P- F.4.0 Both +12 And +5 Vdc Low/Isolate 24 Volts Dc At Power Logic Board - Fresenius Medical Care 2008K2 Troubleshooting Manual

P- F.4.0 BOTH +12 AND +5 VDC LOW / ISOLATE 24 VOLTS DC AT POWER LOGIC BOARD
IMPORTANT!
a) ENSURE the machine is on (fan running)!
CAUTION!
b) DC voltages (V
touching pins together WILL CAUSE DAMAGE! As directed in the Figure below, make your RED meter
lead a PROTECTED lead!
IMPORTANT!
c) ENSURE the meter's black lead REMAINS connected to chassis ground!
d) Figure below, at the top edge of the Power Logic Board, closest to the screen, locate its 20-pin X2 ribbon
cable.
e) TWO (2) measurements at the rear side of the X2 cable:
MEASUREMENT #1: At pin 12 (TOP row, 6 pins from the REAR of machine)
MEASUREMENT #2: At pin 11 (BOTTOM row, 6 pins from the REAR of machine)
f) Are BOTH measurements more than 23.0 volts DC?
) are about to be measured at pins that are VERY close to others and
DC
DO NOT CONTINUE UNTIL YOU HAVE DONE THIS!
Figure 115 – Power Logic Board Pins 11/ 12 / 13
2008K/K2 Troubleshooting Guide
P/N 507298 Rev. H
Page 604