Co- 7.3.4 Isolate Negative (-) 12 Volt Dc Supply - Fresenius Medical Care 2008K2 Troubleshooting Manual

CO- 7.3.4 ISOLATE NEGATIVE (-)12 VOLT DC SUPPLY
Per the Figure below, measure at the TEST Connector's
left). TWO (2) possible scenarios:
1) IF (and ONLY if) between -11.0 and -13.0 volts DC: Swap in the listed components (see
COMPONENT LIST below) one at a time and in between return to (ABOVE) procedure number
CO- 6.2.0 (page 354) to test each component
COMPONENT LIST: 1) Sensor Board; 2) Actuator-Test Board; 3) Functional Board (IC20?);
4) Sensor Board cable; 5) Distribution board.
2) IF NOT between -11.7 and -12.3 volts DC: Proceed to
LEFT BLANK INTENTIONALLY
2008K/K2 Troubleshooting Guide
P/N 507298 Rev. H
-12V
(negative 12V) pin (pin 4, four pins from
page 407
, procedure number CR- 1.0.9.
Page 365