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Adjustment Procedures
AM700 Audio Measurement Set Service Manual
5–27
1. Press the Digital front panel button and power on the AM700 to start it with
the Digital application running.
2. Press the Configure button.
3. Touch the Save State soft key.
4. Touch the Set Factory Defaults soft key.
5. Verify that you want to restore the factory defaults.
6. Press Configure again. Touch the Input Select soft key.
7. Set the Input for AES generator.
8. Press Clear Menu.
9. Select the Eye Diagram icon.
10. Press the Menu button.
11. Touch the Interface Timing softkey.
12. Set the Clock Frequency Offset to 10 ppm.
1. Set the DVM to measure DC voltage.
2. Connect the + lead of the DVM to pin 4 of J33. Connect the – lead to pin 1
or pin 10 of J33 (ground) (see Figure 5–7). Check for a voltage of 7 V
to 8 V.
J33
Digital Audio board A3
1
2
3
4
5
6
7
8
9
10
Figure 5–7: Pin arrangement for J33, the PLL voltage test points
3. Adjust L5, Frequency control for U78 in the Frequency Offset circuit, for a
voltage of 7 to 8 V. See Figure 5–8 for the adjustment locations.
4. Connect the + lead of the DVM to pin 5 of J33. Check for a voltage of 7 V
to 8 V.
5. Adjust L7, Frequency control for U79 in the Frequency Offset circuit, for a
voltage of 7 V to 8 V.
6. Connect the + lead of the DVM to pin 2. Check for a voltage of 7 V to 8 V.
Set up the AM700
Adjusting the
Phase-Locked Loops