A2 Control Board Removal

To avoid the possibility of personal injury, remove the power supply from operation before opening the cabinet. Turn off ac power and disconnect the line cord, load, and remote sense leads before attempting any repair or replacement.

When replacing any heatsink-mounted components except thermostat, smear a thin coating of heatsink compound between the component and heatsink. If a mica insulator is used, smear a thin coating of heatsink compound on both sides of the mica insulator.

Do not use any heatsink compound containing silicone, which can migrate and foul electrical contacts elsewhere in the system. An organic zinc oxide cream, such as American Oil and Supply Company Heatsink Compound #100, is recommended.

Most of thc attaching hardware in this unit is metric. The only non-metric (sometimes called English or inch) fittings are listed below. Be careful when both types of screws are removed not to get them mixed up.

a.Screws that secure the input and output capacitors to A1 main board and output bus.

b.Rear-panel circuit breaker.

c.Rear-panel ground binding post.

Top Outside Cover Removal. Remove the two top rear screws using a Size 2, Pozidriv screwdriver. A Phillips head screwdriver does not fully seat into Pozidriv screws and risks stripping the heads. Remove the top cover by sliding it to the rear and lifting at the front.

Bottom Cover Removal. Remove the handles from both sides of the unit and remove the bottom cover by sliding it to the rear. Use a Phillips head #2 screwdriver to remove the handle screws. You do not need to remove the unit's feet.

Inside Top Cover Removal. The unit includes an inside cover which secures the vertical board assemblies. Remove the inside cover for repair but not for calibration. Remove the nine mounting screws (Pozidriv, M4x7) – two in the left side, three on the right side, and four on top. Remove the inside cover by lifting at the front edge.

When installing the inside cover, insert it first at the right side. While holding it tilted up at the left, reach through the cutouts in the cover and fit the top tabs of the A2 control board into the mating slots in the cover. Then repeat the process for the A4 FET board, and the A5 Diode board. Press the inside cover down firmly while tightening screws that secure cover to chassis. Be careful when replacing printed-circuit assemblies and covers not to bend any boards or components.

After removing the inside cover, unplug the W1 ribbon cable at the front edge of the A2 control board and unplug the W7 and W8 ribbon cables from the lower center of the A2 control board. Remove the A2 board by lifting first at the front edge and than pulling it up and out of the unit.

When installing the A2 board, insert it first at the rear of the unit. While holding it tilted up at the front, fit the A2TB1 terminal strip into the mating cutout in the rear panel. Then lower the A2 board's bottom tabs into the mating slots on the chassis. Re-install the W1, W7, and W8 ribbon cables.

A4 FET Board Removal

After removing the inside cover, remove the A4 FET board by lifting, using the large aluminum heatsink as a handle. One connector and one tab holds the A4 board at its bottom edge.

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