Shure U4D - Second Mixer Coil Alignment (Channel A)

Shure U4D Dual Diversity UHF Receiver
24
25D1062 (AG)
Service Procedures
Second Mixer Coil Alignment (Channel A)
L313
P202P202
P203
S201
RF SIGNAL GENERATOR
ANTENNA A IN
P202
P202
P203
S201
ANTENNA B IN
U303 / U315
DC VOLTMETER
PIN 8 / PIN 17
DC BLOCK
NOTE: DC VOLTAGES ARE PRESENT
AT MOST RF TEST POINTS. USE A DC
BLOCK ON THE RF SIGNAL GENERATOR
TO PROTECT TEST EQUIPMENT.
(OFF)
(OFF)
J302
Figure 8. Channel A Second Mixer Coil Alignment
1. Change the rf input level to –105 dBm.
2. Adjust L313 for maximum dc voltage at U303 pin 8 for PCB ver-
sion 34A8507 or at U315 pin 17 for PCB version 34A8703.