Fresenius Medical Care 2008K Troubleshooting Manual page 158

CO- 10.4.1 CHECK NEGATIVE (-) 12 VOLT DC SUPPLY
a) Proceed accordingly to check -12 volts DC (see Figure right):
Old style power logic board: Measure at the Converter
board at pin 4 (four pins from the left) then see part b.
New style power logic board: Measure directly at the
empty TEST connector at pin 4 (four pins from the left) then
see part b.
b) Between -11 and -13 volts DC AND stable (i.e. does NOT vary
more than +/- 0.1)?
Yes Five possibilities: 1) Bad sensor cable; 2) Bad sensor board;
3) Bad function board; 4) Bad function board; 5) Bad
distribution board.
No Proceed to page 167, procedure number
CO- 10.5.0 RETURN OLC SYSTEMS
a) Referring to Figure 309
distribution board position x13, "COND-POS".
b) CAREFULLY return post-dialyzer temperature sensor to distribution
board position x44, "NTC-POST".
c) Call debug screen 0. Referring to the Figure (right), if BOTH sensors
were placed properly the Post Dialyzer TEMP data box will read
greater than 34°C AND the Post Dialyzer COND data box greater
than 0 mS.
d) Call debug screen 5. CPRE and ACOND vary but overall do they
remain within +/-100 of each other?
Yes See procedure number
No Proceed to page 145, procedure #
CO- 10.5.1 CHECK POST DIALYZER CONDUCTIVITY
From debug screen 5, CPRE and CPOS vary but overall do they within +/- 500 of each other?
Yes See procedure number
No Proceed to page 145, procedure number
CO- 10.5.2 CHECK CONDUCTIVITY STABILITY FACTORS
OLC requires temperature, conductivity and blood pump stability. At this point, prior troubleshooting
procedures have determined that pre-dialyzer conductivity (cell #7) and Temperature (NTC #3) are stable.
a) Assure the shunt door is closed, the Bypass LED is OFF and flow through the external flow indicator.
b) From the Home screen, set Dialysate flow rate to where it is typically in your facility and clear ALL
alarms.
c) If On-Line OR Manual OLC test was performed in the last minute instability is NORMAL. In this event,
allow two minutes before continuing!
d) Call debug screen 1, if NPHT is less than 500 press and hold the "1" numeric keypad until NPHT is
greater than 600. Ignore an "On Line PHT Failed" message if it occurs.
e) IMPORTANT! ALLOW two minutes for stabilization before continuing.
f) Call debug screen 5 (see below):
(page 154), CAREFULLY return post-dialyzer conductivity cell #13 to
CO- 10.5.1
CO-
CO- 10.5.2
Fresenius 2008K Troubleshooting Guide
P/N 507298 Rev. B (Draft 1)
Section 5 – Conductivity/ On Line Clearance Problems
CR- 1.0.3.
(page 156).
6.0.0.
(page 156).
CO- 6.0.0.
Page 156