P- F.5.0 Isolate +24V-A - Fresenius Medical Care 2008K2 Troubleshooting Manual

Yes BOTH more than 23.0 volts! Proceed to page
No BOTH are less than 23.0 volts! TWO (2) possible scenarios:
1) IF (and ONLY if) BOTH are less than 23.0 volts: See procedure number
(page 605).
2) IF AT LEAST one is more than 23.0 volts: The Power Logic X2 ribbon cable may be bad.

P- F.5.0 ISOLATE +24V-A

a) Spread the card cage side panels open then gently drop the front panel down to access the
motherboard's nine (9) pin TEST Connector.
b) ENSURE the machine is on (fan running)!
c) ENSURE the meter's black lead REMAINS connected to chassis ground!
Per the Figure below
d)
More than 23.0 volts DC (Yes or No)?
Yes More than 23.0 volts DC! TWO (2) possible bad components: 1) Power logic cable OR;
2) Bad thermal (BROWN) fuse S19* (5 Amp).
* To LOCATE fuse S19 refer to
checked by measuring RESISTANCE (Ω) BETWEEN its two terminals. A good fuse
measures less than 0.5 Ω!
No Less than 23.0 volts DC! See procedure number
, measure from the TEST Connector's
Figure 132
2008K/K2 Troubleshooting Guide
P/N 507298 Rev. H
609
, procedure number
pin 7
(three (3) pins from the right).
(page 651)! With the machine off, it can be
P- F.6.0 (page 606).
P- G.0.0.
P- F.5.0
Page 605