HP E42 manual Removal and Replacement Instructions, Instrument Cover Removal

Model 5328A

Maintenance

5-54.REMOVAL AND REPLACEMENT INSTRUCTIONS

5-55. Removal and replacement instructions are provided for the instrument cover, the time interval module (assemblies A10 and A19) and A16 Display Assembly.

5-56.Instrument Cover Removal

5-57. To remove top or bottom cover, remove the screw at the rear edge that secures cover to instrument. Slide cover toward rear of instrument and lift off. To replace cover, reverse procedure.

WARNING

115 OR 230 VAC SUPPLY WIRES ARE EXPOSED WHEN EITHER TOP OR BOTTOM COVER IS REMOVED. USE EXTREME CAUTION DURING TROUBLESHOOTING, ADJUSTMENT, OR REPAIR. AVOID DAMAGE TO INSTRUMENT BY REMOVING POWER BEFORE REMOVING OR REPLACING COVERS, ASSEMBLIES, OR COMPONENTS.

5-58.Time Interval Module (Assemblies A10 and A19) Removal Replacement

5-59. To remove and replace the time interval module, proceed as follows:

a.Disconnect the power cable from the 5328A (Safety Precaution).

b.Remove rear feet and the top cover from the 5328A.

c.Using a suitable flat-blade screwdriver as a prying tool, gently remove the plastic filler strip from the top of the cast front-panel frame.

d.Remove the two machine screws that secure the top of the module front panel to the top of the cast front-panel frame.

e.Turn the 5328A on its side and remove the two machine screws that secure the bottom of the module front panel to the bottom of the cast front-panel frame.

f.Slightly loosen all remaining machine screws along the top of the cast front-panel frame. This releases the compressive force on the module front panel.

g.Remove front panel nuts from A and B channel input connectors.

h.Remove the A19 Switch Board with front panel attached, by gently pushing the assembly from the rear. Note that the A19 board is separate from the A10 Synchronizer Assembly during this operation.

i.Remove the front panel from A19 by removing the MARKER OUTPUT connector nuts and removing the LEVEL A and B control knobs.

j.Remove the A10 Synchronizer Assembly by pulling the assembly upward.

k.Replacement is essentially the reverse of removal.

5-60Display Assembly Removal and Replacement

5-61. To remove and replace the A16 Display Assembly, proceed as follows:

a. Disconnect the power cable from the 5328A (Safety Precaution).

b. Remove the top cover from the 5328A.

c. Using a suitable flat-blade screwdriver as a prying tool, gently remove the plastic filler strip from the top of the cast front-panel frame.

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