Service manual

Shure LX2 Hand-Held Transmitter
Service Procedures15
25D1006 (CG)
Change the frequency by changing the crystal on the rf board.
For proper operation, the crystal must be obtained from Shure and must
operate within the frequency range of the pcb. Use the following equa-
tion to determine the operating frequency:
Carrier frequency = 9 x (nominal crystal frequency in MHz) – .09 MHz
After the new crystal is installed, operational tests and alignment pro-
cedures must be performed to ensure that the transmitter is operating
correctly. The pcb label should also be updated to show the new
frequency and letter identification code.
Table 2
Wireless Frequency Selections, Domestic (FCC/IC)
Group
Code
Frequency-
Code
Frequency
(MHz)
Printed Circuit
Board Assembly
V 169.445
AD 169.505
AC 170.245
AH 170.305
AB 171.045
AG 171.105
W 171.845
A
AA 171.905
AZ 174.500
CA 176.200
CC 177.600
CD 180.400
CE 182.200
CF 183.600
CG 186.200
T90__8644
CH 186.600
CJ 189.000
CK 190.600
B
CL 192.200
CM 192.600
CN 195.000
CP 196.600
CS 200.300
CQ 202.200
CR 203.000
C
CT 206.000
CV 208.200
CU 209.000