Dionex AXP/AXP-MS Manual
5.3 Check Valve Cleaning and Replacement
Many check valve problems are the result of small particles interfering
with the operation of the check valve. As a result, most problems can
be solved by pumping a strong solution of liquid laboratory-grade
detergent through the check valves at a rate of 1.00 mL/min for one
hour. After washing with detergent, pump distilled water through the
pump for 15 minutes. Always direct the output directly to a waste
beaker during cleaning. If this does not work, the check valve should
be replaced.
5.4 Lubrication
The Dionex AXP/AXP-MS pump has no lubrication requirements.
The bearings in the pump housing and piston carrier are permanently
lubricated and require no maintenance. Keeping the interior of the
pump free of dirt and dust will extend the pump’s useful life.
5.5 Fuse Replacement
Three fuses protect the Dionex AXP/AXP-MS pump. Two of the fuses
are located in the power entry module at the rear of the cabinet and are
in series with the AC input line. The other fuse is located on the circuit
board and is in series with the 48 VDC supply.
Troubleshooting the fuses is straightforward. If the power cord is
plugged in and the on/off power entry switch is on and the display
does not light, check the two fuses in the power entry module. To gain
access to these fuses, gently pry off the cover plate with a small flat-
bladed screwdriver. Replace with fuses of the correct rating: 1 A slow-
blo fuse.
If the front panel appears to function normally but the pump motor
does not run, check the fuse located on the circuit board. Replace it
with a 5 A fast-blo fuse.
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