5. Electronics
5.7 I/O HYDRAULICS POWER BOARD
This board is controlled directly by the Input/Output Controller
board. The I/O Hydraulics Power board in turn controls the
operation of the following analog devices related mostly to the
fluid path system (see Figures 5-1 and 5-18):
• W/A Level Sensor
• Dialyzer (Rinse) Connector Sensor
• Concentrate Connector Sensor
• Dialysate Flow Sensor
• Hour meter
• Blood Leak Detector
• Dialysate Pressure Transducer
• Conductivity-Temperature monitoring
• Incoming water, Recirculation and Bypass Valves
• OLHDF Purge Valve # 1 (optional)
• Powder Bicarbonate Air Trap Valve and level Sensor,
Prime Valves and Cartridge Holder Reed Switch (optional)
Figure 5-21 shows the location of major components, fuses
(green), LEDs (red) and test points (blue).
5.7.1 Fuses
Table 5-8 lists fuses with their part numbers and usage. Fuses may
be continuity tested out of circuit with an ohm meter. Spare fuses
may be packaged in a special holder for added protection. Fuses
must be removed from that holder before use.
Fuses may be removed from the board by grasping them in the
center with small needle-nose pliers.
Caution
Do not remove fuse from or insert fuses into the Hydraulics
Power board while power is applied to the board.
Table 5-8. Hydraulics Power Board Fuses
Fuse Fuse Circuit Part No Rating
F1 +12 VDC Supply 6001276129 0.25 A
F2 +5 VDC Supply 6001276130 0.50 A
F3 -12 VDC Supply 6001276129 0.25 A
F4 +24 VDC Supply 6001276132 10 A
F5 Flow Sensor #1 6001276129 0.25 A
157-1278-912 Rev A 5-35
November 2003
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