Fresenius Medical Care 2008K Troubleshooting Manual page 106

T- 2.0.0 HEATER VOLTAGE LESS THAN 20 VAC - CHECK LOGIC SIGNALS
CAUTION!
DC Voltages will be measured at pins that are close together and 'shorting' them with a
regular meter probe may damage boards. It is HIGHLY RECOMMENDED the Fluke TP 80 meter probe
(or equivalent), together with the protective cap (see
a) IMPORTANT! Post a note that NTC #2 is unplugged. It MUST be returned after the problem is located
and/or before Temperature calibrations but leave it unplugged for now.
b) Open the card cage. Attach a volt meter's ground (black) lead to chassis ground (see
c) Place the machine into Dialysis program (remember to press the 'CONFIRM' key).
d) Referring to Figure 44
(rear) side pins are in two rows. From the rear of the machine, the top row are even numbered pin (2, 4,
etc), the bottom are odd numbered (1, 3, etc).
e) Assuring Dialysate flow in ON (Dialysate Flow on/off LED off), using Fluke TP 80, measure DC voltage
at the solder (rear) side of the pin(s) as specified in
Figure 44 – Electronic Card Cage (Power Logic Board)
Table 16 - Power Logic Heater Signals
PIN
X2 LOCATION
#
Top row, three pins
6
from rear of machine
Bottom row, four pins
7
from rear of machine
Top row, first pin from
2
Rear of machine
(page 104), at the top of the power logic board is the 'X2' connector. The solder
GOOD SIGNAL (Volts DC):
9.6 or greater, measure at pin #7
(next row in this table)
4.0 or greater, measure at pin #2
(next row in this table)
2.0 or lower, if ALL three pins
check okay see procedure number
T- 2.4.0 (page 108)
Fresenius 2008K Troubleshooting Guide
P/N 507298 Rev. B (Draft 1)
Figure 5, page 11) is used!
Table 16 (page 104) and follow the directions given:
BAD SIGNAL (Volts DC):
3.6 or lower, see procedure number
T- 2.1.0
3.0 or lower, see procedure number
T- 2.2.0
9.0 or greater, see procedure
number T- 2.3.0
Section 4 – Temperature Problems
Figure 1, page 3).
(page 105)
(page 106)
(page 106)
Page 104