Shure U2 Hand-Held UHF Transmitter
Service Procedures 25B1022 (AG)18
Tone Key Level Adjustment
1. Use a dc power supply to apply 2.5 ± 0.01 Vdc to the
battery terminals.
2. No audio is applied to the audio input.
3. Do not use filters on the measuring instrument.
4. The tone key frequency will be approximately 32.768 kHz.
5. Adjust R286 so that a tone key level of -22.8 ±0.1 dBu (56 mV)
is measured at pin 1 of U204. For JB models, this level is
–24.7dBu ±0.1 dBu (45 mV).
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