Section 17 - Checking The Sensor Board Cable - Fresenius Medical Care 2008K2 Troubleshooting Manual

SECTION 17 - CHECKING THE SENSOR BOARD CABLE

The 34-conductor Sensor Board cable runs between the distribution board and the Sensor Board. Check
ONLY the NOTED component connection(s)!
a) Per the Figure (below), this procedure checks the cable by measuring conductor resistance (Ω) from one
end (distribution board) to the other (Sensor Board). Good conductors measure 2 Ω or less.
IMPORTANT!
b) Turn the machine OFF to prevent damage! Open the card cage.
c) Check the cable's entire length (distribution board to Sensor Board) for bare wires or other damage.
d) Per the Figure above, unplug the cable from the distribution board's SENSORS connector. Check inside
the vacant SENSORS connector for 'white' corrosion or damaged male pins. Damage ANYWHERE may
be the problem!
e) To determine your ohm (Ω) meter's internal resistance touch the leads together. The meter MUST read
less than 1 Ω! Subtract the reading from ALL subsequent measurements.
f) Per the Figure below, the cable's female connector has two rows of PLUGS. Hold it with its KEY TAB
towards the floor. This puts the even numbered PLUGS in the top row, odd numbered in the bottom row
AND the 'Rear of Machine' is towards the right.
Figure 93 – Female Distribution Board Connector
g) Referring to Table 14
h) A meter probe will not penetrate deep enough and a paper clip may
cause damage! INSTEAD, use 25 gauge non-stranded wire as a
'probe'. Referring to the Figure (right), insert the 'probe' into the
appropriate PLUG then place (or clip) one of the meters leads onto the
'probe'.
Parts i and j next page
(page 525), LOCATE the appropriate PLUGS for the NOTED component.
2008K/K2 Troubleshooting Guide
P/N 507298 Rev. H
Page 524