Service manual

Shure LX2 Hand-Held Transmitter
28
Service Procedures
25D1006 (CG)
Distortion Adjustment (Domestic and Euro)
AUDIO ANALYZER
12.5 – 18.9 VDC
ANTANT
OUTPUTS
HI Z
BAL
MIC LINE
POWER
AB
LX4 RECEIVER
TRANSMITTER SHOWN WITH
BATTERY CUP REMOVED, AND
AUDIO TEST HEAD ATTACHED.
–
+
R130
R125
U102
U101
S102
S101
C107
LX2 Transmitter LX4 Receiver Audio Analyzer
Power supply: 9 Vdc Power switch: ON Frequency: 1 kHz
Power switch: PWR Gain: Max Filters:
Mute switch: MUTE Squelch: Mid Low-Pass (30 kHz): ON
High-Pass (400 Hz): ON
Figure 19. Deviation Adjustment Test Set-Up
1. Set the audio analyzer for DISTN (distortion, THD).
2. Adjust R130 for minimum distortion out of the receiver.
System distortion should be less than 1%.