Chapter 3 Replacing Assemblies

To Remove A1 Motherboard Assembly

To Remove A1 Motherboard Assembly

1Remove the cover.

See the section titled “To Remove the Cover” in this chapter.

2Remove the Power Supply Assembly.

See the section titled “To Remove A4 AC Power Supply Assembly” in this chapter.

3Remove the front bezel.

See the section titled “To Remove the Front Bezel” in this chapter.

4If the Counter contains Option 015/030/050/124 1.5/3.0/5.0/12.4 GHz Channel, disconnect the optional channel’s flat-ribbon cable from J7 on A1 Motherboard Assembly as shown in Figure 3-6.

5If the Counter contains one of the optional high stability timebase assemblies (Option 001, 010, 012), disconnect the flat-ribbon cable from J6 of A1 Motherboard as shown in Figure 2-8A

(See Chapter 2, “Service.”).

6If the Counter contains the Option 002 DC Power Input Assembly, remove it.

See the section titled “To Remove A5 DC Power Input Assembly (Option 002)” in this chapter.

7Remove the two hex screws (H4), shown in Figure 3-6, on the rear-panel HP-IB connector using the 7-mm spin tight.

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Assembly-Level Service Guide

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HP 181A manual To Remove A1 Motherboard Assembly