Veris Technologies MSP EC and pH (1997-2008 CF card drive 1.10M) - Operating Instructions - Manual (Page 50)

Veris Technologies
Pub. #OM MSP03-1
50
Figure 2. External Controller circuit board (metal cover removed)
2. Turn off power to External Controller, remove clear lid and remove and replace any fuse that
has failed.
3. Check voltage with a digital voltmeter at power supply connection
All functions must be engaged during this test. In manual mode turn on wash pumps and cycle
sampler shoe hydraulics while holding voltmeter leads on power supply connector shown in Figure 3.
Keep moisture from entering External Controller. It may be necessary to reposition the spray nozzles
or shield the overspray from the Controller. It is critical that the pumps are under full load (pumping
water through the nozzles) during this test. Be careful to not let your fingers or voltmeter leads touch
any other component inside the External Controller.
Figure 3: Using voltmeter to check voltage at External Controller power supply
POWER (12V)
FUSE 1 (10A)
and its LED
FUSE 2 (250
mA) and its LED