P- 1.2.2 Fuses More Than 1.0 Ohm Or "Ol"/Troubleshooting Bad Fuses - Fresenius Medical Care 2008K2 Troubleshooting Manual

P- 1.2.2 FUSES MORE THAN 1.0 Ω OR "OL" / TROUBLESHOOT BAD FUSES
a) Replace the bad 6.3 Amp fuse(s). Call Fresenius Technical Services to ENSURE you are using the
updated fuses!
IMPORTANT!
b) Plug the machine in!
c) Push and hold the Power button for two (2) seconds. Does the machine turn on now (fan running)?
Yes One or both of the fuses were bad.
No Machine DOES NOT turn on! Perform parts A through D below:
IMPORTANT! Unplug the machine!!
A)
B) Measure resistance (Ω) across the fuses again. If one or both are bad then one of the
diodes inside Main Bridge Rectifier (BR1)
1
To LOCATE BR1 refer to
C) Diode check
2
NOTE: All Bridge Rectifier wires must be unplugged before performing a diode
D) If the Bridge Rectifier checks good, or was previously replaced and the fuse(s) continue to
'blow' immediately proceed to
Figure 132
2
or replace the Main Bridge Rectifier (BR1).
The wires are position sensitive!
check.
NOTE where they plug into BEFORE unplugging them!
page 649
LEFT BLANK INTENTIONALLY
2008K/K2 Troubleshooting Guide
P/N 507298 Rev. H
1
may be bad and destroying the fuse(s).
(page 651).
, procedure number
To prevent damage,
.
P- 4.0.0
Page 637