Pin 6 Less Than 9.5 Volts Dc/Isolate Power Logic Board - Fresenius Medical Care 2008T Troubleshooting Manual

T- 2.2.0 PIN 6 LESS THAN 9.5 VOLTS DC / ISOLATE POWER LOGIC BOARD
Turn the machine OFF!
a)
b) Swap in a known good Power Logic Board.
c) If troubleshooting a DIALYSIS PROGRAM temperature
problem return to it ("Select Program" → 'Dialysis' →
'Enter'). If a HEAT DISINFECT problem return to HEAT
DISINFECT.
d) Confirm your meter is set to AC voltage (~ V, V
e) Figure right, measure heater voltage again between the
Heater Connectors BROWN and BLUE wires. More
than 100 volts AC now?
Yes More than 100 volts AC! The heater is on! The previous Power Logic Board is bad.
IMPORTANT!
left, "CON-NTC".
No Less than 100 volts AC! With the new Power Logic board in the heater is still off! See parts a
THROUGH c below:
Set your volt meter to DC voltage (V
a)
b) Confirm you connect the meter's black lead to chassis ground.
c) Figure below, measure AGAIN at the Power Logic Board's X2 cable, pin 6 (TOP row, three
pins from the REAR of the machine). TWO (2) possible scenarios:
1) IF (and ONLY if) 9.5 volts DC OR MORE: This signal is good so the previous
Power Logic Board is bad but the 'heater off' problem still exists. Return to
282
2) IF less than 9.5 volts DC: The signal continues to be 'bad'! See procedure number
T- 2.2.1
AC
Return NTC #2's connector to the
, procedure number T- 2.0.1 to check other relevant signals.
(page 293).
2008T Troubleshooting Guide
P/N 490292 Rev. A
).
st
1
distribution board position from the
).
DC
page
Page 292