HP E42 manual Model 5328A Maintenance Adjustment of A3 Oscillator Support, Troubleshooting

Model 5328A

Maintenance

5-26.Adjustment of A3 Oscillator Support

1. Connect 5328A, HP 8640, and HP 180 as shown in Figure 5-4.

Figure 5-4.Hookup For A3 Oscillator Support Adjustment

2.Place A3 on an extender board,

3.Apply a 1 MHz signal at a level greater than 1V rms to the 5328A rear-panel EXT OSC IN.

4.With scope probe, monitor A3U2 (6) non-component side of A3 circuit board.

5.Adjust A3C15 and A3C12 to minimize side-jitter in trace, as shown in Figure 5--5.

6.Put the scope in X10 and fine-tune the adjustments for minimum jitter.

5 - 2 7 . T R O U B L E S H O O T I N G

5-28. Trouble isolation can best be accomplished by obtaining all possible information from the controls, connectors, and indicators on the 5328A. This information should then be analyzed by conducting the Performance Test (Table 5-4) to aid in determining symptoms of the trouble. Troubleshooting aids are described in the following paragraphs,

5 - 29 . TROUBLESHOOTING AIDS

5-30. Troubleshooting flowcharts for each assembly of the 5328A are provided at the back of this section. Extender boards and test cards are available as service kits. This section contains a table for analysis of functional signals and a table for IC troubleshooting.

5-31.Extender Board (05328-62016)

5-32. Two of these extender boards are supplied with the 5328A to extend the A4 Function Selector Assembly or the A8 Frequency C Assembly. One of these extender boards is required to extend the A10 assembly for the standard 5328A.

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