T- 2.2.1 Sensor Board Pin C1 More Than 9.0 Volts - Fresenius Medical Care 2008K2 Troubleshooting Manual

T- 2.2.1 SENSOR BOARD PIN C1 MORE THAN 9.0 VOLTS

Turn the machine OFF!
a)
Set the meter to AC voltage (~ V, V
b)
known good
c) Swap in a
d) Enter Service Mode → Options → Hardware Options. Place the 'X' into the
"Yes" box and press 'CONFIRM'. The 'X' turns blue!
d) If troubleshooting a DIALYSIS PROGRAM temperature problem return to it. If a HEAT DISINFECT
problem return to HEAT DISINFECT then skip to part f.
e) From the Home screen, set [Dialysate Flow] to 500 ml/min and press 'CONFIRM'.
f) Figure right, measure again between the Heater
Connector's BROWN and BLUE wires! More than 100
volts AC now (Yes or No)?
Yes More than 100.0 volts AC! The previous Sensor
Board is bad! IMPORTANT! Return NTC #2's
connector to the
from the left, "CON-NTC".
No Less than 100.0 volts AC! The heater is still off! See parts a THROUGH c below:
Set the volt meter to measure DC voltage (V
a)
Connect the meter's black lead to chassis ground.
b)
c) Measure again at the Sensor Board's motherboard connector pin C1 (VERY front pin).
IF (and ONLY if) 3.6 volts DC or less:
1)
Sensor Board is bad but the heater off problem still exists. Proceed to
procedure number
IF more than 3.6 volts DC:
2)
Sensor Board may be good! See parts a THROUGH d below:
Turn the machine OFF!
a)
Set the volt meter to measure RESISTANCE (Ω).
b)
Parts c and d next page
)!
AC
Sensor Board (see Figure
st
1
distribution board position
T- 2.2.2.
This signal continues to be 'bad' so the previous
2008K/K2 Troubleshooting Guide
P/N 507298 Rev. H
4A, page 9).
.
DC)
This is a good signal so the previous
page 277,
Page 275