Fresenius Medical Care 2008K Troubleshooting Manual page 255

e) Select the screen's Dialysis button to call the 'Select Concentrate' screen but
concentrate. This is No Program'.
f) Referring to Figure 110
logic board's X2 connector, pin 5 (bottom row, 3 pins from the rear of machine).
g) The measurement at pin 5 is:
Between 0 and 1.7 volts DC:
Between 1.7 and 6.0 volts DC:
HEATER RELAY- 1.0.5 CHECK THE POWER CONTROL BOARD / POWER LOGIC BOARD
a) Turn the power off and unplug the machine. Caution! High Voltage if not unplugged!
b) Referring to Figure 111
power control board. Unplug the X2 cable from the top of the power control board.
c) A bad diode 17 will damage the power logic board. Check diode 17's resistance ( )* (see
by placing the meter leads on either side of it.
d) Is the meter's numeric AND units display indicating a resistance between 500
and 1500 (or between 0.50 K and 1.5 K )?
Yes The diode is okay. See procedure number
No Replace the power control board (or diode 17 (1N914B)). The power logic board is
probably bad also (see
replacement see procedure number
* NOTE: The meter's diode check function will not work because the diode is 'in circuit'
HEATER RELAY- 1.0.6 CHECK THE POWER CONTROL BOARD / POWER LOGIC BOARD
a) Return the X2 cable to the power control board.
b) Swap in a known good power logic board (see
c) Turn the machine on and place it into Dialysis program (remember to press the 'CONFIRM' key). Does
the Heater Relay alarm reoccur?
Yes Replace the function board (see
No Problem solved! The previous power logic board is bad (IC19).
(page 253), place the TP 80 meter probe at the solder (rear) side of the power
Replace the power control board (inside the power supply). IC1 or
IC2 is bad.
See procedure number
Figure 107 – Power Logic Pin 5
(page 254) open the power supply to access the front (component) side of the
Figure 4A
Figure 4A
Figure
Fresenius 2008K Troubleshooting Guide
P/N 507298 Rev. B (Draft 1)
HEATER RELAY- 1.0.5
HEATER RELAY- 1.0.6
and NOTE B, page 8). After board or diode
HEATER RELAY- 1.0.6
and NOTE B, page 8).
4A, page 8). The previous power logic board is good.
Section 23 – Heat Relay Test Fail
do NOT
'CONFIRM' the
(page 253).
Figure 111)
(page 253).
(page 253).
Page 253