P- 2.0.4 Momentarily Between 23.0 And 28.0 Volts Dc - Fresenius Medical Care 2008K2 Troubleshooting Manual

IF (and ONLY if) REMAINS BETWEEN 3.0 and 23.0 volts
3)
1) Bad 24 volt switch (IC4)* OR 2) Bad thermal (BROWN) fuse S18
* To LOCATE IC4 AND fuse S18 refer to
fuse can be checked by measuring RESISTANCE (Ω) BETWEEN its two terminals. A good
fuse measures less than 0.5 Ω.
IF AFTER thirty seconds REMAINS between 23.0 and 28.0 volts:
4)
procedure number

P- 2.0.4 MOMENTARILY BETWEEN 23.0 AND 28.0 VOLTS DC

Turn the machine OFF!
a)
b) Swap in a known good Sensor board*. *To LOCATE the board refer to
c) Turn the machine on (fan running). When "Press CONFIRM for Service Mode" appears press
'CONFIRM'. The screen says "Machine in Service Mode".
d) Allow forty (40) seconds! Does the Main Service Program menu appear?
Yes Service menu appears! The previous Sensor board is bad. Perform all calibrations with the
new Sensor board!
No Service mode menu DOES NOT appear! One by one, with the power off, swap in the remaining
card cage circuit boards with known good, starting with the Actuator-Test Board, and repeating
parts c through d in between to test each new board. After replacing all boards if a Main Service
menu still does NOT appear proceed to
page 626
P- H.4.6 ( ).
LEFT BLANK INTENTIONALLY
2008K/K2 Troubleshooting Guide
P/N 507298 Rev. H
Figure 132 (page 651). With the machine off, the
Figure 4A
page 649
, procedure number
: TWO (2) possibilities:
See (ABOVE)
(page 9)
P- 4.0.0
Page 642