Fresenius Medical Care 2008K Troubleshooting Manual page 119

T- 4.5.0 CHECK TRIAC/POWER CONTROL BOARD
a) Electrocution Hazard! Turn the machine off and UNPLUG it.
b) Referring to the Figure (right), unplug the triac's orange wire from the
power control board's GATE connector ST 9.
c) To avoid damage wrap black tape around the triac's female (orange-
wired) connector.
d) Place the machine into Dialysis program (remember to press the
'CONFIRM' key). CAUTION! High Voltage Now Present!
e) From the Home screen, allow Temperature to fall to 40° C or less.
f) With Temperature 40° C or less, measure AC voltage (~ V) again at the distribution board's heater
connector, between the: Old style heaters: BROWN and BLUE wires; New style heaters: BLACK
and WHITE wires. Is the voltage measurement greater than 90 volts AC?
Yes a) Electrocution Hazard! Turn the machine off and UNPLUG it.
b) The triac is bad. See
ST9 to it. CAUTION! The triac's colored wires are position sensitive!
No a) Electrocution Hazard! Turn the machine off and UNPLUG it.
b) The power control board (inside the power supply) is bad. After replacement see
procedure number
T- 4.7.0 CHECK NTC #2 (TEMP CONTROL) ELECTRICAL CONNECTIONS
a) IMPORTANT! Turn the machine off.
b) Open the card cage and place a meter lead on chassis ground (see
c) Place the 274 resistor plug, from the two-resistor OLC set, into the
from the left (labeled "CON-NTC").
d) Referring to Figure 52
(rear) side of sensor board's X2 connector pin 13 (bottom row, 7 pins from
the rear of machine). Is the meter's numeric AND units display indicating
less than 300 ?
Yes See procedure number
No a) ASSURE the 274
contact with pin 13 before continuing!
b) NOTE that one (1) NTC #2 connection will be checked and proceed to page 228,
SECTION 17- CHECKING THE SENSOR BOARD
good the distribution board may be bad.
Figure 51
T- 7.0.0 (page 121).
(page 117), measure resistance ( ) at the solder
T- 8.0.0 (page 126).
resistor plug is placed correctly and that you are making good
Figure 52 – NTC #2 Checks
Fresenius 2008K Troubleshooting Guide
P/N 507298 Rev. B (Draft 1)
(page 116) OR trace the orange wire connected to
Figure
st
1
CABLE. If the sensor cable checks
Section 4 – Temperature Problems
1, page 3).
distribution board position
Page 117