Service manual

Shure LX2 Hand-Held Transmitter

Service Procedures17

25D1006 (CG)

Alignment

AUDIO ANALYZER

–

RF BOARD (TOP)

L209

R217

Y201

C217

C216

C240

J102

J101

I210

I2GN

NOTE: Whenever soldering is performed on the

curcuit boards, always power off the unit.

LX2 Transmitter Audio Analyzer

Power supply: 9 Vdc Filters:

Power switch: PWR 400 Hz High-Pass: ON

Mic switch: MUTE 30 kHz Low-Pass: ON

Gain: Mid

Figure 8. Rf Alignment Test Set-Up (Domestic)

S The alignment procedure is sequential and does not change,

unless specified.

S Use RG58 or any other low-loss, 50 Ω test cables for all rf

connections.

S Keep the test cables as short as possible.

S Include the insertion loss of the cables and the connectors

for all rf measurements.

S Dc voltages are present at most rf test points. Use dc blocks

to protect the test equipment, if necessary.

1. Connect a 9 Vdc power supply to the battery terminals.

2. Make sure the mic ON/MUTE switch is in the MUTE position.

3. Set the audio gain potentiometer (R125) at mid-range.

4. Activate the 400 Hz high-pass and 30 kHz low-pass filters

on the audio analyzer.