Fresenius Medical Care 2008K Troubleshooting Manual page 118

d) Referring to Figure 51
BETWEEN connectors ST 8 and ST 11. Do NOT use TP 80!
e) Is the meter's numeric AND units display indicating greater than 3 Million ohms
NOTE!
(i.e. 3 (
Yes See procedure number
No a) Return NTC #2 to distribution board position "CON-NTC" (
b) The triac is bad. See
connected to ST 8 and ST 11 to it. IMPORTANT! The triac's colored wires are position
sensitive!
Figure 51 – Solder Side Power Control Board / Triac Wiring
T- 4.4.0 CHECK TEMP DISPLAY CALIBRATION
NOTE: The 'Temp Comp' option (Service Mode
"No" = blue) to perform this procedure otherwise the required [TEMP DAC] data box will not be available.
'Temp Comp', if required, can be reactivated when troubleshooting is complete.
a) Place the machine into Service Mode
b) Select the screen's [TEMP DAC] data box. It turns bright yellow. K
'CONFIRM' key twice activates [TEMP DAC].
c) NOTE the current value in the [TEMP DAC] window.
d) Set the [TEMP DAC] data box to "20" then press the 'CONFIRM' key (the window turns pale yellow). This
should turn the heater off if the electronics are working properly.
e) Do NOT use TP80 for the subsequent AC voltage measurement!
IMPORTANT
!
f) Allow the screen's [Monitor Reference] data box drop to 40° C or less.
With [Monitor Reference] less than 40° C
g)
heater connector between the: Old style heaters: BROWN and BLUE wires; New style heaters:
BLACK and WHITE wires. Is the measurement greater than 90 volts AC?
Yes See procedure number
No The Temperature calibration is WAY out. Set the [TEMP DAC] window to 50 less than
what was noted above. Press the 'CONFIRM
see procedure number
(page 116), measure resistance ( ) at the solder (back) side of the board
"OL" is MUCH greater than 3 M )?
T- 4.4.0 (page 116).
Figure 51
Calibrate Sensors
T- 4.5.0 (page 117).
T- 7.0.0 (page 121).
Fresenius 2008K Troubleshooting Guide
P/N 507298 Rev. B (Draft 1)
(page 116) OR trace the brown and blue wires
Options Hardware Options) must be turned off (i.e.
Temperature Control.
2
machines ONLY pressing the
, measure AC voltage (~ V) at the distribution board's
'
key twice to save the calibration then
Section 4 – Temperature Problems
st
1
position from the left).
Page 116