SERVICE MANUAL CHANGE NOTICE
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Shure T2 Vocal Artist Microphone Transmitter<br />
4. Make sure that the receiver’s yellow RF LED lights.<br />
5. Set the receiver’s Volume control to the maximum position (full<br />
clockwise rotation) and apply power to the receiver. On the T4,<br />
set the Squelch control to its midpoint.<br />
6. Measure the rms voltage developed across the unbalanced output<br />
of the receiver. The reading should be approximately 0 dBu<br />
(775 mV), which corresponds to a deviation level of 15 kHz.<br />
Record this voltage as the Deviation Reference Voltage.<br />
Note: At this point you may want to press the Log/Lin button on<br />
the audio analyzer (to measure in dBm) and then press the Ratio<br />
button to perform the relative measurement in the next section.<br />
7. Turn off the RF output from the signal generator.<br />
I: Deviation Adjustment<br />
1. Make sure that C240 is on the RF board, so that the antenna is<br />
connected).<br />
2. Remove the power-supply leads and attach a new 9 V battery.<br />
3. Connect the output of the audio analyzer to the test head.<br />
4. Set the frequency of the audio analyzer to 1 kHz. Make sure that<br />
0 dBu (775 mV) is present at the positive side of C107.<br />
5. Measure the rms voltage at the unbalanced output of the receiver.<br />
Adjust R217 to obtain voltage within ±1 dB of the deviation<br />
reference voltage that you recorded earlier (see the end of the<br />
preceding subsection).<br />
J: Distortion Adjustment<br />
1. Set the audio analyzer for “Distn” (total harmonic distortion).<br />
2. Adjust R130 for minimum distortion out of the receiver (it should<br />
measure less than 1%).<br />
Note: This completes the alignment procedures. Refer to the “Reassembly”<br />
instructions earlier in this manual.<br />
25C1018 (CC)<br />
21 Service Procedures