Instruction manual

Chapter 4 Retrofitting Options
To Retrofit A6 High Stability Timebase Assembly (Options 001, 010, and
012)
4-12 Assembly-Level Service Guide
4
Procedure
1 Turn off the Counter and remove power cord.
2 Remove the cover.
See the section titled “To Remove the Cover” in Chapter 3 of this guide.
3 If you are retrofitting the Option 010 High Stability or Option 012
Ultra-High Stability assembly, go to step 4 below.
If you are retrofitting the Option 001 Medium Stability Timebase
Assembly: Place the oscillator over the outline area of the circuit board
and note which holes align with the pins on the bottom side of the
oscillator. Use a soldering iron and solder sucker to remove the solder
from those holes. Place the oscillator onto the circuit board, with the pins
extending through the corresponding holes such that the main body of the
oscillator is on the same side as other mounted components. Solder the
oscillator in place. Skip step 4 and go to step 5.
4 Plug 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.
5 If 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.
6 Mount A6 High Stability Timebase Assembly on the left side using
three TORX 10 screws (H1) as shown in Figure 4-2.
7 Plug 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).