Shure LX1 Service Manual

Shure LX4 Diversity Receiver
Service Procedures1325D1008 (BK)
Service Procedures
Test Equipment
Most test equipment needed is described in the Shure Wireless
Service Equipment Manual. The following test equipment (or approved
equivalent) is also needed.
Table 1
Test Equipment
Equipment Type Model
Audio analyzer *Hewlett-Packard 8903B
Digital multimeter Fluke 87
Rf signal generator Hewlett-Packard 8656B
Frequency counter Hewlett-Packard 53181A
Spectrum analyzer Hewlett-Packard 8590L
*Audio levels in dBu are marked as dBm on the HP8903B.
Changing the Frequency
System Operating Frequencies
The LX4 Diversity Receiver printed circuit board is marked with
a group letter that identifies the range of frequencies the receiver can
operate within.
The operating frequency may be changed to a different frequency
within the same group. Before changing the operating frequency, refer
to the Functional Test section and check the receiver for proper opera-
tion.
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 pc board. Use the following
equation to determine the operating frequency:
Carrier frequency = 3 x (nominal crystal frequency in MHz) + 10.71 MHz
After the new crystal is installed, operational tests and alignment pro-
cedures must be performed to ensure that the receiver is operating cor-
rectly. The pcb label should also be updated to show the new frequency
and letter identification code.

Shure LX1 Specifications

General

Brand	Shure
Model	LX1
Category	Receiver
Language	English