Shure U4D, Руководство по обслуживанию

Страница: 21 / 47

Shure U4D Dual Diversity UHF Receiver
20
25D1062 (AG)
Service Procedures
Alignment
1. Turn the U4D receiver power ON.
2. Connect the U4D receiver antennas.
3. Program the U4D receiver to any clean frequency in the area,
using the SET FREQ menu on the display. To do this, select a
television channel that is inactive in the area, and then scan for
a frequency at which the yellow rf LEDs are not lit. Note this
frequency as Fo.
4. Remove the U4D receiver antennas.
5. Connect the audio analyzer output to the external (EXT)
modulation input of the rf signal generator.
6. Set the audio analyzer output for 1 kHz and 1.4 V (5.2 dBu).
7. Adjust the audio analyzer output amplitude until both the HI EXT
and LO EXT lights on the rf generator turn off (use amplitude
increments of 10 to 100 mV).
8. Make sure all internal tone generators on the rf signal generator
are turned off. Set the rf signal generator deviation as follows:
UA, UB,MA, MB, MC, MD: 45 kHz deviation at 1 kHz modulation
KK: 40 kHz deviation at 1 kHz modulation
II: 28 kHz deviation at 1 kHz modulation
9. Turn ON the 400 Hz high-pass and 30 kHz low-pass filters on
the audio analyzer.
10. Verify that solder jumpers J306 are closed.
11. Set the receiver squelch control to the mid-level (0) position.
12. Slide tone key switch (S201) on the rf–audio board to the
OFF position.