Shure U4D Service Manual page 29

Second Mixer Coil Adjustment (Channel B)
DC VOLTMETER
25D1062 (AG)
Shure U4D Dual Diversity UHF Receiver
NOTE: DC VOLTAGES ARE PRESENT
AT MOST RF TEST POINTS. USE A DC
BLOCK ON THE RF SIGNAL GENERATOR
TO PROTECT TEST EQUIPMENT.
ANTENNA A IN
S201
(OFF)
P202
P203
U313 / U316
PIN 8 / PIN 17
J302
Figure 12. Channel B Second Mixer Coil Adjustment Connections
1. Change the rf input level to –105 dBm.
2. Adjust L324 for maximum dc voltage at U313 pin 8 for PCB
version 34A8507 or at U316 pin 17 for PCB version 34A8703.
28
RF SIGNAL GENERATOR
S201
(OFF)
P202
P203
L324
Service Procedures
DC BLOCK
ANTENNA B IN
P202 P202