Fresenius Medical Care 2008K Troubleshooting Manual page 120

T- 5.0.0 CHECK TEMP (SCREEN 4)
Call debug screen 4. Is TEMP = less than
Yes See procedure number
No See procedure number
T- 5.0.1 CHECK NTC #3 POSITION RESISTANCE
a) IMPORTANT! Turn the machine off.
b) Open the card cage and place a meter lead on chassis ground
(see Figure 1, page 3).
c) Referring to the Figure (right), place the 274
the two-resistor OLC set, into the
from the left (labeled "MON-NTC"). ASSURE the resistor plug
is placed correctly before continuing!
d) Touch the ohm ( ) meter's leads together and subtract this resistance reading from subsequent
resistance ( ) readings!
e) Referring to Figure 53
solder (rear) side of sensor board's X2 connector pin 12 (top row, 6 pins from
rear of machine). Is the meter's numeric AND units display indicating less than
300 ?
Yes a) Return the 6.04 K
board position from the left (labeled "MON-NTC"). ASSURE the resistor plug is placed
correctly before continuing!
b) Return to Dialysis program (remember to press the 'CONFIRM' key) then see procedure
number
No a) ASSURE the 274
pin 12 before continuing!
b) NOTE that NTC #3's connection will be checked and proceed to page 228,
17 - CHECKING THE SENSOR BOARD
distribution board may be bad.
0.5
?
T- 5.0.1 (page 118).
T- 5.0.2 (page 144).
2nd
distribution board position
(page 118), CAREFULLY measure resistance at the
resistor plug, from the two-resistor OLC set, into the
T- 5.0.2 (page 144).
resistor is placed correctly and that you are making good contact with
Figure 53 – NTC #3 Checks
Fresenius 2008K Troubleshooting Guide
P/N 507298 Rev. B (Draft 1)
resistor plug, from
CABLE. If the sensor cable checks okay the
Section 4 – Temperature Problems
nd
2
distribution
SECTION
Page 118