Isolate Temperature Control; Isolate Ntc #2 - Fresenius Medical Care 2008T Troubleshooting Manual

T- 1.3.40 ISOLATE TEMPERATURE CONTROL
a) Figure right, place the
KΩ) plug, from the
FOUR-
RESISTOR SET
distribution board position from the left,
"CON-NTC".
Set your volt meter to AC voltage (~ V, V
b)
Turn the HEATER Switch ON!
c)
d) Figure right, measure at the distribution board's Heater
Connector, BETWEEN the BLUE and BROWN wires.
TWO (2) possible scenarios:
1)
IF (and ONLY if) 100.0 volts AC or more:
Leaving the 90° C plug installed, proceed to
page 306
, procedure number
2) IF LESS THAN 10.0 volts AC: ENSURING the HEATER Switch was on AND the meter was set to
AC voltage
prior to measuring, see procedure number
T- 1.3.60 ISOLATE NTC #2
a) Call the Home screen to see the machine's [Temperature] display.
o
b) Remove the 90 C plug from distribution board position, "CON-NTC".
c) LEAVING "CON-NTC" VACANT, allow [Temperature] to increase to more than 38.0° C BEFORE
continuing to part d!
Set [Dialysate Flow] to "OFF" and press
d)
'Enter'!
e) Figure right, avoiding VACANT position #4, plug NTC
#2's connector, into NTC #3's position,
from left, "MON-NTC". Leave NTC #3 unplugged!
f) Call debug screen 4 to see TEMP (lower
left). TWO (2) possible scenarios:
1) IF (and ONLY if) TEMP is more than 3.0: See procedure number
2) IF TEMP is less than 3.0: See parts A and B below:
A) Replace NTC#2* it with a known good. *To LOCATE NTC #2 refer to
B) See procedure number
90° C
(0.915
st
1
into the
T- 4.0.0.
nd
2
position
236).
T- 1.3.70
2008T Troubleshooting Guide
P/N 490292 Rev. A
)!
AC
T- 1.3.60
(page 260).
(page 259).
T- 1.3.70 (page 260).
Figure 42 (page
Page 259