How do I replace the fuse on my HI 2110WI and HI 2151 series units?

My building was hit by lightning and my Hardy HI 2110WI, HI 2151/20WC and HI 2151/30WC won't power up anymore. I think they were damaged by a power surge. Do these units have a fuse? If so, how do I replace them?

If your Hardy Process Solutions unit is hit by lightning or if you connect your 120VAC instrument to 220VAC by accident, you may have blown a fuse and/or damaged the surge protection components. To determine if you need to replace the fuse or surge protection components on your HI 2110WI, HI 2151/20WC, or a HI 2151/30WC perform the following:

CAUTION: This instrument contains static-sensitive components which require careful handling. Use a static wrist strap for proper grounding protection, or touch a grounded surface just before working on the unit.

REMOVAL AND REPLACEMENT PROCEDURES

CAUTION: Be sure that you follow Electrical Safety and ESD procedures before attempting to work on this unit.

1.DISCONNECT THE INPUT AC POWER to the instrument.

a.For panel mount units; remove all connectors and the 4 retaining screws on the rear panel. The unit will slide out the back of the case extrusion.

b.For wall mount units; the circuit board is already exposed and attached to a back plate.

2.Remove all the connectors.

3.Remove the unit from the enclosure by removing the four corner screws.

4.The aluminum back plate and electronics now will lift out of the enclosure.

5.Gently remove the internal circuitry and place on a non-conductive surface.

6.The Fuse is located directly behind the AC power connector J6 on the Power/Relay card.

7.RV1 and RV2 are located on the Power/Relay card next to the transformer.

8.Use an Ohmmeter to measure across the J6 AC power input.

a.A good reading is approximately 35 ohms ± 5 ohms.

b.An open reading indicates a bad fuse.

c.A shorted RV1 or RV2 will show 5 ohms or less.

9.Remove all circuit boards in the Option slots (if applicable) to gain access to the A/D circuit board. To do this, simply remove the 4 retaining screws and gently pry the circuit board away from the 26-pin connector on the PWA-ANALOG/DIGITAL board. Place the option board on a non-conductive static free surface.

10.Be sure that you are properly grounded and power is removed before removing any components on the circuit board. With a small common flat blade screwdriver, gently pry the ½ amp SLO-B