referring to the Figure (right), unplug the connector at the
distribution position from the left (labeled "CON-NTC"). This is
temperature controls sensor NTC #2.
b) Continue to CAREFULLY watch the external meter for 20
minutes. Do NOT let Temperature exceed 90° C! Does the
meter's temperature reading reach 80° C or greater?
Yes a) Return NTC #2's connector to the
position from the left, labeled "CON-NTC".
b) See procedure number T- 7.0.0 (page 121).
No Replace the heater.
T- 4.0.0 CHECK TEMPERATURE CONTROL (NTC #2)
a) Referring to the Figure (above, right), CAREFULLY place* the
the four-resistor Temperature set, into the
NTC"). IMPORTANT! Leave the resistor plug in until instructed otherwise!
* It may have already been placed from a previous procedure!
b) Open the card cage and place a volt meter's ground (black) lead onto chassis ground (see
page 3).
c) Referring to Figure 49
horizontally, turns 90 degrees downward, and connects to the motherboard. This is the "C row",
numbered 1 through 32 (from front-to-rear).
d) Using a regular meter probe (do NOT use Fluke TP 80), CAREFULLY measure DC volts at pin C1
(very FRONT motherboard pin). Proceed accordingly:
9.6 or greater: See procedure number
Between 3.7 and 9.5: Assure you are not contacting adjacent pin C2.
Less than 3.6:
1
st
1
(page 114), at the bottom of the SENSOR board a row of pins extend
T- 4.1.0
o
a) ASSURE the 80 C plug is placed correctly before continuing! If not
repeat T- 4.0.0 (page 114).
b) See procedure number
Figure 49 – Sensor Board / Pin C1
Fresenius 2008K Troubleshooting Guide
P/N 507298 Rev. B (Draft 1)
st
1
st
distribution
o
80 C
distribution board position from the left (labeled "CON-
(page 115).
T- 4.7.0 (page 117).
Section 4 – Temperature Problems
(1.255 K ), resistor plug from
Figure
Page 114
1,