Instruction Manual

245364-V May 2002

Model 755A

If the lamp assembly removed from the instrument has four wires, the 633689 Connector Board requires modification. Continue to step 10.

10.Refer to Figure 6-1 on page 6-4. Remove the two screws holding the Connector Board to the magnet assembly. Carefully remove Connector Board.

11.Place Connector Board on a clean working surface, with solder side (no components) up.

12.Per Figure 6-4 below, add straps or solder bridges at the two points shown.

NOTE

If the Connector Board cannot be satisfactorily modified, a modified 633689 Connector Board may be ordered from the factory. See Section 7.

13.Reassemble detector, etc., in reverse order of disassembly.

14.Refer to Figure 6-5 below. The red line on the lamp must be aligned with the retaining set screw. Insert lamp into mounting hole until it extends 1/4 inch. Tighten set screw.

15.Realign the photocell per Section 1-1a on page 6-7.

Add Straps or Solder Bridges

F3

HR1

Solder Side of Board (Backside)

Figure 6-4. Modification of 633689 Connector Board for Compatibility with Replacement Lamp

1/4"

Set Screw

Red Mark for

Alignment

Figure 6-5. Lamp Alignment

6-6

Service and Maintenance

Rosemount Analytical Inc. A Division of Emerson Process Management