4

Chapter 4 Retrofitting Options

To Retrofit A6 High Stability Timebase Assembly (Options 001, 010, and

012)

Procedure

1Turn off the Counter and remove power cord.

2Remove the cover.

See the section titled “To Remove the Cover” in Chapter 3 of this guide.

3If you are retrofitting the Option 001 Medium Stability Timebase Assembly, go to step 5.

If you are retrofitting the Option 010 High Stability or Option 012 Ultra-High Stability assembly, go to step 4 (the next step).

4Plug the oven oscillator into the socket on A6 Timebase Support Board, and secure the oven oscillator to A6 using the two Pozidriv screws (H7) as shown in Figure 4-2.

5Plug the oven oscillator into the socket on A6 Timebase Support Board, and secure the oven oscillator to A6 using the two Pozidriv screws (H7) as shown in Figure 4-2.

6If you are retrofitting the Option 001 Medium Stability Timebase, remove the jumper cap on P1 of A6 Timebase Support Board as shown in Figure 4-2.

If you are retrofitting the Option 010 High Stability and Option 012 Ultra-High Stability timebases, DO NOT remove the jumper cap on P1.

7Mount A6 High Stability Timebase Assembly on the left side using three TORX 10 screws (H1) as shown in Figure 4-2.

8Plug the power supply assembly’s two-wire cable into the three-prong connector (J2) on the high stability timebase assembly as shown in Figure 4-2 (if the two-wire cable exists).

9Connect A6 High Stability Timebase Assembly cable to connector J9 on A1 Motherboard Assembly as shown in Figure 4-2.

4-12

Assembly-Level Service Guide

Page 184
Image 184
HP 181A manual Turn off the Counter and remove power cord Remove the cover