Fresenius Medical Care 2008K Troubleshooting Manual page 126

c) Proceed accordingly based on the measurement (two scenarios):
1) Greater than 90 volts: CAREFULLY return NTC#2 to distribution board position "CON-NTC" (
position from the left) then see procedure number
2) Less than 10 volts: If CERTAIN the meter is set to AC voltage (
ON, AND measuring correctly then see procedure number
T- 7.0.7 TEMPERATURE CONTROL (PART#1, TEMP CONTROL, NTC #2)
There are two parts to the Temperature Control Calibration. Part #1 = Set 'Actual' Temperature to 37° C
(NTC #2 controlled); Part #2 = Set 'Displayed' Temperature to 37° C (NTC #3). ASSURING the external
flow indicator's 'bob' is continually moving up and down:
a) If meter Temperature is not 37.0 +/-
its value can now be adjusted. K
DAC].
NOTE: Adjusting the [TEMP DAC] value by +/- 2 units increases/decreases Temperature by
approximately +/- 0.1 ° C.
b) After adjustment, press the 'CONFIRM' key. The [TEMP DAC] data box should turn pale yellow.
IMPORTANT NOTE! If the data box turns gray before meter Temperature = 37.0 +/- 0.1° C the
'CONFIRM' key was accidently pressed twice. In this event, press the 'Escape' key then return to
Calibrate Sensors
c) IMPORTANT! If a [TEMP DAC] adjustment was made, allow 8 full minutes for Temperature to stabilize.
Repeat parts a through c until the external meter stabilizes to 37.0 +/-
stable Temperature on the external meter?
Yes See procedure number
NOTE: If the [TEMP DAC] value has to be set above 180 or below 110 to achieve 37°C
this may indicate a bad NTC #2 or a bad sensor board. If the Temperature problem
reoccurs in Dialysis Program consider this.
No Proceed accordingly (three scenarios):
1. NTC #2 was already checked in THIS troubleshooting session: Replace NTC #2
(see
(page 122).
2. NTC #2 was replaced in THIS troubleshooting session: Was step
119) performed in this troubleshooting session?
Yes
No
3. NTC#2 was NEITHER replaced NOR checked in THIS troubleshooting session:
See procedure number T- 8.0.0 (page 126) to check (or replace) NTC #2.
T- 7.0.8 CHECK NTC #3 STABILITY
CAREFULLY watch the [Monitor Reference] data box for one minute. NOTE its value does NOT matter at
this time! Is it remaining stable (i.e. does not vary more than +/-
Yes See procedure number
No Replace NTC #3 (see
122).
0.1°
, activate the [TEMP DAC] data box. It turns bright yellow and
2
machines ONLY pressing the 'CONFIRM' key twice activates [TEMP
Temp Control through step #5 and repeat procedure number
T- 7.0.8 (page 124).
Figure 42, page 94) with a known good then return to procedure number
Six possibilities: 1) Bad heater (see Figure 6, page 13); 2) Bad float
switch #5 (see Figure 28, page 59); 3) Bad sensor board; 4) Bad function
board; 5) Bad distribution board.
See procedure number
T- 7.0.9 (page 125).
Figure 42, page 94) then return to procedure number
Fresenius 2008K Troubleshooting Guide
P/N 507298 Rev. B (Draft 1)
T- 7.0.7 (page 124).
~ V
T- 2.0.0 (page 104).
0.1°
T- 6.0.0 (page 119).
0.15
° C)?
Section 4 – Temperature Problems
) AND the HEATER switch is
T- 7.0.7.
C. Are you able to achieve
T- 7.0.2
T- 6.0.0 (page
T- 7.0.2 (page
Page 124
1st