P- 2.0.6 Isolate 24 Volt Switch - Fresenius Medical Care 2008K2 Troubleshooting Manual

P- 2.0.6 ISOLATE 24 VOLT SWITCH

IMPORTANT! Turn the machine OFF!
a)
b) Per the Figure previous page,
Logic Board's X2 connector,
c) Looking for pin 1 to fall below 1.0 volts AT LEAST ONE (1) TIME,
FROM THE METER
d) TWO (2) possible scenarios:
1) IF (and ONLY if) pin 1 NEVER, EVER drops to less than 1.0 volt i.e. REMAINS ALWAYS
more than 10.0 volts! Repeat procedure P- 2.0.6 just to be sure. If pin 1 still never drops to less
than 1.0 volts see procedure number
2) IF pin 1, at least once, drops to less than 1.0 volt: If System Initialization does reach 100%,
TWO (2) possibilities: 1) Bad 24 volt switch (IC4)* on the Power Control Board (inside the power
supply) OR; 2) Bad thermal (BROWN) fuse S18*
* To LOCATE IC4 and fuse S18 refer to
TIGHTLY HOLD
pin 1
(bottom row, first pin from the REAR of the machine).
, turn the machine ON (fan running) and watch for thirty (30) seconds!
P- 2.0.7
LEFT BLANK INTENTIONALLY
2008K/K2 Troubleshooting Guide
P/N 507298 Rev. H
the meter lead at the solder (rear) side of Power
WITHOUT LOOKING AWAY
(page 645).
Figure 132, (page 651)
Page 644